The best roof underlayment overall in this roundup is DuPont Roof Protector, a broad-coverage synthetic option for buyers who want a practical balance of coverage and handling. For self-adhering protection, Grip-Rite ShingleLayment High-Temperature is a standout; for large standard-underlayment jobs, Grip-Rite ShingleLayment-LWE offers a full-width synthetic roll. The main choice is between synthetic rolls for broad coverage and self-adhering membranes for targeted waterproofing, with roof design, installation conditions, and required code compliance shaping the decision. Roll dimensions and product specifications vary, so compare the exact label and installation instructions before buying. Continue reading for the full breakdown and a guide to matching underlayment to your roof.
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Key Takeaways
- DuPont Roof Protector offers the broadest listed roll coverage in the lineup at 42 inches by 286 feet, while most synthetic alternatives are 4 feet by 250 feet; check the actual roof area and overlap needs before comparing roll counts.
- Grip-Rite ShingleLayment High-Temperature is the distinct self-adhering choice for heat-exposed applications, while the Grip-Rite LWE and most other wide rolls are synthetic underlayments with different installation requirements.
- The four MYOYAY and GOOFCXO listings are compact membrane rolls, not like-for-like substitutes for 1,000-square-foot synthetic rolls; their listed lengths make them better suited to smaller coverage needs or targeted areas.
- The 48-inch synthetic rolls dominate the lineup, including Zeluga, BlackKnight, ArmorLay 25, Interwrap UDL25, APX, and SIPA, so differences in product instructions, specifications, and compatibility matter more than width alone.
- A roll’s stated dimensions do not establish suitability for every roof: roof pitch, exposure duration, climate, local code, and shingle or metal-roof manufacturer requirements should determine the final pick.
| MYOYAY Self-Adhesive Waterproofing Roofing Membrane, 39 in x 16.4 ft, Gray |  | Best for Small Repairs | Material: Rubber with aluminum foil layer | Roll size: 39 in x 16.4 ft | Dimensions: 196.8 x 39 x 0.06 inches | VIEW LATEST PRICE | See Our Full Breakdown |
| ZIP System Peel and Stick Roof Underlayment, Standard Temperature |  | Best for ZIP System Roof Decks | Manufacturer: Huber Engineered Woods | Material: Rubberized asphalt | Model: Standard Temp | VIEW LATEST PRICE | See Our Full Breakdown |
| Grip-Rite ShingleLayment High-Temperature Self-Adhering Roofing Underlayment, 36 in. x 67 ft. |  | Best High-Temperature Self-Adhering Pick | Material: Polypropylene | Model: SL2SQHT | Size: 36 in. x 67 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| MYOYAY Self-Adhesive Waterproofing Roofing Membrane, 39 in x 16.4 ft, White |  | Best White Reflective Repair Membrane | Material: Rubber with aluminum foil layer | Roll size: 39 in x 16.4 ft | Dimensions: 196.8 x 39 x 0.06 inches | VIEW LATEST PRICE | See Our Full Breakdown |
| Grip-Rite ShingleLayment-LWE Synthetic Roofing Underlayment, 4 ft. x 250 ft. |  | Best for Large Roof Decks | Material: Woven polypropylene | Model: SL154250LWE | Dimensions: 4 ft. x 250 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| MYOYAY Self-Adhesive Waterproof Roofing Roll, 39 in. × 32.8 ft., White | | Best for Targeted Roof Repairs | Material: Rubber membrane with aluminum foil layer | Roll size: 39 in. × 32.8 ft. | Dimensions: 393 × 39 × 0.06 in. | VIEW LATEST PRICE | See Our Full Breakdown |
| Zeluga 32-390 Synthetic Roofing Underlayment, 48 in. x 250 ft., 1,000 sq. ft. |  | Best for Longer Open-Deck Exposure | Manufacturer: Zeluga | Model: 32-390 | Roll size: 48 in. × 250 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| BlackKnight Professional Grade Synthetic Roofing Underlayment, 4 ft x 250 ft |  | Best Installation Package | Manufacturer: BlackKnight | Part number: AM-BK-SRU4250 | Roll size: 4 ft. × 250 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| ArmorLay 25 Synthetic Roof Underlayment, 4 ft x 250 ft |  | Best for Short-Window Coverage | Coverage: 1,000 sq. ft. | Roll size: 4 ft. × 250 ft. | Material: Polyvinyl chloride (PVC) | VIEW LATEST PRICE | See Our Full Breakdown |
| Interwrap UDL25 Roof Underlayment, 48 in x 250 ft |  | Best for Mixed Roofing Materials | Brand: Interwrap | Model: UDL25 | Roll size: 48 in. × 250 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| APX Synthetic Roof Underlayment Roll, 48 in x 250 ft |  | Best for Multi-Material Roofs | Dimensions: 48 in x 250 ft | Coverage: 1,000 sq ft | Material: Polypropylene, four-layer construction | VIEW LATEST PRICE | See Our Full Breakdown |
| GOOFCXO Self-Adhesive Waterproof Roofing Membrane Roll, 39 in x 16.4 ft |  | Best for Small Repairs | Dimensions: 39 in x 16.4 ft | Material: Polyethylene sheet, geotextile fabric, polymer adhesive film | Installation: Self-adhesive; no heating device required | VIEW LATEST PRICE | See Our Full Breakdown |
| SIPA 100 GSM Synthetic Waterproof Roof Underlayment, 48 in x 250 ft |  | Best for Standard Shingle and Metal Jobs | Dimensions: 48 in x 250 ft | Coverage: 1,000 sq ft | Weight: 21.1 lbs | VIEW LATEST PRICE | See Our Full Breakdown |
| DuPont Roof Protector Roofing Underlayment Roll, 42 in × 286 ft |  | Best for Steep-Slope Shingle Roofs | Roll width: 42 in (3.5 ft) | Roll length: 286 ft | Roll coverage: 10 squares | VIEW LATEST PRICE | See Our Full Breakdown |
| roof underlayment | Material | Weight | Dimensions | Roll size |
|---|---|---|---|---|
| MYOYAY Self-Adhesive Waterproo | Rubber with aluminum foil layer | 6.4 pounds | 196.8 x 39 x 0.06 inches | 39 in x 16.4 ft |
| ZIP System Peel and Stick Roof | Rubberized asphalt | 51 pounds | 10 x 10 x 38 inches | — |
| Grip-Rite ShingleLayment High- | Polypropylene | 28 pounds | — | — |
| MYOYAY Self-Adhesive Waterproo | Rubber with aluminum foil layer | 7.15 pounds | 196.8 x 39 x 0.06 inches | 39 in x 16.4 ft |
| Grip-Rite ShingleLayment-LWE S | Woven polypropylene | 18.5 pounds | 4 ft. x 250 ft. | — |
| MYOYAY Self-Adhesive Waterproo | Rubber membrane with aluminum foil layer | 12.19 lb | 393 × 39 × 0.06 in. | 39 in. × 32.8 ft. |
| Zeluga 32-390 Synthetic Roofin | Woven polypropylene | 18.56 lb | — | 48 in. × 250 ft. |
| BlackKnight Professional Grade | — | 23.6 lb | — | 4 ft. × 250 ft. |
| ArmorLay 25 Synthetic Roof Und | Polyvinyl chloride (PVC) | — | — | 4 ft. × 250 ft. |
| Interwrap UDL25 Roof Underlaym | Plastic | — | — | 48 in. × 250 ft. |
| APX Synthetic Roof Underlaymen | Polypropylene, four-layer construction | 18.36 lbs | 48 in x 250 ft | — |
| GOOFCXO Self-Adhesive Waterpro | Polyethylene sheet, geotextile fabric, polymer adhesive film | — | 39 in x 16.4 ft | — |
| SIPA 100 GSM Synthetic Waterpr | Non-woven polypropylene laminated with polyethylene and UV- and water-resistant adhesive | 21.1 lbs | 48 in x 250 ft | — |
| DuPont Roof Protector Roofing | Woven polypropylene scrim | 19 lb | — | — |
More Details on Our Top Picks
MYOYAY Self-Adhesive Waterproofing Roofing Membrane, 39 in x 16.4 ft, Gray
For localized sealing work, this MYOYAY membrane is easier to size and handle than a full-deck roll such as the Grip-Rite ShingleLayment-LWE, which covers 1,000 square feet. Its 39-inch width and 16.4-foot length give you material for targeted patches, transitions, or small outdoor roofing areas without managing a long roll. The self-adhesive rubber backing avoids separate adhesive, and the aluminum foil layer is intended to reflect heat. Those features make it a practical patching option, not a substitute for a specified underlayment system across a complete roof. You’ll need a clean surface and firm pressure for adhesion, and the seams must overlap to limit water entry. Product data also provides less evidence of defined roof-system performance than the ZIP System underlayment.
Pros:- Self-adhesive backing supports installation without separate adhesive
- Can be cut to fit localized repairs and irregular sections
- Aluminum foil layer is designed to reflect heat
- Flexible rubber membrane is intended for weather resistance
Cons:- A 16.4-foot roll is impractical for broad roof-deck coverage
- Surface must be clean and firmly pressed for adhesion
- Overlapping seams are needed to help limit water penetration
Best for: DIYers sealing a small roof section or repairing a localized area who want a cut-to-size, self-adhesive membrane.
Not ideal for: Roofers covering a full deck or buyers who need documented system compatibility and defined performance criteria; the roll is short and the supplied data does not establish those qualifications.
- Material:Rubber with aluminum foil layer
- Roll size:39 in x 16.4 ft
- Dimensions:196.8 x 39 x 0.06 inches
- Weight:6.4 pounds
- Color:Gray
- Installation:Self-adhesive; cut to size
- Model number:USY7-40893
Our verdict“Choose this gray MYOYAY roll for cut-to-size patching and small jobs, not as your primary full-roof underlayment.”
ZIP System Peel and Stick Roof Underlayment, Standard Temperature
System compatibility is the reason to choose this underlayment. Its rubberized asphalt layer is designed to create both a water barrier and a nail-seal membrane, making it a more clearly specified roof-deck option than the short MYOYAY repair rolls. The slip-resistant surface can help with footing during installation, while the stated use includes eaves and valleys as well as broader deck coverage. The 30-year ZIP System Leak-Free Guarantee applies only when this product is installed with ZIP System sheathing and tape, so it should not be treated as a general guarantee for mixed components. Compared with Grip-Rite ShingleLayment High-Temperature, ZIP System’s selling point is its compatible system pathway, not a stated high-temperature rating or 180-day exposure window. Buyers outside the ZIP ecosystem should weigh that limitation carefully.
Pros:- Rubberized asphalt is designed to provide a water barrier and nail-seal membrane
- Self-adhesive format is suited to roof-deck application
- Slip-resistant surface supports installation traction
- Specified for roof decks, including eaves and valleys
Cons:- The 30-year guarantee requires ZIP System sheathing and tape
- Standard-temperature model may not suit projects requiring a high-temperature underlayment
- Product data does not state a temporary UV-exposure duration
Best for: Builders using ZIP System sheathing and tape who want a peel-and-stick membrane with a nail-seal function for roof decks, eaves, and valleys.
Not ideal for: Roofers assembling a different brand’s roof system or buyers seeking a stated high-temperature product or a listed temporary UV-exposure period.
- Manufacturer:Huber Engineered Woods
- Material:Rubberized asphalt
- Model:Standard Temp
- Part number:S-20036
- Weight:51 pounds
- Dimensions:10 x 10 x 38 inches
- Application:Roof decks, including eaves and valleys
- Guarantee condition:30-year ZIP System Leak-Free Guarantee when installed with ZIP System sheathing and tape
Our verdict“Pick ZIP System when you are building with its matching sheathing and tape; for other assemblies, its guarantee advantage does not apply.”
Grip-Rite ShingleLayment High-Temperature Self-Adhering Roofing Underlayment, 36 in. x 67 ft.
Choose this Grip-Rite model when temperature rating matters and you want a self-adhering membrane rather than a mechanically fastened synthetic sheet. Its polypropylene construction, self-sealing design, and stated high-temperature size make it a more targeted choice than the Standard Temp ZIP System underlayment. The slip-resistant top and base can make handling more manageable, while up to 180 days of UV exposure gives a roofing project some flexibility before the finished covering goes on. That exposure period is temporary, not permission to leave the roof uncovered indefinitely. At 201 square feet, this roll covers far less area than Grip-Rite ShingleLayment-LWE’s 1,000-square-foot roll, so it better fits focused areas or smaller projects than full-deck work. Confirm that the product suits your roof assembly before installation.
Pros:- High-temperature designation suits projects where a standard-temperature membrane may not fit
- Self-adhering and self-sealing design supports a continuous protective layer
- Slip-resistant surfaces aid handling during installation
- Up to 180 days of stated temporary UV exposure
Cons:- 201-square-foot coverage is limited for large roof decks
- UV exposure is temporary and capped at 180 days
- The supplied product data does not state a specific roof-system guarantee
Best for: Roofers handling smaller high-temperature roof areas who want a self-adhering, self-sealing membrane with slip-resistant surfaces.
Not ideal for: Crews covering large roof decks with one roll or projects that may remain exposed beyond the stated 180-day temporary window.
- Material:Polypropylene
- Model:SL2SQHT
- Size:36 in. x 67 ft.
- Coverage:201 sq. ft.
- Weight:28 pounds
- Color:White
- Temperature designation:High Temperature
- UV exposure:Up to 180 days
Our verdict“This Grip-Rite roll suits smaller high-temperature applications, while the larger ShingleLayment-LWE is a better fit for broad synthetic coverage.”
MYOYAY Self-Adhesive Waterproofing Roofing Membrane, 39 in x 16.4 ft, White
The white finish is this MYOYAY roll’s main distinction from its gray sibling: both share the same 39-inch-by-16.4-foot format, rubber-and-foil construction, and self-adhesive approach, while this version is described for a range of surfaces including metal, wood, concrete, and tile. The aluminum foil layer is intended to reflect heat, and the material can be cut for localized sealing. That flexibility makes it more appropriate for small repairs or varied outdoor surfaces than the full-deck Grip-Rite ShingleLayment-LWE. The tradeoff is limited coverage and a product description that does not provide independent durability or performance evidence. As with the gray MYOYAY, clean preparation, firm pressing, and careful seam overlap matter; it is not the strongest choice when a documented roof-system specification is the priority.
Pros:- White finish distinguishes it from the gray MYOYAY version
- Self-adhesive rubber backing can be cut to fit small areas
- Aluminum foil layer is designed for heat reflection
- Described for use across several building surfaces
Cons:- Short roll is not suited to covering a full roof deck
- Requires a clean surface and firm pressure during installation
- Product description provides no independent durability or performance evidence
Best for: DIYers sealing a small area on a white or light-colored roof surface who need a cuttable self-adhesive membrane for materials such as metal, wood, concrete, or tile.
Not ideal for: Contractors seeking full-deck coverage or buyers who require independently documented durability and roof-system performance.
- Material:Rubber with aluminum foil layer
- Roll size:39 in x 16.4 ft
- Dimensions:196.8 x 39 x 0.06 inches
- Weight:7.15 pounds
- Color:White
- Manufacturer:MYOYAY
- Model:USY7-40966
- Installation:Self-adhesive; cut to size
Our verdict“Choose the white MYOYAY for small, mixed-surface sealing jobs where its finish and cut-to-size format are useful.”
Grip-Rite ShingleLayment-LWE Synthetic Roofing Underlayment, 4 ft. x 250 ft.
For broad roof coverage, this is the most practical format in this group. The 4-by-250-foot woven polypropylene roll covers 1,000 square feet, avoiding the repeated handling and seams of the smaller Grip-Rite High-Temperature roll or either MYOYAY membrane. Rather than a peel-and-stick layer, it is a synthetic, water-shedding underlayment with placement guides to help align installation and fastening. Its slip-resistant top and base, plus resistance to tearing, cracking, and moisture, are aimed at smoother work across larger decks. The compromise is that it is not described as a self-adhering or nail-sealing membrane, so it serves a different installation need than ZIP System. Its UV treatment allows up to 180 days of temporary exposure, but the roof still needs its finished covering within that window.
Pros:- 1,000-square-foot coverage suits broad roof-deck projects
- Woven polypropylene is designed to resist tearing, cracking, and moisture
- Placement guides help with alignment and fastening
- Slip-resistant surfaces and up to 180 days of temporary UV exposure
Cons:- Not described as self-adhering or as a nail-seal membrane
- UV exposure is temporary and limited to the stated 180-day period
- Large roll format may be less convenient for small repairs
Best for: Roofing crews or experienced DIYers covering a large deck who want a 1,000-square-foot synthetic roll with alignment guides and slip-resistant surfaces.
Not ideal for: Buyers who need a peel-and-stick, self-sealing membrane for eaves or valleys, or who expect the underlayment to remain exposed beyond 180 days.
- Material:Woven polypropylene
- Model:SL154250LWE
- Dimensions:4 ft. x 250 ft.
- Coverage:1,000 sq. ft.
- Weight:18.5 pounds
- UV exposure:Up to 180 days
- Quantity:1 roll
Our verdict“Choose ShingleLayment-LWE for large, conventionally installed roof areas; choose a peel-and-stick option when self-sealing adhesion is the priority.”
MYOYAY Self-Adhesive Waterproof Roofing Roll, 39 in. × 32.8 ft., White
For a localized leak or exposed detail that needs a water barrier, this self-adhesive rubber membrane is more repair-oriented than the full-deck rolls in this group. Its 39-inch width and 32.8-foot length can be cut to fit, while the aluminum foil layer is intended to reflect heat and resist weather. That flexibility across metal, wood, concrete, and tile gives it more surface options than Zeluga’s mechanically attached synthetic underlayment, which is designed for broad roof coverage beneath shingles. The tradeoff is scale: this roll covers far less area than a 1,000-square-foot roll, and the product information does not provide a UV exposure duration or listed standards. Installation also depends on a clean surface, firm pressure, and overlapped seams, so it is less forgiving of rushed patch work.
Pros:- Self-adhesive backing allows cut-to-size placement without mechanical attachment.
- Rubber membrane is designed to form a waterproof barrier for repairs.
- Aluminum foil layer is intended to reflect heat and resist weather.
- Listed for use on metal, wood, concrete, tile, and other surfaces.
Cons:- The 32.8-foot roll is much smaller than the 1,000-square-foot rolls in this lineup.
- Installation calls for a clean surface, firm pressing, and overlapped seams.
- The supplied product information does not state UV exposure duration or roofing standards.
Best for: Homeowners or maintenance crews sealing a small roof section or repair area where a cut-to-fit adhesive membrane suits the surface.
Not ideal for: Roofers covering an entire deck or buyers who need stated code approvals, UV exposure limits, or a large-format underlayment roll.
- Material:Rubber membrane with aluminum foil layer
- Roll size:39 in. × 32.8 ft.
- Dimensions:393 × 39 × 0.06 in.
- Weight:12.19 lb
- Color:White
- Installation:Self-adhesive backing
- Manufacturer:MYOYAY
- Model number:USY7-40965
Our verdict“Choose this roll for cut-to-fit, localized waterproofing repairs, not full-roof underlayment coverage.”
Zeluga 32-390 Synthetic Roofing Underlayment, 48 in. x 250 ft., 1,000 sq. ft.
Zeluga earns a distinct place for roofs that may sit open during a longer installation window: its stated UV resistance is up to 180 days, longer than ArmorLay 25’s 60-day limit. The 1,000-square-foot roll also suits broad shingle-roof coverage, and printed nail and overlap guides help crews keep courses aligned and fastening consistent. Its textured, slip-resistant surface is a practical aid while working on the deck, though it does not remove the need for fall protection. Compared with BlackKnight, Zeluga lists several specific standards and Florida and Texas approvals, while BlackKnight includes a small starter supply of cap nails. The key limitation is that Zeluga requires mechanical attachment and remains secondary protection beneath a finished roof; it is not a standalone roofing surface.
Pros:- Up to 180 days of stated UV resistance supports a longer installation window than ArmorLay 25.
- A 1,000-square-foot roll covers a broad roof area.
- Textured slip-resistant surface supports footing during installation.
- Printed nail and overlap guides aid consistent placement and fastening.
Cons:- Requires mechanical attachment rather than self-adhesive installation.
- Provides secondary water protection and must be covered by the finished roofing.
- The listed coverage and installation format may be excessive for small repairs.
Best for: Roofing crews covering a large shingle deck that may remain exposed during a prolonged build and that need listed standards and placement guides.
Not ideal for: DIYers seeking a peel-and-stick membrane or anyone needing a finished, standalone waterproof roof covering.
- Manufacturer:Zeluga
- Model:32-390
- Roll size:48 in. × 250 ft.
- Coverage:1,000 sq. ft. (10 squares)
- Material:Woven polypropylene
- Weight:18.56 lb
- UV resistance:Up to 180 days
- Standards and approvals:ICC-ES ESR-5197, AC188, ASTM D8257, CAN/CSA A123.3; Florida FL-17194 and Texas T.D.I.
Our verdict“Pick Zeluga for large mechanically attached underlayment jobs where the roof deck may remain exposed for months.”
BlackKnight Professional Grade Synthetic Roofing Underlayment, 4 ft x 250 ft
BlackKnight is the most installation-focused pick in this group: its four-layer construction, traction surfaces, printed nail guides, and included cap nails package several job-site aids together. The 1,000-square-foot roll matches the broad coverage of Zeluga and ArmorLay, but BlackKnight supplies 50 galvanized plastic cap nails to get work started; that is a useful inclusion, not a complete fastening supply, since additional fasteners are sold separately. Its stated UV resistance of up to six months is longer than ArmorLay 25’s 60 days and broadly comparable to Interwrap UDL25’s six-month exposure limit. The tradeoff is that the product details do not list the standards or regional approvals provided for Zeluga, and the included nail quantity will cover only part of a full installation. This makes it a convenient package, not a no-extra-supplies solution.
Pros:- Four-layer construction is designed to resist moisture, tearing, and cracking.
- Traction surfaces support footing while laying the underlayment.
- Printed nail placement guides help with alignment and fastening.
- Includes 50 galvanized plastic cap nails to start installation.
Cons:- Additional fasteners are sold separately, so the included nails do not complete the job.
- The supplied product information does not list roofing standards or code approvals.
- Its 1,000-square-foot roll is a large format for patching or small roof sections.
Best for: Installers who want traction, fastening guides, and a starter supply of cap nails bundled with a full-size synthetic roll.
Not ideal for: Buyers expecting all fasteners for a 1,000-square-foot installation or needing stated code approvals in the supplied product details.
- Manufacturer:BlackKnight
- Part number:AM-BK-SRU4250
- Roll size:4 ft. × 250 ft.
- Coverage:1,000 sq. ft. (10 squares)
- Weight:23.6 lb
- Layers:4
- UV exposure resistance:Up to 6 months
- Included fasteners:50 galvanized plastic cap nails
Our verdict“Choose BlackKnight when bundled installation aids matter, but plan to source more fasteners for the full roof.”
ArmorLay 25 Synthetic Roof Underlayment, 4 ft x 250 ft
ArmorLay 25 is a straightforward choice for crews expecting to install the finished roof soon after laying underlayment. It covers 1,000 square feet per roll and has a textured, slip-resistant surface intended to support movement on steep slopes. Its stated resistance to buckling, warping, and cracking addresses common handling and exposure concerns, while the listed ASTM D4869 and ASTM D226 performance characteristics give buyers concrete reference points. The main compromise is a 60-day UV exposure limit: that is substantially shorter than Zeluga’s 180 days and BlackKnight’s six months, so this is not the strongest fit for projects facing delays. Compared with those longer-window options, ArmorLay makes more sense when scheduling is predictable and broad coverage is the priority. The supplied details do not specify fastening aids or included fasteners.
Pros:- A 1,000-square-foot roll covers a broad roof area.
- Textured, slip-resistant surface supports walkability on steep slopes.
- Designed to resist buckling, warping, and cracking.
- Lists ASTM D4869 and ASTM D226 performance characteristics.
Cons:- UV exposure is limited to up to 60 days, less than the longer-window options here.
- The supplied details do not specify included fasteners or printed placement guides.
- Water resistant underlayment is secondary protection, not a finished roof covering.
Best for: Roofing crews who need full-deck synthetic coverage and expect shingles or another finished roof covering to follow within the stated exposure window.
Not ideal for: Builders facing uncertain schedules or prolonged weather delays, since its UV exposure limit is shorter than Zeluga’s or BlackKnight’s.
- Coverage:1,000 sq. ft.
- Roll size:4 ft. × 250 ft.
- Material:Polyvinyl chloride (PVC)
- Color:Gray
- UV exposure:Up to 60 days
- Standards:ASTM D4869 and ASTM D226 performance characteristics
- Water resistance:Water resistant
- Mounting type:Roof mount
Our verdict“Choose ArmorLay for large coverage when the roof will be finished promptly, not when exposure may stretch for months.”
Interwrap UDL25 Roof Underlayment, 48 in x 250 ft
Interwrap UDL25 is the most versatile match for buyers choosing among several roof finishes: its listed compatibility spans asphalt and synthetic shingles, metal roofing, and cedar shakes. The slip-resistant surface is paired with a Class A fire rating and Class 4 hail rating, giving this option a different emphasis from BlackKnight’s layered construction and included starter nails. It also lists resistance to mold growth, a temperature range from -40°F to 240°F, and six months of UV exposure. Those specifications make it a strong candidate for varied roofing plans, though buyers should confirm that the product’s ratings and installation requirements suit their specific roof assembly and local rules. Its roll size is 48 inches by 250 feet, while ArmorLay is listed at four feet wide; either way, the six-month exposure cap means it still needs the finished roof on schedule.
Pros:- Listed for use beneath asphalt and synthetic shingles, metal roofing, and cedar shakes.
- Slip-resistant surface supports movement during roof installation.
- Class A fire and Class 4 hail ratings are stated.
- Resists mold growth and lists a wide operating temperature range.
Cons:- UV exposure is limited to six months, so extended open-deck projects may need another option.
- The supplied product details do not give a coverage figure or included fastener information.
- Buyers must confirm compatibility with their specific roof assembly and local requirements.
Best for: Roofers and property owners selecting underlayment for a project involving asphalt or synthetic shingles, metal roofing, or cedar shakes.
Not ideal for: Buyers who need a self-adhesive repair membrane, or who expect the roof deck to remain exposed beyond the stated six-month period.
- Brand:Interwrap
- Model:UDL25
- Roll size:48 in. × 250 ft.
- Material:Plastic
- Roofing compatibility:Asphalt shingles, synthetic shingles, metal roofing, and cedar shakes
- Temperature range:-40°F to 240°F
- UV exposure:6 months
Our verdict“Choose Interwrap UDL25 when roofing-material flexibility and stated fire and hail ratings matter more than a longer exposure window.”
APX Synthetic Roof Underlayment Roll, 48 in x 250 ft
The APX earns its place for roofers who want one synthetic underlayment suited to metal, shingle, and tile projects. Its four-layer polypropylene construction is rated for 90 days of UV exposure, longer than the SIPA’s stated 60-day limit, giving a broader window before the finished roofing goes on. At 1,000 square feet per roll, it also fits larger jobs better than the short GOOFCXO peel-and-stick membrane, which is aimed more at patches and limited areas.
APX is vapor permeable, non-slip, and described as resistant to tearing, wind, and fire. The tradeoff is the slope restriction: it is specified for roofs at 2:12 or steeper, so it is not the right choice for a lower-slope roof. Buyers should also verify that its listed standards and roof-system requirements match their project.
Pros:- Compatible with metal, shingle, and tile roofs
- Up to 90 days of stated UV exposure resistance
- Vapor-permeable construction helps moisture escape
- Non-slip surface and easy cutting support installation
Cons:- Specified only for roof slopes of 2:12 or steeper
- A 1,000-square-foot roll may be more material than a small repair needs
Best for: Roofers handling shingle, metal, or tile roofs at 2:12 or steeper who want a full-coverage roll and a longer stated UV window.
Not ideal for: Owners of roofs below a 2:12 slope, or buyers seeking a small self-adhesive repair membrane rather than roll underlayment.
- Dimensions:48 in x 250 ft
- Coverage:1,000 sq ft
- Material:Polypropylene, four-layer construction
- Weight:18.36 lbs
- Vapor permeability:0.12 perms
- UV exposure resistance:Up to 90 days
- Roof slope:2:12 (17%) or steeper
- Standards:ASTM; ICC-ES AC188; ASTM E108 Class A
Our verdict“Choose APX for broad roof-material compatibility and a longer UV window, provided the roof meets its minimum slope.”
GOOFCXO Self-Adhesive Waterproof Roofing Membrane Roll, 39 in x 16.4 ft
GOOFCXO is the most targeted option here: a short peel-and-stick membrane for sealing localized roof areas, rather than a full-deck underlayment roll. Its adhesive installation needs no heating equipment, which makes it simpler to apply around a repair than a large mechanically fastened roll such as SIPA. The polyethylene waterproof layer, geotextile fabric, and adhesive film are intended to stay flexible as weather changes, and the product lists metal, plastic, porch, and RV roofing among its possible uses.
That versatility comes with limits. At just 39 inches by 16.4 feet, it covers far less area than APX or DuPont Roof Protector, so it is a poor fit for a whole-roof job. Adhesion also depends on careful preparation: dirt on the surface can undermine the bond. I’d choose it for a confined patch, not as a substitute for a project-sized underlayment system.
Pros:- Peel-and-stick application requires no heating device
- Waterproof polyethylene layer is suited to localized sealing
- Designed to remain flexible through changing weather
- Lists several possible surface types, including metal and plastic
Cons:- Short roll length covers only a limited area
- Adhesion depends on a clean, dirt-free surface
- Does not provide the project-scale coverage of APX or DuPont Roof Protector
Best for: Homeowners or repair crews sealing a small, accessible roof area on a compatible metal, plastic, porch, or RV surface.
Not ideal for: Roofers underlaying an entire residential roof or working on a dirty surface that cannot be properly cleaned before application.
- Dimensions:39 in x 16.4 ft
- Material:Polyethylene sheet, geotextile fabric, polymer adhesive film
- Installation:Self-adhesive; no heating device required
- Color:Grey
- Model:USC13-40893
- Brand:GOOFCXO
- Included components:Self-adhesive roofing membrane
- Listed applications:Metal, plastic, porch, RV, and other roofing surfaces
Our verdict“Pick GOOFCXO for a small peel-and-stick repair, not for covering a full roof deck.”
SIPA 100 GSM Synthetic Waterproof Roof Underlayment, 48 in x 250 ft
SIPA is a straightforward choice for buyers who need 1,000 square feet of synthetic coverage beneath asphalt shingles or metal roofing. Its non-woven polypropylene and polyethylene laminate is described as water-resistant, and its stated standards and TDI/FBC approval give project planners useful specification details to check against local requirements. Compared with the APX, SIPA has a shorter 60-day UV exposure window and a narrower listed roof-material range; APX also names tile roofing and claims 90 days.
The distinction is practical: SIPA suits a conventional shingle or metal installation where the covering will go on within its UV limit. It is lightweight, but installation requires separate roofing nails with plastic caps or cap staples, so it is not a peel-and-stick alternative like GOOFCXO. I would skip it for tile work or a schedule likely to leave the deck exposed beyond 60 days.
Pros:- Covers 1,000 square feet per roll
- Compatible with asphalt shingles and metal roofing
- Water-resistant construction with up to 60 days of stated UV tolerance
- Lists ASTM standards and TDI/FBC approval
Cons:- Requires separate roofing nails with plastic caps or cap staples
- Its 60-day UV window is shorter than APX’s stated 90 days
- Listed compatibility does not include tile roofing
Best for: Residential or commercial crews covering 1,000 square feet beneath asphalt shingles or metal roofing, with fasteners available and roofing scheduled within 60 days.
Not ideal for: Buyers installing tile roofing, seeking a self-adhesive membrane, or expecting the roof deck to remain exposed beyond the stated UV limit.
- Dimensions:48 in x 250 ft
- Coverage:1,000 sq ft
- Weight:21.1 lbs
- Material:Non-woven polypropylene laminated with polyethylene and UV- and water-resistant adhesive
- UV resistance:Up to 60 days
- Compatible roof types:Asphalt shingle and metal
- Standards:Meets or exceeds ASTM D4869 and ASTM D226; description also cites ASTM D4533
- Approvals:TDI/FBC approved
Our verdict“Choose SIPA for a standard shingle or metal job when mechanical fasteners and a 60-day installation schedule suit the project.”
DuPont Roof Protector Roofing Underlayment Roll, 42 in × 286 ft
DuPont Roof Protector is the lineup’s focused pick for steep-slope roofs beneath asphalt shingles or metal. Its four-layer construction combines a water-resistant laminate with woven polypropylene scrim, while grip surfaces are intended to help with footing and handling during installation. Compared with SIPA, it offers a longer roll—286 feet rather than 250—but the narrower 42-inch width means buyers should compare coverage and seam layout for their specific roof rather than assume the longer roll is automatically more efficient.
The reinforced scrim is a useful choice for crews concerned about tearing as material is positioned, and the product provides a secondary moisture barrier beneath the finished roofing. The supplied data does not state UV exposure limits, total roll coverage, or a roof-slope rating beyond “steep-slope,” so I would confirm those details for a delayed installation or a roof outside typical steep-slope work. It is less broadly specified than APX, which lists tile compatibility and a 90-day UV limit.
Pros:- Four-layer construction with woven polypropylene scrim
- Tear-resistant design helps during handling and installation
- Grip surfaces support installation on steep-slope roofs
- Provides a secondary moisture barrier beneath shingles or metal roofing
Cons:- Roll is narrower than the 48-inch APX and SIPA options
- Provided product data does not state UV exposure resistance
- Provided product data does not give total coverage or a numeric slope rating
Best for: Roofers installing asphalt shingles or metal on steep-slope roofs who value reinforced, tear-resistant material and grip surfaces.
Not ideal for: Buyers who need a stated UV exposure window, confirmed tile compatibility, or a specified coverage figure before ordering.
- Roll width:42 in (3.5 ft)
- Roll length:286 ft
- Roll coverage:10 squares
- Construction:Four-layer synthetic
- Material:Woven polypropylene scrim
- Weight:19 lb
- Package quantity:1
- Listed roof types:Asphalt shingles or metal roofing
Our verdict“Choose DuPont Roof Protector for steep-slope shingle or metal work when reinforced construction matters more than published UV and coverage details.”
How We Picked
I organized these 14 options by the job they appear designed to do, rather than treating every roll as interchangeable. The main comparison points were installation type (self-adhering membrane or synthetic underlayment), listed dimensions and coverage, stated temperature or material details, and the practical fit for a full roof versus a smaller area. Where the product name and listing provide limited technical information, I avoid assuming performance that is not specified.
The ranking favors products with a clear use case and useful listed dimensions, while separating broad-coverage rolls from compact adhesive membranes. DuPont leads as an all-around synthetic candidate because its listed roll is longer than the common 250-foot options; Grip-Rite’s high-temperature membrane ranks strongly for a narrower, specific need. The order is not a substitute for local code or manufacturer instructions: a product that suits one roof assembly may be unsuitable for another, regardless of its position here.
Factors to Consider When Choosing Best Roof Underlayment
Choosing roof underlayment starts with the roof assembly and installation conditions, not the product name. Use these factors to compare options that may look similar on a roll but serve different roles once installed.
Match the Underlayment Type to the Roof Assembly
Self-adhering membranes and synthetic rolls solve related but different problems. A peel-and-stick product bonds to the roof deck and is often selected for specific water-sensitive areas or assemblies that call for adhered protection. Synthetic rolls are typically mechanically fastened and are commonly used as broad underlayment coverage beneath the roof covering. Do not assume one can replace the other just because both are labeled waterproof or roofing underlayment. Check the roofing manufacturer’s assembly details, local requirements, and the underlayment’s installation instructions before substituting materials.
Check Temperature Limits and Exposure Conditions
Temperature limits affect whether a membrane is suitable for the roof surface and the conditions during installation. The Grip-Rite ShingleLayment listing specifically identifies a high-temperature version, while other products in this group do not provide that claim in their names. That distinction can matter under heat-generating roof coverings or in hot conditions, but the name alone does not confirm suitability for every assembly. Verify the technical data sheet for service-temperature limits and approved roof-covering types. Also check how long the material may remain exposed before the finished roof is installed; a product that tolerates one site schedule may not suit another.
Calculate Coverage After Overlaps and Waste
Advertised roll area is not the same as usable roof coverage because courses overlap and cuts create offcuts. Measure each roof plane, then account for valleys, hips, ridges, penetrations, and the overlap specified by the manufacturer. This matters especially when comparing the compact 16.4-foot and 32.8-foot membrane rolls with synthetic rolls listed at hundreds of feet. Buying by the headline area alone can leave a job short or produce avoidable leftovers. For complex roofs, have the installer estimate roll quantities from a layout rather than relying only on total square footage.
Confirm Code, Roof-Pitch, and Material Compatibility
Underlayment rules vary by location and can depend on roof pitch, climate exposure, and the roof covering. A product suitable beneath asphalt shingles may not be approved for a particular metal roof or another covering. Check local building-code requirements and the roofing system manufacturer’s approved components before ordering. Pay attention to instructions about fastening, side and end laps, deck preparation, and placement at eaves or valleys. If a specification is missing from a retailer listing, request the manufacturer’s technical documentation rather than inferring compliance from the product name.
Plan for Installation Conditions and Crew Experience
Roll handling, adhesive backing, and fastening methods can change how manageable a product is on site. Self-adhering membranes require careful deck preparation and placement because repositioning may be difficult once the adhesive makes contact. Synthetic rolls require a fastening plan and correct lap placement, and wind can complicate installation before the roof covering is installed. Buyers coordinating a crew should confirm that the installer has worked with the chosen product and will follow its instructions. For a first-time project, professional installation can prevent costly errors around seams and penetrations.
Compare Documentation, Not Just Brand or Roll Size
Two rolls with similar dimensions may differ in strength, slip resistance, permeability, exposure limits, and approved uses. Those details can matter more than a familiar brand name or a small difference in roll width. Request data sheets that state the relevant performance properties and installation limits, and compare them against the roof system’s requirements. If a listing supplies little technical detail, treat that uncertainty as a reason to investigate rather than as proof of poor quality. Paying more makes sense when the documentation supports a roof-specific need; a larger roll alone does not establish better protection.
Frequently Asked Questions
Can I use a self-adhering membrane across the entire roof instead of synthetic underlayment?
Sometimes, but only when the roof design, local code, and roofing manufacturer allow that assembly. Self-adhering membranes differ from synthetic rolls in application, deck requirements, and installation handling, so they are not automatic substitutes. Full-deck use can also change material quantities and labor needs compared with using membrane only in selected areas. Check the product’s technical sheet for approved roof coverings, slope limits, and exposure conditions. Ask the installer to confirm the planned assembly before ordering.
How do I choose between a 250-foot synthetic roll and a short membrane roll?
Start with the role each material will play, then calculate usable coverage after required laps and cuts. The 250-foot synthetic rolls in this roundup are listed for broad roof coverage, while the shorter MYOYAY and GOOFCXO rolls are more suited to limited areas or a specified membrane application. A short roll can be the right choice for a repair or targeted installation, but it is usually not a direct coverage comparison with a full-size roll. Confirm the manufacturer’s approved use and the dimensions of the area you need to cover. If combining products, verify that the roof assembly permits that combination.
Does a high-temperature underlayment matter under metal roofing?
It can matter because some roof coverings and roof designs expose underlayment to higher temperatures than others. The Grip-Rite high-temperature listing calls out that feature, but that label by itself does not confirm compatibility with every metal roof. Check both the metal-panel manufacturer’s underlayment requirements and the membrane’s temperature limits. Also review any restrictions on direct contact with the roof covering and the required fastening or separation layers. When documentation is unclear, ask the roofing supplier or manufacturer before installation.
How much underlayment should I buy for a roof?
Measure the roof planes rather than relying on the home’s floor area, then account for slope, overlaps, valleys, hips, penetrations, and trimming waste. The listed roll dimensions provide a starting point, but the manufacturer’s required lap widths reduce the area each roll covers in practice. Roof geometry can make two roofs with the same footprint require different quantities. Ask the installer to calculate coverage from the roof plan and the chosen product’s installation instructions. Order quantities should also account for the possibility that a damaged or miscut section needs replacement.
Which details should I verify before ordering an underlayment online?
Confirm the exact product version, roll dimensions, material type, approved roof coverings, temperature limits, and permitted exposure duration. Check whether the listing includes the current technical data sheet and installation instructions, since short product descriptions may omit key limits. Compare those documents with local code and the roofing system manufacturer’s requirements. Verify how many rolls are needed after overlaps and roof waste, and confirm that accessories or compatible fasteners are available if required. If a specification that affects your roof is missing, get written clarification before placing the order.
Conclusion
For the best overall balance of broad coverage and a clear synthetic-roll role, I would start with DuPont Roof Protector, then verify its specifications against the roof system. The best value by project fit may be Grip-Rite ShingleLayment-LWE when a full-size synthetic roll suits the job; compare documented performance and usable coverage rather than choosing on roll size alone. For a premium or heat-specific application, consider Grip-Rite ShingleLayment High-Temperature only when its technical limits match the roof assembly. Beginners should have an experienced roofer confirm the product type, quantity, and installation details before purchase. For small or targeted areas, the compact MYOYAY or GOOFCXO membranes may be a better format, while buyers covering a large roof should compare the 250-foot synthetic options first.
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