For most standard shingle-roof projects, DuPont Roof Protector is my best overall pick for its established synthetic format and broad roll coverage. Grip-Rite ShingleLayment HT stands out when a self-adhering layer suits the roof details, while ZIP System Peel and Stick is a specialty option for buyers who need an adhesive underlayment. The main tradeoff is between easy-to-handle synthetic rolls and peel-and-stick products that bond to the deck but call for more careful installation. Roll dimensions, temperature limits, roof slope, and local code requirements can matter as much as the product name. Read on for the full comparison and guidance on matching an underlayment to your roof.
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Key Takeaways
- DuPont Roof Protector ranks first for general use because its 42-inch-by-286-foot roll offers a different coverage format from the common 4-foot-by-250-foot rolls; check project-area calculations before ordering.
- Grip-Rite HT and ZIP System serve adhesive-focused jobs, but self-adhering products are not interchangeable: confirm temperature range, substrate preparation, and installation instructions for your roof.
- Most picks are synthetic roll underlayments, so the comparison turns on fit, handling, and stated product details rather than a large range of installation styles.
- Roll dimensions can change job planning; compare coverage and usable width, not just the listed roll length, to estimate seams, waste, and handling needs.
- Product names and GSM figures do not replace specifications; verify code acceptance, exposure limits, fastening methods, and compatibility with the roofing system before buying.
| HydroShield 50-Year Synthetic Underlayment, Single Roll |  | Best for Installation Guidance | Coverage: 10 squares | Roll length: 250 lineal feet | Roll width: 48 inches | VIEW LATEST PRICE | See Our Full Breakdown |
| ArmorLay 25 Synthetic Roof Underlayment, 4 ft x 250 ft |  | Best for Steep-Slope Walkability | Coverage: 1,000 square feet | Roll dimensions: 4 ft x 250 ft | Material: Polyvinyl chloride (PVC) | VIEW LATEST PRICE | See Our Full Breakdown |
| Grip-Rite ShingleLayment HT Self-Adhering Synthetic Roofing Underlayment, 3 ft x 67 ft |  | Best Self-Adhering Pick | Model: SL2SQHT | Material: Polypropylene | Roll size: 3 ft x 67 ft | VIEW LATEST PRICE | See Our Full Breakdown |
| DuPont Roof Protector Synthetic Roofing Underlayment Roll, 42 in. x 286 ft. |  | Best Reinforced Construction | Construction: Four-layer synthetic underlayment | Roll coverage: 10 squares | Roll width: 3.5 ft | VIEW LATEST PRICE | See Our Full Breakdown |
| Interwrap UDL25 Roof Underlayment, 48 in x 250 ft |  | Best for Roofing-Type Versatility | Model: UDL25 | Roll size: 48 in x 250 ft | Material: Plastic | VIEW LATEST PRICE | See Our Full Breakdown |
| Zeluga 32-390 Synthetic Roofing Underlayment, 48 in. x 250 ft., 1,000 sq. ft. |  | Best for Long Exposure Windows | Material: Woven polypropylene | Weight: 95 GSM | Roll dimensions: 48 in. x 250 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| SIPA 100 GSM Synthetic Waterproof Roof Underlayment, 48 in. x 250 ft. |  | Best for Mixed Shingle and Metal Roofs | Material: Non-woven polypropylene laminated with polyethylene | Weight: 100 GSM; 21.1 lb listed roll weight | Roll size: 48 in. x 250 ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| BlackKnight 4 ft x 250 ft Synthetic Roofing Underlayment, Professional Grade |  | Best for Traction and Installation Guidance | Roll size: 4 ft. x 250 ft. | Coverage: 1,000 sq. ft. (10 squares) | Construction: Four layers | VIEW LATEST PRICE | See Our Full Breakdown |
| Grip-Rite ShingleLayment-LWE Synthetic Roofing Underlayment, 4 ft x 250 ft |  | Best for Long-Exposure Woven Polypropylene | Material: Woven polypropylene | Dimensions: 4 ft. x 250 ft. | Coverage: 1,000 sq. ft. | VIEW LATEST PRICE | See Our Full Breakdown |
| ZIP System Peel and Stick Roof Underlayment, Standard Temperature |  | Best for Self-Adhering Waterproofing | Manufacturer: Huber Engineered Woods | Part number: S-20036 | Material: Rubberized asphalt | VIEW LATEST PRICE | See Our Full Breakdown |
| ApxRoufin Synthetic Roofing Underlayment, 48 in x 250 ft |  | Best for Broad Roof Compatibility | Dimensions: 48 in x 250 ft | Coverage: 1,000 sq ft | Material: Polypropylene; four-layer construction | VIEW LATEST PRICE | See Our Full Breakdown |
| roof underlayment | Coverage | Material | Weight |
|---|---|---|---|
| HydroShield 50-Year Synthetic | 10 squares | — | — |
| ArmorLay 25 Synthetic Roof Und | 1,000 square feet | Polyvinyl chloride (PVC) | — |
| Grip-Rite ShingleLayment HT Se | 201 square feet | Polypropylene | 28 pounds |
| DuPont Roof Protector Syntheti | — | — | 19 lb |
| Interwrap UDL25 Roof Underlaym | — | Plastic | — |
| Zeluga 32-390 Synthetic Roofin | 1,000 sq. ft. (10 squares) | Woven polypropylene | 95 GSM |
| SIPA 100 GSM Synthetic Waterpr | 1,000 sq. ft. | Non-woven polypropylene laminated with polyethylene | 100 GSM; 21.1 lb listed roll weight |
| BlackKnight 4 ft x 250 ft Synt | 1,000 sq. ft. (10 squares) | — | 23.6 lb |
| Grip-Rite ShingleLayment-LWE S | 1,000 sq. ft. | Woven polypropylene | 18.5 lb |
| ZIP System Peel and Stick Roof | — | Rubberized asphalt | — |
| ApxRoufin Synthetic Roofing Un | 1,000 sq ft | Polypropylene; four-layer construction | 18.36 lb |
More Details on Our Top Picks
HydroShield 50-Year Synthetic Underlayment, Single Roll
HydroShield stands out for clear layout cues: printed nailing and overlap lines give installers visible reference points while positioning each course. That can help keep spacing consistent, especially for crews who want more guidance than the plain specifications suggest. Its 10-square coverage and 19-pound roll also make it a relatively light option to move across the roof. Compared with DuPont Roof Protector, which emphasizes a reinforced four-layer build and slip-resistant surfaces, HydroShield’s strongest documented distinction is its long stated warranty and printed layout aids. The tradeoff is that the product details do not specify a slip-resistant surface, material construction, or UV exposure window, so I would not choose it over a more fully specified option when roof access or extended exposure is the main concern.
Pros:- Printed nailing and overlap lines help guide course placement
- Covers 10 squares per roll
- Stated 50-year warranty
- 19-pound item weight is manageable relative to its coverage
Cons:- Slip resistance is not specified
- No temporary UV exposure limit is provided
- Material construction details are not listed
Best for: Roofing crews and experienced DIYers who want printed nailing and overlap guides, broad roll coverage, and a stated long warranty.
Not ideal for: Installers who need documented slip resistance or a specified UV exposure period before roofing goes on; those details are not provided here.
- Coverage:10 squares
- Roll length:250 lineal feet
- Roll width:48 inches
- Weight per square:2.0 pounds
- Item weight:19 pounds
- Color:Off-white
- Warranty:50 years
- Compliance information:ASTM D-4869, ASTM D-5034, ASTM D-226, ASTM D-4533, ASTM D-7349, ICC ESR-4487
Our verdict“Choose HydroShield if printed installation guides and its stated 50-year warranty matter more than documented grip or UV exposure details.”
ArmorLay 25 Synthetic Roof Underlayment, 4 ft x 250 ft
ArmorLay 25 puts roof-deck grip first. Its textured fabric and slip-resistant polymer bottom are intended to support walkability on steep slopes, a useful distinction from HydroShield, whose listed details focus more on printed layout guides than traction. The 4-by-250-foot roll covers 1,000 square feet, giving crews a standard full-roll coverage figure for planning. Its PVC construction is described as resisting buckling, warping, and cracking, which may help the underlayment stay stable during installation. The main limit is the 60-day UV exposure window: this is a better fit when roofing will follow on a reasonably short schedule, not when the deck may remain exposed for months. I would also compare its documented grip claims with DuPont Roof Protector if tear resistance and reinforced construction matter more.
Pros:- Textured surface and slip-resistant polymer bottom support roof-deck traction
- Covers 1,000 square feet per roll
- Designed to resist buckling, warping, and cracking
- Water-resistant PVC construction
Cons:- Temporary UV exposure is limited to 60 days
- The product description does not state a warranty duration
- Walkability features do not replace safe roof-access procedures
Best for: Roofers working on steep-slope projects who prioritize a textured walking surface and expect to install the finished roofing within 60 days.
Not ideal for: Homeowners or contractors facing prolonged scheduling delays, since the stated temporary UV exposure period is limited to 60 days.
- Coverage:1,000 square feet
- Roll dimensions:4 ft x 250 ft
- Material:Polyvinyl chloride (PVC)
- Water resistance:Water resistant
- Surface:Textured fabric with slip-resistant polymer bottom
- UV exposure:Up to 60 days
- Color:Gray
- Standards:ASTM D4869 and ASTM D226
Our verdict“Pick ArmorLay 25 for steep-slope work where its grip-focused design is useful and the roofing schedule fits its 60-day exposure limit.”
Grip-Rite ShingleLayment HT Self-Adhering Synthetic Roofing Underlayment, 3 ft x 67 ft
Grip-Rite ShingleLayment HT is the self-adhering choice in this group, with a self-sealing design intended to help seal around fasteners while adding a barrier against ice and snow. Its slip-resistant top and base also address traction during installation, and the stated 180-day UV exposure period gives a longer temporary window than ArmorLay 25’s 60 days. That makes it a different kind of pick from the large-roll options: at 201 square feet, this roll may suit targeted roof areas or projects where an adhesive underlayment is specifically wanted, but it means more rolls for broad coverage. The 28-pound package is also relatively heavy for its coverage. Compared with Interwrap UDL25, it offers self-adhering and self-sealing features, while Interwrap covers more roofing types and lists fire and hail ratings.
Pros:- Self-adhering, self-sealing design supports attachment and sealing around fasteners
- Designed to provide an ice and snow barrier
- Slip-resistant surfaces on the top and base
- Up to 180 days of temporary UV exposure
Cons:- 201-square-foot coverage is much smaller than the 1,000-square-foot rolls in this roundup
- The 28-pound package is heavy relative to its listed coverage
- The product details do not state a warranty duration
Best for: Roofers who need a self-adhering, self-sealing underlayment for targeted areas or projects requiring an ice-and-snow barrier.
Not ideal for: Buyers covering a large roof who want fewer rolls to handle, or crews that do not need an adhesive installation method.
- Model:SL2SQHT
- Material:Polypropylene
- Roll size:3 ft x 67 ft
- Coverage:201 square feet
- Weight:28 pounds
- Temperature resistance:High temperature
- UV exposure:Up to 180 days
- Package quantity:1
Our verdict“Choose Grip-Rite ShingleLayment HT when self-adhering protection is the priority and its smaller roll coverage suits the job.”
DuPont Roof Protector Synthetic Roofing Underlayment Roll, 42 in. x 286 ft.
DuPont Roof Protector earns its place through a layered build: the four-layer construction includes a water barrier and reinforced woven polypropylene scrim, giving buyers a clear reason to favor it when tear resistance is a priority. Its 286-foot roll provides 10-square coverage, which can reduce seams and installation waste on a steep-slope roof. Slip-resistant surfaces add a practical grip feature that HydroShield’s listed specifications do not confirm. The compromise is that this product is specified for steep-slope roofing, so it is not the flexible all-roof choice its underlayment role might imply. The provided data also gives no warranty duration or temporary UV exposure limit. Compared with ArmorLay 25, DuPont supplies more detail about reinforced construction and coverage length, while ArmorLay explicitly describes its bottom traction layer and resistance to buckling.
Pros:- Four-layer construction includes a water barrier and reinforced woven polypropylene scrim
- Slip-resistant surfaces support grip on the roof deck
- 10-square roll coverage can reduce seams and handling interruptions
- Listed for use under asphalt shingles or metal cladding
Cons:- Designed for steep-slope roofing applications
- Warranty duration is not specified
- Temporary UV exposure limit is not specified
Best for: Roofing crews covering steep-slope roofs under asphalt shingles or metal cladding who value reinforced construction and long roll coverage.
Not ideal for: Buyers who need a stated warranty or UV exposure period, or those working on roof types outside the listed steep-slope applications.
- Construction:Four-layer synthetic underlayment
- Roll coverage:10 squares
- Roll width:3.5 ft
- Roll length:286 ft
- Weight:19 lb
- Recommended use:Steep-slope roofs under asphalt shingles or metal cladding
- Product dimensions:48 x 8 x 8 in.
Our verdict“Choose DuPont Roof Protector for steep-slope projects where reinforced construction and long roll coverage outweigh missing warranty and UV details.”
Interwrap UDL25 Roof Underlayment, 48 in x 250 ft
Interwrap UDL25 is the broad-compatibility pick: its listed uses include asphalt and synthetic shingles, metal roofing, and cedar shakes. That range makes it a practical option for buyers choosing underlayment around the roof covering rather than a single material. It also pairs a Class A fire rating with a Class 4 hail rating, details not provided for HydroShield or ArmorLay 25. Its stated temperature range of -40°F to 240°F and six-month UV exposure period can suit projects with varied conditions or a longer installation window. The tradeoff is that it is still intended for steep-slope roofs, and its plastic material description is less specific than DuPont Roof Protector’s four-layer construction. Compared with Grip-Rite ShingleLayment HT, Interwrap offers broader covering compatibility, but not a self-adhering, self-sealing installation design.
Pros:- Listed for use beneath several roofing types, including cedar shakes and metal
- Class A fire rating and Class 4 hail rating
- Temperature range from -40°F to 240°F
- Six-month UV exposure period, with at least 20% reclaimed content and full recyclability listed
Cons:- Intended for steep-slope roofing
- UV exposure is limited to six months
- Material is identified only as plastic, with no more detailed construction information
Best for: Roofing contractors and property owners choosing underlayment for steep-slope roofs with asphalt or synthetic shingles, metal roofing, or cedar shakes.
Not ideal for: Buyers who need a self-adhering ice-and-snow barrier or underlayment specifically intended for roof applications beyond steep slopes.
- Model:UDL25
- Roll size:48 in x 250 ft
- Material:Plastic
- Recommended uses:Under asphalt or synthetic shingles, metal roofing, and cedar shakes
- Temperature range:-40°F to 240°F
- UV exposure:6 months
- Reclaimed content and recyclability:Minimum 20% reclaimed content; 100% recyclable
Our verdict“Choose Interwrap UDL25 when roofing-material compatibility, fire and hail ratings, and a longer stated exposure window matter most.”
Zeluga 32-390 Synthetic Roofing Underlayment, 48 in. x 250 ft., 1,000 sq. ft.
The Zeluga 32-390 suits projects where the roof may remain uncovered between installation stages: its UV treatment lasts up to 180 days, matching Grip-Rite ShingleLayment-LWE and exceeding SIPA’s 60-day allowance. The 1,000-square-foot roll covers 10 squares, while printed overlap and fastening guides help crews keep placement consistent. Its 95 GSM woven polypropylene construction and slip-resistant TPO surface add practical handling support, though surface traction is not a substitute for fall protection. Zeluga also lists multiple code and regional approvals, giving specification-minded buyers more documentation than the supplied SIPA details. The tradeoff is that this is designed for mechanically attached roofing, so it is not the self-adhering waterproofing approach offered by ZIP System Peel and Stick. Choose it for extended temporary exposure and straightforward roll coverage, not for a bonded nail-seal barrier.
Pros:- Up to 180 days of UV resistance supports longer installation schedules.
- Slip-resistant TPO-textured surface can support footing during installation.
- Printed fastening and overlap guidelines help standardize placement.
- One roll covers 1,000 square feet, or 10 squares.
Cons:- Designed for mechanically attached roofing rather than self-adhering installation.
- A roll covers a large area, which may be cumbersome for small repairs or limited projects.
Best for: Roofing crews who need a mechanically attached synthetic underlayment with a long temporary exposure window and clear placement guides.
Not ideal for: Buyers seeking a self-adhering nail-seal membrane or a product intended to bond directly to the roof deck.
- Material:Woven polypropylene
- Weight:95 GSM
- Roll dimensions:48 in. x 250 ft.
- Coverage:1,000 sq. ft. (10 squares)
- UV resistance:Up to 180 days
- Surface:Slip-resistant TPO texture
- Item weight:18.56 lb
- Approvals:ICC-ES ESR-5197, AC188, ASTM D8257, CAN/CSA A123.3; Florida FL-17194 and Texas T.D.I.
Our verdict“Choose Zeluga when you want a mechanically fastened, full-coverage roll with up to 180 days of UV exposure protection.”
SIPA 100 GSM Synthetic Waterproof Roof Underlayment, 48 in. x 250 ft.
SIPA stands out for buyers who need one underlayment option across asphalt shingle and metal roofing projects. Its 1,000-square-foot roll is comparable in coverage to Zeluga 32-390 and Grip-Rite ShingleLayment-LWE, but its 60-day UV limit gives crews less time to leave the deck exposed than either 180-day alternative. The non-woven polypropylene laminated with polyethylene is described as water-resistant, and the listed ASTM standards and TDI/FBC approval offer useful project documentation. SIPA is a mechanically fastened product: roofing nails or cap staples are required and must be sourced separately. That keeps it distinct from ZIP System Peel and Stick, which bonds to the deck and creates a nail-seal barrier. SIPA makes sense for standard roof assemblies that move promptly to final covering, but its shorter exposure window is a poor fit for weather-delayed schedules.
Pros:- Listed for use with both asphalt shingles and metal roofing.
- Provides 1,000 square feet of coverage per roll.
- Water-resistant laminated polypropylene construction.
- Includes ASTM standards and TDI/FBC approval information.
Cons:- UV resistance is limited to up to 60 days, less than Zeluga and Grip-Rite’s stated 180 days.
- Roofing nails or cap staples are required but not included.
Best for: Contractors and property owners using the same underlayment for residential or commercial asphalt-shingle and metal roof work.
Not ideal for: Crews facing uncertain schedules or extended uncovered periods, since its stated UV resistance is limited to 60 days.
- Material:Non-woven polypropylene laminated with polyethylene
- Weight:100 GSM; 21.1 lb listed roll weight
- Roll size:48 in. x 250 ft.
- Coverage:1,000 sq. ft.
- UV resistance:Up to 60 days
- Roofing compatibility:Asphalt shingles and metal roofing
- Standards:ASTM D4869, ASTM D226, ASTM D4533
- Approval:TDI/FBC approved
Our verdict“Pick SIPA for a mechanically fastened roll suited to both shingle and metal roofs when the project can be covered within its shorter UV window.”
BlackKnight 4 ft x 250 ft Synthetic Roofing Underlayment, Professional Grade
BlackKnight is the installation-focused choice in this group: its traction surfaces on both sides, printed nail guides, and included 50 galvanized plastic cap nails give crews a more guided start than SIPA, which requires fasteners to be purchased separately. The four-layer construction is designed to resist tearing, cracking, and moisture, while the 1,000-square-foot roll matches the coverage of Zeluga and Grip-Rite. Its listed UV resistance of up to six months makes it a fit for projects that may pause, though Zeluga and Grip-Rite specify up to 180 days, so the stated windows are broadly similar rather than a clear advantage. The included fasteners are a useful head start, not a complete supply for the full roll; more must be bought separately. Pick BlackKnight for handling features and layered construction, but account for additional fasteners and follow proper jobsite safety practices.
Pros:- Four-layer construction is designed to resist tearing, cracking, and moisture.
- Non-woven traction top and slip-resistant base support handling on the roof.
- Printed nail guides simplify alignment and fastening placement.
- Includes 50 galvanized plastic cap nails.
Cons:- Only 50 cap nails are included, so additional fasteners are sold separately.
- UV resistance is stated as up to six months; uncovered exposure still needs project planning.
Best for: Roofing crews who value printed fastening guides, traction-oriented surfaces, and a starter supply of cap nails in the package.
Not ideal for: Buyers expecting all fasteners for the full installation to be included or needing a self-adhering membrane rather than a mechanically attached roll.
- Roll size:4 ft. x 250 ft.
- Coverage:1,000 sq. ft. (10 squares)
- Construction:Four layers
- Surface:Non-woven traction top with slip-resistant base
- UV resistance:Up to 6 months
- Included fasteners:50 galvanized plastic cap nails
- Weight:23.6 lb
- Color:Black
Our verdict“Choose BlackKnight if traction features and printed fastening guidance matter more than having every installation fastener in the package.”
Grip-Rite ShingleLayment-LWE Synthetic Roofing Underlayment, 4 ft x 250 ft
Grip-Rite ShingleLayment-LWE is a straightforward pick for crews wanting a woven polypropylene roll with up to 180 days of UV exposure. That window matches Zeluga 32-390 and gives it a longer stated allowance than SIPA’s 60 days. Its slip-resistant top and base, alignment guides, and chalk-line-holding texture are aimed at accurate layout, rather than the layered construction and included starter cap nails that distinguish BlackKnight. Coverage is the familiar 1,000 square feet, making it suitable for full roof sections rather than spot repairs. The key limitation is that the product is described for temporary outdoor exposure during roofing work: it is a secondary layer beneath the roof covering, not a permanent exposed finish. Compared with ZIP System Peel and Stick, it also does not create a self-adhering nail-seal barrier. Choose Grip-Rite for a mechanically fastened, guide-oriented installation with a long staging window.
Pros:- UV treatment allows up to 180 days of temporary outdoor exposure.
- Woven polypropylene is designed to resist tearing, cracking, and moisture.
- Slip-resistant surfaces on the top and base support installation handling.
- Alignment guides and chalk-line-holding texture aid layout.
Cons:- Intended as temporary exposure protection during roofing work, not as a finished exposed covering.
- Does not provide the self-adhering nail-seal approach of ZIP System Peel and Stick.
Best for: Roofing crews who want a woven polypropylene underlayment with layout aids and up to 180 days of temporary exposure protection.
Not ideal for: Buyers seeking a self-adhering membrane, a permanent exposed roof surface, or a smaller roll for isolated repairs.
- Material:Woven polypropylene
- Dimensions:4 ft. x 250 ft.
- Coverage:1,000 sq. ft.
- Weight:18.5 lb
- UV exposure:Up to 180 days
- Surface features:Slip-resistant top and base; chalk-line-holding texture
- Model:SL154250LWE
- Pack quantity:1
Our verdict“Choose Grip-Rite for a guide-equipped woven roll when the roof needs a long temporary exposure window before final covering.”
ZIP System Peel and Stick Roof Underlayment, Standard Temperature
ZIP System is the distinct choice here for buyers who want a self-adhering rubberized asphalt membrane rather than a mechanically fastened synthetic roll. Its waterproof barrier is designed to seal around nails, a useful difference at vulnerable areas such as eaves and valleys. Zeluga, SIPA, BlackKnight, and Grip-Rite provide broad roll coverage with mechanical attachment; ZIP instead prioritizes a bonded layer and nail-seal protection. The slip-resistant surface supports installation handling, but the supplied product data does not specify roll coverage or a UV exposure period, so I would not choose it based on assumptions about either. Its 30-year Leak-Free Guarantee is conditional: the underlayment must be used with compatible ZIP System sheathing and tape. That system requirement narrows its fit and can make it unsuitable for buyers working with other roof decks or seeking a general-purpose synthetic roll.
Pros:- Rubberized asphalt creates a waterproof, self-adhering barrier.
- Designed for full roof decks, including vulnerable eaves and valleys.
- Nail-seal protection helps limit water entry around fasteners.
- Slip-resistant surface supports installation handling.
Cons:- The 30-year Leak-Free Guarantee depends on compatible ZIP System sheathing and tape.
- Product data supplied here does not state roll coverage or a UV exposure period.
Best for: Builders installing compatible ZIP System sheathing and tape who want a self-adhering, nail-sealing membrane for roof decks, eaves, and valleys.
Not ideal for: Roofers working with non-ZIP sheathing who want a mechanically fastened synthetic roll or a guarantee independent of other system components.
- Manufacturer:Huber Engineered Woods
- Part number:S-20036
- Material:Rubberized asphalt
- Model:Standard Temp
- Item weight:51 lb
- Product dimensions:10 x 10 x 38 in.
- Package quantity:1
- Color:Black adhesive with dark gray backer
Our verdict“Choose ZIP System when you need a bonded nail-seal membrane and are installing the compatible sheathing-and-tape system required for its guarantee.”
ApxRoufin Synthetic Roofing Underlayment, 48 in x 250 ft
The ApxRoufin stands out for pairing 1,000-square-foot coverage with compatibility across metal, shingle, and tile roofs. Its four-layer polypropylene construction is designed to resist tearing, wind, UV exposure, and fire, while a vapor-permeability rating of 0.12 perms allows some moisture vapor to pass through. Compared with the similarly sized Interwrap UDL25, the listed ApxRoufin details make its vapor permeability and Class A fire rating explicit, which may help buyers compare specifications. It also allows up to 90 days of exposure, giving crews more scheduling flexibility than a short-exposure product. The tradeoff is that it is specified for slopes of 2:12 or steeper, so it is not a fit for flatter roofs. Its performance claims do not remove the need to check local code and roof-system requirements.
Pros:- Covers 1,000 sq ft per roll, reducing the number of rolls needed for larger roof areas.
- Compatible with metal, shingle, and tile roofing.
- Vapor permeability is specified at 0.12 perms under ASTM E96.
- Designed for up to 90 days of UV exposure and carries an ASTM E108 Class A fire-resistance rating.
Cons:- Specified for roof slopes of 2:12 or steeper, limiting use on low-slope roofs.
- The roll weighs 18.36 lb, which may be less convenient to handle than a lighter roll.
- Product data alone does not establish suitability for every roof assembly or local code requirement.
Best for: Roofers and homeowners choosing one synthetic underlayment for a metal, shingle, or tile roof with a slope of at least 2:12, especially when installation may remain exposed for several weeks.
Not ideal for: Owners of roofs below a 2:12 slope, or buyers who need a peel-and-stick membrane for a self-adhered installation.
- Dimensions:48 in x 250 ft
- Coverage:1,000 sq ft
- Material:Polypropylene; four-layer construction
- Roof compatibility:Metal, shingle, and tile roofs
- Minimum roof slope:2:12
- Vapor permeability:0.12 perms (ASTM E96)
- UV exposure resistance:Up to 90 days
- Fire resistance:ASTM E108 Class A
- Weight:18.36 lb
Our verdict“Choose ApxRoufin if you need broad roof-covering compatibility, a full 1,000-square-foot roll, and up to 90 days of stated exposure protection on a roof sloped at least 2:12.”
How We Picked
I compared the 11 listed products on buyer-relevant details: underlayment type, roll dimensions and stated coverage, installation approach, and how clearly each option fits a particular roofing task. I gave greater weight to products that appear suited to a recognizable use, such as a general synthetic roll or a self-adhering layer, while treating premium positioning and product names as claims to verify rather than proof of performance.
The order reflects usefulness across common residential projects first, then narrower strengths. DuPont Roof Protector leads as the most balanced general-purpose choice in this lineup; adhesive options rank for the specific jobs their installation style may suit, not as automatic upgrades. Products with fewer distinguishing details rank below options with a clearer role, but that does not establish weaker performance. Before purchase, I would confirm the current manufacturer data sheet, local code requirements, roof-system compatibility, and installation instructions.
Factors to Consider When Choosing Best Roof Underlayment
Choosing underlayment starts with the roof assembly and installation conditions, not a label like “professional grade.” I use these checks to narrow the field before comparing roll formats or ordering material.
Match the underlayment to the roof system and local rules
Underlayment is one part of a roof assembly, so confirm that the product is approved for the roof covering, deck, and slope you have. Local codes may specify material types, overlap, or extra protection in particular areas. A product suitable beneath asphalt shingles may not be the right match for metal roofing or another covering. Ask the roofer or building official which standards apply before buying. Do not assume a broad product description means the material is accepted for every roof. This check can prevent ordering a roll that cannot be used in the planned assembly.
Choose between a mechanically fastened roll and an adhesive layer
Most products in this roundup are synthetic rolls installed with specified fasteners, while Grip-Rite HT and ZIP System are peel-and-stick choices. Adhesion can suit details where a bonded layer is called for, but it also makes surface preparation and placement technique more consequential. Confirm whether the deck needs to be clean, dry, or primed, and check the permitted application temperature. For a large, straightforward roof, a conventional roll may be easier to position and adjust. Avoid substituting installation styles without checking the roofing system instructions.
Calculate usable coverage, seams, and handling before ordering
Compare the stated roll dimensions and coverage rather than relying on roll length alone. Roof area is larger than the building footprint, and valleys, hips, eaves, penetrations, and required overlaps add material use. Wider rolls may reduce seam count but can be harder for one installer to manage in wind or on a steep slope. A different width, such as DuPont’s 42-inch format, can also affect layout and waste compared with 4-foot rolls. Sketching the roof planes and checking the manufacturer’s overlap rules gives a more reliable order estimate. Leave room for cuts and damaged sections instead of planning to use every inch.
Check exposure limits and weather timing
Underlayment may be exposed to sun and weather between installation and the final roof covering, but allowed exposure periods vary by product. If the roofing crew cannot cover the deck promptly, verify the product’s exposure limit in its current technical documentation. Also plan for wind, rain, and temperature during installation; exposed rolls and adhesive materials can behave differently as conditions change. Do not treat “waterproof” or “synthetic” as a promise that a product can remain uncovered indefinitely. A schedule that leaves the roof open longer than the stated limit may call for a different material or a revised work plan.
Pay for a feature only when the job needs it
A self-adhering product can make sense where the roof design or project specification calls for a bonded layer, but it may add preparation and installation demands that a basic synthetic roll avoids. Conversely, choosing a conventional roll solely for simpler handling can be a poor fit if the roof requires an adhesive underlayment. Compare the full installation requirements, including accessories and compatible flashing details, rather than judging by the roll alone. Ask who will install the material and whether that crew is familiar with the chosen system. The right upgrade is the one that solves a defined project need, not simply the one with the most assertive product name.
Frequently Asked Questions
Can I use a synthetic underlayment instead of felt under shingles?
Often, synthetic underlayments are used beneath shingles, but suitability depends on the roofing system, roof slope, local code, and the product’s installation instructions. Check that the selected product is approved for your shingle type and deck. Fastener type, spacing, and overlap rules can differ from felt, so do not carry over an old installation method without checking. If a contractor is installing the roof, ask them to confirm the material against the project specification. Code acceptance should be verified for your location before purchase.
When should I choose peel-and-stick underlayment over a standard synthetic roll?
Choose peel-and-stick when the roof design, project specification, or required detail calls for an adhesive layer. It can be a useful fit for selected roof areas, but the full-deck application decision should follow the manufacturer’s instructions and local requirements. Surface condition and application temperature affect installation, so check those limits before work begins. A standard synthetic roll may be easier to lay across a broad area when no adhesive layer is required. Do not assume the adhesive option is automatically better for every roof.
How much roof underlayment should I order?
Start with the measured area of each roof plane, not the building’s floor area, then account for overlaps, cuts, and roof details. Valleys, hips, ridges, eaves, and penetrations can increase material use, and the required allowance depends on the installation method. Use the product’s stated coverage and overlap instructions to estimate how much area each roll will actually cover. Roll widths also affect layout and waste, so compare dimensions across products before ordering. If measurements are uncertain, have the installer calculate the quantity from the roof plan.
Can roof underlayment stay exposed while I wait for shingles?
Only for the exposure period stated by the product manufacturer. Sun, rain, wind, and site conditions can affect how long an underlayment remains suitable before the roof covering goes on. Check the current technical sheet rather than relying on a general claim about synthetic material or water resistance. If weather or scheduling may delay shingle installation, tell the roofer before selecting the product. A short exposure allowance may be a poor match for a project with an uncertain covering date.
Do I need one underlayment across the whole roof, or can I use different products?
Some roof designs and specifications use different materials in different areas, but transitions between products need to follow the roofing system instructions. Confirm that the materials are compatible with the deck, roof covering, and each other, and that required overlaps and details are clear. Mixing products without a planned detail can create installation gaps or complicate warranty requirements. Ask the roofer to identify where each material will go and why. If the project documents call for a continuous product, follow that specification rather than making substitutions on site.
Conclusion
For the best overall choice, I would start with DuPont Roof Protector for a standard project seeking a synthetic roll with a distinctive coverage format. For adhesive-focused needs, compare Grip-Rite ShingleLayment HT and ZIP System against the roof’s installation requirements and temperature conditions; neither should be treated as a universal upgrade. For value, I would compare the standard synthetic rolls by usable coverage and verified specifications, rather than choosing from the product name alone. For beginners, a straightforward synthetic roll is generally easier to plan than a peel-and-stick system, though the installer’s guidance and product instructions should lead. If your roof has unusual details, a long exposure window, or strict project specifications, choose the product that matches those needs and confirm code acceptance before ordering.
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