Underlayment & Barriers

Protect your home or building with underlayment and water-resistant but vapor permeable barriers. Building underlayment is usually used when working on roofs and external walls to provide a barrier on the inside of the construction work in case your house siding is not water-tight or your roof tiles are not moisture resistant. 

Our range of building underlayment includes specialty insulated or woven reinforced vapor barriers for crawl spaces and smaller areas especially common in roof and attic construction work. As well as specialty synthetic roofing underlayment to protect the construction of the roof and keep moisture, vapors, and any weather damage to the roof tiles out of the structure.

For underlayment and barrier insulation and reinforcement for walls and sheds take a look at our selection of poly sheeting, underslab vapor barriers, as well as pipe boot and patch. Flashing, adhesives, and sealants are also available to stock up on accessories and must-have products to complete the job. You will find underlayment and barrier brands that have become house names such as Viper, Aluf Plastics, and our very own Roofing4US. 

Browse below to find underlayment or vapor barrier products for your project and contact one of our team members via Live Chat if you have any questions about the products or which underlayment to choose for your specific project.

TPO Plus Roof Membranes - All Sizes
TPO Plus Roof Membranes - All Sizes Flex Membranes
Vendor
Roofing4US
Regular price
from $437.50
Sale price
from $437.50
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Unit price
per 
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TPO Plus Self Adhered Roof Membranes - All Sizes
TPO Plus Self Adhered Roof Membranes - All Sizes Flex Membranes
Vendor
Roofing4US
Regular price
from $1,360.00
Sale price
from $1,360.00
Regular price
Unit price
per 
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Viper CS 10 mils Crawl Space Class A Woven Reinforced Vapor Barrier - Full Range
Viper CS 10 mils Crawl Space Class A Woven Reinforced Vapor Barrier
Vendor
Viper
Regular price
from $225.16
Sale price
from $225.16
Regular price
Unit price
per 
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Viper II Underslab Vapor Barrier Class A - Full Range
Viper II Class A 15-mil
Vendor
Viper
Regular price
$441.61
Sale price
$441.61
Regular price
Unit price
per 
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Insul-Barrier Crawl Space Vapor Barrier - 4 ft x 25 ft
Insul-Barrier Crawl Space Vapor Barrier
Vendor
Insul Barrier
Regular price
$97.06
Sale price
$97.06
Regular price
Unit price
per 
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Viper CSX Radiant Crawl Space Vapor Barrier - Full Range
Viper CSX Radiant Crawl Space Vapor Barrier
Vendor
Viper
Regular price
from $303.69
Sale price
from $303.69
Regular price
Unit price
per 
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Perforated Radiant Barrier Industrial Grade Reflective Insulation Foil - All Sizes
Radiant Barrier Industrial Grade Perforated Reflective Insulation Rolls - All Sizes Attic Insulation
Vendor
Super R
Regular price
from $86.88
Sale price
from $86.88
Regular price
Unit price
per 
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Grayhawk Synthetic Underlayment - All Sizes
Vendor
Gray Hawk
Regular price
$48.70
Sale price
$48.70
Regular price
Unit price
per 
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Viper CS 6.5 mils Crawl Space Class A Woven Reinforced Vapor Barrier - Full Range
Viper CS 6.5 mils Crawl Space Class A Woven Reinforced Vapor Barrier
Vendor
Viper
Regular price
from $159.13
Sale price
from $159.13
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Unit price
per 
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Synthetic Roofing Underlayments EXO25-SB (Pallet of 42 Rolls)
Synthetic Roofing Underlayments Stringer EXO25-SB
Vendor
National Nail
Regular price
$2,779.98
Sale price
$2,779.98
Regular price
Unit price
per 
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Insul-Tarp Under Slab Insulation 1/2 In - All Sizes
Insul-Tarp Under Slab Insulation 1/2 In
Vendor
Insul-Tarp
Regular price
from $0.00
Sale price
from $0.00
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per 
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Diamond Perforated Radiant Barrier Reflective Insulation Foil - All Sizes
Super Radiant Barrier Perforated Diamond Insulation Rolls
Vendor
Super R
Regular price
from $61.88
Sale price
from $61.88
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Unit price
per 
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Non-Perforated Radiant Barrier Super R Plus Reflective Insulation Ag Barrier - All Sizes
Super Radiant Barrier Solid Reflective Insulation Ag Barrier - All Sizes Attic Insulation
Vendor
Super R
Regular price
from $86.88
Sale price
from $86.88
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Unit price
per 
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Aluminum Liner Tape 2 in x 150 ft
Aluminium Liner Tape 2 in x 150 ft Tape
Vendor
Roofing4US
Regular price
$18.75
Sale price
$18.75
Regular price
Unit price
per 
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Cetainteed MemBrain Vapor Retarder - All Sizes
Cetainteed MemBrain Vapor Retarder - All Sizes
Vendor
Certainteed
Regular price
from $197.00
Sale price
from $197.00
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Unit price
per 
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Raptor Underlayment - All Sizes
Vendor
Raptor
Regular price
$3,360.00
Sale price
$3,360.00
Regular price
Unit price
per 
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StarWrap Superior Synthetic Felt Underlayment 4 ft x 250 ft
StarWrap Superior Synthetic Felt Underlayment 4 ft x 250 ft 10sq
Vendor
StarWrap
Regular price
from $2,720.00
Sale price
from $2,720.00
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Unit price
per 
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Wraptor House Wrap Tape 2 in x 216 ft (36 Rolls)
Vendor
Wraptor
Regular price
$341.36
Sale price
$341.36
Regular price
Unit price
per 
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Wraptor Building HP House Wrap 11 perm - Full Range
Wraptor HP Building House Wrap 11 perm - Viper
Vendor
Wraptor
Regular price
from $110.81
Sale price
from $110.81
Regular price
Unit price
per 
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Wraptor Building House Wrap 5 perm - Full Range
Wraptor HP Building House Wrap 5 perm - Viper
Vendor
Wraptor
Regular price
from $0.00
Sale price
from $0.00
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Unit price
per 
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Synthetic Roofing Underlayments EXO50 4 ft x 250 ft (Pallet of 42)
Synthetic Roofing Underlayments Stringer EXO50
Vendor
National Nail
Regular price
$3,951.24
Sale price
$3,951.24
Regular price
Unit price
per 
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Viper Venom Barrier Class A 16 ft x 100 ft x 20 mils
Viper Venom Barrier 20mm Class A 16 ft x 100 ft Grey/Black
Vendor
Viper
Regular price
$638.75
Sale price
$638.75
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Unit price
per 
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Viper VaporCheck 12 ft x 200 ft - All Thicknesses
Viper I Class A 12 ft x 200 ft Orange
Vendor
Viper
Regular price
from $0.00
Sale price
from $0.00
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per 
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Viper Vapor Patch 11.5 In x 50 ft Pipe Boot and Patch (5 Rolls)
Vendor
Viper
Regular price
$380.94
Sale price
$380.94
Regular price
Unit price
per 
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Viper Vapor Scrim Reinforced Poly Sheeting - Full Range
Viper Vapor Scrim 6-mil & 10-mil
Vendor
Viper
Regular price
from $3,770.82
Sale price
from $3,770.82
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Unit price
per 
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Viper II Underlslab Vapor Barrier Class C 14 ft x 210 ft - Full Range
Viper II Class C 14' x 210' - 6-mil
Vendor
Viper
Regular price
from $322.79
Sale price
from $322.79
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Unit price
per 
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Viper II Platinum Under Slab Vapor Barrier Class A 14 ft x 210 ft x 8 mils
Viper II Platinum 8-mil Class A 14' x 210' Silver
Vendor
Viper
Regular price
$361.75
Sale price
$361.75
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Unit price
per 
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20 ft x 100ft x 6mm Poly Sheeting (25 Rolls)
PS201006 Extra Strong 4 mil 20ft Poly Sheeting - Aluf Plastics
Vendor
Aluf Plastics
Regular price
$1,883.13
Sale price
$1,883.13
Regular price
Unit price
per 
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20ft x 100ft x 4mm Poly Sheeting (25 Rolls)
PS201004 Extra Strong 4 mil 20ft Poly Sheeting - Aluf Plastics
Vendor
Aluf Plastics
Regular price
$1,031.88
Sale price
$1,031.88
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Unit price
per 
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12ft x 100ft x 6mm Poly Sheeting (36 Rolls)
PS121006 Extra Strong 6 mil 12ft Poly Sheeting - Aluf Plastics
Vendor
Aluf Plastics
Regular price
$1,337.40
Sale price
$1,337.40
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Unit price
per 
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10ft x 100ft x 6mm Poly Sheeting (36 Rolls)
PS101006 10ft wide Poly Sheeting - Aluf Plastics
Vendor
Aluf Plastics
Regular price
$1,114.65
Sale price
$1,114.65
Regular price
Unit price
per 
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10ft x 100 ft x 4mm Poly Sheeting (36 Rolls)
PS101004 10ft wide Poly Sheeting - Aluf Plastics
Vendor
Aluf Plastics
Regular price
$777.60
Sale price
$777.60
Regular price
Unit price
per 
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Welcome to the comprehensive world of Underlayment & Barriers at Roofing4Us, where we believe that protecting your building from the elements begins underneath the visible layer of your construction. Dive into the diverse array of products and their core functionalities to achieve optimal protection against vapor, excess moisture, and other environmental elements across various applications.

Synthetic Roofing Underlayments

Underlayment provides a secondary weather barrier to guard the roof deck from moisture penetration, serving a pivotal role in preserving the structural integrity of your roof.

  • Raptor, Gray Hawk, and StarWrap offer a wide selection of Synthetic Underlayments, all available in various sizes to cater to diverse roofing needs. From National Nail, we also have Synthetic Roofing Underlayments EXO50 and EXO25-SB. These products provide superior water resistance and durability, ensuring robust and long-lasting protection beneath shingles, tiles, or other roofing materials.

     

Vapor Retarders

An essential tool to manage and mitigate the movement of moisture through walls and prevent potential damage to the structure.

  • CertainTeed MemBrain Vapor Retarder is a versatile wall lining that can adapt its permeability to the ambient humidity level, providing enhanced protection against moisture, mold, and mildew.

     

Crawl Space Vapor Barriers

Securing your crawl spaces from moisture infiltration is paramount to prevent the onset of mold, mildew, and structural decay.

  • Products like Viper CS, Viper CS II, and Viper CSX Radiant offer a range of Class A Vapor Barriers, available in multiple sizes and thicknesses, designed to robustly resist the ingress of moisture from the ground into the crawl spaces, thereby safeguarding the foundational structures of buildings.

     

House Wraps and Tapes

Strategically designed to add an additional layer of protection to walls against external weather conditions.

  • Wraptor presents a variety of House Wraps with different permeability levels and the House Wrap Tape to secure these wraps in place, thereby ensuring a tight seal against air and moisture infiltration through external walls.

     

Under Slab Vapor Barriers and Insulation

Mitigating moisture migration and providing foundational thermal insulation is fundamental in enhancing the longevity and energy efficiency of your construction.

  • Products like Viper II Underlslab Vapor Barrier and Insul-Tarp Under Slab Insulation provide a critical line of defense against ground moisture, protecting foundational slabs from potential damage while maintaining a consistent internal environmental quality.

     

Poly Sheeting

A versatile and flexible solution for creating temporary barriers, covering materials, and enclosing spaces during construction.

  • Aluf Plastics and Nu-Age offers a plethora of Poly Sheeting options, available in various sizes and thicknesses, suitable for multifaceted applications, including temporary weather protection during construction, creating vapor barriers, and more.

     

Selecting the Right Product

Choosing the right underlayment or barrier is contingent upon several factors your geographical location, the environmental conditions typically encountered, the type of your construction, and specific building codes that might be applicable. While synthetic underlayments might be a staple for roofing applications:

  • For High Humidity Environments: Consider vapor retarders like CertainTeed MemBrain that adapts to humidity levels.
  • For Ground Level Applications: Leverage the strength of Viper vapor barriers and Insul-Tarp under slab insulation to guard against ground moisture.
  • For Wall Applications: Wraptor house wraps and tapes provide a shield against external weather, whereas Nu-Age and Aluf Plastics poly sheeting can serve as a temporary barrier during construction phases.

     

We invite you to navigate through our extensive product range, explore individual product details, and make informed choices that align with your specific requirements and use cases. Your path to a secure and durable structure is paved with the quality and reliability of our underlayment and barrier offerings at Roofing4Us.

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