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Pitched Roofing Breathable Underlayment Membrane Building Wrap Housewrap T180 is a breathable waterproof membrane designed for pitched roofs. It is used to provide waterproofing, breathability and ventilation functions. It is suitable for roof systems to help prevent moisture accumulation and rainwater penetration, improving the durability and comfort of buildings.
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Waterproof Breathable Membrane
Pitched Roofing Breathable Underlayment Membrane Building Wrap Housewrap T180
Product Details
T180 BREATHABLE UNDERLAYMENT
Pitched Roofing Breathable Underlayment Membrane Building Wrap Housewrap T180
Nonwoven Fabric + PE Film · 3 layer · SD 0.02±0.015
The Pitched Roofing Breathable Underlayment Membrane T180 is a three-layer composite made from nonwoven fabric and polyethylene film, designed for use as a breathable underlayment, building wrap, or housewrap in pitched roof and wall assemblies. With an SD value of 0.02±0.015, the membrane permits controlled moisture vapour diffusion while maintaining Class W1 water penetration resistance. Its mass per unit area is approximately 180 g/m², giving the roll a substantial body for stable placement across rafters and sheathing. Tensile strength is specified at MD 330±40 N/50mm and CD 250±40 N/50mm, with elongation values of MD 80±80 N/50mm and CD 95±65 N/50mm. UV resistance is rated at 3 months, supporting temporary exposure during construction. Standard roll dimensions are 1.5 x 50 m, with custom sizes and colors available upon request. The membrane is suitable for pitched roof underlayment, timber-frame wall wrap, and building envelope applications where vapour permeability and liquid water resistance are both required.
SD Value 0.02±0.015
Weight 180 g/m²
Tensile MD 330 N/50mm
Tensile CD 250 N/50mm
UV Resistance 3 months
01
Core Advantages
- SD value of 0.02±0.015 supports controlled vapour diffusion, reducing the likelihood of trapped moisture while retaining Class W1 liquid water resistance.
- Approximately 180 g/m² mass per unit area provides a defined sheet weight for stable positioning on pitched roof decks and wall framing.
- Tensile strength of MD 330±40 N/50mm and CD 250±40 N/50mm offers directional mechanical performance for installation and service conditions.
- Elongation values of MD 80±80 N/50mm and CD 95±65 N/50mm indicate the membrane can accommodate moderate substrate movement.
- 3-month UV resistance and custom color options support flexible scheduling during phased construction.
- Standard 1.5 x 50 m rolls with custom dimensions available for varying project requirements.
02
Application Scenarios
Pitched Roof Underlayment Placed beneath tiles, slates, or metal coverings to manage vapour and resist water ingress.
Wall Breather Wrap Used behind cladding in timber-frame, steel-frame, or masonry wall systems.
Temporary Weather Cover Provides short-term protection during construction within the 3-month UV exposure window.
Building Envelope Assembly Applied where vapour control and liquid water resistance are specified together.
Product Characteristics
Material Nonwoven Fabric + PE Film
SD Value 0.02 ± 0.015
Weight per Unit Area Approx. 180 g/m²
Dimensions 1.5 x 50 m (Custom)
Construction 3 layers
Water Penetration Resistance Class W1
Tensile Strength MD/CD 330±40 / 250±40 N/50mm
Elongation MD/CD 80±80 / 95±65 N/50mm
UV Resistance 3 months
Color Custom
Frequently Asked Questions
expand all 01 What does the SD value of 0.02±0.015 mean for this underlayment?
The SD value represents the water vapour diffusion resistance of the membrane. At 0.02±0.015, the material has a low diffusion resistance, allowing moisture vapour to migrate through while still providing Class W1 resistance to liquid water. This balance helps reduce condensation risk within pitched roof and wall assemblies.
02 How does the 180 g/m² weight affect installation?
A mass per unit area of approximately 180 g/m² gives the membrane a moderate body that helps it lie flat and resist wind uplift during installation. It remains manageable for manual handling while providing enough substance for stable placement across rafters and sheathing.
03 Can this membrane serve as both a roof underlayment and a wall wrap?
Yes. The product is designed for use in pitched roof underlayment as well as wall breather applications, including building wrap and housewrap roles. The combination of vapour permeability and Class W1 water resistance supports both functions within a building envelope.
04 What happens if the membrane is exposed beyond 3 months?
The UV resistance rating of 3 months indicates the period during which the membrane can be exposed to sunlight without significant degradation of its stated properties. Exposure beyond this timeframe is not recommended, and the final roof covering or cladding should be installed within the specified window.
05 Are custom dimensions and colors available?
Custom dimensions and colors can be arranged on request. The standard roll size is 1.5 x 50 m. Lead times and minimum order quantities may apply depending on the specification. Please contact the supplier for detailed customization options.
Technical Specifications
| Material | Nonwoven Fabric + PE Film |
| SD Value | 0.02 ± 0.015 |
| Weight per Unit Area | Approx. 180 g/m² |
| Dimensions | 1.5 x 50 m (Custom) |
| Construction | 3 layers |
| Water Penetration Resistance | Class W1 |
| Tensile strength (MD) | 330 ± 40 N/50mm |
| Tensile strength (CD) | 250 ± 40 N/50mm |
| Elongation (MD) | 80 ± 80 N/50mm |
| Elongation (CD) | 95 ± 65 N/50mm |
| UV Resistance | 3 months |
| Color | Custom |
Industry Applications
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