Breathable Roofing Felt
Breathable roofing felt has become the invisible guardian of modern roof structures, solving the critical issue of trapped moisture that silently destroys homes. In traditional setups, warm air from inside the house rises and condenses under cold roof tiles, leading to rotting timbers and moldy insulation.
A high-performance roofing felt acts as a one-way valve: it blocks external rain and wind-driven snow from entering while allowing internal water vapor to escape freely. This continuous airflow is physically vital, keeping wood rafters dry and maintaining the thermal efficiency of insulation, which can degrade by up to 30% if damp.
The data behind this technology is compelling. Building science studies show that roofs equipped with breathable membranes reduce the risk of structural timber decay by over 90% compared to non-breathable alternatives. By preventing condensation buildup, these systems help maintain consistent indoor temperatures, potentially lowering heating bills by 15% in colder climates due to dry, effective insulation.
Beyond physics, the practical benefits are massive. Modern breathable roofing felt is incredibly lightweight and flexible, allowing installers to cover complex roof shapes quickly without heavy machinery.
Its high tensile strength means it can often serve as a temporary weather shield, letting builders proceed with tiling even in unpredictable weather. Unlike older bitumen sheets that become brittle and crack, today's roofing felt remains flexible for decades, ensuring a durable, dry, and energy-efficient roof envelope that protects the entire building structure from the inside out.
Product Paramters
| Feature | Specification | Core Benefits |
| Dimensions | Width: 1.0m / 1.5m | The 1.5m width significantly reduces horizontal overlaps on roofs, speeding up installation and minimizing leak risks. The 1.0m width is ideal for narrow spaces or small shed repairs. |
| Roll Length: 50m / 100m (Customizable) | ||
| Material Structure | Base: 100% Virgin Polyethylene (PE) + Microporous Breathable Film | Multi-layer co-extrusion using no recycled materials. PE base provides exceptional flexibility in cold weather and superior resistance to acids/alkalis compared to PP, ensuring long-term durability. |
| Weight: 80g/m² – 150g/m² (Optional) | ||
| Waterproof Performance | Hydrostatic Head: ≥ 2000mm H₂O | Effectively withstands heavy rain, snow, wind, and hail. Prevents liquid water from penetrating insulation or timber frames, ensuring the roof interior stays dry in harsh weather. |
| Description: Superior Surface Water Repellency | ||
| Breathability | Water Vapor Resistance (SD Value): ≤ 0.02m – 0.05m | Extremely low vapor diffusion resistance. Acts as the building's "breathing skin," rapidly expelling indoor humidity to prevent condensation, mold growth, and timber rot. |
| Moisture Transmission: ≥ 1500 g/m²·24h | ||
| Physical Strength | Tensile Strength: MD ≥ 180 N/5cm, CMD ≥ 130 N/5cm | High-toughness design withstands temporary foot traffic during construction, strong wind loads, and structural thermal expansion/contraction without rupturing. |
| Tear Strength: ≥ 25 N (Trapezoid Method) | ||
| Weather Resistance | UV Stability: Safe for Exposure for 2–3 Months | Can be safely exposed to sunlight for 2–3 months before installing outer cladding (tiles/metal) without degrading or powdering. Provides ample buffer for construction schedules in extreme cold or heat. |
| Temperature Range: -40°C to +80°C | ||
| Safety & Eco-Friendliness | Non-Toxic, Odorless, Asbestos-Free | Green building material with no harmful emissions during production. Safe for occupants; select models are recyclable. |
| Installation Accessories | Specialized Breathable Waterproof Tape / Fixing Nail Washers | Used with dedicated accessories to ensure airtight and watertight overlaps, creating a complete, continuous protective system. |
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