Breathable Membrane for Shed Roof
We designed this breathable membrane to work like a high-performance skin. It's not just a plastic sheet; it's a thermal-bonded system that allows water vapor to escape from the inside while staying 100% watertight against external rain. Whether it's a garden office or an agricultural barn, this layer keeps the roof timbers dry 365 days a year. No sweating, no mold, no structural rot.
A lot of cheap membranes on the market use recycled polypropylene to cut costs, but they turn to powder after a few years of UV exposure. At our factory, we use 100% virgin materials (2 layers of high-strength Polypropylene + 1 layer of Microporous Polyethylene). This 3-layer co-extrusion means the membrane stays flexible at -40°C and won't melt or degrade at 80°C. It's built to outlast the outer roofing material itself.
It costs more than basic bitumen felt. But let's look at the numbers. Replacing a rotted timber roof frame every 7 years is a nightmare. By investing in a 120g/sqm breathable underlay, owners save in repair costs over the next decade. Plus, our material has a high hydrostatic head (≥2000mm), so even during a heavy storm before the tiles go on, your interior stays bone dry.
Protecting Your Assets By choosing a quality breathable membrane, you are doing more than just covering a roof. You are making a performance-backed investment in the longevity of your building. Whether you are protecting expensive tools in a workshop or livestock in a shed, this membrane provides a reliable, decades-long safeguard for your most valuable assets.
Product Paramters
| Feature | Specification |
| Dimensions | Width: 1.0m / 1.5m |
| Roll Length: 50m, 100m, 150m (Customizable) | |
| Material Structure | 100% Virgin Polyproplene (PP) + Polyethylene (PE) |
| Weight: 80gsm - 220gsm (Customizable) | |
| Waterproof Performance | Hydrostatic Head: ≥ 1500mm - 3000mm |
| Description: Superior Surface Water Repellency | |
| Breathability | Water Vapor Resistance (SD Value): ≤ 0.02m – 0.05m |
| Moisture Transmission (BS 3117): ≥ 300g/m²·24h - 800g/m²·24h | |
| Physical Strength | Tensile Strength: MD ≥ 120N - 350N, CD ≥ 80N - 225N |
| Tear Strength: ≥ 25N (Trapezoid Method) | |
| Weather Resistance | UV Stability: Safe for Exposure for 6 Months |
| Temperature Range: -40°C to +80°C | |
| Safety & Eco-Friendliness | Non-Toxic, Odorless, Asbestos-Free |
| Fire resistance DIN 4102 | E |
| Installation Accessories | Specialized Breathable Waterproof Tape / Fixing Nail Washer |
FAQ
Q1: Can I use breathable membrane instead of traditional bitumen felt on a shed roof?
A: Absolutely. While traditional bitumen felt is a common cheap option, it is non-breathable and often traps moisture inside, leading to timber rot over time. Our 120g breathable membrane acts as a superior alternative by providing 100% waterproofing against rain while allowing internal water vapor to escape. It is significantly lighter, easier to install, and extends the lifespan of your shed's roof structure by up to 15 years compared to standard felt.
Q2: How does a breathable membrane prevent condensation in garden sheds and workshops?
A: Condensation is the "silent killer" of outdoor buildings, especially when used as home offices or workshops. Our membrane features a high-tech microporous inner film that acts as a one-way valve. It blocks liquid water from entering but allows humidity from the air inside to pass through. By maintaining this constant vapor diffusion, you prevent the mold growth and "sweating" that typically ruins tools, equipment, and insulation.
Q3: What is the recommended overlap and installation method for shed roofing?
A: For maximum protection, we recommend a horizontal overlap of at least 150mm. On lower-pitched roofs (below 15°), increasing the overlap to 200mm is advisable. For the best wind-tight performance, especially in coastal or high-wind areas, we suggest sealing the overlaps with specialized waterproof tape. Our membrane's high tensile strength (MD ≥ 180 N) ensures it won't tear during stapling or nailing to the timber rafters.
Q4: Is this membrane UV-resistant if the outer roofing installation is delayed?
A: Yes. We understand that construction schedules can change. Our shed roof membranes are manufactured from 100% virgin polypropylene with UV stabilizers, allowing for safe exposure to direct sunlight for 2 to 3 months. Unlike recycled materials that can become brittle and powder under UV light, our virgin PE/PP layers maintain their structural integrity and waterproofing performance even in extreme temperatures ranging from -40°C to +80°C.
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