Description
The WonderBuilds 4kg Sanded Underlay is a premium waterproofing membrane designed for multi-layer roofing systems. Measuring 8m x 1m, this underlay features fiberglass reinforcement, offering exceptional dimensional stability and durability. Ideal for both new builds and refurbishments, it provides reliable waterproofing with a flow resistance of 120°C and low-temperature flexibility at -10°C.
Easily applied using torch-on methods, this SBS-modified bitumen-coated underlay is suitable for a wide range of substrates. Combining high performance with environmental responsibility, the WonderBuilds 4kg Sanded Underlay is a cost-effective and dependable solution for all your roofing needs.
Why Choose this WonderBuilds 4kg A Film Underlay 8m x 1m?
- High-performance waterproofing solution
- Fibreglass reinforcement
- Quick & easy installation
- Strong & durable
- Cost-effective
Product Specifications:
Roll Dimensions: 8m x 1m
Material: SBS modified bitumen / fibreglass reinforcement
Weight (kg/m²): 4
Cold Flexibility (°C): -10
Flow Resistance (°C): +120
Tensile Strength (N/50mm): 500 (LD) / 400 (TD)
Elongation at Break (%): 35 (LD) / 35 (TD)
Resistance to Tearing (N): 150 (LD) / 150 (TD)
Dimensional Stability (%): -0.5
External Fire Performance: F Roof
Reaction to Fire: Class F
Watertightness (kPa): 60
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