Roofing underlays
LETO 175 is a BBA-certified, high-performance vapour-permeable roofing underlay designed for demanding pitched roof applications. Manufactured from a durable three-layer polypropylene construction, it combines superior strength, excellent vapour-permeability and W1 water resistance to provide dependable protection against wind-driven rain and external moisture. Suitable for warm and cold roof constructions, LETO 175 is the ideal choice where enhanced durability and technical performance are required without compromising ease of installation.
| Weight, gsm | 175 |
|---|---|
| Resistance to water penetration, Class | W1 |
| Water vapour transmission (Sd), m | 0.02 |
| Tensile strength (MD/CD), N/50mm | 350 / 240 |
| Elongation at max. tensile force (MD/CD), % | 70 / 70 |
| Nail tear resistance (MD/CD), N/50mm | ≥50 / ≥50 |
| Flexibility at low temperature | -40°C |
| UV stability, Months | 3 |
| Reaction to fire, Class | E |
| Colour | Green |
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