Roofing underlays
LETO 125 is a BBA-certified, vapour-permeable roofing underlay designed for modern pitched roof construction. Manufactured from a durable three-layer polypropylene construction, it provides dependable weather protection, excellent breathability and W1 water resistance, helping to reduce the risk of condensation while protecting the roof structure from external moisture. Suitable for warm and cold roof applications, LETO 125 combines straightforward installation, reliable performance and excellent value for everyday roofing projects.
| Weight, gsm | 125 |
|---|---|
| Resistance to water penetration, Class | W1 |
| Water vapour transmission (Sd), m | 0.02 |
| Tensile strength (MD/CD), N/50mm | 280 / 155 |
| Elongation at max. tensile force (MD/CD), % | 70 / 60 |
| 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 | Blue |
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