Roofing underlays
LETO 145 is a BBA-certified, vapour-permeable roofing underlay developed for pitched roof applications where increased strength and durability are required. Manufactured from a robust three-layer polypropylene construction, it delivers enhanced tensile performance, W1 water resistance and excellent vapour-permeability, helping to protect the roof structure while reducing the risk of condensation. Suitable for warm and cold roof constructions, LETO 145 offers a balance of strength, performance and value for a wide range of residential and commercial roofing projects.
| Weight, gsm | 145 |
|---|---|
| Resistance to water penetration, Class | W1 |
| Water vapour transmission (Sd), m | 0.02 |
| Tensile strength (MD/CD), N/50mm | 300 / 200 |
| Elongation at max. tensile force (MD/CD), % | 60 / 100 |
| 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 | Grey |
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