Metra zero
brevetto patent
Breathable and waterproofing underlay
BREATHABLE
ULTRASONIC WELDING
RECYCLABLE
WATERPROOFING
WIND BARRIER
ROOF + WALL
Highly breathable underlay composed by 3 layers in polypropylene welded with ultrasonic technology. The absence of glues and harmful substances makes the product competely recyclable with high breathable properties. Stabilized against UV rays. It has antiskid properties too.
Placed in direct contact with the thermal insulation on the cold side of the structure, it allows a rapid evacuation of excess water vapour through the under-tile ventilation, helping to improve the thermal properties of the insulating material. The reduced weight of the membrane allows both a pitched roof and wall covering application.
| CHECKED CHARACTERISTICS | NORM | UNIT OF MEASURE | VALUE |
|---|---|---|---|
| Mass per unit area | EN 13859-1 | g/m2 | 130±10% |
| Thickness |
EN 1849-2 |
mm | 0,50±15% |
| Tensile strength |
EN 13859-1 |
N/5cm | MD: 270±15% CD: 150±15% |
| Elongation | EN 13859-1 | % | MD: 100-120% CD: 110-130% |
| Nail tearing |
EN 13859-1 |
N | MD: 90±15% CD: 140±15% |
| Resistance to water penetration | EN 13859-1 | Class W1 | |
| Water impermeability | EN 20811 | m | 3 (average value) Minimum: 2 |
| Artificial ageing Tensile strength after ageing Resistance to water penetration after ageing |
EN 13859-1 | N/5cm | work in progress |
| UV resistance | Internal method | 4 months | |
| Water vapour transmission property | EN 13859-1 | g/m² x 24h m |
WDD: 690±15% Sd= 0,02 23°C 93/50% RH |
| Dimensional stability | EN 13859-1 (80°C) |
% | MD : -2,2<ΔL<0 CD : -0,5<ΔL<0,5 |
| Flexibility at low temperature | EN 13859-1 | °C | -40 |
| Fire reaction | EN 13859-1* *Product supported by wooden board |
E | |
| Air permeability | EN 13859-2 | mᶟ/h m² | <0,3 |
For information regarding use, handling. storage and security see DOP
Product subject to CE mark according to EN 13859-1/EN 13859-2
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