Metra zero
brevetto patent
Breathable and waterproofing underlay
BREATHABLE
ULTRASONIC WELDING
RECYCLABLE
WATERPROOFING
WIND BARRIER
ROOF
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 anti-skid 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 | 150±5% |
| Thickness | EN 1849-2 | mm | 0,7±15% |
| Tensile Strength |
EN 13859-1 |
N/5cm | MD: 300±15% CD: 215±15% |
| Elongation | EN 13859-1 | % | MD: 65-85% CD: 80-100% |
| Nail Tearing |
EN 13859-1 |
N | MD: 160±15% CD: 180±15% |
| Resistance to water penetration | EN 13859-1 | Class W1 | |
| Water impermeability | EN 20811 | m | 4 (average value) Minimum: 2 |
| Artificial ageing Tensile strength after ageing Resistance to water penetration after ageing |
EN 13859-1 | N/5cm | MD: 270±15% CD: 204±15% Class W1 |
| UV Resistance | Internal method | 4 months | |
| Water vapour transmission property |
EN 13859-1 |
g/m² x 24h m |
WDD: 815±15% Sd= 0,02 23°C 93/50% RH |
| g/m² x 24h m |
WDD: 2000±15% 38°C 93/50% RH |
||
| Dimensional stability | EN 13859-1 (80°C) |
% | MD : -3,4<ΔL<0 CD : -1<ΔL<0 |
| 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
The product complies with the requirements of ZVDH (German roofers association) Class UDB-A
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