Metra zero
brevetto patent
Breathable and waterproofing underlay
VAPOUR BARRIER
POLYESTER CARRIER
ANTISKID
WATERPROOFING
LIGHT
ROOF
Light monobituminized underlay composed of a polyester reinforcement, with special bituminous compound and with upper external finishing in non-woven polypropylene. It guarantees perfect waterproofing. The membrane is characterized of high mechanical performances, and It is stabilized against UV rays, with anti-skid properties.
Underlay for discontinuous roofing. It can be used under the thermal insulation as a vapour barrier and on the second wooden board, where It is more exposed to the weather agents and where the fixing systems often have larger sections; thus favoring the rapid and safe conveyance of rainwater and its rapid transfer to the eaves line.
| CHECKED CHARACTERISTICS* | NORM | UNIT OF MEASURE | VALUE |
|---|---|---|---|
| Mass per unit area | EN 13859-1 | g/m2 | 500±5% |
| Thickness | EN 1849-1 | mm | 0,75±15% |
| Tensile strength |
EN 13859-1 |
N/5cm | MD: 450±15% CD: 250±15% |
| Elongation | EN 13859-1 | % | MD: 25-45% CD: 30-50% |
| Nail tearing |
EN 13859-1 |
N | MD: 150±15% CD: 170±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: 440±15% CD: 245±15% Class W1 |
| UV resistance | Internal method | 4 months | |
| Water vapour transmission property |
EN 13859-1 |
g/m² x 24h m |
WDD: 1,1±20% Sd= 22±20% 23°C 0/75% RH |
| Dimensional stability | EN 13859-1 (80°C) |
% | -0,5<ΔL<0,5 |
| Flexibility at low termperature | EN 13859-1 | °C | -40 |
For information regarding use, handling, storage and security see DOP
Product subject to CE mark according to EN 13859-1
* Data from one production, they could be updated
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