Metra zero
brevetto patent
Breathable and waterproofing underlay
BREATHABLE
COATING
ROOF
WIND BARRIER
ANTISKID
WELDABLE
Medium-weight breathable underlay monolithic sheet composed of polyester carrier and TPU finish. The new generation of underlay offers good long-term characteristics with antiskid properties. Thanks to the double coating, the membrane overlay and overlap can be welded with hot air or solvent (THF).
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 TPU layers are resistant to foot traffic and abrasion and the rigid armor allows an easy processing.
| CHECKEED CHARACTERISTICS | NORM | UNIT OF MEASURE | VALUE |
|---|---|---|---|
| Mass per unit area | EN 1849-2 | g/m2 | 340 |
| Tensile Strength |
EN 12311-1 |
N/50mm | MD:430 CD: 500 |
| Elongation | EN 12311-1 | % | MD: 55% CD: 65% |
| Nail tearing |
EN 12310-1 |
N | MD: 325 CD: 270 |
| Resistance to water penetration | EN 1928 | Class W1 | |
| Resistance to heavy rain according to ZVDH | - | - | NPD |
| Artificial ageing | EN 13859-1 | - | passed |
| Resistance to water penetration after ageing | EN 1928 | Class w1 | |
| High requirements for artificial ageing according to ZVDH (80°C) | - | - | OK |
| Vapour transmission properties Sd | EN 12572 Clima C | m | 0,1 |
| Temperature tensile | - | °C | -40/+120 |
| Flexibility at low temperature | EN 1109 | °C | -40 |
| Fire reaction | EN 13501-1 | - | E |
| Air permeability | EN 12114 | WGL | 0,000 |
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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