Metra zero
brevetto patent
Breathable and waterproofing underlay
SD VARIABLE
COATING
LIGHT
INTERNAL APPLICATION
RECYCLABLE
SEMI-TRANSPARENT
Vapour check underlay with variable permeability, composed of 2 synthetic layers of which a technical membrane react to humidity changes, modifying the density of polymers. With the increase of humidity inside the structure, the membrane becomes more open to the water vapour diffusion, thus favoring the structural longevity.
Placed in direct contact with the thermal insulation on the warm side of the structure, it regulates the passage of water vapour; reduces the creation of dew inside the thermal insulation in cold periods and helps to dry it during warm periods. Thanks to the semi-transparent membrane, the position of the mechanical fixing can be made in a safety.
| CHECKED CHARACTERISTICS | NORM | UNIT OF MEASURE | VALUE |
|---|---|---|---|
| Mass per unit area | ISO 536 | g/m2 | 86±5% |
| Tensile Strength |
EN 12311-1 |
N/50mm | MD: 180 CD: 125 |
| Elongation | EN 12311-1 | % | MD: 68% CD: 79% |
| Nail Tearing | EN 12310-1 | N | MD: 125 CD: 110 |
| Resistance to water penetration | EN 1928 | - | W1 |
| Water impermeability after the artificial ageing | EN 13859-1/2 | - | W1 |
| Vapour transmission property | EN 1931 mod. EN 12572 |
m | 8 0,4-60 |
| Vapour transmission property after the artificial ageing | EN 13984 | m | pass |
| Alkali strength |
EN 13984 |
N/50mm | pass |
| Dimensional stability | EN 13859-1/2 | % | -20/+80 |
| Fire reaction | EN 13501-1 | - | E |
Product subject to CE mark according to EN 13984
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