Metra zero
brevetto patent
Breathable and waterproofing underlay
BREATHABLE
COATING
WATER - PROOFING
UV RESISTANCE
FIRE PROTECTION
ROOF + WALL
Highly breathable underlay that combines waterproofing properties, vapour permeability, mechanical resistance with extraordinary properties of fire reaction.
Placed in direct contact with the thermal insulation on the cold side of the structure, it allows a rapid evacuation of excess water vapor through the under-tile ventilation, helping to improve the thermal properties of the insulating material.
The particular fireproof surface finish allows the product to be laid in coverage directly under the photovoltaic panels or in ventilated façades with open joints.
| CHECKED CHARACTERISTICS | NORM | UNIT OF MEASURE | VALUE |
|---|---|---|---|
| Massa per unit area | EN 13859-1 | g/m2 | 720±5% |
| Thickness | EN 1849-2 | mm | 1,2±15% |
| Tensile Strength | EN 13859-1 | N/5cm | MD: 300±15% CD: 275±15% |
| Elongation | EN 13859-1 | % | MD: 2-3% CD: 2-3% |
| Nail tearing | EN 13859-1 | N | MD: 180±15% CD: 220±15% |
| Resistance to water penetration | EN 13859-1 | Class W1 | |
| Water impermeability | EN 20811 | m | Minimum value: 2 |
| Artificial ageing Tensile strenght after ageing Resistance to water penetration after ageing |
EN 13859-1 | N/5cm | MD: 285±15% CD: 234±15% Class W1 |
| Artificial ageing (5000h uv + 90 days 70°C) Tensile strength after ageing Resistance to water penetration after ageing |
EN 13859-2 | N/5cm | MD: 290±15% CD: 240±15% Classe W1 |
| UV resistance | Internal method | 12 months | |
| Water vapour transmission properties | EN 13859-1 | g/m² x 24h m m2sPa/Kg |
WDD: 250±20% Sd=0,08±0,2 4,3 x 108 23°C 93/50% UR |
| UNI 11470 | Membrana altamente traspirante | ||
| Dimensional stability | EN 13859-1 (80°C) |
% | MD: -1<ΔL<0 MD: -1<ΔL<0 |
| Flexibility at low temperature | EN 13859-1 | °C | -20 |
| Fire reaction | EN 13501-1 Test method: EN 11925-2 and EN 13823 (SBI) EN 13501-5 UNI CEN/TS 1187 |
B s1 d0
|
|
| Resistance to air penetration | EN 12114 Δp max 100Pa 0,5m2<A<1m2 |
m3/(m2xhx50Pa) | <1,3 |
Product subject to CE mark according to EN 13859-1/EN 13859-2
Certificates of costancy of performance No. N°0402_CPR-SC1032-17, N°0402_CPR-SC1033-17 issued by the notified certification
body N°0402 (RI.SE)
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Consulting, dialogue, creating tailor-made solutions is what we do best. We love coming to grips with new ideas and finding effective answers. Please feel free to contact us via mail or telephone for advice, for a project, or to find out more technical information.
Via Postumia Ovest 226 - Olmi - 31048 San Biagio di Callalta TV
