Metra zero
brevetto patent
Breathable and waterproofing underlay
VAPOUR BARRIER
ANTISKID
WATER - PROOFING
MECHANICAL RESISTANCE
ROOF
WELDABLE
Bituminous roofing underlay, flexible with bituminous edges for prevention and increased protection against the risk of infiltration along the area of mechanical fixture, also on slight gradients (up to 6°C). The plastic three-dimensional structure is particularly suitable for roofs with folded sheet steel: creates a series of pipelines that ensure outflow of the condensate that has formed below, thus avoiding constant contact between the sheet and the humidity.
In pitched roofs, mainly made out of wood and with primary mantle in folded sheet steel. Highly accessible, it provides an excellent support to the sheet steel, especially during assembly, preventing the formation of dents. Its regular channels offer better microventilation, staying clean more easily. Sturdiness and flexibility enhance the product’s adaptability to the various forms of this specific type of roof. BB technology ensures the prevention of infiltration.
| CHECKED CHARACTERISTICS | NORM | UNIT OF MEASURE | VALUE |
|---|---|---|---|
| Mass per unit area | EN 13859-1 | g/m2 | 1500±5% |
| Mass per unit area of the foil | EN 13859-1 | g/m² | 400±5% |
| Thickness | EN 1849-1 | mm | 4,2±15% |
| Tensile Strength |
EN 13859-1 |
N/5cm | MD: 700±15% CD: 450±15% |
| Elongation | EN 13859-1 | % | MD: 25-45% CD: 35-55% |
| Nail tearing |
EN 13859-1 |
N | MD: 420±15% CD: 410±15% |
| Resistance to water penetration | EN 13859-1 | Class W1 | |
| Artificial ageing Tensile strength after ageing Resistance to water penetration after ageing |
EN 13859-1 | N/5cm | MD: 462±15% CD: 297±15% Classe W1 |
| UV resistance | Test in progress | ||
| Water vapour transmission property of the bituminous felt |
EN 13859-1 |
g/m² x 24h m |
WDD: 0,28±15% Sd=152 23°C 0/75% RH |
| Dimensional stability | EN 13859-1 (80°C) |
% | -0,5<ΔL<0,5 |
| Flexibility at low temperature | EN 13859-1 | °C | -20 |
For information regarding use, handling. storage and security see DOP
Product subject to CE mark according to EN 13859-1
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