Products for building
Roofing screens are an improved version of underlayment membranes. They serve the same function but are more resistant and durable. They can be used in the most demanding conditions and locations on a roof.
The roofing screens produced by Marma Polskie Folie combine high durability with very high vapour permeability, which is only possible thanks to state-of-the-art technologies.
Advantages:
- high and uniform vapour permeability
- high elasticity and lightweight to facilitate installation
- waterproof, seals the roof
- very high mechanical durability
- very high resistance to UV radiation
- wide product range to facilitate the choice of a proper membrane
- complete information available for proper installation
| PARAMETER | VALUE |
| Material | polypropylene - 3 layers |
| Mass [g/m²] | 165 ±20 |
| Sd – equivalent air layer thickness [m] | 0.015 (+0.03/-0.01) |
| Tensile strength [N/5cm] | lengthwise: 350 (+60/-80) crosswise: 240 (+60/-80) |
| Elongation at break [%] | lengthwise: 90 (±50) crosswise: 110 (±50) |
| Nail tear resistance [N] | lengthwise: 230 (±80) crosswise: 300 (±90) |
| Water tightness class | W1 |
| Fire resistance class | E |
| Roll dimensions [m] | width 1.6 m × length 50 m |
| UV resistance* | 26 weeks |
| Period without main covering** | 4 weeks |
* According to laboratory studies conducted under artificial aging, this period is based on average annual UV exposure from sunlight in Central Europe.
** The period for which the membrane remains on the roof without the primary covering should be as short as possible; the more sunny days there are, the shorter this period should be.
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