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 mechanical strength
- very high resistance to UV radiation
- highly beneficial combination of high durability and high vapour permeability
- waterproof, seals the roof
- high surface weight and thickness guaranteeing durability
- suitable for use on decking and directly on rafters (without decking)
- comprehensive information enabling correct application
| PARAMETER | VALUE |
| Material | polypropylene - 3 layers |
| Mass [g/m²] | 215 ±20 |
| Sd – equivalent air layer thickness [m] | 0.015 (+0.06/-0.01) |
| Tensile strength [N/5cm] | lengthwise: 400 (±100) crosswise: 280 (±100) |
| Elongation at break [%] | lengthwise: 90 (±50) crosswise: 110 (±50) |
| Nail tear resistance [N] | lengthwise: 260 (±90) crosswise: 340 (±100) |
| Water tightness class | W1 |
| Fire resistance class | F |
| 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 was determined in relation to the average annual solar UV exposure in Central Europe.
** The recommended period for the membrane to remain on the roof without the primary covering should be as short as possible and depends, among other things, on the membrane's construction.
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