The price for roofing membrane is low and worthwhile

Under-ventilated structures are usually used to cover roofs. The roofing membrane stretched underneath the pans or plates fulfills several tasks. It protects against moisture, acts as a vapor barrier and insulates against heat loss. Despite the low price, it is indispensable.

Purpose of use is decisive

The role of the roofing membrane and its properties depend on the shape of the roof to which it is applied under the covering layer. It is attached to the rafters on sloping roofs such as monopitch, saddle or hip roofs. Roofing foils for this purpose often cost less than one euro per square meter.

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For the tensioning of a roof membrane on flat roofs, high-quality products with special tear resistance and load capacity are usually necessary. In the trade, roofing is often used here, which means that the roofing film must be much stronger than that of sloping roofs.

If more efficient roofing foils are required, which can also hold stagnant water, for example, or are used as a single layer for canopies, the plastics are often reinforced with rubber or synthetic fibers. They are significantly more expensive and prices from ten euros per square meter are not rare.

Important quality criteria

  • Since the roofing foils are permanently exposed to at least partial incidence of sunlight despite their concealed installation under shingles, pans or plates, they must be UV-resistant.
  • The material thickness must be selected depending on the expected exposure to wind and precipitation. The cheapest roofing foils are 1.2 millimeters thick. With the thickness, the price increases by around ten percent per millimeter.
  • Extra thick roofing films over 1.5 millimeters and products with rubber or fiber reinforcement are significantly more expensive and cost from five euros per square meter.

Online sources of supply

  • hanse building materials.de offers standard roofing films in thicknesses of 1.2 and 1.5 millimeters.
  • flat roof shop.de specializes in extra strong and high-performance roofing films.
  • haga world.de carries classic underlay films for pitched roofs.
Tips & Tricks Roof foils with fabric inserts are a little more expensive, but much more tear-resistant. In case of doubt, the small additional expenditure should be made in any case in order to avoid costly repairs of possible damage later.