Friday 15 November 2019  
   

Non-protected membrane of flat roofs
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nezaščitena, izpostavljena hidroizolacija ravne streheRoofs with non-protected waterproofing layer are considered as non-protected roofs.

Durability of a non-protected roof depends mostly on the quality of the final waterproofing layer, but also on later operations on the roof and the frequency of its use. The exposed waterproofing membranes are aging faster under the influence of temperature fluctuations and UV light, which reduces their flexibility, what makes them more sensitive and non-resistant to temperature expansion and contraction, as well as under mechanical loading. Mechanical and UV resistant membrane needs to be chosen.
It is possible to use wool thermal insulation on non-trafficked roofs, but the roofs with occasional or long-term foot traffic should be thermally insulated with higher load-bearing thermal insulation, such as e.g. FIBRANxps 300-L. As these boards do not yield under load,  additional damaging of non-protected or protected waterproofing membrane is prevented.

If a long-term use of the building is assumed, the investor prefers to select the INVERTED roof, with a much longer durability.

Note:

Bituminous waterproofing layers:

Working with naked flame on polystyrene insulation is not permitted, therefore when using bituminous insulation, self-adhesive waterproofing bands should be used.

PVC waterproofing layers:

The chlorides in PVC membranes have a negative effect on polystyrene boards when in direct contact, therefore an adequate separating layer should be applied between the two.



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