Warm Flat Roof Condensation

Condensation within a flat roof mainly occurs during cold weather when moisture vapour in the air which has been generated within the heated building rises from the room below into the cold roof void above the ceiling.

Warm flat roof condensation.

Condensation is never good news for a flat roof. Single ply membranes like tpo pvc and epdm. And even shingles explains. Flat roof construction thermal design and condensation.

Flat and low slope roof designs to avoid moisture condensation problems flat roofs call up a whole new breed of building moisture problems how to avoid moisture traps under flat roofs avoid mold rot caused by moisture trapped under un vented flat roofs questions answers about the cause cure prevention of moisture problems in flat roofs and similarly hard to ventilate structures. For guidance on roof insulation please contact us on 44 01257 488 000. Condensation is a problem that should be taken seriously. Cool roof temperatures may increase the possibility of condensation if warm moist air from the interior comes into contact with the assembly.

Thermal design is concerned with the flow of both heat and water vapour through the roof construction and their subsequent effect on the performance of the roof and the various components in the system. A warm roof features a structural deck vapour control layer insulation and waterproofing a tried and tested solution that the industry knows works. In this type of roof you remove both of these levels of. The designer therefore needs to consider the amount of insulation required to control.

Designed specified and constructed correctly a warm roof will keep the roof structure at the same temperature as the building s interior eliminating the possibility of condensation. In a cold roof condensation is prevented as the ventilation taking away the moisture vapour before it can form as condensation. This is especially so if it occurs within the roof s structure itself as this can lead to decay in the roof timbers which is very difficult to spot. It can also reduce thermal insulation performance which can be a particular problem during winter.

On a warm flat roof the layer is installed underneath the insulation to stop moisture interacting with it through rising thermal pressure lower down in the building. Of course warm deck construction is always best but remember this might not be possible on certain buildings. There is a likelihood that this practice could contribute to a condensation risk and therefore it would be strongly recommended to have a condensation risk analysis carried out to highlight. Keeping your flat roof condensation free is vital for longevity.

As long as your flat roof has been properly installed and you choose the right deck construction for the building you shouldn t have any more problems caused by condensation. For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below to create an effective barrier. Find warm flat roof cold flat roof insulation solutions at iko polymeric.