When it comes to flat roof insulation in South Africa, there are a few challenges that occur. The same methods used for insulating a high-pitched roof don’t necessarily apply. The biggest problem with a flat roof is making sure water doesn’t get in.

This can be a challenge for many roofers. Water can build up on top of the roof and begin to leak. This doesn’t happen as much with a pitched roof as water is designed to run-off into the gutters.

Flat Roof Insulation South Africa


Generally, when installing flat roof insulation like aerolite insulation, the roof tiles or metal sheets will need to be removed to access the cavity space. Taking into account the depth of the cavity space, an appropriate thickness of insulation will need to be chosen. There are many flat roof insulation products and materials that can be used. The chosen product will largely depend on budget and preference.

When insulating a flat roof, adequate ventilation is important. A vapour barrier like sisalation should also be installed to prevent condensation and moisture. Correctly sealing up the roof afterwards is extremely important.

Ventilating a Flat Roof


In a flat roof, moisture can build up quickly. Without ventilation, moisture has no way to escape. This will create a problem at a later stage if not sorted out. Damage to the inside of the roof as well as to the installed insulation may occur in a reasonably short space of time. Creating airflow is crucial to avoid these kinds of problems.

Vapour Barriers


Vapour barriers are important to prevent moisture from entering the cavity space and causing damage to the roofing materials. It’s a barrier that protects the insulation from absorbing moisture. Foil products like sisalation are perfect to be used as a vapour barrier.

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