A flat roof should preferably be insulated from above. A layer of rigid insulation board can be added either on top of the roof’s weatherproof layer or directly on top of the timber roof surface with a new weatherproof layer on top of the insulation. This is best done when the roof covering needs replacing anyway. If your flat roof needs to be replaced anyway, you must now insulate it to comply with building regulations.
It is possible to insulate a flat roof from underneath, but this can lead to condensation problems if not completed correctly. Installing flat roof insulation could save you similar amounts on your heating bills to loft insulation. The savings will vary depending on how much of the property has a flat roof.
A flat roof has a slight pitch or no slope, designed to allow water to drain gradually. It usually appears flat from a distance. If you’re unsure, a professional roofing contractor can inspect your roof to confirm.
Most homes or buildings with flat roofs can benefit from insulation. However, the suitability depends on the roof’s condition and structure. A qualified installer can assess whether your roof is suitable for insulation or if any repairs are needed first.
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