A range of metal roofs can be used. They are more commonly used on modern buildings.

Metal tiles

These come in a range of profiles, usually in long strips designed to look like several tiles. The metal is galvanised and then coated with a sand finish. The tiles have the advantage that they are lightweight and can be laid on pitches as low as 10º. They are usually fixed to timber battens. Some makers give a 40 year guarantee on the product (not the installation).

Interlocking metal roofs

Coated metal roofs with preformed interlocking panels. They can be made to look like zinc-standing seam roofs but are cheaper.

Terne-coated stainless steel sheet

A relatively expensive solution used where lead theft is a problem. Stainless steel is long-lasting and if terne-coated, it can look like lead. Zinc may be equally suitable.

Problems with metal roofs

Metal roofs can reverberate in the wind and if the fixings are poor, roof suction can be enough to remove metal roof panels or metal cladding.

Noise may also be an issue as some metal roofs suffer from ‘atmospheric’ or ‘thermal pumping’. This may eventually weaken the roof. If the noise becomes a real nuisance, get a specialist roofing company to examine whether the problems can be resolved by adding additional ventilation.

Professionals will often avoid using this type of roof finish on high buildings or in windy locations.

Professional help recommended?

If the flat roof is covering a large part of your building and needs major repair or replacement, get a professional survey before proceeding.

Who pays?

Roof repairs are normally a common responsibility.

Further information

406 305 Under One Roof

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