Converting outbuilding - replacement for corrugated roofing

7 Oct 2013
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United Kingdom
I'm planning the conversion of a single skinned brick outbuilding. I'm going to insulate it inside and may have some questions about that later but first things first - the roof.

The roof is currently corrugated asbestos sheets with no ceiling inside. I'm planning on putting up a standard plasterboard ceiling inside but need to know what the best material to replace the asbestos roofing is. I was looking at the modern equivalents - corrugated bitumen and corrugated metal. Are these materials suitable for roofing an insulated habitable space? I'm building an office so it needs to be warm and damp-free.
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Kingspan insulated panels or equivalent.
The products you have described are low end 'shed' coverings.

To satisfy building control you will need to design a roof that satisfies their structural, thermal and venting criteria.

You may be able to use those sheets but it would be foolish to build a grand structure beneath only to cover it with tat.
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It certainly isn't going to be a grand structure, it's basically a brick small (4sqm floorspace) shed attached to the house that I want to use as a room. Obviously I'll insulate between the ceiling and the roof covering. I've been looking at plastic coated steel which seems like a good option.

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