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Integrity of concrete roof to outbuilding

Posted: Thu Jun 03, 2021 11:44 am
by RedFred85
Hi, I have a brick outbuilding with a concrete roof. Circa. 5x3 meters.

The external surface is coarse and weathered and water has gradually been making its way inside.

I am concerned about its integrity, although it does seem solid at the same time.

I have no experience with these roof types so don't know of this is typical of their condition.

I have had a roofer take a look and he advised to batten with sloping firrings, board with OSB and apply a GRP finish.

Two questions:
1. Does a GRP roof seem a good way forward?

2. Is the condition typical and likely to be sound?

Many thanks.
RED