I have just built a 2 storey extension and am putting a flat roof on it, can anyone tell me if its possible to do a warm roof construction without having an upstand ?
and also if I go with the cold roof system do I need to have a wall plate or can I sit the joists on top of the block work ?
donnyt,
Because of the depth of the insulation for a warm roof you will probably have to have an upstand.
It is better to have a timber wall plate so you can fix the rafters in position.
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