All of the exterior walls are insulated with 50mm Polystyrene in the cavity.
Trouble is that cavity walls are tied together with brick force which prevent you filling the cavity with large sheets of polystyrene. We resolved the problem by having the polystyrene cut to 340mm sheets which is exactly the distance between the layers of brickforce.
So there are no are gaps and the cavity fits snug as a bug in a rug. At this rate we will be able to get the truss manufacturers to take exact measurements for the roof trusses by Monday morning.
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