Cavity Wall Insulation Problem

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My builder has installed a PIR insulation solution for a block/block cavity wall. The PIR solution suggests that it should be tight to the inside cavity providing a void on the back of the outer skin. This is to allow any water ingress to drop to the bottom. However they have filled the cavity with 2x50mm PIR. This will be brilliant thermally, but the manufacturer says that they can guarantee that it will act as a bridge for moisture.

What to do? - its built to second floor.....
 
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They are, but haven't seen this. Do I talk to the builder or building control? Will it cause a problem?
 
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They are, but haven't seen this. Do I talk to the builder or building control? Will it cause a problem?

It will cause a problem if you don't talk to someone.

Why not tell the building inspector of your concern and let him tell the builders to do it properly, thus keeping your head down. It is potentially a major problem and needs resolving before the builder goes on with it.
 

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