We’ve just had our new UPVC windows fitted in our new SIP timber frame build and the NHBC inspector is saying that they have been fitted incorrectly as a DPC has not been installed. We are now facing the prospect of having to have them taken out and re-fitted. Has anybody come across this and/or know where we stand? Something else to mention is the fact that they are already sealed in with expandable foam, there is already a moisture membrane between them and the timber frame panel, and there will also be a mastic seal in place when the render is applied. Many thanks

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