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An additional piece of information for the original poster: Yesterday I got hold of an installation guide for my frames, which are Duraflex. It has a series of diagrams showing example installations and these clearly show that when necessary insulation in the the form of foam filler should be...

Cheers, John - I had been formulating a similar plan! In fact I had a go with some pilot holes just yesterday to test the theory, but it's hard to tell how successful or otherwise it was. My concerns are that any foam falling to the bottom of the cavity could bridge the DPC, not to mention...

I have a very similar ongoing problem with replacement PVCu windows and a patio door. I took the PVCu flashing strip away from the edge of one offending window and found that the fitter hadn't closed the cavities or used any kind of filler/insulation, so my nice new A rated windows are just...

Thanks for the replies, guys. I was thinking of sorting it out myself using foam filler, but reason that the insulation would be far better and more effective with insulated closures? I'm also wary of using foam filler; the external brick work is old lime mortar and I have read horror...

Hi! I've been a "guest" user of this superb site for many years and have benefited from loads of advice just by reading posts and replies, so thanks to all the contributors! But the time has come for my first "proper" forum question, so here goes: The question, put simply, is "what would...