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Now that I come to look in detail at our rafter tails, I am beginning to realise that they were designed by someone who has never fitted the specified PIR in between any rafters, let alone ours....... First an empty rafter tail: the end in mind is fill it with insulation Yes, you are right: each rafter has a double bird's mouth. The gap between the rafters in this case is 318mm wide. The gap that needs filling starts at the wall (bottom of the image) and runs up to the noggin between the rafters. The wall plate (sitting in its green polythene jacket) sits about 25 mm in from the inside edge of the wall. So, I had a go: this is what I did; Before you start applauding my master-craftspersonship, there's still gap at the back of the wallplate to fill. Grrrr. This is the architect's illustration of the way the gap will be filled..... I love the elegant way the PIR fits seamlessly over the wallplate. The reason I am growling is that the gap between each rafter is a few mm different to the others. So, 6 years from now, I will still be stuck on a scaffold shaving off a few mm here and there to fit the sodding PIR. Please tell me there is a better way. By better I mean quicker. No is not acceptable The best idea so far I have had is to give Debbie some glue, a saw, some off cuts of PIR , a safety harness and go for a walk......
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