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Dear all, A small number of challenges for a Tuesday evening...... Challenge No 1 Picture 1 The picture below is our fire place The gap between the timber frame and the brick wall is the cavity, so any suggestions how I seal this up so that its (permanently) airtight. Would like to achieve below 2 on the airtight test. I assume some sort of timber bonded in place but I am open to any advice. Challenge number 2 Picture 2 how do I make the chimney 'ceiling' airtight (obviously not the flue) - I know now that I should have poured a slab with the flue set into it rather than use the lintels - hindsight is a great thing, shame you only acquire it after the event :-( Maybe 'plaster' it? Maybe a neat job would be to somehow fill it all in, board & then skim it all? - would look neater. Challenge No 3 Picture 3 On a similar line, the picture below shows a gap that I need to close up. The house has overhangs on both sides - looks nice on plans but they need sealing from the rest of the house since in effect they are external space. I was going to screw some supports either side and then some 1/2" ply to close the gap - would some sealing tape then do the trick with regards to airtightness? Tempted to use some silicone in there as well just for a backup. Challenge No 4 Picture 4 This is the void below our first floor - it needs insulating (otherwise it will be a condensation trap) - but how much? I've got some 140 / 150mm celotex about but its a pain to cut and install & I'd rather send it back for a refund. The other option is to use some 3" celotex (a few sheets kicking about) or since I've got to sound proof it all do I just continue the soundproofing down over the wood? This would be the easiest but I'd rather do the correct thing than something easy! Final challenge! Picture 5 Laid the UFH a week ago - the design required some cutting out - I was going to foam these when I suddenly wondered if it would react with the pipe work (Wunda pipe) - am I being OTT or should I play it safe & put something around them first. I'd prefer that each room screed is separate - hence why I want to fill the cuts up. Cheers for any help / guidance. CC