Hi All, I have a conservatory which has two sides of UPVC (Double Glazing) in the frames and the other two walls are breeze blocks (One is a boundary wall). We have a bad case of water ingress coming in from the top of the roof, on the wall which is the boundary wall between the houses. I have had a quote by a professional company, but having just purchased the place our budget is a bit tight to afford the works carried out. Thankfully, on the quote the consultant listed works in simple talk: - Recut chase in masonry and fit new flashings. Would it be best to use flashband or code 3 or 4 lead flashing? Do I need to finish it off with felt etc? I would have to re cut the chase in the masonry, but as the coping stone is loose on the boundary wall, I could flash up the wall and over the block. Then cement the stone back down. Is this the better option for all round waterproof sealing? - Rake out mastic beads and reform. Please see the photos, which product would you suggest for ultimate waterproofing? Silicone based or cement? As you may note the mastic is pretty messy, when I push my finger against it at the top especially it's like a mini sponge. The top seems to be filled in with a filler, which when touched is also like a mini sponge - very flaky. The UPVC panel to the left can come off, which I suspect may have some gaps in it. I also suspect that the flashing isn't covering the area well. The breeze blocks are cold to the touch in this weather from the inside, and are externally rendered by a pro who lives next door. After getting it waterproofed so we have no more water ingress from the top, is there a durable plaster that can withstand these cold and hopefully hot temperatures without cracking or flaking? If so, what would you recommend? Thanks in advance.