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HI all, I have used this forum for years but finally have to pose my own question rather than simply leech off others… I am replacing the existing felt flat roof on my 1970s kitchen extension with a warm roof build up of (existing) 18mm ply deck / Alutrix vapour barrier / 150mm PIR / 18mm ply / EPDM. I would like to add a flat roof light while I am at it which brings me to my question(s)… The roof dimensions (exterior) are 3.8m x 4.2m and the joists are 150 x 50mm at 40cm centres spanning 3m. I have currently narrowed down to two options which are as follows: 1. Install a 1m x 2m rooflight which would mean cutting 4 joists - I was planning to treble the joists at both ends and double the headers on the long sides (sistering joists and using hangers/fixings etc as outlined in building regs). 2. Install 2 x 1m x 1m roof lights which would mean cutting two joists for each - in this case I would only double the joists at either end but still double the headers. This design would leave two whole joists between the two roof lights. Option 1 is both cheaper and easier in that the EPDM could be a challenge with two roof lights to work around and clearly one window is cheaper than two! However, i feel that option 2 is better structurally but I would really appreciate some input as to the proposed design for option 1. One corner will also sit above a window lintel which is unavoidable in either lay out! Any advice would be greatly appreciated! Many thanks in advance, Will

Looking to replace and refurbish an old flat roof. I have considered EPDM rubber rolls (Classicbond), however a roofer suggested for climates with unpredictable weather that I should consider Liquid PU or EPDM. Has anyone used this system for replacing a felt roof? I've had a look at a few vids by Steve Roofer The system looks promising, or is it too good to believe? I have come across the following products - Kemper Liquid Waterproofing - Hydrostop EU AH25 - Ecothane Liquid Rubber

Hi all, I'm designing an extension to the rear of my house and was planning a very shallow pitched roof with a couple of roof lights. Having struggled to find the exact detail online I've drawn up the detail below indicating the roof junction, skylight & hidden gutter. I have little experience in construction and would appreciate any comments/potential problem areas. Many thanks, JM