London Flat Roofing. 154c Fleet Road, Hampstead, London NW3 2QX
I have converted the garage into a games room and the ceiling has damp patches and the fuse has blown for the lighting. The roof has a drainage hole in one corner which is not very effective , as I have previously seen water pooling on top of the roof. I would also like better insulation in the roof as there is a lot of heat loss and wind that comes through the ceiling light fittings.
I want to put a second layer of ply sheet on top of the insulation board, I can screw that down around the edges, but want to put a line of fixings down the middle, but this would mean going through the board until I get to the ply underneath.
Please can you give me a cost to replace the flat roofs in the photos I’ve sent, one is my roof and one is my neighbours.
I was doing a thermal imaging survey of a flat roof in London and look what I found on the pall of another property. You can see the chimney flues removing the hot air from inside the building. But what a great photo.
I’ve been studying the YouTube videos by Steve. I’m a pro now after doing my balcony with internal gutter. I have built a roof with 1 in 60 fall leading to an internal gutter. 18mm osb3 deck vapour barrier 100mm of Celotex with a 6mm ply under the rubber.
Over the years, an old flat roof can be upgraded. The ceilings below are taken down and insulation is added between the joists, which isn’t necessarily a problem. However, as changes are made in the property below, problems may start to happen.
Note the little dots on the decking, indicating they opted to use a perforated 1st coat of felt. The idea behind this is that the 2nd coat of felt will only partially bond to the decking. This ensures that when it fails, the next roofer can remove the old felt without having to hack away at the decking. This can be a common problem, because when roofers don’t follow manufacturers’ instructions, and fully bond the roof, the cost of removing the old roof covering could be considerably more expensive.
The roof has been stripped and the insulation has already been taken up the scaffolding, ready to go down. You can see that the insulation has been laid out over the old decking and is being screwed down, ready for the finishing layer of EPDM single ply rubber to be laid.
This gives an idea as to what we were up against. Our specification for this new flat roof was to strip the old roof, apply insulation and re-roof using EPDM rubber. Just what we were going to do with the parapet walls and chimneys was always going to be up for debate and, as part of the pricing, we had discussed that a Provisional Costs (PC) sum should be put to one side to deal with the renovation of this area.
In this video I explain problems with insulating a roof using the warm and cold roof construction methods. Whatever new flat roof covering you choose, e.g. EPDM rubber, Kemper, Liquid Rubber Triflex, if the specification of the insulation is not correct you could have problems which could include rotting joists.
