I need advice on flat roof replacement. A cowboy builder built a fibre glass flat roof with Velux window and incorrect slope about 6 months ago. The problem I am having with the roof is minor leaking especially around eaves and Velux due to incorrect slope and job was done poorly.
Recently a roofer suggest following:
Option 1: Rip off existing roof, correct slope and change Velux window to roof dome and redo fibre glass.
Option 2: . Re do a new structure timber deck roof to 15 degrees pitch roof. Apply 18mm osb board and GRP fibreglass system with a top coat in grey. Sides of the extension timber deck it and supply a plastic fascia board
Which option would be better? Can someone please advise me?
On looking, both options are pretty much the same. I would rip it all off and start again with a minimum fall of ½ an inch per 12 inches of run. IE 1 in 24. The minimum recommended by Building Regulations is 1 in 40.
I would use 3mm rubber rather than GRP as it’s guaranteed for 40 years and will move if the roof moves, which they always do.
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