Thanks, Andy. Since I'll almost certainly be going to glass fibre, does the same apply?
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2 years ago
Flat roof - again.
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2 years ago
I suppose I should have said bitumen rather than asphalt, but I dunno whether resin would stick to it any better, if the chaps says new decking is required, I'd tend to accept that.
When I EDPM'ed my roof the deck was soggy weetabix anyway, so got replaced.
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2 years ago
As I said the spec on mine was decent marine ply, and I'd guess that was what used. There's no signs of sagging. But of course fixing fresh ply to that ain't going to cost a fortune.
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2 years ago
With fibreglass it is even more important for all ply/OSB edges to be supported. This means either using 18mm T&G OSB 8x2 decking or supporting *all* butt joints with noggins.
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2 years ago
The architect who designed this roof came round yesterday. Purely on his own initiative - I only asked him for a roofer recommendation. Brought all the original plans with him too. And at the age of 80, went up a ladder onto the roof for a good look.
The way the roof works is rain water is routed across to one side and to the front. Then onto a conventional pitch slate roof and down to the guttering. That pitched roof is about 2 metres wide, over the doorway to the roof terrace. Beneath that roof is the cold water storage tank, which is accessible from the room, so you can see the roof joists etc of the sloping part. With difficulty. ;-)
His spec says a lead 'soaker' should be between the ply of the flat roof where it meets the sloping one. The felt and tiles over that. With more lead on top at the join. And he is pretty certain that 'soaker' was never fitted. Which would account for the occasional leak when the wind drives the rain in a particular direction. Which has happened from when it was built - although that combination of rain and wind direction rare here.
I've not yet got a price etc from the roofer he uses. But he wants to be there when the roof it stripped to see just how that transition was made.
Quite restored my faith in human nature - someone still caring about a job done some 30 years ago.