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Posted to uk.d-i-y
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Flat roof question.
On 29/07/2020 02:55, wrote:
On Tuesday, 28 July 2020 15:02:47 UTC+1, Theo wrote:
Andrew wrote:
Sounds like it has already leaked allowing the decking to weaken and
sag, hence the ponding. Complete re-decking it the solution.
That's what I suspected. Although I wondered if there was a say 5 year
shorter term fix?
Back in '13 or 14 we had a very bad felted roof & looked primarily at EPDM & steel. In the end a temporary job was done using bedsheets, bitumen & sand without stripping any of the damaged felt. Last time I checked it was still fine. Given that I'd take that approach again in future. Total cost was under £25 & it was quick compared to a new roof. Just wear junk clothes, they will get ruined.
Early flat roofs were deliberately ponded to increase felt life expectancy. It was soon learnt it wasn't the best idea, but it's not a game ender either. If you cover a sagging roof you take a gamble on its life expectancy, but it's £25 versus far more.
NT
Flat roofs in Germany are ?always made to force ponding for some reason.
On a Grand Designs program, from many years ago, a house in East London
was given an expensive makeover with a big extension that specified a
German flat roofing system, and people came over from Germany to
do the roof. It leaked !
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