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Phil L[_3_] Phil L[_3_] is offline
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Default How much harder is it to make a flat roof with a small slope?

GB wrote:
I see them all the time - flat roofs that are completely level, and
water pools on the roof just waiting to get into the building. Why
don't they get built with a slight slope, maybe 1-2cms per metre? If
that were done, the worst of the water would run off rather than
pooling and the roof would dry out quickly once the rain stops.

Of course, that's harder to build, but how much harder? Is the main
issue packing out the joists so the roof slopes, or is there more to
it than that?


Hmmm.

Is this a wind up?

'flat' rooves are not flat, they already have this slope built into them,
and no, it's not hard to do, it's a taper - timber merchants will cut any
sized taper you want, up to 6m in length - these are placed one upon each
joist to achieve the fall.