Yes my neighbour many years ago did their build using family members and of
course now the new owners have always had puddling and leaks despite several
re applications of the outer surface etc.
Obviously it took many years and you cannot prove a negative in that had it
had a greater slope, would it have fared better in the same time scale, but
it is a little worrying, and I do wonder if anyone actually checks this sort
of thing properly.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Mathew Newton" wrote in message
...
We have just had the shell of an extension built which includes a flat roof.
Firring strips have been used to produce a fall to one side however this
fall is around 20mm over the 3000mm span i.e. 1:150.

Everything I am reading states that, as per BS6229, flat roofs should have a
minimum fall of 1:80 (i.e. 37.5mm in my case) and really ought to be
designed for 1:40 (75mm) to allow for inaccuracies in construction,
settlement of materials etc.

Unfortunately I have only just spotted this and the roof covering
(consisting of OSB sheets, vapour barrier, 125mm solid board insulation, ply
and a polyurethane liquid membrane) along with cavity trays and flashing all
now in place.

Now I'm fretting about possible issues in the future. Am I right to be
worried? Should I be seeking this being altered? I was going to speak to
Building Control tomorrow to say what they say but whilst they might confirm
the fall is low I can't see anything in the regs that mandates a fall and I
don't know whether BS6229 is mandatory either (it seems more of a code of
practice).

Grateful for your thoughts.

P.S. For what it's worth I must admit to having a tendency to worry - to the
point of anxiety - about detail like this.