In message , Chris Bacon
writes
This flaming garage pent roof is giving me a headache. It's a 6m deep,
5m wide building.

I have found that I can't use 3" (sinusoidal) corrugated iron, 'cos the
height peak to peak of the stuff is only 19mm, and I've a 6m run, and
it is likely (!) to leak, 'cos it needs a minimum 10° slope, and I've
only got ~4.4. So it's got to be 34/1000 box profile, which is said to
be OK down to 4°.

There are still disadvantages from my perspective, but I think I can
live with them.

One thing I can't have, though, is the 5m wide front of the thing
looking like castle rampartd in miniature, so it needs some sort of
flashing to get over that.

What's used for this? Barge boards, yes, for the sides, which are like
sheet metal equal angle, but what about the ends? Surely if I just use
barge board, the 90° angle will be wrong, and it will allow water to
blow up the tiny slope, and run back under the roof sheets, which is
not what is wanted!

So what's the done thig with this stuff? I'm getting pretty thirsty I
can tell you.

The suppliers of box section roofing (AS35?) will supply 1m wide
expanded foam strips (ridge fillers) to go under your 90 deg. flashing
strips.

Steadmans, Carlisle manufacture the stuff and their website is good for
advice. Fixings can be got locally nowadays and a nearby source likely
cheaper.

--
Tim Lamb