On Sun, 07 Jun 2009 20:44:48 +0100, Stephen wrote:

Hello,

I am thinking or replacing my (leaking) flat carport roof with something
like Onduline corrugated sheets. I read the onduline fixing guide,
available on their web site, and it requires joists and noggins 2X2 IIRC.
This seemed a bit big to me, but I guess it allows for snow on the roof
and it is a common size of timber.

Is it best to buy treated timber or since it will be under the roof and
dry, doesn't it matter?

I wasn't expecting it to need noggins. What is the best way to fit them? I
wondered whether I could mortice the joists, but I now think I may be
making extra work for myself! Would it be quicker and easier to just
screw/nail them?

I will attach a length of wood to the wall of the to run the joists from.
Would a hammer fixing be strong enough or would it be best to use a sleeve
anchor? I'm thinking the latter just to be sure.

Any tips on how to attach the joists to this rafter, making sure they are
all at the same angle?

Thanks.

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You don't actually need the length of wood (wall plate) attached to the
wall as you can use individual joist hangers. You'll need to notch each
joist to achieve a fall and then put the top row of noggins as close to
the wall as the hangers will allow. Flashing will cover any gaps.

I think you definitely need bigger than 2" x 2" timber - 3" x 2" min but
4" x 2" if very long or exposed to high winds.

See: www.screwfix.co.uk for joist hangers.

Cic.

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