On 26/02/2013 06:35, usenet2012 wrote:

I'm considering building a wooden frame for a felted apex roof to put
over my leaking concrete flat-roof. What's the best ways of going about
it? Where could I find some plans?

Fix a down a 4x2 or similar "plate" along the two wide edges.

Decide what kind of angles and overhangs etc you want (20 deg looks ok
for a felted roof IMHO), and make a pair of rafters up to check. Cut
birds mouth joints in the eves ends to sit on the wall plate. Allow for
a ridge beam between them at the other end.

If that looks ok, use one as a pattern to make as many as you need.
Nail/screw em all together. Fit a few A frame style restraining joists
across the span (does not need to be every pair). Then board and felt
away... (a couple of layers of torch on modified bitumen felt does a
nice job - 2mm underlay and 4mm mineral finish cap sheet)




--
Cheers,

John.

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