flat roof - slope for run off

just wondered what sort of slope to put on a flat roof over new kitchen/living room and how to achieve this (assuming here that you cut say 3x2 down so that one end is higher than the other, then fix this to the roofing joists).
Whats the correct way of doing this please.
Also need some info on the type of insulation to use (is it best to use the ply sheets that have insulation attached to them)?
i know there are bound to be a few threads that ask why not make it a pitched roof - thing is it fits in with the design we want to achieve plus at 4m wide, a pitched roof would be far too high to get above a 14 degree slope.
suggestions please
dunc
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Our extension was done like that - looked like bits of 6x4 or similar, nailed to top of joists to give a slight slope for the roof-boards. Something like about 6 inches in 12 feet was the slope. The wood was delivered ready cut, so if you ask at the wood yard, they might provide a cutting service ... hth Neil

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I'm just trying to remember if it is a slope of 1 in 400 or what. It's 4 mil in a meter level out of level so what is that?
I think it is the same as the bubble touching one of the lines. The strips are called firring pieces. I never did hear why. It beats me why we can't just angle the joists.
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You buy tilting fillets from your timber merchant give them the width and they will cut them for you simply nail on top of joists to provide fall

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