Flat roof on garage

Postby greengrass » Thu Sep 24, 2009 7:53 pm

32ftt x 10 ft garage : rafters 4 x 2 x 12ft lengths supported by 3 x 6 x 2
beams first two set in side walls one over front entrance door strapped to wall.
Approximate run between beams is 11 feet except of course the one over the door set about 10ft

I want to overlay existing roof with OSB on cross battens of 2 x 1 so will I need to add more 6 x 2 inch cross supports to take the extra weight?
Many thanks in anticipation of reply/ies.
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