I will be putting a FLAT roof on a garage and am wondering what size joists to use. They will be spanning 2 lots of 3.5meters between the outer wall and the central beam (the total length will be around 7m). I am thinking of using 6" x 2" but just want to ensure that they do not sag after a few years. Any ideas?
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Joist Sizes
- Thread starter bhavDIY
- Start date
You need to go to at least 50x175 @400 centres or 50x200 @ 600 centres.
or 150x50 if you use c24 timber 
at 400c of course
at 400c of course
The Trada tables don't support your sizing even @ 400 centres with C24. The roof won't collapse of course but may sag over time.or 150x50 if you use c24 timber
at 400c of course
The Trada tables don't support your sizing even @ 400 centres with C24. The roof won't collapse of course but may sag over time.or 150x50 if you use c24 timber
at 400c of course
may be me misunderstanding lol but i thought the span for c24 6x2 was 3.39m internal span . i was allowing for the wall plate too which would be 6.98m plus the central support. if the 7m is internal measurement i will bow out graciously and say oops sorry .
my apologies mate i was commenting on freddies answer just to build my own knowledge. his reply of 7x2 is the one i would go for . i was just being a little bit cheeky to be honest.
no offence intended
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