ceiling joist spans

Postby fenderman » Thu Dec 11, 2008 11:09 am

Can anyboby tell me the span for 6"x 2" at 8"/ 200mm centres or if they were doubled ie bolted together to be 6"x 4" at 16"/ 400mm centres
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Postby stoneyboy » Sat Dec 13, 2008 10:41 am

There is not straight answer to this question.
If you were to use graded timber (C14) and it was 150x50 at 400mm centres the beams could take a UDL of 75kg/sqm over a 3m span. Your suggestion to double up the timbers and double the centres would make no gain.
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Postby Perry525 » Tue Dec 16, 2008 6:50 pm

It is traditional to increase the thickness of a joist where it will carry the weight of an upstairs fireplace or to double the joists when carrying a upstairs block wall.
What are you trying to do?
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