There is a rule of thumb or more a guesstimation for working out the total span a length of joist can run before it needs additional support "i.e in the middle" it goes something like the width times the thickness = allowable span, but I can't for the life of me remember how to form the calculation, could you help me out please, cheers.
just a quick one please
- Thread starter chirpychippy
- Start date
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Thank you very much
half the span in feet, then apply the number to inches, then add 1 inch.
i.e a 10 foot room becomes 5 foot, which then becomes 5 inches, add 1 inch and you have the number.
6" x 2" joists.
or another way is to....
halve the depth of the joist in inches and you get the span of the joist in metres.
i.e. a 9" joist will span 4.5 metres whereas a 3.5m span will require 7" joists.
i would base all these on 400mm centres.
i.e a 10 foot room becomes 5 foot, which then becomes 5 inches, add 1 inch and you have the number.
6" x 2" joists.
or another way is to....
halve the depth of the joist in inches and you get the span of the joist in metres.
i.e. a 9" joist will span 4.5 metres whereas a 3.5m span will require 7" joists.
i would base all these on 400mm centres.
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anobium can type faster than me .
bah!
bah!
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