I'm planning a loft conversion and trying to plan how big the room can be. This will depend on the span I can achieve.
Looking at span tables such as these : http://www.salford.gov.uk/timber-floors.pdf , using a 147 x 75 I can achieve a span of 3.56m, with a 400mm pitch.
So, my question is, if I double the joists up, what will the span be increased to? I have looked around on the net quite a bit but cant find any info on the increase in strength / span from doubling / trippling timber?
Looking at span tables such as these : http://www.salford.gov.uk/timber-floors.pdf , using a 147 x 75 I can achieve a span of 3.56m, with a 400mm pitch.
So, my question is, if I double the joists up, what will the span be increased to? I have looked around on the net quite a bit but cant find any info on the increase in strength / span from doubling / trippling timber?