I am intending to build an extension on top of an existing flat roof which means the existing roof joists will become the new floor joists.
The joists are 150 x 50 at 400 ccs with a 2 metre span. Will these be adequate as floor joists or do I need to think about beefing them up?
Thanks for any input.
The joists are 150 x 50 at 400 ccs with a 2 metre span. Will these be adequate as floor joists or do I need to think about beefing them up?
Thanks for any input.