I'd like to replace an ageing lean-to built between my house and garage. It's 6.2m x 4.2m, built from 4x2, plastic corrugated roof with a supporting wall about 1m along the 4.2m width (joists run in the direction of the 4.2m width).
I plan to remove the supporting wall section and replace the roof with a flat felt roof on top of plywood sheets. The roof doesn't need to bear much load, although I (or someone) will probably have to get on to parts of it to lay the felt.
How do I work out what sized joists I need?
How far apart should they be spaced?
TIA!
I plan to remove the supporting wall section and replace the roof with a flat felt roof on top of plywood sheets. The roof doesn't need to bear much load, although I (or someone) will probably have to get on to parts of it to lay the felt.
How do I work out what sized joists I need?
How far apart should they be spaced?
TIA!