I've cut out a 1600mm section of rotten 9x3 joist and I plan to replace it with a fresh bit of 9x3. To join the two, I will screw another bit of 9x3 over the joint using M10 coach screws.
What length of overlap should be given on each side of the join and what is the required centre measurements for the coach screws?
What length of overlap should be given on each side of the join and what is the required centre measurements for the coach screws?