On the john guest site they say this:
I have looked at Doucument A and just can't find refference to this. Any help anyone? Jono
Traditional joists
Instructions on the drilling of joists is given in the Building Regulations Approved Document A, and summarised as follows:
1. Holes should be no greater than 0.25 of the depth of the joist.
2. Holes should be drilled at the neutral axis.
3. Holes should not be less than 3 diameters (centre to centre) apart.
4. Holes should be located between 0.25 and 0.4 times the span from the support.
I have looked at Doucument A and just can't find refference to this. Any help anyone? Jono