John Rumm wrote in
o.uk:
On 26/06/2019 18:17, DerbyBorn wrote:
I need to bore a hole in a joist to take a shower waste. Reading the
regs tells me that in a 20cm Joist the max hole can be 32mm
I need to pass a pipe of 42mm diameter!
The joist is right next to a wall at the outer edge of the house -
load on it will never be high.
Pragmatically - would you go ahead and bore the hole?
Yes.
(noting a hole in the centre is better mid span, and a notch better
near the ends)
I now reckon I am okay up to 50mm on a 200mm deep joist:
https://www.labc.co.uk/news/how-get-...-solid-timber-
joists