Hi I am having to shift my kitchen. The waste pipe which I believe has to be
35mm is going to have to go under a joist (or through). If go under the joist, I lose the slope required to take away waste. If I go through it do I breach building regs ? The joist runs parallel to an interior wall (old tenement flat) about 10cm away. I'm in Edinburgh dont know if regs vary with location. Thanx in advance. Dave.- posted
20 years ago