This is my first time so apologies if this is posted to the wrong area!!
I am getting a new boiler installed and also have several other pipes to get through the walls. I'm unsure what core drill sizes to select for the following pipes:
condensing boiler flues has to rise away from the boiler so this hole has to be larger than the flue 120 - 140mm i would say. The condensate and the washing machine pipe will not require any clearance, as they are plastic and will not corrode if in contact with bricks and mortar.
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