Conor Posted June 17, 2021 Share Posted June 17, 2021 We have our waste pipes coming up through the slab. Most are well above the slab and will connect to black pipes above the FFL. There are one or two that finish just above the slab, and was planning on just using black pipe for these as I have all the fittings. Is the insulation/screed zone considered underground and do I have to use underground pipe? Would hate to use the black stuff only for BC guy to tell me to lift it... Link to comment Share on other sites More sharing options...
Mr Punter Posted June 17, 2021 Share Posted June 17, 2021 I don't think there is much in it. Use whatever you have. I understand the soil pipe may be more UV resistant than the below ground. Link to comment Share on other sites More sharing options...
cwr Posted September 8, 2021 Share Posted September 8, 2021 I've been wondering about this too, specifically whether 'underground' pipe and fittings can be used above ground if boxed in. Much cheaper and more fitting options (and I have a few spare bits) being my reasoning. I would imagine that the above ground stuff has additives to minimise uv degradation, but that would hardly matter for a boxed in installation. Decided to phone our local building control office (in NI) today to see what they though, they said no particular reason to not use underground parts if boxed in. Link to comment Share on other sites More sharing options...
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