Barney12 Posted February 21, 2018 Share Posted February 21, 2018 So when running 40 or 50mm waste in concrete what should be the correct procedure? Push fit/compresion? Link to comment Share on other sites More sharing options...
PeterW Posted February 21, 2018 Share Posted February 21, 2018 Push fit.... Ideally you need to connect above slab if possible, or use 110mm below slab and use an entry fitting to do the transition. Link to comment Share on other sites More sharing options...
Barney12 Posted February 21, 2018 Share Posted February 21, 2018 4 minutes ago, PeterW said: Push fit.... Ideally you need to connect above slab if possible, or use 110mm below slab and use an entry fitting to do the transition. OK, thanks. Its going to be a BIG decision to dig the run from the 110mm to the sink up as its going to be close to UFH pipes. Link to comment Share on other sites More sharing options...
Barney12 Posted February 21, 2018 Share Posted February 21, 2018 Actually digging it up just isn't going to be a safe/easy option. Just managed to find this (zoomed) image of the offending pipework. One corner of the sink waste goes across the UFH pipe. Its the pipe that was sat in the top of that grey boss that was un-bonded. Link to comment Share on other sites More sharing options...
Gone West Posted February 21, 2018 Share Posted February 21, 2018 I had this type of problem because a pipe moved after the slab was replaced. It was 110mm ducting for the water supply pipe and I used one of these to offset the entry a bit. http://www.ebay.co.uk/itm/110mm-x-40mm-Waste-Pipe-Adaptor-/291514309082?item=291514309082&ViewItem=&nma=true&si=U4LuuKCsZavH%2BzIQ7TlciRWA2Z4%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557 Link to comment Share on other sites More sharing options...
Gone West Posted February 21, 2018 Share Posted February 21, 2018 7 minutes ago, Barney12 said: Actually digging it up just isn't going to be a safe/easy option. Just managed to find this (zoomed) image of the offending pipework. One corner of the sink waste goes across the UFH pipe. Its the pipe that was sat in the top of that grey boss that was un-bonded. I'm no expert but that doesn't look right to me. I would have thought all that white pipe should be 110mm and under the slab not running through it. 1 Link to comment Share on other sites More sharing options...
Onoff Posted February 21, 2018 Share Posted February 21, 2018 8 minutes ago, Barney12 said: Actually digging it up just isn't going to be a safe/easy option. Just managed to find this (zoomed) image of the offending pipework. One corner of the sink waste goes across the UFH pipe. Its the pipe that was sat in the top of that grey boss that was un-bonded. Can't you just get your hand down there to clean the boss, brush on a good slug of solvent adhesive and push a bit of grey back down? Link to comment Share on other sites More sharing options...
Jeremy Harris Posted February 21, 2018 Share Posted February 21, 2018 1 minute ago, PeterStarck said: I'm no expert but that doesn't look right to me. I would have thought all that white pipe should be 110mm and under the slab not running through it. Same here, not a good layout IMHO. Link to comment Share on other sites More sharing options...
Barney12 Posted February 21, 2018 Share Posted February 21, 2018 5 minutes ago, Onoff said: Can't you just get your hand down there to clean the boss, brush on a good slug of solvent adhesive and push a bit of grey back down? Yep, and I think that's what I'm going to have to do. The runs of 50mm are fairly short and there is only a couple of solvent bends. Of course that does assume there is solvent on the other joints!! I guess I can try and rig some sort of pressure test up? Link to comment Share on other sites More sharing options...
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