Marvin Posted February 6, 2022 Share Posted February 6, 2022 My brother-in-law was discussing trying to prepare for the gas pipework route for his new kitchen. This is the pipework after the gas meter. He tells me that he thought it could run under the suspended timber floor if he used Tracpipe is this right? He is concerned as the only way around the building otherwise would be along the external wall down the side path exposed to possible damage. What's the regs on this? Link to comment Share on other sites More sharing options...
Temp Posted February 6, 2022 Share Posted February 6, 2022 The void under suspended wood floors should be ventilated so I think it's OK. Thinking the pipe to use is Kuterlex coated copper but best ask a Gas Safe engineer what the rules are. Link to comment Share on other sites More sharing options...
Marvin Posted February 6, 2022 Author Share Posted February 6, 2022 Thanks @Temp. If you can't used a ducted pipe in these circumstance then I wonder what the he'll you can use it for! Link to comment Share on other sites More sharing options...
Radian Posted February 6, 2022 Share Posted February 6, 2022 1 hour ago, Marvin said: He is concerned as the only way around the building otherwise would be along the external wall down the side path exposed to possible damage. Nice big fat 28mm pipe looping up over windows & doorways. That seems to be what Gas Safe thinks is the bees knees these days. I have a rental property where they insisted on switching out 15mm from the meter to 22mm when fitting a new boiler. Only way was round the side of the house but that was a shared corridor so they poked it right through a ground floor room and out the back wall. Then they ran it over the top of a brick barbecue I'd built against the back wall ? 1 1 Link to comment Share on other sites More sharing options...
Marvin Posted February 6, 2022 Author Share Posted February 6, 2022 32 minutes ago, Radian said: Nice big fat 28mm pipe looping up over windows & doorways. That seems to be what Gas Safe thinks is the bees knees these days. I have a rental property where they insisted on switching out 15mm from the meter to 22mm when fitting a new boiler. Only way was round the side of the house but that was a shared corridor so they poked it right through a ground floor room and out the back wall. Then they ran it over the top of a brick barbecue I'd built against the back wall ? So what's the point of this pre-ducted flexi gas pipe then? Link to comment Share on other sites More sharing options...
Marvin Posted February 6, 2022 Author Share Posted February 6, 2022 (edited) 37 minutes ago, Radian said: so they poked it right through a ground floor room and out the back wall. Hang on. An exposed pipe high up on the wall INSIDE? ?? WTF! Edited February 6, 2022 by Marvin Link to comment Share on other sites More sharing options...
Radian Posted February 6, 2022 Share Posted February 6, 2022 1 hour ago, Marvin said: Hang on. An exposed pipe high up on the wall INSIDE? ?? WTF! About 5m long, just above skirting. looks lovely. ? All in the name of safety of course, but the muppet didn't think there'd be an issue running it over the top a barbeque Wish I'd taken a photo before I demolished it. Link to comment Share on other sites More sharing options...
Temp Posted February 6, 2022 Share Posted February 6, 2022 Rather old but.. https://www.diynot.com/diy/threads/vented-gas-pipe.178146/ Corgi TB 217 clarified this issue. Gas pipes in floor voids don't require extra ventilation. Pipes in ducts require ventilation if the cross sectional area is greater than 0.01 square metres or a volume of less than 0.1 cu m. Google says TB 217 is now renumbered TB 113. Sadly it appears you need to be gas safe registered to access the technical bulletins. Link to comment Share on other sites More sharing options...
Temp Posted February 6, 2022 Share Posted February 6, 2022 https://www.gassaferegister.co.uk/media/1715/bs-6891-2015-installation-and-maintenance-of-pipework-of-up-to-35mm.pdf Para 8.9.9 on page 33 suggest pipes can be run in floor voids provided they are ventilated to some standard. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted February 6, 2022 Share Posted February 6, 2022 If it’s a ventilated void, just pull a copper pipe through and it’s perfectly fine as is. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted February 7, 2022 Share Posted February 7, 2022 Just remember to sleeve the pipe when passing through structures with a cavity, sealing the open ends of the sleeve on the side which would allow any accumulated gas in the sleeve ( in the event of damage ) to escape to atmosphere or the ventilated space. 1 Link to comment Share on other sites More sharing options...
Marvin Posted February 7, 2022 Author Share Posted February 7, 2022 5 hours ago, Nickfromwales said: Just remember to sleeve the pipe when passing through structures with a cavity, sealing the open ends of the sleeve on the side which would allow any accumulated gas in the sleeve ( in the event of damage ) to escape to atmosphere or the ventilated space. Understood. Was going too anyway but thanks for commenting. 1 Link to comment Share on other sites More sharing options...
Carrerahill Posted February 7, 2022 Share Posted February 7, 2022 (edited) 18 hours ago, Marvin said: My brother-in-law was discussing trying to prepare for the gas pipework route for his new kitchen. This is the pipework after the gas meter. He tells me that he thought it could run under the suspended timber floor if he used Tracpipe is this right? He is concerned as the only way around the building otherwise would be along the external wall down the side path exposed to possible damage. What's the regs on this? You can use standard copper pipe with soldered joints under a floor. The solumn should be ventilated? Yes? If not, worry about that more than the pipe! A lot of misconceptions perpetrated by the trades who are getting lazier by the day. Edited February 7, 2022 by Carrerahill 1 Link to comment Share on other sites More sharing options...
Hilldes Posted February 7, 2022 Share Posted February 7, 2022 Here’s my thread from a few months back. It depends I think on what type of suspended floor - mine was a ground floor, beam and block. 1 Link to comment Share on other sites More sharing options...
Marvin Posted February 7, 2022 Author Share Posted February 7, 2022 7 minutes ago, Hilldes said: Here’s my thread from a few months back. It depends I think on what type of suspended floor - mine was a ground floor, beam and block. Yes thanks for that. I had read it a couple of nights ago. Link to comment Share on other sites More sharing options...
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