HughF Posted June 21, 2023 Share Posted June 21, 2023 (edited) I’ve got a 125mm slab going down next week in my extension, on 200 of pir. It’s not large, just 2.8x5…. Do I need to bother designing this in loopcad or can I just bang down some pipe on 150 centres and call it done? Plan is to run it off an ashp. Edited June 21, 2023 by HughF Link to comment Share on other sites More sharing options...
JohnMo Posted June 21, 2023 Share Posted June 21, 2023 With 200mm PIR you can can do just about any centres you like and still have low flow temps. Mine on 300mm and flow temp at zero degs outside is just under 30. On 150mm centers you gain a degree or so. I would just put it in - divide room into 2 one loop each side, so the loops are similar lengths. Put the supply pipe near the outside walls and return coming back out the middle. Done Link to comment Share on other sites More sharing options...
HughF Posted June 21, 2023 Author Share Posted June 21, 2023 Cheers…. That’ll work well as I’ve got a couple of shorter lengths of continal 16mm left over from another job Link to comment Share on other sites More sharing options...
HughF Posted June 23, 2023 Author Share Posted June 23, 2023 (edited) Something like this? 1-Drawing.PDF Or like this? 1-Drawing (easy-split).PDF Edited June 23, 2023 by HughF Link to comment Share on other sites More sharing options...
JohnMo Posted June 23, 2023 Share Posted June 23, 2023 I like the first one, as there appears to be less bends to do. Link to comment Share on other sites More sharing options...
HughF Posted June 23, 2023 Author Share Posted June 23, 2023 33 minutes ago, JohnMo said: I like the first one, as there appears to be less bends to do. Agreed, It was the first suggestion that loopcad spat out. I'll go with that then. Link to comment Share on other sites More sharing options...
HughF Posted June 26, 2023 Author Share Posted June 26, 2023 (edited) It turns out we’ve ended up with 240mm of PIR under the slab. That’s a result indeed. 100 and 140 cross laid (the 140 is left over from another job so we’ve only got to run the merchants for some 100mm. 40mm on the sides is the plan, as the pb and skirting will cover it Edited June 26, 2023 by HughF Link to comment Share on other sites More sharing options...
HughF Posted June 28, 2023 Author Share Posted June 28, 2023 (edited) Quick trip to site after work today to follow on behind the builders. My wife gave me a hand and it went down (sort of) according to plan in about an hour. Because of space constraints, I’m going to take the loops through a core in this wall then fit the manifold in the kitchen cupboard that’s the other side. Will press on some 16mm elbows and stuff all 4 through a 80mm ish core. Edited June 28, 2023 by HughF Link to comment Share on other sites More sharing options...
HughF Posted June 30, 2023 Author Share Posted June 30, 2023 Great success 5.2m3 down, including the porch footings and patio base. Puffed the pipe up to 5 bar. Link to comment Share on other sites More sharing options...
HughF Posted June 30, 2023 Author Share Posted June 30, 2023 So the take home is, yes, use loopcad to design your pipe layout. It made it dead easy to plan and told me which of my pipe offcuts would be long enough 🤣 Link to comment Share on other sites More sharing options...
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