Gone West Posted April 11, 2019 Share Posted April 11, 2019 11 hours ago, Oz07 said: @JSHarris @PeterStarck digging yours up anytime soon Come off it, I've had mine dug up once already. Link to comment Share on other sites More sharing options...
Onoff Posted April 11, 2019 Share Posted April 11, 2019 (edited) 6 minutes ago, ADLIan said: In constant contact with moisture, say under a DPM Well there you go. Everyone of our "eps" layers are on free draining compacted sub bases. Hardly moist! I'd suggest your comments are irrelevant. Stop scaremongering so we can put our Kangos away! ? Edit: Do you have shares in a DPM company? Edited April 11, 2019 by Onoff Link to comment Share on other sites More sharing options...
Gone West Posted April 11, 2019 Share Posted April 11, 2019 Our EPS raft is laid on 50mm granite fines for drainage and the EPS is Peripor which has very high compressive strength and has very low water absorption. Link to comment Share on other sites More sharing options...
ADLIan Posted April 11, 2019 Share Posted April 11, 2019 I didn't want to scare monger just giving information that is freely available from EPS manufacturers. Your house will not fall down or be ejected into oblivion but the thermal performance of the EPS will be slightly worse. I do not have shares in any DPM or insulation companies. I am aware of Peripor this is one of the enhanced moisture resistance products. If the manufacturers are OK with a free draining sub base then fine. 1 Link to comment Share on other sites More sharing options...
Jeremy Harris Posted April 11, 2019 Share Posted April 11, 2019 Someone (think it may have been @SteamyTea) did an experiment with samples of EPS to see whether it absorbed water or not. This was years ago, either on Ebuild or possibly on the GBF. Samples were left submerged in a bin full of water for a long time, then weighed to see how much water they had absorbed, and the result was close to sod all. In the case of EPS laid on top of a drainage layer, there's never going to be any hydrostatic pressure to push water even slightly into the EPS, so it's very hard to see how any water could be absorbed. The stuff is naturally moderately hydrophobic anyway, so there won't be any capillary effect to "suck" moisture up into it. The only case where I can see there being very slight thermal performance degradation happening is for the case where the stuff is used around a basement, where there may well be hydrostatic pressure pushing a tiny amount of moisture into the EPS. Link to comment Share on other sites More sharing options...
Pocster Posted April 11, 2019 Author Share Posted April 11, 2019 8 hours ago, Onoff said: @pocster, are you having a pumped liquid screed at "only" 60mm? I believe that’s what the ufh company has said . Erm , that not the best ??? Link to comment Share on other sites More sharing options...
Onoff Posted April 11, 2019 Share Posted April 11, 2019 12 minutes ago, pocster said: I believe that’s what the ufh company has said . Erm , that not the best ??? Really good I believe actually but expensive? Smooth as finish wise going by some pictures on here, like glass. Link to comment Share on other sites More sharing options...
ADLIan Posted April 11, 2019 Share Posted April 11, 2019 @JSHarrisJeremy - I would refer you to manufacturers test data on this one. Insulation in floors under the DPM can also experience the same hydrostatic pressure as basement walls (unless very well drained) 1 Link to comment Share on other sites More sharing options...
Pocster Posted April 11, 2019 Author Share Posted April 11, 2019 41 minutes ago, Onoff said: Really good I believe actually but expensive? Smooth as finish wise going by some pictures on here, like glass. Not priced the screed yet but can guess . Now if only I could sell some glazing to pay for it ... Link to comment Share on other sites More sharing options...
Jeremy Harris Posted April 11, 2019 Share Posted April 11, 2019 4 minutes ago, ADLIan said: @JSHarrisJeremy - I would refer you to manufacturers test data on this one. Insulation in floors under the DPM can also experience the same hydrostatic pressure as basement walls (unless very well drained) I was referring to the pretty much standard, EPS on drainage layer, passive slab arrangement. Both @PeterStarck's slab and ours (plus several others here) are built on a layer of well-drained ballast, so, as I said, there is no hydrostatic pressure to push water into the EPS. In our case, we have 200mm of Type 3, blinded with ~50mm of coarse grit, under the EPS, and 100mm land drains around the periphery, under the edge of the ballast, to ensure that it's well drained. In addition, the base of the EPS is at ground level anyway, the photo below shows the layer of Type 3 before it was blinded and the EPS was laid. It's really hard to see how water could be pushed upwards into the EPS. Link to comment Share on other sites More sharing options...
Ed Davies Posted April 11, 2019 Share Posted April 11, 2019 2 hours ago, Onoff said: Everyone of our "eps" layers are on free draining compacted sub bases. Hardly moist! Mine wouldn't have been, at least easily. Water table == ground level or higher on my site most of the year so some care to get the bottom of the EPS out of the ground would have been needed. This was one of the things which made me concerned about a passive slab so @ADLIan's comments are relevant in some cases. 1 Link to comment Share on other sites More sharing options...
Pocster Posted April 11, 2019 Author Share Posted April 11, 2019 So here’s the bathroom At far end shuttered section for inner timber frame for hidden cistern Directly in front where Porto loo is - the bath section . To the right shower tray area Plan is ufh and screed only go in the other area . So cistern , bath , shower dealt with at a later date ( like years from now ? ) Bit like brexit tbh ? Link to comment Share on other sites More sharing options...
Onoff Posted April 11, 2019 Share Posted April 11, 2019 4 minutes ago, pocster said: like years from now ? ? Respect! Link to comment Share on other sites More sharing options...
Pocster Posted April 11, 2019 Author Share Posted April 11, 2019 29 minutes ago, Onoff said: ? Respect! Lol ! I’ll get murdered in my sleep before then ? Link to comment Share on other sites More sharing options...
Mr Punter Posted April 11, 2019 Share Posted April 11, 2019 @pocster if you have the depth you could get a sand / cement screed laid at 75mm which could work out cheaper and will take tiles without needing to prime or clean. Link to comment Share on other sites More sharing options...
Pocster Posted April 11, 2019 Author Share Posted April 11, 2019 47 minutes ago, Mr Punter said: @pocster if you have the depth you could get a sand / cement screed laid at 75mm which could work out cheaper and will take tiles without needing to prime or clean. Yeah I’m not sure what I should have to be honest . i was allowing 150mm insulation 50/60mm screed and ufh Then 20mm ( ish ) for tile and adhesive I also assumed a liquid self levelling screed . Screeder looking tomorrow see what he says ? Link to comment Share on other sites More sharing options...
vfrdave Posted April 15, 2019 Share Posted April 15, 2019 On 11/04/2019 at 15:14, pocster said: I also assumed a liquid self levelling screed Cemfloor if you can get it over there is a great job. Had mine done last Thurs. 1 Link to comment Share on other sites More sharing options...
Pocster Posted April 16, 2019 Author Share Posted April 16, 2019 Well ! screeders been He said sand and cement barrowed in ! ? I assumed he would suggest liquid screed like everyone uses in grand design . Apparently liquid screed material cost is naturally more expensive and isn’t as level as people think ! He was implying that the labour is cheaper than the material therefore use cheap materials ! what do we all think ? . He also said sand and cement screed has to be at least 60mm with ufh to avoid tikes cracking Link to comment Share on other sites More sharing options...
Pocster Posted April 16, 2019 Author Share Posted April 16, 2019 Costs in materials and labour 130m sq sand cement £2200 60mm Liquid £2400 50mm Thoughts ??? Link to comment Share on other sites More sharing options...
Onoff Posted April 16, 2019 Share Posted April 16, 2019 2 minutes ago, pocster said: Thoughts ??? You can afford it! ? Link to comment Share on other sites More sharing options...
Pocster Posted April 16, 2019 Author Share Posted April 16, 2019 Just now, Onoff said: You can afford it! ? Lol F’ing can’t ! i think ( as the price difference is nominal ) any more benefits for choosing one over the other ? Link to comment Share on other sites More sharing options...
Mr Punter Posted April 16, 2019 Share Posted April 16, 2019 If they are good I would have sand cement. I thought 70mm was standard, not 60mm. Does it have fibres? Link to comment Share on other sites More sharing options...
Pocster Posted April 16, 2019 Author Share Posted April 16, 2019 2 minutes ago, Mr Punter said: If they are good I would have sand cement. I thought 70mm was standard, not 60mm. Does it have fibres? No idea about fibres - i’ll Ask . Why would you choose sand / cement over liquid @Mr Punter ? Link to comment Share on other sites More sharing options...
Mr Punter Posted April 16, 2019 Share Posted April 16, 2019 (edited) 5 minutes ago, pocster said: No idea about fibres - i’ll Ask . Why would you choose sand / cement over liquid @Mr Punter ? You don't need to do any prep before you tile it and if the screeder is good it is smooth and flat enough to lay any flooring (LVT etc) whereas sometimes you can get little ripples and bubbles with liquid. https://www.ukscreedsltd.co.uk/preparing-liquid-screed-floor-tiling/ Edited April 16, 2019 by Mr Punter 1 Link to comment Share on other sites More sharing options...
Pocster Posted April 16, 2019 Author Share Posted April 16, 2019 7 minutes ago, Mr Punter said: If they are good I would have sand cement. I thought 70mm was standard, not 60mm. Does it have fibres? Just googled screed depth and got a variety of answers .... It’s unbonded and we will assume fibres in it . Link to comment Share on other sites More sharing options...
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