Jimbo37 Posted November 20, 2023 Share Posted November 20, 2023 Hi all. The architect spec'd to install 50mm of screed. Thing is, I think only 40mm was actually put in. I think this coz I marked the walls before the screed went in, and all suggest 40mm. In addition, 40mm is apparent around doors etc. I'm mindful that the centre of the floor could be deeper - any way of checking? 🤔 Link to comment Share on other sites More sharing options...
JohnMo Posted November 21, 2023 Share Posted November 21, 2023 Drill a hole down to insulation? Â 1 Link to comment Share on other sites More sharing options...
Jimbo37 Posted November 21, 2023 Author Share Posted November 21, 2023 @JohnMo im nervous, as there is ufh Link to comment Share on other sites More sharing options...
Conor Posted November 21, 2023 Share Posted November 21, 2023 You need ~15mm cover over the pipes, so about 16mm for a pipe, a couple mm sticking up here or there meaning you need a min depth of 35mm. They say min 50mm on basis you'll have high spots and it'll be thinner. There's not much you can do about it anyway. Move on to the next job. 2 Link to comment Share on other sites More sharing options...
markc Posted November 21, 2023 Share Posted November 21, 2023 It’s better to be under than over with screed, last thing you want is to be grinding off. What finish are you putting down? Have you checked for humps, bumps and high spots? 1 Link to comment Share on other sites More sharing options...
Kelvin Posted November 21, 2023 Share Posted November 21, 2023 1 hour ago, Jimbo37 said: @JohnMo im nervous, as there is ufh Given you can’t do anything about it now I’d forget about it. Certainly don’t go drilling holes in your screed. As long as you have enough cover over the UFH which is 16mm if its stapled to the insulation. I had the same mild panic with my screed depth albeit we were nominally at 55mm. What kind of screed is it? 1 Link to comment Share on other sites More sharing options...
Jimbo37 Posted November 21, 2023 Author Share Posted November 21, 2023 11 hours ago, Kelvin said: What kind of screed is it? Calcium sulphate Link to comment Share on other sites More sharing options...
Jimbo37 Posted November 21, 2023 Author Share Posted November 21, 2023 13 hours ago, markc said: What finish are you putting down? LVT, click vinyl or lino. A tad faffy on that 😳 Link to comment Share on other sites More sharing options...
Jimbo37 Posted November 21, 2023 Author Share Posted November 21, 2023 13 hours ago, markc said: Have you checked for humps, bumps and high spots? Looks very good Link to comment Share on other sites More sharing options...
saveasteading Posted November 21, 2023 Share Posted November 21, 2023 Nobody is going to fall through the floor at 40mm. Think of the thickness of a paving slab. If you've got no signs of ufh pipes at the surface then that has worked out OK too. 1 Link to comment Share on other sites More sharing options...
markc Posted November 21, 2023 Share Posted November 21, 2023 Sounds like at the worst you need thicker underlay of flooring to make up the level if needed. 1 Link to comment Share on other sites More sharing options...
saveasteading Posted November 22, 2023 Share Posted November 22, 2023 But if you've paid for 50mm and its a big area, then there should be a rebate. 1 Link to comment Share on other sites More sharing options...
Jimbo37 Posted November 22, 2023 Author Share Posted November 22, 2023 7 hours ago, saveasteading said: But if you've paid for 50mm and its a big area, then there should be a rebate Agreed @saveasteading, but I'm unsure if I'll follow this through as my main concern is the quality of what I have and the general consensus is that its fine. To go for cost rebate, I'd have to be 100% sure of depths in middle of floor, which presumably would call for a couple of drill holes, which is a taking from quality and would rankle the builder if I'm wrong - on balance, I think it's best to move on. 3 Link to comment Share on other sites More sharing options...
dpmiller Posted November 23, 2023 Share Posted November 23, 2023 who did the install? Our guy was very open about his calculations, pointing out every high or low spot on the PIR. The subfloor was poured as three slabs and the middle one ended up with a bit of a dish, so our hallway has closer to 65mm. 1 Link to comment Share on other sites More sharing options...
crispy_wafer Posted November 23, 2023 Share Posted November 23, 2023 Presuming it was a flow screed pour? If so the screed supplier would have records as to how much was poured.  1 Link to comment Share on other sites More sharing options...
saveasteading Posted November 23, 2023 Share Posted November 23, 2023 13 hours ago, Jimbo37 said: think it's best to move on. It usually is. 1 Link to comment Share on other sites More sharing options...
Kelvin Posted November 23, 2023 Share Posted November 23, 2023 3 hours ago, crispy_wafer said: Presuming it was a flow screed pour? If so the screed supplier would have records as to how much was poured.  Yes the guys that did mine had those wee spider level things and marked on a sheet the screed depth at each one. 1 Link to comment Share on other sites More sharing options...
Andehh Posted November 23, 2023 Share Posted November 23, 2023 5 hours ago, saveasteading said: It usually is.  Very much agree! 1 Link to comment Share on other sites More sharing options...
saveasteading Posted November 23, 2023 Share Posted November 23, 2023 4 hours ago, Kelvin said: those wee spider level things Great description. So they set the arachnids, dipped the levels and ordered the exact amount of screed? Clever. No waste? There is always some, or they're scraping out the mixer for some more. 1 Link to comment Share on other sites More sharing options...
crispy_wafer Posted November 23, 2023 Share Posted November 23, 2023 13 minutes ago, saveasteading said: So they set the arachnids, dipped the levels and ordered the exact amount of screed? Clever. almost...  straight out of the volumetric mixer truck  1 Link to comment Share on other sites More sharing options...
joe90 Posted November 23, 2023 Share Posted November 23, 2023 4 hours ago, Kelvin said: Yes the guys that did mine had those wee spider level things and marked on a sheet the screed depth at each one. Same with me (but a towable mixing/pumping trailer) 1 Link to comment Share on other sites More sharing options...
Kelvin Posted November 23, 2023 Share Posted November 23, 2023 22 minutes ago, saveasteading said: Great description. So they set the arachnids, dipped the levels and ordered the exact amount of screed? Clever. No waste? There is always some, or they're scraping out the mixer for some more. Yes very little waste. 1 Link to comment Share on other sites More sharing options...
Kelvin Posted November 23, 2023 Share Posted November 23, 2023 Just now, joe90 said: Same with me (but a towable mixing/pumping trailer) Yes they dropped off the twoable pump the day before. All very slick. Team of three guys,  lorry driver and another guy came to check it and sign off. In and out before my other half managed to drive from the rental to watch the pour. 😂 1 Link to comment Share on other sites More sharing options...
Kelvin Posted November 23, 2023 Share Posted November 23, 2023 11 minutes ago, crispy_wafer said: almost...  straight out of the volumetric mixer truck  That would never have got in my drive! 1 Link to comment Share on other sites More sharing options...
saveasteading Posted November 23, 2023 Share Posted November 23, 2023 Volumetric is great for supplying the exact quantity. I didn't know that any would do a pump mix. 1 Link to comment Share on other sites More sharing options...
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