Kripa Posted August 2, 2021 Share Posted August 2, 2021 (edited) Hi all, What is the advisable time frame (per mm) to leave sand cement screed to dry prior to tiling? Thanks a lot Edited August 2, 2021 by Kripa Link to comment Share on other sites More sharing options...
markc Posted August 2, 2021 Share Posted August 2, 2021 If you work on 1 day per millimetre for the first 50 and then 2 days per millimetre for additional you won’t be far off. Link to comment Share on other sites More sharing options...
nod Posted August 2, 2021 Share Posted August 2, 2021 (edited) As above But if you can’t wait that long you will need to use a decoupling Matt Im on with this one today 130m2 Screed has been down 10 days Customer if paying extra for the tiling on top of the 600k Large scale builders are always in a rush The longer you leave the screed the better But hardly any on spec builds are left to cure Edited August 2, 2021 by nod Link to comment Share on other sites More sharing options...
Adsibob Posted December 16, 2021 Share Posted December 16, 2021 On 02/08/2021 at 09:23, markc said: If you work on 1 day per millimetre for the first 50 and then 2 days per millimetre for additional you won’t be far off. I'm arguing with my builder about this. Very frustrating that he won't delay tiling. He wants to tile an 80mm screed after 70 days. The formula suggests 110 days. Is that really necessary? I don't really have space for a decoupling matt. Link to comment Share on other sites More sharing options...
Gone West Posted December 16, 2021 Share Posted December 16, 2021 8 minutes ago, Adsibob said: I'm arguing with my builder about this. Very frustrating that he won't delay tiling. He wants to tile an 80mm screed after 70 days. The formula suggests 110 days. Is that really necessary? I don't really have space for a decoupling matt. I don't know if this will be of any help. https://www.tileandstonejournal.com/featured-articles/green-screeds-what-we-should-know-before-tiling-them/ https://www.bal-adhesives.com/products/new-floor/ Link to comment Share on other sites More sharing options...
ToughButterCup Posted December 16, 2021 Share Posted December 16, 2021 On 02/08/2021 at 08:30, Kripa said: ... What is the advisable time frame (per mm) to leave sand cement screed to dry prior to tiling? ... Ask your screed company..... they'll have guide lines for you to follow. @Adsibob : consider you don't follow the guidelines and summat dreadful happens to your flooring (as a result) Who pays for the repair? Link to comment Share on other sites More sharing options...
Adsibob Posted December 16, 2021 Share Posted December 16, 2021 2 hours ago, ToughButterCup said: Ask your screed company..... they'll have guide lines for you to follow. @Adsibob : consider you don't follow the guidelines and summat dreadful happens to your flooring (as a result) Who pays for the repair? I absolutely agree. The problem is, he doesn't. I've at least managed to persuade him to wait until next year, by which time it will be 85 days. Hopefully by then the UFH is down in the upper floors (which aren't screeded) and they can work on tiling and flooring that. Sorry to have hijacked this thread! Link to comment Share on other sites More sharing options...
markc Posted December 16, 2021 Share Posted December 16, 2021 9 hours ago, Adsibob said: I'm arguing with my builder about this. Very frustrating that he won't delay tiling. He wants to tile an 80mm screed after 70 days. The formula suggests 110 days. Is that really necessary? I don't really have space for a decoupling matt. Asking your screed supplier is sound advice, as you are tiling then I can see scope to reduce the drying time as the floor finish won’t be susceptible to moisture and it’s unlikely you will be taking the screed to anywhere near is max compressive strength. drying time also depends on how wet the screed was when it was laid. Link to comment Share on other sites More sharing options...
SteamyTea Posted December 19, 2021 Share Posted December 19, 2021 On 16/12/2021 at 11:43, Adsibob said: I've at least managed to persuade him to wait until next year, by which time it will be 85 days We had an exceptionally mild autumn, so your screen should be OK. The 1mm/day is a bit of a hand wavy number. Wet processes in buildings cause so many problems. It is about time the industry moved on and stopped using them. Link to comment Share on other sites More sharing options...
Onoff Posted December 19, 2021 Share Posted December 19, 2021 100mm slab. Feb 2016: Then the wet room corner April 2018: Tiled the corner Aug 2018: I think it's the Irish who wonder what the English do with the time they save by rushing. I'm part Irish... Link to comment Share on other sites More sharing options...
TonyT Posted December 19, 2021 Share Posted December 19, 2021 Measure the RH of the slab to determine the ‘dryness’ you get accessories for RH probes that push the sensor into a foam like brick, the brick has an opening at one side and this is posed in the floor, you are then measuring the floor and not the room.. Link to comment Share on other sites More sharing options...
Adsibob Posted December 19, 2021 Share Posted December 19, 2021 32 minutes ago, TonyT said: Measure the RH of the slab to determine the ‘dryness’ you get accessories for RH probes that push the sensor into a foam like brick, the brick has an opening at one side and this is posed in the floor, you are then measuring the floor and not the room.. I have a fairly basic damp meter that I bought from Amazon a few years ago for about £24. It has two sharp prongs that you stick into the solid that you are taking a reading from. I use it mainly to check whether logs that I want to burn are dry, but I did also use it when I bought our house to show the estate agent that the house had obvious damp (even though it was obvious, the agent kept saying it was perfectly dry, and I couldn’t be bothered to get a surveyor in until the price came down a bit). Would such a basic meter work on checking the screed? I would probably only be able to get the two prongs 1mm into the screed, at most. But surely that top 1mm of the screed is the driest. Link to comment Share on other sites More sharing options...
Redoctober Posted December 19, 2021 Share Posted December 19, 2021 @Adsibob as an alternative you may try taping down a decent sized sit of plastic - leave it for 24hrs and then lift it up to see what if any moisture is underneath. Link to comment Share on other sites More sharing options...
Adsibob Posted December 19, 2021 Share Posted December 19, 2021 18 minutes ago, Redoctober said: @Adsibob as an alternative you may try taping down a decent sized sit of plastic - leave it for 24hrs and then lift it up to see what if any moisture is underneath. That’s an interesting idea. I might give that a go. Thanks! Link to comment Share on other sites More sharing options...
TonyT Posted December 19, 2021 Share Posted December 19, 2021 54 minutes ago, Adsibob said: I have a fairly basic damp meter that I bought from Amazon a few years ago for about £24. It has two sharp prongs that you stick into the solid that you are taking a reading from. I use it mainly to check whether logs that I want to burn are dry, but I did also use it when I bought our house to show the estate agent that the house had obvious damp (even though it was obvious, the agent kept saying it was perfectly dry, and I couldn’t be bothered to get a surveyor in until the price came down a bit). Would such a basic meter work on checking the screed? I would probably only be able to get the two prongs 1mm into the screed, at most. But surely that top 1mm of the screed is the driest. no that’s a resistance meter http://www.merlinlazer.com/MMS-Moisture-Meter---Moisture-Measurement-System we use this one with the foam brick Link to comment Share on other sites More sharing options...
Adsibob Posted December 19, 2021 Share Posted December 19, 2021 2 hours ago, TonyT said: no that’s a resistance meter http://www.merlinlazer.com/MMS-Moisture-Meter---Moisture-Measurement-System we use this one with the foam brick £563 ? No thank you. Link to comment Share on other sites More sharing options...
TonyT Posted December 19, 2021 Share Posted December 19, 2021 Same principal https://www.protilertools.co.uk/product/tilemaster-hygrometer-moisture-tester?gclid=Cj0KCQiAzfuNBhCGARIsAD1nu-8B7gdLOmy-oUXUPenZ3s_K_OrUVrHlKq7EyGYGZsKfnTs4EmXXc2MaAssyEALw_wcB buy and sell on? Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now