Dents in screed appearing under LVT

The screed pulls as it sets. Lifting anything that isnt solid or well fixed. This is why we would always do two coats. One to set the pipes and then a heavy coat to get the depth. Whats really unhelpful is that some manufacturers are stating the 10mm coat needs to be done in one coat.

 

6mm is too thin to start with!

 

Yeah I was told to do it in one coat. As we’ve discussed on here, I’m doing it in two. Good to know about the first pour getting the pipes set and then a heavier pour afterwards. I was going to go for 2/3 on the first pour and 1/3 on the second pour. The other way around is better though? 15mm total measured pour to finish 10mm hopefully.


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Defo 2 coats for me, like to flood it as much as I can to atleast cover the pipes then another good coat. They say aim for 10mm, I probably hit nearer 15mm by time I'm done and tend to always use more bags than I planned

 

Thanks everyone for your really helpful responses. Some really interesting points raised. I have attached a screenshot of the pdf where it states “pour a 5mm bed of renovation screed….”. Interestingly, this appears to have been changed on other documents to at least 5mm. All the specified products were used correctly and supplied by Wunda. A Mapei rep came out and said they would recommend at least 6mm and that the product is so ’grippy’ that it can pull when curing. The fitter and I have dug up the flooring today and this looks to be what’s happen as the pipes can be pushed down now which was certainly not the case when the screed was poured and the screed is thinner over the pipes which fits with the pipes lifting. There is at least 5mm either side. I have been speaking with Wunda today and I’m to put in writing what is going on so we’ll see. I hope they take responsibility and I don’t have to fight them on this but I’ll have to. I just want my floor sorted out, I was so looking forward to this being done and at the moment I’m wishing I still had radiators and laminate!!

 

Here’s the image

 

I think most customers that go down the ufh route wish they had gone for radiators

 

My electric ufh is under 20mm of reno, wifi thermostat has been going rogue, checked my app and it was on 31deg ...my poor frenchy must have thought I'd dumped her in a desert...but amtico didn't budge luckily. Makes me wonder

Anyway I often wonder if it did go tits up what I'd do as I have no rads and it's near 45m2 area

 

Did you use Amtico ht or something else? Wet set? I have a friend who has Amtico ht and we thermal gunned his floor last summer at 40 degrees in the sun. Stuck fine.
I think I’ll perhaps use something else though when I do my Amtico, f48plus or the uzin Ht one.


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I'm always uzin ke49 mostly and I laid my own parquet semi wet with an A2 notch trowel.
It's not what the adhesive can handle, it's the lvt itself hence why they fade but the back of my extension is more or less fully open with bifolds and picture frame window, plenty of sunlight but later on in the day (not south facing) but yes some of the temps I've heard customers running their LVT at with ufh goes way past 30deg but I don't know why because for me anything above 25 is too much, even in the winter it's nice enough.

 

F48+ is a decent adhesive though, used that a handful of times and does have a real good grab to it.

 

Can you explain laying semi wet? Assuming that’s also rolled? Thanks


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When I use Ke66 I go straight in with the planks more or less, maybe a few mins in...

With ke49 I leave a little longer before I placement, 49 is more forgiving with the timescale side.

So if I was to do 6 Row planking with Ke66 I'd do it in 2 rows wheres 49 I'll do the full 6 rows and yes rolled after 10mins or so then rolled again after 15mins or so

 

Lovely thanks


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Amtico HT extra is good now. I think it goes up to 38 degrees and guaranteed in direct sunlight. we use that and karndean universal mostly now.

 

Ball 58plus

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Having worked within the ufh market for a few years and Flooring for 23/24 years, I’ve found that not until recently each industry does it’s own thing, a few years ago they started working together and using each others knowledge to try and tidy up the build ups, a few are ahead of the rest though, they will all catch up. They have too as it’s where the money is.