my mate asked me to check out a floor and sort a couple tiles that had 'lifted' :lol: opinions?? :shock: tiles got fitted 5weeks ago I have additional info, but i wanna see what folks thinks first
opinions ?...................... just glad it wasn't me that fitted them :? ! As you know I'm no expert but there didn't look to be any primer under the screed ? Tiles look to have expanded - underfloor heating(if their is any) being brought up to temp too quick , or maybe lack of acclimatization. Im just guessing using my limited knowledge !
mate laid the screed (300 hd) om first day, plumbers had belted on the heating on the underfloor heating to test it, he went mad at them as he had already told the customer that heating had to be off/down at lowest etc laid the tiles the next day, 5.5 weeks later this happened. He said he thought it be the underfloor heating being on full belt that done it, but had no idea it be that bad as he hadnt been back to see it. Ive already told him its a rip up and start again job I did notice the lack of primer myself and asked him why he didnt, he said the floor already had some sort of screed down and didnt need it. Hes getting the balls rep up to have a look, as as he doesnt think he should take the hit for over eager plumbers tricky one tho imo And yes, im glad i never fitted them either :lol:
the reason why underfloor heating blows screeds is because it forces moister to the surface very fast. That compound has also not been mixed correct. So basically caused by moister, lack of primer and poor mixed compound. If all these was correct then that floor would of survived. It would be gapping you would most likley be looking at not a blown screed. Are you sure he used 300hd?
Looking at the pictures again, is it scrapped on? cant work out if he scrapped it on or if its at 3mm? Reason i ask if its 300HD is, the way 300hd cracks is in large sections. In the picture the cracks are very small which would indicate a latex product. However if he has mixed it with way to much water or has put it on very thin then you get the same small crazing (cracks)
You know, i never thought to check the thickness of the screed attached to the tile Im gonna see if i can free up some time to go lift it and prep soon, will check then
He did indeed phone me but unfortunately I'm up to my eyes in the workshop..... i have flooring jobs to do but none that I have time to do this week. Under a wee bit of pressure from several upholstery customers at the moment. Mick said it wasn't a problem.... I do have a local carpet to do which wouldnt have taken long but there is nooooooo way i'd be taking anyone into this particular house. So , i will just have to continue being the dunce in the corner I'm afraid !
Make sure you check the moister in the subfloor. Even if you start up the underfloor heating slowely it will still blow the screed if there is moister present depending on what the RH is. Also note that surface DPM's are not to be used over under floor heating. Concrete floors with underfloor heating in have to be dried naturally.
Good set out though, I like the way strip is centred on the toilet. What tiles are they Mike and what's going down now.
update Im going back next week to lay new screed, fit tiles, customer just has to pay me for fitting em pita really
company I used to be employed by had a big problem with moisture in screed underfloor heating and amtico laid on 300, a large building company had got a company in to lay the floor but went bust after latexing it all and couldnt lay the tiles, so said builders offered to pay upfront for fitting if we could do shirt work 24 hours a day for 5 days till hand over so in we went 1800 metres laid job done everyone happy until a week later when tiles started popping up with a thin layer of 300 stuck to the back of the tiles where the latex had just separated, only found out later that screed was only 4 months old no roof on for 3 of them and they cleared 4 inchs of water off floor day before latexing but floor layers told them to blast the floor heating as hot as poss for as long as poss and it will dry in couple of days, 3 years later old company is still being paid to go back now and again and f61 tiles back down
