hi, we had a side return extension built and the builders installed a water UFH system. they poured concrete on top of this during the peak of hot weather in the summer and the back of the house was uncovered and exposed to the heat. we had also purchased Amtico from a reputable suppler who came to do a floor inspection. There were obvious cracks in the concrete and when tapped some of the floor sounded hollow and when started crumbling with tapped lightly. The amtico fitter requested that the builder dig back the blown areas and reset with more concrete. However our builder also laid some latex all over the whole floor. Three weeks later this has also cracked and is starting to lift. The Amtico fitter said the floor probably cannot be salvaged and would need to be taken back to the pipes and a liquid screed poured. He is not guarantying we can use Amtico even after this. I really need an expert opinion on what to do. I have called my home insurance company but have not heard back. Any advice or recommendations for an expert would be appreciated. Pics below
Typical builder....'ill put some latex screed over it and it'll be fine' All needs redoing, dug up and start fresh, whoever takes it up needs to be extra careful with your pipes but by sounds of it, it'll come out in chunks anyway
Builder is saying some parts are fine (not hollow when tapped) so is refusing to dig up the whole floor. kitchen has also been fitted on top of it but there are no piper under the kitchen units
Kitchen in aswell....oh dear. Has the top screed that the builder put down cracked everywhere or just where the hollow bits are?
It’s not good enough for a bonded floor. This happens a lot unfortunately. I’ve literally just had to send back 100 m2 of Amtico because of the same thing. You will need to use a floated system. Dig out the worst and repair. I would want a guarantee off the builder incase more starts to come up in the future
You should be able to get a refund. Basically you can’t bond to the subfloor so you would need to float over it using a underlay. So laminate. Engineered wood, or possibly tiles on a decoupling mat. If you have bifold doors and they are south or west facing you should avoid any clic vinyls as it’s not stable enough. Some ridged clicks may survive but I wouldn’t risk it
I'd always question why is some ok and some bad. Will the ok parts eventually turn bad. Dig up and start again if it wasn't done properly Sent from my SM-G998B using Tapatalk
thanks - we are digging up but amtico fitter says we need to use Cemfloor liquid screed at a cost of 3000 pounds. is this overkill? He has said he would then need to add two layers of compound at a cost of 1200. so my amtico will be around £8000 for an 8x4 m space. My builder wont agree to add cemfloor but hasn't provided other options.
Cemfloor therm will do the job well, the builder will need to get it to sr2 (5mm discrepancy over a 2m length) then the amtico fitter needs to get it to sr1, to be fair it may be possible to only need one layer of screed but it depends on how the builder leaves the subfloor, I think he’s hedging his bets from what he’s seen of the base you have now and I couldn’t blame him, pricing looks pretty fair to be honest but considering the builders cock up they should be footing the cemfloor bill. Sent from my iPhone using Tapatalk
If you have a new liquid screed I don’t see why you would need two coats of levelling compound? Think it’s a job they don’t want
may only problem with jumpax is they are only giving 5 year guarantees on their subfloors. I think that’s inadequate for a lvt or any hardfloor really. But it could work tbf
