hi there, we had an extension to the back of our house 12 months ago and karndean throughout (the existing and new part of the house downstairs). In the last two weeks this line has appeared where the new extension meets the old house and there is a ridge in the floor. A friend has said that the concrete floor has dropped and this will be a crack underneath. My question is how can this be rectified, whose fault is it and will it get worse if left? the karndean cost £3200 and was a installer from a showroom that stocks karndean. your thoughts would be much appreciated.
the new part is concrete, the old part was the existing house floor and it had carpet/floor tiles on. the old floor was slightly higher than the new but the floorer put down screed to level it off
Looks like the new concrete hasn't been stitched to the old and the floorlayer has just screeded over the transition without using any kind of crack repair
thank you for your advice. should the builder have done this or should it have been the floorer in your opinion?
Well the builder shouldn't have left a gap like that between the two and the floorlayer should have known better It's possible to rectify to a point but there's no guarantee it won't show through again with the gap being so wide
ok thanks, not really sure who to go to first as I am guessing both will pass the blame to each other. I wish the floorer could have warned us though and then maybe we wouldn't have had the whole downstairs karndean'd for £3k. Is there a typre of flooring tha would work with this gap then or does the concrete floor need to be relaid? thanks for your advice.
Hi, Can you remember if the new part had any insulation put in the floor before the subfloor was installed? Also, was the subfloor poured in or did the builder mix it up himself?
The floor did have insulation put in to it and it was poured. Also looking back at the pictures it does look like a big gap but the black you can see is the ‘plastic’ membrane sticking up. Thank you for all of your opinions
This is the floor after it was laid, the back of the house was then knocked out and this is where the line has appeared
