LVP flooring on screed and wood.

We have just had am extension built which is a knock through into the original house.

The new part is screed and the old part is the original floorboards.

The builders suggest Amtico click with a fibreboard underlay, adding skirting over the top.

Floor company insists it needs plywood all over and stick down boards, as it has big glass doors, so lots of sunlight. Plus it's a kitchen already installed. That click will come up and be a mess in a few years

Another said it needed a levelling compound and again stick down boards.

Total area is 65m2.

Is there a right or wrong answer to this?

Thanks

 

The answer is you need a specialist to look at the floor to determine what preparation is needed. What I can tell you from here is clic on fibre board and sunlight is a massive no no and will probably last 4/8 weeks max


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Just prep'd and screeded one today exactly same as yours.
6mm plyboarded the floorboards overlapped 100mm onto the concrete and fibre flex screed the whole lot.

Was 58m2 but managed to use 21 bags by the time we levelled it out.

 

What flex screed you using mate


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1st of all you can’t lay click on fibre boards. It will fail 100%
Also click and sunlight is a big no no.
As rug has done. The correct way.

 

And how long has the concrete been down? Did the screeders grind off the laitence? Has anyone done a Rh% test because I would expect to need to surface dpm before even looking at it.


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Yeah defo the best way IMO


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Renovation pal

 

Yeah was just going to say that. Both subfloors should be moisture tested before any floor prep is done


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Thanks, I have had flooring stores come out. Two have said the floor needs 9mm ply all over and one has said half ply and half the levelling screed, then the builder said just the underlay. So I was left a little confused.

For the stick down they told me to make sure all the skirting is already in place rather than placing it over it, I assume that is because it doesn't need the 5mm expansion unlike click. Is it a problem is the skirting goes on after?

The screed went down in January, a test was done and one part which was covered was not fully dry, so I have uncovered it.


The builder has been brilliant, but looks like I need someone with more flooring expertise.

 

I’m not sure about 9mm ply over screed but 6mm isn’t always enough to hide the subfloor. That’s why it’s better to use a flexi screed over the whole lot after. You can put the skirting on after the stick down floor but you will often get a shadow gap (or worse depending how flat your floor is) if the skirting goes on first the floor can be fitted right up to the skirting with no gap


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Thank you. So at what point should the skirting go down? Should it happen after the floor is prepared with the process you suggest?

 

One other thing I wanted to mention was that when the glass sliding doors were put in they were meant to leave a threshold of 25mn but instead it's about 10mm.

I have been told that some of the products I liked, such as wood look laminate are not viable as they will take it above the height of the threshold.

Is that the case? Would there be a solution to this? Basically I have dogs and kids so wanted something robust.

Thanks

 

Have your skirts put on, get it prep'd then the lvt stuck down. As merit has said, sometimes you can be left with a shadow gap when skirts are placed ontop last thing but with them being on before the prep is done then the screed can be flowed up to them....obviously with care taken not to redecorate your skirts with screed!!

The builder might have been great so far but you are right about getting a specialist in to take over the floor side of things.

With the threshold being 10mm then providing there isn't a huge deep full requirement over the whole floor then you can more or less have that near flush of you wanted to but has to be done properly.

 

*if you

 

...oh and yes it's looking like you'll have to go with lvt to keep it withing that 10mm allowance

 

This is the one we did yesterday, we took out his 12mm laminate and underlay which left big gaps under the skirts due to the skirts being fitting ontop of the laminate and also the kitchen island ontop (a big no) so had to flood the lot with mapei renovation screed.

the top right corner was the old house (floorboards) and came out to that pillar which then floorboards ran all the way across.

We also did the hallway which was timber aswell so screeded from front door all way through to his bifolds.

Popping in today to see if we need to put another level on it to close most of the gaps especially his end panels/island so all in all the floor has been raised around 15mm so far.

 

We did go to take the chrome legs out but after starting to hear 'creaks' we advised customer that its best we leave them in.

Will be having Art select spring oak parquet next week

 

Thank you. You have also reminded me that the end panels and bottom rims to the kitchen units have also not been put on as the builder said to put those on after the floor.

So along with the skirting, should everything be done?

 

The concrete was put in January it’s not even close to dry you will need a surface dpm it’s barely ready for a test it’s that fresh.


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