raising concrete floor 70mm

[dml]

Hi All

I'm looking to raise the level of a solid concrete utility floor by 75m to match adjacent Kitchen.
i intend to use a sharp sand and cement screed, then my floor layer will latex self level through both rooms prior to laying vinyl flooring.
the DPM is visible around the edge of the floor where it meets the wall my question is can i just screed on top of the existing concrete and to the walls or do i put another DPM on top of existing floor and up the walls?
or is there another suggested method of raising 75mm

Thanks in advance

 

[aveatry]

How old is the floor as I am thinking that there is no insulation in there so you can use PIR insulation to raise the floor by 50mm and maybe 25mm ply on top of that then you have done the job quicker and have an insulated floor to boot

 

[dml]

I'm guessing the utility extension is early 90's and no insulation, i haven't been in the house long and the other rooms appear to be a floating chipboard floor over PIR.
I wanted to avoid timber in the utility as blocked washing machine filters are a regular occurrence and with the best will in the world involve a fair amount of water on the floor!
However you are right it would be quicker and have the advantage of being insulated .
does the PIR lay straight on the concrete or a membrane in between?

 

[catlad]

Lot of things will stick pir insulation, expanding foam being the one I use a lot.
Sounds like you would need to finish it of with Vinyl.

 

[23vc]

Could use T&G ply rather than chipboard. Copes better with getting wet

 

[aveatry]

I wanted to avoid timber in the utility as blocked washing machine filters are a regular occurrence and with the best will in the world involve a fair amount of water on the floor!

If you seal the edge of your vinyl to wall then the water can not get under.
I have tiles and have sealed the perimeter and also under the unit next to the washing machine have siliconed a length of plastic conduit to the floor so that any leaks will show themselves out the front and not spend weeks doing damage out of sight.