Raise floor by 32mm

iansl2000

Hello,
I'd like to raise the floor in my conservatory by 32mm so that it matches the level of adjoining floors and clears a couple of obstacles.
I am planning to use 25mm thick polystyrene toped with 6mm underlay boards and a laminate or wood veneer floor on top.
The polystyrene is here
http://www.wickes.co.uk/Polystyrene-Sheet/invt/210801
Do you think that this will stand up to the weight of walking on the floor or do I need something more substancial than polystyrene?

Thanks
Ian

andyhop

Think that floor will compress too easily

I would recommend a self levelling compound, Some can go to 50mm in one hit, Wont be very cheap due to the depth required

ormus

youll probably be better off with high density floor insulation.
comes in 25/30mm thick slabs. laminate on top and job done.

wallbash

Also worried about compression.
Very worried about cost/aggravation with self levelling

Whats the make-up of the conservatory floor at the present time.

iansl2000

Thanks for the help.
The floor is a concrete slab with thin underlay and a cheap laminate at present.
Any idea where I can get a high density base material? I'm in Kent

Thanks again
Ian

27col

When I raised the floor level of my garage conversion I used Jablite which is directly under the floor boards. Only problem that I can see is that you do not need as thick a layer of insulation. The stuff that I used was 50mm. Google Jablite and see what comes up. They may do a thinner one.

iamcornholio

Jablite, Styrofoam or Celotex/Kingspan are denser than polystyrene

But the probelm with the OP's proposal is that there will only be 6mm of boarding on top of the insulation, and so there is a significant risk of compression and indentation of point loads (from furniture) or frequent use areas (walkways) whatever insualtion is used

A minimum of 9.5mm of ply or mdf or similar should go on top of the insualtion to spread loads before the floor covering is laid