Raising kitchen floor by a few centimetres...

I'm finding myself intrigued by Kingspan K3 as recommended by jeds. Seems expensive, at first, but when you realise you'll not need that many boards for this small space...

Hmmm.

One site taught me a new word... "autohesively".

They seem proud that "The board has a compressive strength that typically exceeds 150 kPa at 10% compression and 125 kPa at 5% compression" but I don't really know what that means... I weigh 100kg, is that going to be OK?

Anyone that can use the word deleterious has my attention - it's a "Non–deleterious material".
 
Just need to find out where I can get them in small quantities and without a huge delivery charge. Many places I've seen seem to want you to order 10. I have like 2.5m x 3.5m to raise.
 
Apologies for the follow-up... obviously (is it obvious? I hope so) this is a kitchen floor that I'm raising... can I put a kitchen on this? I have no idea how much a kitchen weighs... a fair bit, more than me, I expect.
 
CambridgeBrummie said:
Typical domestic loading is around 1.5kPa
Click to expand...
1.5kPa is equivalent to 1.5kN/sq.m, which is roughly 150kg/sq.m. Most kitchen units (even full with usual domestic plates etc) will not exceed this. A typical 600mm x 600mm unit is unlikely to weigh more than 55kg. The only possible problem would be if you were installing an AGA or similar which tend to be quite heavy.
 
The Wickes stuff is the same. These sheets with 22mm t&g chipboard floating on top is more than adequate to take all standard loads. As above a large AGA might need to be calculated but everything else is fine. The chipboard should not be fixed. Just lay it on top with glued joints. When done you may get an odd squeak or two but this will quickly settle down. People sometimes think laying floorboards on foam will be spongy but it won't. It will feel very solid.
 
Underfloor insulation is good, BUT you did say "a few centimetres", so you have 25 for the foam plus 18/22mm for the chipboard. . .So that's 43/47mm, a bit more then a few?
Frank
 
Hi, I got my tools out today (spirit level and ruler) and it's 45mm to 52mm at different spots (the difference) so I think this approach is really good.

The 25mm insulation is about £22 from Wickes.

The 22mm tongue and groove chipboard is about £14 from B&Q.

Couldn't find the other at the other stores, if you know what I mean... also fit some Gyproc joint cement (not for this) for £15, out of date... December 2015... happy days.
 
So it sounds like self levelling compound to get the floor flat and up to level. Then your foam then the chipboard with glued joints. Make the chipboard a few mm smaller so its not tight to the walls. As it acclimates to your kitchen it might take up water and expand. Hope it does not creak too much.
Frank
 
The floor to be raised appears to be flat and level, according to the spirit level... it's the floor already at the right height that may not be perfect.
 

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