insulation under kitchen flooring

Hi,

I currently have a tiled kitchen floor, which is on a suspended cement floor. The floor itself is quite cold to the touch and the room is quite cold as a result and I'd like to improve that.

Ideally I'd get under the floor and insulate from beneath but that isn't an option as there is no access. I don't really want to go to the expense of underfloor heating as it is quite a big area (4.2 x 4.2m). After taking the tiles up I think I will have about 30mm clearance.

So my plan is to have 10mm of insulation board and 18mm of floating engineered flooring. What I want to know is which insulation will give me the best level of insulation, but none of the insulation boards seem to have u values.

Which would give me best insulation:

http://www.screwfix.com/p/klima-polystyrene-insulation-boards-pack-of-8/75113

or

http://www.screwfix.com/p/klima-thermal-board-insulation-pack-of-8/92431

or

something else or even I could try to get 20mm of kingspan underneath go for some thinner flooring and try to get away with a minimal (5mm?) step up.

Any thoughts / ideas suggestions or previous experiences are welcome!

Thanks,
Dan

danped said:

Hi,

I currently have a tiled kitchen floor, which is on a suspended cement floor.

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Is is a suspended 'cement' floor? With no insulation already under it?
How old is the property?

Boarding on top of thin insulation board is prone to movement.

built in 1989, what kind of movement is it prone to?

danped said:

built in 1989, what kind of movement is it prone to?

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There have been some other threads on this forum regarding this type of construction.
It seems that over time the insulation might compress unevenly, causing the boards to squeak when walked on.

ok thanks i searched but couldnt find any threads on this is thyere another name for ce;otex or kingspan to use?

danped said:

ok thanks i searched but couldnt find any threads on this is thyere another name for ce;otex or kingspan to use?

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Sorry, I can't remember what the thread was called, but it centered on the disadvantages of this type of construction - could have been about a year ago so lost in the mists.

I'd wear socks

danped said:

ok thanks i searched but couldnt find any threads on this is thyere another name for ce;otex or kingspan to use?

Click to expand...

Quintherm...

You're so helpful, Ronny