under floorboard insulation

[mikegc]

Hi,

I am fitting our new kitchen, and have had to take up most of the floorboards because a previous builder filled it up with rubble from taking out a chimney, so I have been clearing that out!

I was thinking of insulating under the floor whilst I am at it, and wondering whether to use solid boards like celotex, or netting and natural wool insulation? I think the boards will be easier, and more widely available without having to wait & pay for delivery.

Any thoughts/suggestions?

Thanks!

 

[TheVictorian]

I've just done mine with netting and rockwool type insulation, worked out far cheaper than using celotex and easier too as you don't have to cut it as accurately as you would with celotex.

Is there a specific reason for using sheeps wool?

 

[mikegc]

I like the idea of sheepswool because its natural, good with moisture and isn't hazardous.

 

[mikegc]

If I go with using boards, should I use regular polystyrene sheets because it is more breathable? I'm thinking of 50mm thickness. The floor will be tiled over in places, then rest will be exposed beneath kitchen units.

Can the insulation go right up to the walls, or should there be another type of barrier or small gap?

 

[mointainwalker]

Unless you are a physicist in a lab measuring tiny differences, polystyrene isn't more breathable.

 

[mikegc]

This was what was under the floorboards! Not much room for air flow!

Untitled

• mikegc
• 3 Jan 2013
• 1

Untitled

• mikegc
• 3 Jan 2013
• 1

Looks like they cemented over a load of it aswell, not sure what to do with it.