On 10/11/2013 19:36, John Rumm wrote:
On 10/11/2013 18:58, dennis@home wrote:

I wouldn't put timber on top of polystyrene, the fire risk and toxic gas
would make it bad.

Proper PIR foam is fire retardant[1], and insulates better anyway.

[1] as is jablite etc to be fair.


Jabalite and PIR foam burn and produce toxic gases if there is another
fuel providing heat, as in a wooden floor.