Just thought I'd better check before I hit secondsandco. The kingspan/celotex foam board to be used under the floor slab, as my solid floor is spec'd, so bearing the weight of 6" of concrete. Can the standard board be used for this - i.e. yellow fibrous, foil on both sides ? Or do you need a special stronger board for use under the slab ? (i.e. kingspan make some kind of "kooltherm K3 floorboard")
Thanks, Simon.
You can achieve the same results with 125mm of polystyrene, although it does require more depth (obviously) and ergo, more digging, but this is often not required if the area is already well excavated, it just means less MOT infill.
I know that. Not enough depth, related to drains and existing house founds, this is for an extension. 75mm depth available for insulation, must be a PUR/PIR board therefore. Simon.
On Fri, 25 Jul 2008 08:10:03 -0700 (PDT), a particular chimpanzee, sm_jamieson randomly hit the keyboard and produced:
Yes. Unless you're planning on putting a safe or industrial lathe on top.
If you think about it, 1m² x 150mm thick of concrete might weigh a lot (~360kg), but it's spread over an area of 1m²!
I know, I know. I just need peace of mind ;-) Thanks, Simon.
Wouldn't even that be OK though - ie spreading the extra load over the
6" slab?David
and
Yes, but you need rebar or mesh (or both)
AWEM
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