On Sun, 16 Apr 2006 09:27:02 +0100, Mike Halmarack ... wrote:

On Sun, 16 Apr 2006 08:14:00 GMT, Rick wrote:

On Sun, 16 Apr 2006 06:51:56 GMT, bendit wrote:

I have an old 60 year old house that has a raised timber ground floor
above a concrete floor. The void is aprox 3 ft.

Traditionally you would fill this with hardcore and then a layer of
concrete, to form a new floor.

But my wife insisted on getting laminate flooring ontop of the T&G and
beams, and I do not want to lift that.

Is there any other way of insulating the floor void. I have thought
about injecting cavity wall insulation.

Any ideas or suggestions that the regulations people would accept ???

I went under mine and used 1 of 2 techniques

1) rockwall held in place with plastic mesh - horrid job to do

That's what's deterring me. Maybe measure up and put the rockwool into
polythene tubes, then seal the ends before fitting. That would reduce
most of the unpleasant effects.

2) polysyerine cut and wedged in.

Lot's of potential for ill fitting and pipework obstructions here.

I would use kingspan if I did it again.

Looks good, haven't made a price comparison.
Rick

Kingspan / polystyering have similar mechanical properties. Kingspan
insulates twice as well per mm of thickness, so you use half as much
or get it twice as good. B&Q prices were 50mm thick 17.05 100mm 32.54
for an 8x4 sheet inc VAT, these were competative when I last checked.

You can use sprayfaom to fill in any gaps you leave.

The rockwall solution is massivly unplesant, not only to fit, but to
do any work on pipes/wires in the future. Rockwayy themselves do some
floor insulation slabs which expand to tightly fit beween joists, I
have not used these yet, but they may work out well for you.

Rick