Installing the underfloor heating has neared the top of the jobs list.
Despite much reading of suppliers PDFs and head scratching there are
still areas of uncertainty:-)
Current thinking for the screeded area is to use self adhesive clip
rails over the Celotex foam. Spacing between rows seem to vary from
750mm to 2.0m depending on source.
Question for the chemists... what is the surface coating on the
aluminium foil? Cleans off readily with acetone and accepts the supplied
tape readily but *duct tape* needs it cleaned off first.
Floor heating suppliers provide a thin foam perimeter sheet to provide
expansion space for the screed but Celotex show an upstand of PIR foam
to insulate perimeter walls. Do I use both?
There may be more to follow...
Yes. Travis Perkins hire out the tool at ?21/week. The recommended
Celotex has a multilayer surface to provide a more reliable fixing. My
supplier could not promise a reasonable delivery as PIR insulation
deliveries from Celotex have suddenly become unreliable. I'll probably
go with clip rails at 1m and shove in some intermediate clips and at the
Not very! Light finger tip pressure would flatten it.
OK. Double up for the perimeter walls and foam only for the partitions.
My longest run is 8m which is the threshold for expansion joints
although I could hide one at a doorway.
Why are ytou using celotxe fore floor insulation? Unless its first
floor, everyone else uses polystyrene...
Dont knock yourself out about how to locate the pipes. Anything that
will stand presurising and then screeding or concrete floating will do.
Meat skewers and tie wraps os probably good enough.
On the new builds here they simply pushed plastic staples in by hand.
Edge expansion is unimporatnt, as long as there is one.
“It is hard to imagine a more stupid decision or more dangerous way of
making decisions than by putting those decisions in the hands of people
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