Fill the gaps with foam.
As you will have found, it's not possible to fit exactly, you can waste a
lot of time trying.
Important every tiny gap is filled or the wholejob is a waste of time
It's best to cut the foam undersize and supprt with a few temporary nails
into the joists
If you have any bits left over cover the wall immediately below the
This reduces heat from tracking round your floor insulation through the
OK, thanks. Thing is, with foam, I've found it hard to get a neat bead
of say 1cm. Unless it's fed very quickly along the gap, I've tended to
end up with huge wodges of the stuff where it's not needed, that's then
a mess to clear up, and a waste.
I take it a gun helps with this? And just any old generic foam:
Yes, it's an entirely different experience using a gun. so mcuh more
I've got that one I think - or very similar, came from screwfix or
Using the black knob you can adjust it down to give a slow flow of foam,
for a narrow bead of a few mm, or open it up for a big squirt. And the
trigger is also much more controllable.
When you stop, just screw down the black knob and wipe the end. It is
then fine to use again the next time. Squirt through some cleaner when
you change the can
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