I'm going to renovate an old pine floor ie sand & varnish the boards etc. but
there are gaps between the boards. I don't want to lift and relay the boards
so I plan to fill the gaps (various 3-5mm) I was thinking of pine
strips glued in and levelled off but I've heard rumours of cord or rope being
inserted into gaps.
I did this, but it is very tedious. I used natural type hemp and cotton
twizzled together several strands to make packing that would fit the gaps,
then banged them in with a wide-bladed bolster chisel. The difficulty is in
getting the packing to fit the varying width gaps between floorboards. I
necessary to add extra twine in or snip it out of the twizzled packing as I
along to get a snug fit ( didn't want it dropping through ).
I finished off with a natural wood colour acrylic frame sealant, of
gun variety, made by Dow Corning. I've seen pine strips suggested before,
even heard of successful jobs done that way, but I would not attempt it
use of a bench-mounted circular saw and probably an electric plane too.
The other method is mixing up sawdust with pva, and using that to
fill the gaps,
though my experiments showed shrinkage problems. In hindsight, I would only
gaps in floorboards where there was a draught from below ( i.e. suspended
wooden floors on the ground floor, as was the case with my job ). If it was
bedroom floor or elsewhere upstairs I think leaving the gaps would be an OK
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