DIY Doctor UK DIY Forums

Hello all,
need some advice about best and cheapest gap filler between old floorboards that are to be sanded down.
I have four large rooms to do and dont want to spend a fortune on resin or the gapseal products that are about. I have started fixing and replacing loose boards and have kept the sawdust . Just wondering what is best to mix it with . Is pva the best? my concern is that its too "rubbery" to sand down once gaps have been plugged.
Did this ages ago with another proerty but cant remember what I used.
any help much appreciated , thanks
simon

I've tried using sawdust mixed with stuff and its a PITA. As a random suggestion, if you can get underneath, use expanding foam along the cracks, chop off all the excess from top and bottom and fill in the top bit with coloured filler.

Or use silicone, but that can be fraught because it tends not to stick because of the existing dust and rubbish on the board edges.

Or, I understand you can get insulating bubble wrap stuff to stick to the joists that negate the need to fill in the gaps (from a draught perspective)

See our projects section - Filling gaps in floorboards.