DIY conundrum, sealing gaps with a void underneath

[demonloop]

I need to seal some gaps in floorboards, that have a void underneath

The gaps are about 5-7mm and the boards are painted white, I don't want to repaint

Is there anything on the market beyond white filler/sealer, which will just fall through the gaps, or expanding foam, which is messy and isn't white?

[jwg663]

This appears to be white. Whether it's white enough, I don't know:

https://www.amazon.co.uk/UniBond-207.../dp/B074KPZLXY

[JasonM]

Any help?

https://www.celticfloorco.co.uk/wood-floor-gap-filling/

[reecie]

Something like this? https://www.amazon.co.uk/gp/product/B006PFYMLM/ in whatever diameter you need

[Suds]

I did my floorboards with wooden fillets which will then require trimming/sanding to level with the floor. Fillets obs wont match the floor until you repaint.


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[demonloop]

Thanks all - one of the links has led to more info and a product called draughtex which appears perfect. I can even install a few mm below the surface so no remedial work required