Is there an "accepted way" of dealing with gaps between floorboards

[d000hg]

(other than carpets obviously)

My office has a Victorian painted floor which we sanded back and varnished. The planks are beautiful but have quite a lot of gaps; we just dropped the ceiling into the cellar underneath to prepare for a conversion and it's amazing how many places you can now see light between the boards!

We will be putting a new ceiling undereath with insulation but I just don't like the idea of all those cracks... draughts, dust, noise, etc. Also we need to spray under the floor with anti-rot treatment so I'd rather it didn't flood my office - and when they start stripping the walls the amount of dust that would come up through the gaps will be crazy.

Is there a way that is commonly used to deal with this... the "right way" everyone uses? Or do I need to consider multiple ideas?

I had been wondering about getting brown/black bathroom sealant for an 'invisible' filler - this would be easier with the ceiling down so I can access from both sides. I can't decide if this is a smart idea or a terrible one!

 

[buildersbutt]

Hi, had a similar problem in bedroom gaps between boards, pumped Gripfill straight from the gun, problem solved!!

 

[d000hg]

Thanks, glad to know someone else had a similar idea.

 

[endecotp]

If you want you can buy slivers of wood to push into the gaps and then plane down.

 

[d000hg]

A pain after already varnishing but I guess so. Plus the added fuss of colour-matching them