Unless it's actual damage that can be repaired, nothing. Movement will
just break any filler out between individual pieces, anyway if it's
along the length. At ends if there's a sizable gap you might be able to
make a patch but I'd not bother in general--it's a feature not a defect.
Wood swells in the summer heat and humidity. Contracts in the winter cold
and dry. If you fill the cracks, it may swell and buckle in the summer. The
correct action may be to leave the cracks till summer and see if they swell
Christopher A. Young
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I will be sanding and refinishing and old hardwood floor soon and I am
wondering what should be used to fill gaps between planks? I see an
occasional gap of perhaps 1/16 inch here and there.
Will dry and work out when you walk on the floor.
I've seen cord stuffed in the gaps.
Other than the rustic look can't say I care for it.
I'd say either leave them or pull the floor and re-lay it.
Sorry, I'm not a pro floor guy, just watched a lot of TOH.
Q: I am repairing hardwood floors in my home. I would like to fill the
gaps between the boards. Is there a product for this job?
— Trisha, West Chester, OH
A: Tom Silva replies: You can apply wood filler to fix the gaps, but
this can be a temporary fix. When the floor contracts, the filler can
pop out; or, when it expands, it can fall in, unable to span the wider
gap. In the Milton House, the gaps in the floorboards were so wide
that we filled the seams with rope and then stained it to match the
floor. This is an old technique that's quite smart; the rope expands
and contracts with the rest of the floor and the gaps stay plugged,
keeping drafts to a minimum. To properly fix your problem, you need to
determine why your floors are gapping.
I owned a house that had been flooded. The lower level floors had
some wide gaps. I tried every kind of putty and glue under the sun.
If the boards move, (and they do), rope or rebuild.
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