Floorboard lifting

[TJAY]

Hi,

We've recently had our place re-stumped, and then I repaired the old baltic boards. Clearly it was my first time as I've just noticed that a nail has lifted and a couple of the boards are flexing. Of course this is happening now the floor has been sanded, polished and sealed. I had used a nail gun and compressor to nail the boards, so I'm surprised to see one lift - what could cause that? The tongue and grooves were missing in bits, but everywhere else was also glued.

So I assume to fix it I can just nail the board back down again, and maybe carefully fill the hole and crack between the boards again with something like the Sixaflex pro stuff, and then with a fine brush reseal the patched area of the floor? They're 100 year old boards, so there's plenty of 'character' and they're far from perfect so I don't think you'll notice too much.

Any other tips? Any particular type of nail I should be using?

Cheers,
Ben

[glock40sw]

G'day.
Use a screw shank nail. It will give better holding power in pine.
also, try to skew nail. this will also add to the holding ability.

[echnidna]

or use longer nails into pine joists.

[les88]

what is the condition of the joist?

[TJAY]

They all seemed nice and solid, and unfortunately its too late to be able to get under there and check...

[UteMad]

The sika to use isn't pro its Sika 290DC specially designed for joints in t&g boards on marine applications... I have back taped and done up to 13mm wide .... It is a messy and times taking job cause you have to tape both sides clean the joint out vacuume it you should use there primer (clear) then shoot it in trowel off just once rip off tape and trim to flush 72hrs later....

cheers Utemad

[TJAY]

Thanks for the help, part one was done over the weekend, ended up nailing quite a few of the boards, but they feel a hell of a lot more stable, no where near as much flex as before. Sunk the nail heads so all I have to do now is fill them and carefully paint a bit of poly over them.

The floors are all Japan blacked (pain in the bum to keep clean, but everyone keeps commenting on them, they've like black mirrored glass) - to fill the nail holes can I just use the sika stuff, or something like Timbermate?

[Larry McCully]

Thanks for the help, part one was done over the weekend, ended up nailing quite a few of the boards, but they feel a hell of a lot more stable, no where near as much flex as before. Sunk the nail heads so all I have to do now is fill them and carefully paint a bit of poly over them.

The floors are all Japan blacked (pain in the bum to keep clean, but everyone keeps commenting on them, they've like black mirrored glass) - to fill the nail holes can I just use the sika stuff, or something like Timbermate?

Timbermate is the go for the holes