Screw joist into parquet floor?

[Dannelind]

Hello

I am about to start building an interior wall, the floor consists of parquet flooring. Can I screw the floor joist directly into the parquet, or do I need to plug first? I personally think there shouldn't be any problem with screwing directly into the floor since it's a wooden floor, but I would like opinions on this.

Best regards, Danne

 

[Mäster]

The parquet is usually "floating" and should be able to move slightly depending on temperature/humidity. Screwing it firmly under a wall can be unwise, risking cracks and floor creaking.

 

[Dannelind]

how do you think I should do it then? I have to attach the sill to the wall, and it must be screwed to the floor.

thanks for the quick reply

 

[LAINE]

Can't see any other solution, or does the Master have an idea? If you want, you can remove the parquet that ends up under the floor joist and then choose an appropriate fastening to the subfloor.

 

[myrstack]

One way to maintain a partially floating construction is to use a hole saw through the parquet if you have an underlying floor that can support fastening the beam. If, for example, you have an underlying chipboard and your beam at the bottom of the interior wall is a horizontal 40x70, you can use a hole saw and a drill around 60-70 mm through the parquet every 40-50 cm. In the hockey puck-shaped holes, you then place hockey pucks that are ~10mm in diameter smaller than the hole you drilled and 2-3 mm higher than the parquet. Plywood or similar materials are usually good for making these. You screw these down into the underlying floor and then screw the beam to them.

To keep it floating, you must ensure the drywall does not rest directly on the parquet as it will press it down. The higher the ceiling and the more drywall/plywood/obs you use on the wall, the closer you must place your "hockey pucks."

Personally, I find the technique too cumbersome to use, but in certain special cases, it works. If you have a plunge saw, it's obviously easier to cut out a section for a beam, but if you have an old, nice parquet and there's a risk that the wall will later be removed, using the hole saw at least makes it possible to replace individual parquet strips if you place the holes smartly.

// Mats

 

[Dannelind]

damn this turned out to be hard, hasn't anyone done this before?
what's the worst that can happen if I screw directly into the floor? I understand that
the wooden floor is alive and can move, but how much? does it matter
that it's on the upper floor in our house? it's a 1½ story wooden villa.

Best regards Danne

 

[viktorj]

Buy a steel rail and lay it on the floor instead of wood, attach it with double-sided tape.. it stays firm as a rock.

 

[Mäster]

Thank you myrstack, I thought it felt complicated to explain,
No worries Dannelind, it's not that hard, do as myrstack suggested, drill a bit here and there with the hole saw,
If the parquet is 15 mm, take a 16-18 ?mm chipboard or something, and drill out plugs from it, which you then put in the holes in the parquet,
You can also use a jigsaw to make the plugs, if they're 10 mm smaller than the hole it doesn't matter
Put the sill in place and screw it on.
It's about 15 minutes of work,

Or you can just go for it, without doing anything and take a chance...

 

[JanneL]

If the wall is going to be there permanently, I think you should saw away the parquet under the sill. I personally have bad experience with placing walls on top of floors. I'm primarily thinking about sound between the rooms.