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tlawless
Noisy floors
tlawless

Dear Sirs,
I purchased a new house a couple of years ago and have been experiencing the boards (plywood) under the carpeting squeaking or sometimes even banging when you walk over them. This happens only in certain areas. I was advised by a carpenter to purchase GRK FIN/TRIM 2.5" screws and screw right threw the carpeting into the studs below. It has taken some of the noise away but much of it still exist. It's very frustrating to purchase something new and have this type of problem. What will people think when I try to sell some day? When I look at the plywood under the first floor that is accessable from the basement, you can see they glued and nailed, but many of the nails missed the joist.

davis
Re: Noisy floors
davis

If the floor joist have flex it will allow the flooring to rub and
and make noise. I have created a support system that will simulate a beam through the center of the floor. This tends to stiffen the floor and stop flexing of the floor joists and eliminates some of the noises. If you think it is the floor joists flexing this may be able to help.
davis

canuk
Re: Noisy floors
canuk
Quote:

When I look at the plywood under the first floor that is accessible from the basement, you can see they glued and nailed, but many of the nails missed the joist.

All floors will flex it's natural for them to do this....If there is too much it's commonly referred as "bounce".... the main thing is if the entire floor is flexing as one unit or as random (undesirable) sections .

The natural flex of the floor components can create problems with the nails loosening over time. That's why the sub floor sheets should be fastened with screws instead of nails. The common sound usually heard is creaking as the wood rubs along the loose nail and in cases wood rubbing on wood.

The fact you can see nails that missed the joists indicate a poor job of fastening the floor. If they were supposed to have secured the flooring every 6-8 inches then it isn't the case with the nails that missed the joists ... this would cause the flooring to be loose at those spots with perhaps even gaps that when stepped on would cause the banging sound you mention.
Another cause of gaps is from whether they laid the joists with the crown of the lumber down instead of up.

Seeing evidence there appears to be adhesive used doesn't mean that was properly done as well. The flooring should have been laid within a certain period of time after the adhesive has been laid .... too long and the adhesive will skin over and won't adhere properly ... this will also be affected by the climate of the day.

It sounds like the only way to eliminate the noisy flooring is to use screws along every joist. Either by lifting the carpet and under pad then screwing the sub floor to each joist .... or ..... the kit you can purchase where the screws are applied through the carpet and the head is then broken off.... but you have to make sure the screws go into the joists below.

Hope this helps.:)

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