What does ‘injecting the floor’ mean?

James1979 · 20 Feb 2021

Hi - I recently posted (https://www.diynot.com/diy/threads/hollow-sound-on-newly-laid-parquet.562191/) about a couple of hollow sounding areas in a newly laid parquet floor.

I’ve since called the floorer who laid it and he said it sounds like the boards have either lifted a little or the adhesive wasn’t thick enough in those places. He said it can be fixed by ‘injecting the floor’ at the hollow spots.

I haven’t asked him to do this yet as I can’t imagine how this can be done without obvious holes being left on the floor? I’m guessing he’s actually going to drill small holes then inject some adhesive or epoxy into the holes to fill the hollow.

is that what he means and does it look as bad as it sounds?!

KenGMac · 20 Feb 2021

James1979, good evening.

You need more info from the installer as to what method he intends to use?

Having said that, My son trained as a "Luthier" and from time to time when undertaking repairs to the neck of an instrument, he would use a Syringe with a fine needle to inject an appropriate glue into the deepest recesses of a small crack, at times yes a thin drill was used, so the process is [shall I call it] unusual but in appropriate areas can work.

I was on a project some [considerable] time ago, for whatever reason areas of small rooms had their sand / cement screed lifting, a "specialist" bored holes into the screed and used glass bottles turned upside down so the open mouth of the bottle was over the drilled holes and allowed the glue to run into the gap between the [in this case] screed and the concrete floor, it was 99% successfull?

Ken.

Swwils · 20 Feb 2021

90% sure they will drill a hole in the closest joint and inject with "fix a floor".

Fix a floor is a great product when used properly, hole should be as large as possible for the size of the joint. You can use a syringe down to 2-3mm without much fuss.

James1979 · 20 Feb 2021

Great - thanks for reply. Guessing they would fill small hole afterwards with bit of dowel or something and it would be nearly invisible? Will they always need to drill two holes for each area so the air can escape or is that not an issue?

thanks again - feel reassured!

James1979 · 20 Feb 2021

Apologies Ken - I didn’t see your reply also. Thanks for that - sounds like it literally will be an injection but will ask him to confirm process before agreeing.

Swwils · 20 Feb 2021

Might not even need a dowel.

Yes you should see it come up out of the other holes which confirms the void is filled, if it doesn't you drill another and continue untill it does.

James1979 · 21 Feb 2021

So the floorer emailed back and said that’s exactly what he means but he prefers to use low-expanding foam (exact gap) instead of fix-a-floor as it fills bigger gaps easier.

im guessing that’s ok? So have booked him in to repair

Swwils · 23 Feb 2021

Hopefully shouldn't be that big of gaps, but its basically the same material - slightly different application method.

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What does ‘injecting the floor’ mean?

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