Newly laid engineered wood glue-down and HOLLOW Sound???

jojogirl11January 1, 2010

We just had 800SF of Mohawk's Santa Barbara engineered hand-scraped wood floor installed. I noticed today that some of it sounds hollow when knocked on. We used Bostik's Best, used the trowel they recommended, etc. What does this mean??? Very alarmed.

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A few things here:

1. Your substrate may not have been flat to within manufacturer requirements.

2. Bostik's Best does not hold trowel ridges as well as some other brands.

3. Even the best professionals can produce engineered wood floors that have a few hollow spots...that is why a repair kit is made to fix problem areas. Bostik makes one; the added adhesive to fill the hollow areas is injected through a small hole drilled into the flooring.

    Bookmark   January 1, 2010 at 10:26PM
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I presume it was installed over a concrete substrate. If so , minor dips to the subfloor can give it a hollow sound in spots. have no worries, it should be fine.

    Bookmark   January 2, 2010 at 1:25PM
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Oh wow, I really do hope that is the case, echoflooring! How does one determine if the hollow sound is due to dips, or if it is due to adhesion problems?

glennsfc, our substrate was flat to within the manufacturer requirements. The installers used a laser, and leveled areas with the appropriate concrete filler.

If we were to use the injection technique to fill, where do we stop? There are seemingly hollow spots in MANY areas, not just one or two. There are so many spots - I'm guessing 30 or more.... thoughts?

    Bookmark   January 2, 2010 at 4:59PM
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Well...echoflooring is right in saying "it should be fine." If you can live with the floor as it is, then maybe that is what you should do. If you can't ignore the occasional hollow sound, then you've got a problem there. Doubtful that the floor is going to do anything to cause any issue other than these hollow sounding spots.

    Bookmark   January 2, 2010 at 5:29PM
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I called a flooring store, they gave me an estimate of $1200 to inject the hollow spots in the floor with 3m epoxy shots. There are 700SF total. Thoughts on this?

    Bookmark   January 15, 2010 at 12:47PM
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That is your call? I would be anxious to hear if it remedied the problem. 30 spots over 800 sq ft. Thats a lot. It is difficult to know what went on their without examining. There are so many variable that could have caused some of this.

    Bookmark   January 15, 2010 at 3:03PM
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The open time on the glue could have been too long causing it to skin over before the flooring was laid.
Anyway you look at it the installer is responsible not you.

PS: Glen knows what he is saying!

    Bookmark   January 19, 2010 at 6:55PM
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There will always be hollow spots here and there with gluedown floors. It's the real problem areas that make noises that can be fixed with a glue injection kit. The video below does a pretty good job of explaining the method.

Here is a link that might be useful: DriTac Repair Kit

    Bookmark   March 12, 2011 at 8:54AM
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Thank you for sharing your problem with a glue down floor over concrete. I had thought only hollowness came from floating a floor over concrete. I leveled the floor myself before the installer came so before my water damage, my floated engineered wood floor felt like a solid floor. I hope the installers fix the problem since they should have told you that they needed to level the floor. Please keep us updated.

    Bookmark   May 21, 2013 at 11:22PM
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