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Glue-Assist Nail Down really necessary for wide plank?

1289 Views 1 Reply 2 Participants Last post by  carpdad
Hello all. I'm replacing carpet with wood flooring on 2nd floor of home, and have questions about the recommended install method and underlayment.

I'll be installing 3/8" x 5" pre-finished hickory engineered wood. The manufacturers instructions that came with wood say to install by glue-assisted nail down for 5" wide or larger planks (running bead of glue perpendicular to floor direction every 12" oc).

I had planned on using an underlayment like Quietwalk Plus or Eco Ultra Quiet Premium under the hardwood to try to reduce impact noises being heard on 1st floor. With the glue-assist method I have to eliminate the underlayment and attach wood directly to subfloor though.

My question then is it really necessary to use glue for 5" wide planks? Or will the flooring still be okay if I eliminate the glue and just nail down over the sound dampening underlayment?

Subfloor is planks at 45 deg angle with 3/4" plywood underlayment on top. It's all structurally sound and flat.
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This is a question for a pro who installed many floors. But pros usually would tell you to follow the manual. My guess would be the glue is used because thin flooring has more chance of cupping. As such, if it was my floor and suspecting that the panels have higher chance of cupping, I would over engineer and go to 6" spacing for glue, or trowel and glue the entire surface. This is because manual spacing may also contain the manufacturer's worry that some people may not buy the flooring if more gluing (therefore more annoying) is recommended. Doing things this way, also voids the warranty. This is long time ago. I used bruce 5/8" thick and about that wide edge glue floating floor. Finish layer nearly 1/8 thick. Over time, I could see that the flooring was not absolutely flat. This wasn't from feel. Just how the light reflected off the surfaces. The panels were plywood, not mdf layer. I also thought maybe they were slightly cupped from the beginning.

Not sure if glue would solve that problem. But that is also my amateur's opinion. Not using such foam layer, I don't think you'd lose much sound insulation. The panels are tightly nailed anyway. Only sensible recommendation I saw was using actual thick rubber sound sheet and I think it was a floating floor.
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