Subfloor adhesive question

[vrinner]

Im putting 1 1/8" T&G over my steal joists. Joists are placed every 2 foot. Im securing the subfloor using Simpson stronge tie TB1475s screws specifically for wood to steel. Plus Im leaving 1/16" gap between each sheet (I saw that recomendation elseware). Total size is 800sf.

Question is should I use any sort of glue beteen the joist and flooring to prevent squeeking? Im not sure if necessary when its wood to metal or any special type of adhesive is available for that.

 

[jkeyser14]

Yes, use construction adhesive or subfloor adhesive.

 

[scottydosnntkno]

I believe the only subfloor adhesive certified for wood to steel is the advantec foam adhesive. We don’t use steel joists around here so it’s not common for us.

Depending on what you find, you could possibly even use plain old silicone in your case. Being steel, the joists arent going to move or flex like wood ones do. Silicone sticks to everything. So your screws are the strong mechanical connection, and the silicone is the forever slightly pliable, cushion if you will that buffers and prevents any squeaking.

 

[DFB]

Specs on Locktite PL400 says it can be used for wood to metal contact its the only one local our lumberyard stocks

I just used it on exterior cinderblock wall to set a door frame along with few tapcons so I have a tube right here

 

[mike93lx]

Absolutely use adhesive.

Check that panel gap. Advantech says 1/8 IIRC

 

[vrinner]

Absolutely use adhesive.

Check that panel gap. Advantech says 1/8 IIRC

I found this on the APA website. The shape of my T&G looks like the one on the right for 1/16 inch.

 

[mike93lx]

I found this on the APA website. The shape of my T&G looks like the one on the right for 1/16 inch.

 

[scottydosnntkno]

Don’t stress too much over the gap. You’ll drive yourself crazy.

The boards aren’t always cut 100% square. So you first few sheets might line up, but ten-fifteen sheets and 60’ over you may be banging on them to even get to 1/4” - 3/8” gap. Especially when gluing, yeah the TG adds some strength, but your also talking 1-1/8” thick boards glued down. There’s not going to be much flex in that floor. Plus your finish (tile and backer or hardwood) adds an additional level of ridgitity

 

[Toolfool]

SIKA-flex.