Subfloor air sealing
I am currently building a small affordable multifamily building in Boston. It’s a slab on grade 4-floor building with standard wood frame. We are getting close to installing the subfloor sheathing for the second floor. We picked GP DryPly -a tongue and groove plywood with a coating that makes it (supposedly) more water resistant during construction. Probably not as good as Advantech sheathing, but big price difference. Currently Advantech is $70/sheet in my area. With some discount I was able to purchase DryPly for $40/sheet. I decided to take a chance.
We need to do air sealing between the floors. Doing a quick online search on the web and on this site I couldn’t find much info on this topic. I am considering taping the joints with 3M 8067 tape (Found some online for $25 for a 75′ roll). I’ve used some of that tape on various material in the past. When properly applied (dry and clean substrate + lots of pressure on the roller) it’s tenacious.
If anyone has some experience to share with air sealing a tongue and groove subfloor, I would welcome the advice. Thanks
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