Hi All,

I'm putting down a 1/2" plywood underlayment atop my OSB subfloor.

Glueing and screwing because I hate squeaky floors and am willing to go to great lengths to help avoid them... Small bead of PL-400 around the edge and good hearty squeezes of yellow wood glue in the middle.

I've read for *nailing* the underlayment to do one nail every foot in the interior of the plywood and around the perimeter at 2".

I've done a few 4x8 planks with screws at that frequency... man that's a LOT of screws. The floor looks like the skin of an airplane with so many screws around the perimeter.

Am I on the right track? Seems like a lot of screws...

thanks,

Bob

Too many screws around the perimeter, especially if you're gluing as well. With 1/2" ply, screws and glue, you could go 6" around the perimeter. But go to an 8" grid in the middle.

Cool - Thanks Gary. I backed off as you suggested and it looks pretty good. I'm putting 3" screws into the joists then filling the rest with this neat little Hilti screw gun I got off ebay. 2000 screws and counting....

I also found out why the old construction squeaked so much - many of the nails completely missed the joists. There were sections where the line of nails was an inch or two away from where the joist actually was. The floors are MUCH quieter when actually secured to the joists.

Are you using yellow wood glue in the middle? Like the gallon sized stuff?
I can see using liquid nails of some sort, but not plain old carpenters glue. But then again looks like a ton of screws

Yeah, maybe literally a ton of screws! I read (on here I think) that the yellow glue was fine but I'm no expert. I like the PL400 but we're living in the house at the moment and the more aggressive the glue, the stinkier it is, and the more brain cells start to die...

I thought about gluing a temp panel down and pulling it up a day or so later to see if the glue did anything.

Part of the floor has felt paper between the underlayment and the subfloor. I'm trying to make the underlayment as level as possible so when I get to the floor it's already pretty close - as a result I don't glue those parts because I figure I'd just be gluing the plywood to the top layer of felt.

Yellow wood glue is what I use for this. It's made for laminating wood together. I can't use any glue underneath a tile job though... the idea there is so the subfloor can move a little without affecting the top underlayment layer.

yeah I use it to make round peices and inlays ect, glueing each peice to the next. Just nevere thought of using it for plywood, maybe apply it with a roller? or just squirting it everywhere.