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Old 10-04-2016, 04:07 PM   #1
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Fixing underlayment


I recently tried to replace a bathroom sink vanity to discover the floor under it was never finished. There was a large section of subfloor exposed through a rather thick underlayment.

It's a rather small bathroom area so I just decided to redo the whole floor.

- I tore up the underlayment and fixed all the squeaks in the subfloor using deck screws.
- I got a 19/32" plywood board to put over the floor since it was closest in thickness to my existing underlayment (http://www.homedepot.com/p/19-32-in-...6081/100004472).
- I laid out a layer of SVS underlayment on top of the subfloor to try to remove wood on wood contact in a hope to avoid squeaks (http://www.homedepot.com/p/Roberts-2...-198/205129063)
- I cut and fit the plywood pretty well and put it on top of the SVS underlayment.

I am now trying to decide my next steps. I have vinyl tiles that I plan on using (http://www.homedepot.com/p/TrafficMA...219S/204476767).

The underlayment bows up in the center so I need to fasten it to the subfloor. I've read that I should use staples to fasten the underlayment to the subfloor since they will avoid squeaks better than ring nails, but then I need to find the proper kind of staples that are long enough to go through the 19/32" subfloor and fasten well enough into the subfloor to hold (and I guess also rent a pneumatic nail gun.)

After that I plan on leveling the surface of the plywood (since there are knots and gaps) with a patching compound (http://www.homedepot.com/p/Red-Devil...A-D24-Paint%7c)

Can anyone help me figure out the right type of staples to use that will hold tight and not cause squeaking later on? Are there other things that I need to keep in mind?

Thanks for your help!
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Old 10-04-2016, 07:28 PM   #2
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Re: Fixing underlayment


#1, Looks like you used the wrong subflooring, it's going to be full of voids in the core.
The right one would have been sanded and said underlayment rated, not sheathing grade.
If the old floor was not flat the best way is to go under the floor and see what's causing it and fix it before adding another layer.
Wrong filler for seams and flaws, use something like this instead.
http://www.homedepot.com/p/DAP-32-oz...9184/100111165
Can not imagine renting a narrow crown staple gun when there cheap enough to just buy one.
http://www.homedepot.com/p/NuMax-Pne...9032/203735815

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Last edited by joecaption; 10-04-2016 at 07:32 PM.
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Old 10-06-2016, 10:43 AM   #3
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Thank you Joe! Looks like I'll need to switch out my underlayment.

Quote:
Originally Posted by joecaption View Post
Can not imagine renting a narrow crown staple gun when there cheap enough to just buy one.
http://www.homedepot.com/p/NuMax-Pne...9032/203735815
What type of staples do I need to use and what size?
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Old 10-06-2016, 11:46 AM   #4
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Re: Fixing underlayment


Did you bring up the nail gun I posted?
It's narrow crown staples, I use mostly 1-1/4.
Never use glue, needs to be nailed every 4" on the seams , 6 to 8" in the field.
Do not have the seams or nail into the joist.
I'd also add decking screws to the old subfloor and lay down some tar paper before installing the underlayment.
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Old 10-06-2016, 05:46 PM   #5
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Re: Fixing underlayment


Thanks again Joe!

Just to make sure I get this right:
My underlayment is ~ 19/32"

The right size staple for this is 1.25" which doesn't need to be stapled into the joist. This is the right size staple even if the length of the staple is greater than the thickness of the underlayment and subfloor combined?

Any narrow crown staples work (I don't need to get the staples with glue on them that bind with friction heat?).

Regarding tarpaper, would my Silicone Vapor Shield Underlayment paper serve the same purpose in that it help avoids the wood to wood contact?
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