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Old 08-14-2014, 12:22 PM   #1
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Screw pattern and size for 3/4" plywood subfloor?


Hey there, I'm getting read to screw and glue some subfloor in. I bought subfloor glue and will be putting it on the joists (should I just do a zigzag?) before I screw them in. To screw them in, I was planning on getting #8 2" fully threaded construction screws.

Is that a good idea? Should I get partially threaded instead? Should I alternate between full and partially threaded? How many inches between the screws?

Thanks a ton guys!

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Old 08-14-2014, 03:34 PM   #2
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Screw pattern and size for 3/4" plywood subfloor?


Faster, easier, and far cheaper to use 8D ring shanked nails.
If your going to use screws then go with 2-1/2" ceramic coated decking screws.
Us an impact driver not a cordless drill.

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Old 08-14-2014, 03:40 PM   #3
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Screw pattern and size for 3/4" plywood subfloor?


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Originally Posted by joecaption View Post
Faster, easier, and far cheaper to use 8D ring shanked nails.
If your going to use screws then go with 2-1/2" ceramic coated decking screws.
Use an impact driver not a cordless drill.
Already bought the plywood?
Advantech is a far better subfloor then plywood.
If you have the plywood already it is T & G and 3/4" subfloor rated, right?
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Old 08-14-2014, 04:03 PM   #4
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Screw pattern and size for 3/4" plywood subfloor?


Whoaa, 2 1/2"! I've heard that before but some others told me that size is too large. I do have an impact driver so that's nice.

I can't use t&g because I had to cut out a weird shaped section that was all rotted. I looked EVERYWHERE (everywhere!) for advantech but couldn't find it.

Last edited by amateurplumber; 08-14-2014 at 04:07 PM.
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Old 08-14-2014, 07:16 PM   #5
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Screw pattern and size for 3/4" plywood subfloor?


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Originally Posted by amateurplumber
I can't use t&g because I had to cut out a weird shaped section that was all rotted.
Well then you'll need to block under all the unsupported ends before you install it. Either that, or apply a second sheet over it offset to the first of course.

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Old 08-14-2014, 07:22 PM   #6
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Screw pattern and size for 3/4" plywood subfloor?


Got a picture of this patch?
Always better to cut out a larger area then to just try and make a small patch.
It needs to span at least 2 joist.
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Old 08-14-2014, 07:47 PM   #7
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Screw pattern and size for 3/4" plywood subfloor?


Quote:
It needs to span at least 2 joist.
Right, I forgot to mention that except...... the patch needs to rest on 3 joists. So 32" is the smallest it should be, otherwise you add an underlayment over the sub.

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Old 08-14-2014, 08:26 PM   #8
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Screw pattern and size for 3/4" plywood subfloor?


Ok, so, please dont crucify me but this is what I ended up doing. I put a 2x8 under the left and right sides to make a nailing edge. I screwed it into the base of the walls frames and the plywood lips, and glued the crap out of it. Here's an image. It's a little outdated...I added all new insulation and added another tiny strip of nailing edge to the right side. I couldnt do a solid undisturbed length on the right side like I did the left side because there were so many pipes. I sistered the middle joist.

I can still open up the bottom ceiling to add some blocking, but it'll have to be horizontal if i can do it at all. There's a big drain that runs through most of the left side and a few different pipes that go through the right side.
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Old 08-14-2014, 08:47 PM   #9
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Screw pattern and size for 3/4" plywood subfloor?


Oh boy.
Little blocks of wood will do 0 good.
Subfloor should have been cut out with a toe kick saw even with the bottom plates or at least a sawsall.
Blocking should have been added between the joist.
Nailing plate needed to be added over that drain.
Sure looks like you tried to add to a 2 X 4 under the subflooring on the right, useless. Should have cut the subflooring back and added a 2 X 6 under the bottom plate.
That repair is not going to holdup to a tiled floor.
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Old 08-16-2014, 10:49 AM   #10
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Screw pattern and size for 3/4" plywood subfloor?


Quote:
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Oh boy.
Little blocks of wood will do 0 good.
Subfloor should have been cut out with a toe kick saw even with the bottom plates or at least a sawsall.
Blocking should have been added between the joist.
Nailing plate needed to be added over that drain.
Sure looks like you tried to add to a 2 X 4 under the subflooring on the right, useless. Should have cut the subflooring back and added a 2 X 6 under the bottom plate.
That repair is not going to holdup to a tiled floor.


If he adds blocking between the joists every 10" or so I think it would hold. He could easily add that around the plumbing, and then add nailers later to give more support.

I'd also plan on using a shower pan for this area rather than tile it.


Last edited by VinnieVega; 08-16-2014 at 10:51 AM.
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