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Old 11-03-2011, 10:52 AM   #1
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Subfloor Overhaul - Advice Needed


I came across this forum as I was trying to search for an answer to my subfloor questions. I couldn't find the answers anywhere so I'm hoping to get some soild advice here

I started what was supposed to be small remodel of my guest bathroom. As I was tearing out layer of linoleum, I realized that the wax seal on the toilet had disintegrated and the entire floor was damaged beyond repair (rot and mold). I had originally planned on putting new plywood over the old but instead I was forced to rip it all out. What I'm left with are just the joists.

My question is, I know that plywood should be screwed to the joists but what if a joist isn't available for each plywood side (mainly against the wall). There is a few inch void between the wall and the nearest joist. Is this when "blocking" comes in? Or will I have to take out the wall studs, place the plywood then replace the wall studs? (I hope this one isn't the case).

Any advice on this particular concern or any advice on subflooring is very much appreciated!

Thanks,
Kim

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Old 11-03-2011, 08:22 PM   #2
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I'm so bummed that no one has offered any advice...ugh. I think I found a video on youtube that explains what I need to do ("blocking"). This is my first major DIY project so hopefully it works!

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Old 11-03-2011, 09:42 PM   #3
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I've been here all day and this thread has not been here. I guess it was off in cyber land somewhere.

Yup install blocking. That's the only way to firm it up.
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Old 11-03-2011, 09:58 PM   #4
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Quote:
Originally Posted by Bud Cline View Post
I've been here all day and this thread has not been here. I guess it was off in cyber land somewhere.

Yup install blocking. That's the only way to firm it up.
Probably in the wrong forum.
A mod most likely moved it.
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Old 11-03-2011, 10:20 PM   #5
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Quote:
Probably in the wrong forum.
A mod most likely moved it.
H-m-m-m-m! I spent the day fishing the "New Posts" and I thought I would have picked up on a thread that said; "Subfloor Overhaul".
Go figure.
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Old 11-04-2011, 10:00 AM   #6
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Yay! Responses

I have another question: what is the best tool for removing the subfloor alongside the walls?

I've been doing online research and it looks like the best tool is the Dremel but I was hoping there would be more inexpensive way. The area that I need to remove is not too large so even if there is a way to do it by hand would be helpful (hammer and chisel?). If a tool it the absolute best way, what tool would you recommend?

Thanks!
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Old 11-04-2011, 11:11 AM   #7
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Quote:
I've been doing online research and it looks like the best tool is the Dremel but I was hoping there would be more inexpensive way.
So by "more inexpensive" you mean less expensive???

Use a circular saw to get as close to the wall as you can. The edge that is allowed to remain by the saw is where you would center some blocking.

I'm thinkin' I wouldn't be beating on that type of material with a hammer and chisel too much.
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Old 11-04-2011, 11:17 AM   #8
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You post must have been circling for hours like a plane waiting for a storm to pass.

This is the first that I saw it,too.

Buds has the standard and proper advice on this---leave 1 1/2" around the edges and screw blocking into that 'lip'.
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Old 11-04-2011, 12:59 PM   #9
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Looks like you have a jigsaw...you can use that and just run it along the wall. You'll have an inch left over but that will be fine. I'm with Bud...I would not want to be pounding on all that with a hammer and chisel if I could avoid it.

Remember, it does not matter if it looks pretty, it matters if the floor is properly supported. That can be done with blocking and sistering as required. If a strip of the old plywood remains that's no big deal provided it's level with the new ply that you put down.
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Old 11-04-2011, 07:49 PM   #10
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So I went to Home Depot to look at tools for cutting the subfloor along the wall (I unfortunately have to get as close as possible due to the rot). I found an awesome tool that although labor intensive has worked like a charm! http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053

I've used this (plus a standard handsaw) to do 1 wall so far, the rest I'll do tomorrow.

I'm still trying to figure out whether or not to take the old plywood on the other half of the room out, it's not rotten, just old. It is 1/2in thick and I'd like to have 3/4 in for the entire room - not sure if plywood comes in 1/4 in to level it out. Any suggestions/advice on this? Should I just replace ALL the subfloor?
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Old 11-05-2011, 09:35 AM   #11
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I'd suggest pulling the entire subfloor ---leaving 1 1/2" or so around the perimeter to allow

you to screw blocking to the old sheeting and the new.

Avoid 1/4" ply---it has a tendency to pucker when wet and is not suitable under cement backer.
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Old 11-05-2011, 09:56 AM   #12
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Well, I was able to cut the subfloor out along the wall with hand tools.
Still have to do the other half of the room which has 1/2in plywood. Should I avoid 1/4in plywood if it is going OVER 1/2in plywood? The plywood is in decent shape and would save me loads of work - BUT I do want to do it the correct way.

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Old 11-05-2011, 10:00 AM   #13
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A better option might be to make the repair using 1/2" again--

Than top the whole room with another layer of 1/2" or 3/8"
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Old 11-05-2011, 10:28 AM   #14
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That is an excellent idea - replace the removed part with 1/2 inch and then add 3/8in. Thank you!
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Old 11-05-2011, 12:00 PM   #15
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Don't forget to stagger your seams for both the first layer and second layer (like a running bond brick wall). Make sure top layer's seams don't line up over first layer.

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