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Old 01-21-2008, 02:47 PM   #1
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Should I replace the sub-subfloor? Pix Attached


I'm going to be tiling my foyer. I pulled up the existing hardwood floor to add another layer of 3/4" plywood subfloor and the existing subfloor looks like there are a lot of voids. I'm wondering if I should remove the existing subfloor and then add 2 layers of plywood instead of just one layer over the existing plank subfloor. What do you think?
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Cliff
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Old 01-21-2008, 03:18 PM   #2
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Should I replace the sub-subfloor? Pix Attached


I dont really see any point into ripping out this subfloor if you are planing on putting another subfloor on top of it. You can just put the 3/4 on top of the pre-existing floor that is there. Replaceing the the pre-existing subfloor will cost you more. So to save some money just put the 3/4 on top of it. the only suggestion that i can give you is to make sure the joints on the 4ft side of the 3/4 is on a joist that will help with support. If you do that you wont have to worry about the 3/4 being on a part of the weak flooring.

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Old 01-21-2008, 05:53 PM   #3
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Should I replace the sub-subfloor? Pix Attached


Ayuh,..... I Agree, No reason to rip it up for nothing......

Well Mark where the joists are,+ Put the Screws to it...........

More Screws,......... Less Squeaks.........
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Old 01-21-2008, 06:14 PM   #4
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Should I replace the sub-subfloor? Pix Attached


I spoke with the folks at the tile store and they said the subfloor should be 1 1/2" thick. I guess I'm thinking, how much can the existing subfloor contribute to stiffening up the floor when there are all these holes and gaps?
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Old 01-21-2008, 06:26 PM   #5
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Should I replace the sub-subfloor? Pix Attached


Quote:
how much can the existing subfloor contribute to stiffening up the floor when there are all these holes and gaps?
Ayuh,......... Alot........
There's Still Strength thru Structure there......
The Gaps,+ Especially the Holes are pretty much Irrevelant..........


Are you putting Cement board over the Plywood,..??....
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Old 01-21-2008, 07:34 PM   #6
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Ayuh,......... Alot........
There's Still Strength thru Structure there......
The Gaps,+ Especially the Holes are pretty much Irrevelant..........


Are you putting Cement board over the Plywood,..??....

Thanks
I'll be using Ditra instead of a cement backer board.
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Old 01-21-2008, 10:40 PM   #7
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Should I replace the sub-subfloor? Pix Attached


the second layer of subfloor will spread the load of the tile out enough they want you to put two layers of subfloor for support of the tile. you will never have enough forec on one of the cracks or holes to do anything and it it can support it the 3/4 will support it. http://pshomehelp.com
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Old 01-22-2008, 06:49 AM   #8
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Should I replace the sub-subfloor? Pix Attached


Thanks, I'll leave the existing planks. Should I run the plywood perpendicular to the joists or planks?
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Old 01-22-2008, 07:32 AM   #9
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Should I replace the sub-subfloor? Pix Attached


Add some insulation LOL

run the plywood perpendicular to the joist
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Old 01-22-2008, 08:42 AM   #10
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Should I replace the sub-subfloor? Pix Attached


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Thanks, I'll leave the existing planks. Should I run the plywood perpendicular to the joists or planks?
Yes, use liquid flooring adhesives (subfloor adhesive - PL/liquid nail)-along with your fasteners (nails/screws).

Make sure that you go over any boards and re-nail the loose ones prior to installing the plywood...
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Old 01-22-2008, 09:20 AM   #11
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Two more questions, what type of plywood should I use, CDX, T&G,...? I should be using 3" screws, right?
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Old 01-22-2008, 10:57 AM   #12
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Should I replace the sub-subfloor? Pix Attached


The type of sub flooring is up to you, and your budget. You always want to go with a tounge and groove sub floor. I dont personally like Advantech T&G its easy to work with, lays flat and is easy to install the tounge and groove. thats just what i noticed when using it. I would use 3 inch screws
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Old 01-22-2008, 01:41 PM   #13
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Should I replace the sub-subfloor? Pix Attached


Have you checked to see if the floor joists are adequate for tile? It looks like what you have are 2x8 at most (maybe even 2x6). Check the size and span to be sure they will give you a stiff enough floor. If they need beefing up now would be the time to do it.
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Old 01-22-2008, 03:07 PM   #14
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Have you checked to see if the floor joists are adequate for tile? It looks like what you have are 2x8 at most (maybe even 2x6). Check the size and span to be sure they will give you a stiff enough floor. If they need beefing up now would be the time to do it.
Thanks for thinking ahead. Yes, I covered that in a previous thread. You're correct, there are only 2x8s with a 12' span on 16s. I'll be sistering the 2x8s to stiffen the floor assembly.
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Old 01-22-2008, 04:53 PM   #15
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Should I replace the sub-subfloor? Pix Attached


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The type of sub flooring is up to you, and your budget. You always want to go with a tounge and groove sub floor. I dont personally like Advantech T&G its easy to work with, lays flat and is easy to install the tounge and groove. thats just what i noticed when using it. I would use 3 inch screws
....Are you saying that you don't like AdvanTech Flooring?....By what you wrote, it sounds like you do.

We prefer it, and so do just about every contractor I know...

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