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Old 11-05-2011, 11:00 AM   #16
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Subfloor Overhaul - Advice Needed


You claim the subfloor is 1/2" thick. Please double check that. If it is a single layer subfloor system the minimum is 5/8" not 1/2". Was there another layer of structural plywood over the subfloor that was removed?

Remember that all plywood measures 1/32" less than its stated thickness. let us know what you find. Often the thickness can be read from below, is that a crawl space under there?

Jaz

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Old 11-06-2011, 03:59 PM   #17
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Subfloor Overhaul - Advice Needed


My (amateur) blocking is finished - ran into a few issues. Mainly one of the joists was slightly tilted so the blocking is horizontal rather than vertical. Next step - figuring out how to get the flange off! By the time the plywood, backerboard and tile is placed the current flange will be too low.




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Old 11-06-2011, 06:07 PM   #18
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Subfloor Overhaul - Advice Needed


I don't think you need to mess with the flange. There are options. No reason to open that bag of worms.
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Old 11-06-2011, 06:42 PM   #19
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Subfloor Overhaul - Advice Needed


IMO, its easier to fix the flange now than later. Cut the flange and PVC off a foot from the the top of the floor joist there. Glue a coupling and a 2ft section of pipe (2' sections available at home depot and lowes). You'll be left with a pipe that sticks up about a foot higher than your floor. Install your subfloor, backer, and tile around the pipe. After you're all done you can cut the excess pipe off flush with the floor and glue on a new flange. Flange spacers IMO cause more problems than they solve. Fix it now while the floor is open so you can get your flange resting on the floor when you're done where its supposed to be.
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Old 11-06-2011, 09:27 PM   #20
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Subfloor Overhaul - Advice Needed


I don't think you need to mess with the flange. There are options. No reason to open that bag of worms.
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Old 11-07-2011, 03:04 PM   #21
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Subfloor Overhaul - Advice Needed


I think I'm going to replace the flange - there is a portion that is cracked. My Dad was a plumber for many, many years and he thought it would be best to change it out while I still have easy access.

Also, from an earlier post, I verified that the remaining subfloor is indeed 1/2in. There wasn't another layer of plywood on top but there 1/2 in particle board (yuck!).

New questions:
1.) What is the best tool for screwing in plywood? All I have now is a cordless black and decker drill, I heard this won't work.

2.) Does the 2nd layer of plywood need to be screwed into the joists? I read that it should NOT be screwed into the joists so that there is room for movement.

Thank you! You guys are the best
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Old 11-07-2011, 03:19 PM   #22
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Quote:
I think I'm going to replace the flange - there is a portion that is cracked. My Dad was a plumber for many, many years and he thought it would be best to change it out while I still have easy access.
One would think you would have mentioned that little fact in an earlier post. Could have saved me two posts and trying to make your life easier.
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Old 11-07-2011, 03:27 PM   #23
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I like to get more than one opinion I do appreciate your information!

He has minimal experience with subfloors and your info has been a tremendous help with that too.
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Old 11-07-2011, 07:56 PM   #24
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Subfloor Overhaul - Advice Needed


So now that you're ready to continue....... what will you do with the subfloor sheeting? Are you keeping the original 1/2" ply in the other half of the room or not? Let us know your plans so we don't have to consider the several choices you may choose.

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Old 11-08-2011, 06:32 AM   #25
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Subfloor Overhaul - Advice Needed


My plan is to install 1/2in plywood in the area I took out to match the 1/2in on the other side of the room. I really want to avoid taking it completely out after experiencing what all is involved.

The bamboo floor outside of the bathroom is 1/2in (old) plywood, 1/2in (new)plywood, some kind of membrane (not sure what it's called) and 3/4in bamboo.

At this point, I'm not really sure how thick the new plywood or backboard should be. Any advice would be greatly appreciated!
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Old 11-08-2011, 06:28 PM   #26
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Quote:
My plan is to install 1/2in plywood in the area I took out to match the 1/2in on the other side of the room. I really want to avoid taking it completely out after experiencing what all is involved.
I don't blame you. Make sure you glue the new 1/2" to the joists. In addition, the new ply might be 1/32" thinner than the old it's replacing.

You should install minimum 1/2" underlayment over the 1/2" subfloor. Of course thicker is better if you can. The tile backer should be 1/4" with a layer of thinset under it, so that'l add about 5/16", then the tiles.

Jaz
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Old 11-14-2011, 11:13 AM   #27
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Subfloor Overhaul - Advice Needed


Update - I installed 1/2in plywood to match the other side of the room. Wasn't too terribly difficult but the hole for the toilet is more oblong than round (I'm terrible with measuring).

Next weekend, I'll be securing the plywood (as of now I just cut and placed) with adhesive and 2 inch deck screws. The next layer will be 3/4in and I plan on staggering. I was told not to screw the 2nd layer into the joists so I'll use 1.5 inch screws for this. Is this correct?

The following weekend will be the 1/4in backboard.

Thanks for your help! I'll continue posting updates in case anyone has any helpful info/advice to add It's greatly appreciated!
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Old 11-14-2011, 12:45 PM   #28
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Sounds good so far.

Quote:
I was told not to screw the 2nd layer into the joists so I'll use 1.5 inch screws for this. Is this correct?
Perfect, that's the preferred method. Keep us posted.

Jaz
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Old 11-16-2011, 07:26 PM   #29
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Subfloor Overhaul - Advice Needed


I've decided to get a professional to finish up the floor...I just don't have the time and I'm really not that great at it

However, I received one estimate today and he said that only 1/4in more plywood should be installed (over the current 1/2in) and 1/4in backerboard. Is this sufficient? I'd really like to do 3/4in plywood just to "beef" up the floor.

Also, when I installed the first layer of 1/2in plywood - the guy at Home Depot convinced me that I could go with the "cheaper" grade. I think it was $12 for a sheet. Now that I have it placed, I'm wishing I had gone with better quality. Will this lower grade quality plywood be okay on the bottom?

Thank you!
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Old 11-16-2011, 08:01 PM   #30
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Subfloor Overhaul - Advice Needed


Quote:
I've decided to get a professional to finish up the floor.
Good for you. Keep doing what you know best.

Quote:
However, I received one estimate today and he said that only 1/4in more plywood should be installed (over the current 1/2in)
Oh boy. I thought you said you were gonna hire a professional? Find a tile setter that knows industry specs, not a guy that sets tiles now and then.

1/4" ply adds very little strength and should never be a part of a tile installation sandwich. Especially since your 1/2" subfloor meets no specs as 5/8" is the minimum, which in my opinion is scary enough. You don't need 3/4" over the 1/2", (the more the better), but please go with at least 1/2" or better yet 5/8". I believe 1/2 + 1/2 is about the same as a single 3/4".

Quote:
Also, when I installed the first layer of 1/2in plywood - the guy at Home Depot convinced me that I could go with the "cheaper" grade. I think it was $12 for a sheet. Now that I have it placed, I'm wishing I had gone with better quality. Will this lower grade quality plywood be okay on the bottom?
Why the %4#7*! do you even listen to those people? You bought sheathing not underlayment. It's probably CDX right? Now that it's down keep it.

I think you bought item#166073 @ $12.97, which states it is; Plywood sheathing delivers outstanding stiffness, strength and versatility. It is an excellent choice for light frame wall and roof assemblies in weather protected applications.

You should have bought item #166030 @ $21.47, which states..........do-it-yourself projects, cabinets, shelving and furniture to porch ceilings, soffits and flooring underlayment........

I have learned many years ago that, paying too little for something is often the most expensive way to go.

Jaz

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