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Old 02-09-2008, 10:14 AM   #1
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Replacing my subfloor


I am remodeling my 8x10' kitchen, and have gotten down to the subfloor only to realize its fairly damaged. The wood is completely rotted where the sink used to be, and one of the floor joists is rotted as well. The subfloor is 1" thick hardwood strips nailed right on top of the joists.

my plan is:
remove the old strips using a circular saw, and maybe a sawzall.
remove the rotted joist and replace with a 2x6(I have access underneath, I dont see this being difficult)

buying T&G plywood to put down as a subfloor nailed and glued to the joists.

then installing cement backerboard over the plywood, as i want to install tile.

Does this seem reasonable?

Are there any tips or tricks i should know when installing the subfloor?

Also: I plan on tiling this room, and the adjacent room. The adjacent room's floor is fine, but is also 1" wood floor, with 2 tight layers of linoleum tile on them.

I was planning on buying 1 1/8" T&G plywood to use as the subfloor, so that way it will be level with the other room(1" + 2 linoleums), but I can't seem to find 1 1/8" tile anywhere.

What are my other options? 2 layers of 19/32" T&G plywood? any ideas here?

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Old 02-09-2008, 11:25 AM   #2
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Replacing my subfloor


Locate the seams on a joist for strength.

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Old 02-09-2008, 11:48 AM   #3
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Replacing my subfloor


Do I want to install the subfloor so that it buts right up against the frame of the room, or should i leave a gap(1/8"?) for expansion?
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Old 02-09-2008, 11:59 AM   #4
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Replacing my subfloor


Quote:
remove the rotted joist and replace with a 2x6

HOLD IT!!

Are all the floor joists 2" X 6"?

If so you can probably forget ceramic tile, period.

What size are the floor joists? (really)
What is the spacing of the floor joists?
What is the unsupported span of the floor joists.
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Old 02-09-2008, 02:51 PM   #5
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Replacing my subfloor


GREAT catch Dan :}:} my thoughts exactly. 2 x 6 with that load in a NO NO. Now since Dan says he has access under then If he would run a girder at midspan underneath than he should be ok.
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Old 02-09-2008, 04:29 PM   #6
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Maybe!
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Old 02-09-2008, 06:22 PM   #7
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DAN sorry I meant kudo's to you LOL LOL, damn senility goin big time tonight
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Old 02-09-2008, 07:05 PM   #8
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Replacing my subfloor


OK, the joists are 2" wide, and 6.5" tall. what do you call this piece of wood?

they span an unsupported distance of 61"


the kitchen is as follows


on the basement level there is a stone room off the back of the house.
the interior of the wall is 61" across. This is the way the joists run.

I don't know how deep the room is, but i would get its about 92-100" deep.
the stone walls are about 18" thick

the kitchen sits on top of this and overhangs a little, so its interior size is 8x10

Is this ok to install tile on?
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Old 02-09-2008, 07:07 PM   #9
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Replacing my subfloor


p.s. the room is 90" deep
and the joists are 16 on center.
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Old 02-09-2008, 07:24 PM   #10
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Replacing my subfloor


Dan,

Are you saying the joists are supported by this stone wall? Are you sure? Normally that type of wall is built after the joists are installed and it might just go up to it....no?

So the joists are an actual 2"x6.5"? Is this a very old house or did someone built it themselves?

Jaz
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Old 02-09-2008, 07:50 PM   #11
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Replacing my subfloor


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Dan,

Are you saying the joists are supported by this stone wall? Are you sure? Normally that type of wall is built after the joists are installed and it might just go up to it....no?

So the joists are an actual 2"x6.5"? Is this a very old house or did someone built it themselves?

Jaz
This is an extension room off the back of the house. there are 3 walls, all stone. the joists are actual 2"x6.5" and the stone is cut away to seat the joists. If these stone walls aren't supporting the joists, then I dont know what is because there is nothing else there.

the house was built in 1927, by a professional builder.
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Old 02-09-2008, 10:10 PM   #12
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Replacing my subfloor


OK, so the span is 5'1"? If so there is no problem with the joists system if in good condition. You can use new 2x6 or rip 2x8 for the replacements.

I'm not sure where we are now. Maybe you should recap the project?

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Old 02-09-2008, 10:14 PM   #13
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Replacing my subfloor


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OK, so the span is 5'1"? If so there is no problem with the joists system if in good condition. You can use new 2x6 or rip 2x8 for the replacements.

I'm not sure where we are now. Maybe you should recap the project?

Jaz

Right now I am at the beginning

tomorrow I plan on ripping out the flooring
One of the joists is rotted pretty bad so I am going to go to home depot and look for the best replacement for that, as well as the best way to get 1 and 1/8" worth of plywood subflooring down.
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Old 02-15-2008, 10:54 AM   #14
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Replacing my subfloor


I need to replace a section of subflooring, where the current subflooring is 1 and 1/8" thick, and I would like them to be as close to level as possible.

My local home depot and loews don't carry 1 1/8" T&G plywood, so I was planning on getting two sheets and stacking them. Is this a bad idea? What is a better idea?
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Old 02-15-2008, 01:24 PM   #15
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Replacing my subfloor


Dan,

That's it, how else would you do it? Remember though that plywood is thinner than its stated thickness by 1/32". You may need to install a few sheets of tar paper first? Af course be sure to use "subfloor" plywood first then you can go with underlayment on top.

Jaz

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