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Replacing my subfloor

10K views 17 replies 5 participants last post by  DanBress 
#1 ·
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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#8 ·
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?
 
#10 ·
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
 
#11 ·
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.
 
#12 ·
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?:whistling2:

Jaz
 
#13 ·
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.
 
#14 ·
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?
 
#15 ·
Dan,

That's it, how else would you do it? :thumbsup: 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
 
#17 ·
Plywood is ALWAYS installed perpendicular to the joists. Make sure you offset the seams. Be sure to fasten the top sheet only to the subfloor. Do not fasten the top sheet to the joists. Don't forget the proper gaps between sheets and also around the perimeter.

BTW, the subfloor should also be glued to the joists. The underlayment is NOT glued to the subfloor.

Jaz
 
#18 ·
What do you mean by "proper gaps between sheets"? If I use T&G wont the sheets lock in with one another?

How much room should I leave around the perimeter?

So, I will fasten the bottom sheet to the joists with glue AND screws. But how should I fasten the top sheet to the bottom sheet?
 
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