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allfy16 10-20-2012 01:42 AM

Tiling kitchen. Floor uneven. Going crazy!
6 Attachment(s)
Hi, I am new to pretty much everything DIY but am trying to learn so that I can fix up/repair/renovate my house myself. Any help is greatly appreciated.

I am attempting to tile my kitchen floor but am running into some problems.
First, the kitchen floor had a hump running down the joist in the middle of the floor. I removed most of the OSB subfloor and found that the joist was causing the hump and was about 3/4"-1" higher than the other joists. So I ground it down and installed 3/4" plywood.

Then I noticed the plywood I just put in was still raised up and sloping from the joist I just ground down. The unevenness didn't seem too bad so I went ahead and put down some thinset mortar and began laying the cement board on top and screwed it down.

After laying my 4th board, I placed a tile on top of one just to make sure it lay flat. When I pushed on the edges of the tile, the other side would raise up slightly (I would guess around 1/16").

Fearing the unevenness of the cement board and raising of the tile would make tiling the floor impossible, or end up cracking the grout and/or tile, I got frustrated and quit for a couple days. When I resumed working, I took up the cement board then spent 2 1/2 frustrating days scraping up the dried thin set mortar.

I also noticed that the original OSB subfloor that I didn't cut out is raised up to 1/8" above the plywood I installed, but then is flush with the plywood in other spots along the same joist. Should I chisel it down?
Attachment 59113

So...What can I do about evening up the subfloor? I bought some self leveling underlayment (Henry 565 FloorPro) but it was $36/40lb. bag, and the directions say it only covers 43 sq.ft. at 1/8" thickness. My kitchen is about 120 sq.ft. so if I had to level the whole floor with it, it would cost about $120. :censored:
Could I just use more of the thinset mortar to even out the low areas, or would the cement board still lay unevenly?
Attachment 59112
Attachment 59114
Attachment 59115
Attachment 59116
Attachment 59117
Kitchen-120 sq.ft.
Thinset Mortar-Mapei (it's polymer enriched!)
Subfloor-3/4" plywood and 3/4" OSB
Joists-16" on center
Tile-12"x12" porcelain
Cement Board-1/4" UltraBacker

Any help is greatly appreciated!

oh'mike 10-20-2012 06:01 AM

It's to early to think------

All flattening efforts from this point will be done from the top of the backer board.

Set the board into a bed of morter and nail it down---roofing nails spaced about ever 8 inches---or screw if you prefer--

Them use the self leveling compound----read the bag---I believe henrys requires a primer----I use Jif-set and mix the first layer with a liquid latex

I can't help the cost----tile setting can be costly to do properly-----and very expensive when done wrong.

only a small amount of correction can be acheved with thinset----to much mud and the tile will drop as the thinset settles and cures----

Leveling clips can be used during the instalation-----they work well--but add a lot to the cost of installation.

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