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pamh 04-11-2013 01:06 PM

raising floor level, moisture issues?
I am raising the level of a ceramic tiled floor to match with the rest of the kitchen. I will be building up the floor app. 2.5" using ripped joists and resting them directly on the old tiled floor. Then 3/4" subfloor, 1/4" underlay and finally Marmoleum Dual tile 20" squares. My question is whether or not there will be a "trapped" moisture issue between the old and new flooring materials. I am NOT taking out the old ceramic tile. This space is above an exterior, closed in 5 foot high "crawl space/storage area". The floor is insulated from underneath with bat insulation. Thanks for any expertise...

jeffnc 04-11-2013 01:16 PM

It really depends on how the ends of those 2.5" "joists" are attached. It seems a little weird because your entire floor will basically be floating, right? You haven't fully explained how this subfloor will be installed.

If you think about it, there's a "trapped" space between the first and second floors of most houses, and there's never a moisture issue there even if the upper floor is tiled. Under your floor is a crawlspace which is a little different....

pamh 04-11-2013 03:43 PM

Here are the layers, starting from the ground up:Cement slab on grade
5' of crawl space/storage area
2x10 joists with bat insulation
3/4 " ply subfloor
1/4 " underlay
Ceramic tile
~2x3 sleepers (sitting directly on tile)
3/4" ply
1/4" underlay
Marmoleum 20x20 squares

Will moisture (water vapor) become trapped between the old and new floor? Or will any vapor that may be between the layers pass through the ceramic tile layer and/or the linoleum tile layer?

TheJerk 04-11-2013 05:00 PM

Your ceramic tiles are designed for a wet area, to help prevent water from passing through to the sub-floor/joists and damaging them. Your Linoleum basically has the same purpose.

But you want to know if water vapor can pass through them?

I just want to make sure we understand the question.

Also, you say 2 x 3 sleepers "sitting" on the ceramic tile. How do you plan on securing these? Are you going to screw them through the floor? Tie them into the wall studs? How far apart are you planning on spacing them? Even if if you place them only 2 inches high, with the 3/4 and 1/4 your going to be higher than the room your adjoining it to.

joecaption 04-11-2013 08:27 PM

I've got to be reading this wrong.
Installing sleepers on top of a tile floor without removing the tle first?:eek:

pamh 04-12-2013 06:35 AM

I am simply asking if a layer of ceramic tile and a layer of linoleum tile will trap moisture in the ~2" of air space between them? There is no reason to put ~144 sqft of ceramic tile/underlayment debris into a landfill....
I don't have any "code" questions.
I'm simply wondering if the two layers will potentially trap moisture and thereby potentially grow mold and thereby potentially stink...

TheJerk 04-12-2013 05:20 PM

Well then, do it and come back and let us know how it works.

Have a nice day and enjoy the science experiment.

pamh 04-12-2013 06:09 PM

Aptly named
I can see how TheJerk got his name....

joecaption 04-12-2013 07:02 PM

You may be getting offended but this whole idea just makes no since for a bunch of reasons.
1/4" anything should not have been laid under tile,
There's no good reason I can think of to install a raised floor over old tile.
That concerned about dumping it in the land fill then find some looking for clean fill.

Why is that floor 2-1/2" below the other floor?
20 X 20" tiles would require a perfectly flat 100% none flexing floor.

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