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Old 09-04-2007, 07:59 PM   #1
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Raising floor/tile porch subfloor


Even titling this is confusing! We built this house 7 years ago and had frost walls put under the 12X16' concrete patio for a future screen porch (we live in WI). We step down from the kitchen onto the patio currently, but want to raise up the new porch floor to the kitchen floor height, a total of 6 7/8". We want to have a tiled porch floor (12x12 porcelain tiles; 1/4" thick). How would you recommend raising the floor and using what materials?

Thanks for any input.


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Old 09-04-2007, 09:24 PM   #2
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How would you recommend raising the floor and using what materials?
2 x 6 (5.5")

3/4" marine grade plywood (.719") virtually 3/4"

1/4" Durock (.25")

1/4" tile (.25")

compared to your 6.875" leaves a little over 1/8". Thinset over and under the durock will be at least this much.

Another possibility (maybe my preference if it was mine, for rigidity's sake)

2 x 4's layed flat perpendicular to joist direction (1.5")

2 x 4's as joists, standing up (needless to say) (3.5")

3/4" marine grade plywood (.719")

1/2" plywood (.469")

1/4" durock (.25")

1/4" tile (.25")

again, compared to your 6.875" leaves a little over 1/8", which thinset would take up.

Unmodified Thinset under durock to fill voids.

Modified on top for tile.

I would put the joists (and the flat 2x4's if applicable) on 12" centers. No bigger than the room is, the difference in quatity for 16" centers and 12" is only maybe 5 joists.


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Old 09-04-2007, 10:05 PM   #3
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All those parts add up to just the right amount for sure. I'm not so sure I would like to build the floor up that way though? I would want the new subfloor system to be mechanically attached to the slab, otherwise as soon as the lumber stats to twist, the whole thing is gonna bounch.

I think I'd want some foam panel insulation in there too.

Being that it is only a screened porch, I have a strong feeling that the floor is going to get wet. If that happens you're going to have big problems. In that case you'd have to use a waterproofing method and of course the deck has to be sloped at least 1/4" per ft., and the water has to have a way to get out of the structure.

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