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Unread 03-10-2006, 08:36 AM   #1
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what to use as a subfloor

I have a hallway that I want to put down an electric heating mat and then to tile. Right now it has carpet. I picked up the carpet a little from the edge and see a wood subfloor. I think that this hall is above a concrete room which is a well room. I was thinking of using some type of stone, maybe ceramic tiles. Do I need to test the deflection? Or should I just screw down CB? Do I need adhesive besides the screws? To the top of this I will glue the mat, and then thinset over it, wait until dry and then thinset the tiles.
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Unread 03-10-2006, 08:53 AM   #2
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Welcome, Rich.

You need to at least calculate the deflection of the floor structure, especially if you elect to use natural stone tiles.

You need to know the type, size, spacing, and longest unsupported span of the joists, and the type, thickness, and number of layers of subflooring over the joists.

Let's start with that.

My opinion; worth price charged.

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Unread 03-10-2006, 12:45 PM   #3
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Problem is that the room below has a ceiling made from concrete. So I can't see it from below! How about if I went with ceramic tiles instead? Would that make any difference?
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