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Old 09-21-2009, 12:01 AM   #1
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Mapei Premium Premixed Mortar


I am going to tile around a gas fireplace with slate tile. The area the tile will be going on consists of drywall.

Can I use the Mapei Premium Premixed Mortar?


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Old 09-21-2009, 06:00 AM   #2
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not a good idea. Slate is too heavy. Use thinset.

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Old 09-22-2009, 01:12 AM   #3
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Originally Posted by Bob Mariani View Post
not a good idea. Slate is too heavy. Use thinset.
I got a bag of the grey Mapei UltraFlex II.

When it states "properly primed gypsum", what do they mean?

I have 5/8" fire rated drywall that is screwed down to a plywood base. This is around the fireplace area. Does this mean I have to "primer" the drywall prior to using the thinset over it?
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Old 09-23-2009, 12:26 AM   #4
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Drywall is not Gypsum. Well, it is in the middle but the Gyp is covered with paper. You do not prime wallboard to install tiles to it.

You said the drywall is screwed down to a plywood base. Why is that? Is this the floor? I don't get it.

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Old 10-01-2009, 07:00 AM   #5
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Originally Posted by JazMan View Post
Drywall is not Gypsum. Well, it is in the middle but the Gyp is covered with paper. You do not prime wallboard to install tiles to it.

You said the drywall is screwed down to a plywood base. Why is that? Is this the floor? I don't get it.

Jaz
The base of the fireplace was covered in granite tile. When it was ripped out, the gypsum board was damaged with the removal of the tiles. Underneath the gypsum board is a plywood base.

So I installed 5/8" fire rated gypsum down and it was screwed down to the plywood base.

Here are some pics:
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Old 10-01-2009, 09:12 AM   #6
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The "gypsum" they are referring to I think is the fillers like [joint compound] used to make the seams.

By the way that wood material in the picture isn't plywood from what I can see.

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