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Posted by Red Green on October 10, 2009, 11:52 pm
>> > I've installed new 1/2" conventional gypsum drywall in the area
>> > between my kitchen countertop and the bottom of the wall cabinets.
>> > I'm looking for some decorative ceramic tile to use as a backsplash
>> > over/behind the sink and extend it around to the area over/behind
>> > the range. What I'd like to know is this:
>> > Once I find the tile I want to use on that wall, is it necessary to
>> > prime and paint the new drywall before applying the tile mastic? I
>> > haven't bothered to tape the joints yet; figure the 4x4 tiles will
>> > cover the joints anyway. Just wondering if the mastic or thinset
>> > mortar will adhere good enough to the bare drywall without any
>> > special prep.
>> I would certainly tape and level the joints so there is a flat
>> backing for the tile and so there is a continuous backing to prevent
>> any cracking of the tiles or grouting.
>
> I always cover the drywall after taping and muding with a couple of
> coats of latex primer before tiling.
>
>
Pure speculation:
Drywall would suck up the moisture from the tile adhesive causing it to
dry improperly and possibly weaken the bond. May depend on type of
adhesive.
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> between my kitchen countertop and the bottom of the wall cabinets.
> I'm looking for some decorative ceramic tile to use as a backsplash
> over/behind the sink and extend it around to the area over/behind the
> range. =A0What I'd like to know is this:
> Once I find the tile I want to use on that wall, is it necessary to
> prime and paint the new drywall before applying the tile mastic? =A0I
> haven't bothered to tape the joints yet; figure the 4x4 tiles will
> cover the joints anyway. =A0Just wondering if the mastic or thinset
> mortar will adhere good enough to the bare drywall without any special
> prep.