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Posted by on June 8, 2006, 11:06 pm
Your experience is more like mine with this bathroom floor. Perhaps
mastic formulations have changed since 1970 or so. This stuff holding
those mosaics on the floor was quite hard, and appervious to any water
treatment.
Oh well.
bill allemann wrote:
> I don't know what the deal is on mastic. I used mastic (a good $$ grade
> from a real tile supply house) directly on
> plywood, and not a thing has budged in 23 years. This is a rental unit
> that's had over a dozen tenants.
> Also used in in the bath area, but a black seal coat was put down first.
> Also, no defects. Same groat, no
> maintenance at all.
>
> I wonder sometime if the cement board thing is mostly marketing.
>
> Bill
>
> > Thinset in water areas are the way to go.
> > Mastic works nice when you work from the
> > middle and go down. I found that with a thinset
> > applied the tiles will start sliding down the wall.
> >
> > There ARE certain mastics that are waterproof, but
> > a nice thinset (if using the home depot
> > stuff use the flexbond) worked great for me.
> >
> > Use the regular mastic on walls that arent going to get
> > water on it.
> >
> >
> > terphenyl@hotmail.com wrote:
> >> A few years ago some of the plumbing had to be replaced in the bathroom
> >> of the house I grew up in, and part of this was to remove some mosaic
> >> tiles that were put down about 1974 using a mastic. Man, getting those
> >> babies up was a great deal of hard work, and now that ceramic tile has
> >> entered a project of my own, I find everyone pushing thinset. Is it
> >> really better? If there were a bit of floor flex, wouldn't a plastic
> >> mastic tend not to crack as much as a thinset cement? And with a bit
> >> of mastic coming up between the tiles, wouldn't it keep water from the
> >> plywood (yes, right on the plwood!), rather than continuing to suck it
> >> down as a cement would after going through the grout?
> >> Now the floor was 3/4" diagonal T&G with 5/8" plywood, so perhaps
> >> flexing wasn't all that much a problem (I've forgotten the exact joist
> >> spacing & depth, but 2x10 16" OC seems to stick).
> >> Still, with all the effort needed to remove these tiles, why's
> >> everybody now down on plastic mastic?
> >
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