I live in a one year old new construction condo in arlington virginia.
It is a wood framed building. I have purchased 600 sq. ft. of
16x16x1/2inch limestone to install throughout. I found a gypsum based
floor beneath my carpet and it had dips in it. Builder came in and put
rapid set self-leveler from home depot down to help level it. I read
the bag and called the company who makes the leveler because it says
not to be installed over gypsum floors. Whole thing is cracking now and
seems to be cracking the gypsum floor beneath which was pristine
before. I am highly worried about the structure of my floor. Should it
be removed, left? should I install floating membrane for tile? Should i
be worried about serious damage? Andy

wrote:
I live in a one year old new construction condo in arlington virginia.
It is a wood framed building. I have purchased 600 sq. ft. of
16x16x1/2inch limestone to install throughout. I found a gypsum based
floor beneath my carpet and it had dips in it. Builder came in and put
rapid set self-leveler from home depot down to help level it. I read
the bag and called the company who makes the leveler because it says
not to be installed over gypsum floors. Whole thing is cracking now and
seems to be cracking the gypsum floor beneath which was pristine
before. I am highly worried about the structure of my floor. Should it
be removed, left? should I install floating membrane for tile? Should i
be worried about serious damage? Andy

You may be able to put a membrane down as long as the gypsum is not
unstable, but.....I really think you should contact your homeowners
ins. company as well as the builder. If the bag had directions not to
use the product over gypsum, than the builder is as fault and should do
whatever it takes to remedy the situation. Your homeowners insurance
company will normally help you figure out what needs to be done. Don't
settle with a band aid if surgery is called for.
Steve