what type of tile ?

ceramic or resilient tile ?

is there a dead airspace under the slab or is it on grade / on the ground ?

do you have any moisture problems, and if not, what caused the tiles to crack if you know ?

is there every any musty smells or mold growth in the area ?

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There are two ways to do any job. The right way and the wrong way. Do it right everytime.

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http://flooringworld.org/

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We broke the tile as we put it down from seven inch squares. No moisture and there is a low crawl space under the concrete slab where the tile is and no smell. Carpet is on slab probably on ground (new edition 10 yrs ago) but no problems . Just want to change interior and put something that is easy to clean.

I would take up all flooring and scrape any adhesives with razor scapers available at your local big box home improvements store, else you would have varrying floor heights to contend with, and laminate can not be installed on carpeting.

clean everything up and sweep or shop vac.

ensure the floor isnt too wavy beyond manufacturers height tolerances by laying down a level in various locations in the area to see of there are any hih or low spots(for pergo brand its no more than 1/8" in 6 feet approx.)

for added insurance I would do a calcium chloride moisture test, and it all is well, and install a polyethelene (sheet plastic) overlapping the seems by 4"-6". (Max relative humidity for isntallation is 75%)

follow manufacturers installtion instructions to the letter and use recommended products.

_____________________________________________

There are two ways to do any job. The right way and the wrong way. Do it right everytime.

_____________________________________________

http://flooringworld.org/

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here is a link to information about moisture testing and calcium chloride testing

http://flooringworld.org/floorsearch.php?query=calcium+chloride+moisture+test

_____________________________________________

There are two ways to do any job. The right way and the wrong way. Do it right everytime.

_____________________________________________

http://flooringworld.org/

_____________________________________________