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Re: Slab floor damage

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This appears to be the case of buckling of ceramic tiles exposed to moisture on their unprotected (bottom) side. If installed improperly (which is almost always the case), the tiles expand and, if installed without joints, will buckle.  The neat thing about that kind of damage is that usually there is no damage of the underlying slab - cracking, staining, etc.
You may want to consult Ceramic Tile Institute - they've been very helpful for many years.
Steve Gordin SE
Irvine CA    
----- Original Message -----
Sent: Thursday, June 22, 2006 1:06 PM
Subject: Slab floor damage

40-year old single story house w/ 4" slab-on-grade foundation/floor, most likely cut and fill pad, water seepage in nearby street but not under house, trees in side yards. Floor tiles cracked (tight cracks) and buckled approximately 1-inch high near the edge of the floor (but not at the edge) in a 5-foot line perpendicular to cut/fill line and to base of slope. No damage to plaster walls, ceilings. Moderate temperatures (Los Angeles). No recent shaking (construction, earthquakes). Wha’s up?

Charles Laine, S.E.

Long Beach, CA