Concrete floor installation in Garden Grove CA - a flat slab ready for your flooring

A reinforced concrete slab in Orange County usually costs about $8 to $14 per square foot before any staining or stamping, going by a contractor-matching site's county figures. An unreinforced pad runs a little less per square foot. Where your job lands depends on the size, the thickness and the prep, and your written estimate shows each part.

You should be able to walk on a new slab within 48 hours, and it's smart to wait about a week before moving heavy things onto it. Full curing, the slow hardening that keeps going after the surface feels set, takes about a month, so the room is usable within days while the slab keeps gaining strength for weeks.

Yes, a few random cracks are normal, and the national floor guide says some should always be expected, even when the slab is cut into panels with joints close together. The joints we cut keep most cracking on lines we chose. Extra water in the mix also makes concrete shrink more as it dries, so we don't thin the mix just to make it easier to spread.

A vapor retarder, a moisture barrier laid under the slab, gives floor coverings and coatings the most protection when it sits right against the concrete, according to the national floor guide. The same guide says plain plastic sheeting, the kind used under slabs in the past, falls short, so ask any bidder what material goes under your floor and where it sits.

Have it checked before you plan around it, because garage slabs in many older Orange County homes are thin and have no vapor retarder, and plan checkers look closely at that in a conversion. House floor slabs here typically run four to six inches thick, with garage slabs at the thicker end. I'll look at yours at the estimate and tell you straight whether a repair will do or the slab should come out.

You apply through the City of Garden Grove's permits page, which takes new residential, commercial, engineering and other permit applications, and it's the place to ask whether your floor needs one. State law also has cities use mapped liquefaction zones, areas where loose, wet ground can go soft in a strong quake, when they issue construction permits. You can look up your address on the state's EQ Zapp map to see if it's in a mapped zone or hasn't been evaluated yet, and bring what you find to the estimate.