Pouring Concrete Is Easy, But Requires Proper Preparation
If you are pouring a concrete slab for a building foundation, even small leveling variations can cause wall construction to need shimming or trimming during framing. Therefore... keep everything level.
If you intend to cover the slab with vinyl flooring, make sure the concrete mix isn't too permeable, thereby allowing moisture to collect beneath the flooring.
Control joints allow the concrete to crack exactly where you want it to. If the slab is on landfill, or just above the water table, the weight of the slab itself might cause it to crack.
Wire mesh and rebar ties need to be supported above the subfoundation, so that the metal is completely encased in concrete. This not only strengthens the slab, it also prevents the rebar from rusting.
Make sure the subgrade is tamped down, dampened and compacted, so there are no collapses beneath the slab, resulting in concrete with little support.
Concrete takes some time to cure properly; therefore, keep it moist for at least one week and it will make the slab substantially stronger and resistant to cracking.
If the ground around your home is always wet, consider a waterproof polyethylene membrane placed atop the subfoundation gravel as a vapor barrier.
Check first to see whether you need a building permit... as well what building codes are applicable in your neighborhood. Generally, a simple patio or walkway pour does not need a permit. However, a slab that will have a building on top certainly will require a permit because the job requires deeper and stronger footings.
Hot sunny days make concrete set up quickly. Time your pouring so it takes place during early morning or late afternoon. Be sure to wear protective grea and keep raw concrete away from bare skin. This stuff causes severe burns.
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