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- 1). Mix the concrete according to the manufacturer's directions. Be careful not to add more water than the directions require, as too much water weakens the concrete and can make it take longer to dry.
- 2). Place a 6-mil polyethylene plastic sheet on the ground where you plan to pour the concrete slab to act as a vapor barrier. Another option is to place a vapor retarder membrane on the surface before you pour the concrete.
- 3). Add a subgrade layer of gravel for proper water drainage.
- 4). Cure the concrete by covering the slab with 6 mil. plastic for five to seven days. During this time, water rises to the top and evaporates; however, you need water to harden the concrete. Hydrate the concrete by spraying or misting it with water each day. When the temperature is below 40 degrees F, you need to keep the concrete moist with concrete insulation blankets or straw before putting down the plastic. When temperatures exceed 90 degrees F, it is important to ensure the surface is moist, as the water can evaporate too quickly, which can affect the curing process.
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