Part 3. Preparation for Concrete Floor Coverings

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3.1 Removal of curing compound.
Give instructions on curing-compound removal, or refer the owner to the manufacturer of the curing compound (include the manufacturers address and telephone and fax numbers).

3.2 Drying time.
Tell the owner that installers of moisture-sensitive floor coverings or coatings usually require floors to reach a water-vapor emission rate of 3 to 5 pounds per 1,000 square feet per 24 hours. As stated in section 2.1, however, floors dry slowly. Depending on the floor design, concrete properties and drying conditions, the time needed to reach required emission rates can range from a few to several months. Report test results for water-vapor emission, including the date of the test reading.

3.3 Surface pH.
Flooring installers may also require a minimum pH for the concrete floor surface. Concrete generally has a pH of 11 to 12. As the floor surface reacts with atmospheric carbon dioxide, the pH decreases but seldom falls below 9. Thus, a surface pH requirement below 9 may not be attainable, even though some flooring installers require a lower pH. Report test results for pH, including the date of the test reading.

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