It can't be overstated...remove the word 'smooth' from the specifications when describing acceptable concrete surfaces for toppings and or floor coverings
It can't be overstated. Remove the word 'smooth' from the specifications when describing acceptable concrete surfaces for toppings and or floor coverings, and replace with: 'Provide a Concrete Surface Profile (CSP) of 3 prior to placement of Hydraulic Cement Underlayment (HCU), or a CSP of 2 prior to installation of floor coverings, or as required by the manufacturer of the scheduled topping or floor covering product'. Power Trowels have their place but must be managed so that they don't over do it! Overdoing it creates a multitude of problems including an overly smooth, dense surface which prevents moisture vapour from escaping which significantly slows the drying process. Excessive power towelling also removes surface porosity, required for adhesive bond, which in turn can force the need for shot blasting or grinding which wastes time and money, and doesn't necessarily solve the issues. www.nfca.ca
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