All FIRM-FILL Gypsum Underlayments are quick drying and offer a flat, durable surface for finished floor coverings. They meet ASTM F2419 Standard Practice for the Installation of Thick Poured Gypsum Concrete Underlayments. Each Apex employee is a trained Licensed Applicator of FIRM-FILL SCM and FIRM-FILL Gypsum Concrete Underlayment.
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