Surface Preparation
• All substrates must be structurally sound, dry, solid and
stable.
• Substrate should be clean and free of dust, dirt, oil,
grease, paint, curing agents, concrete sealers, loosely
bonded toppings, loose particles, old adhesive residues,
and any other substance or condition that may prevent or
reduce adhesion.
• Substrates must be flat to 3/16" in a 10-ft. span
(4,5 mm in a 3-meter span). Refer to wood-flooring
manufacturer’s guidelines.
• Concrete and cement-based underlayments and patches
must be fully cured and free of any hydrostatic and/or
moisture problems.
• Use anhydrous calcium chloride tests to determine
MVER according to ASTM F1869.
• Concrete slabs exceeding 3 lbs. (1,36 kg) in MVER
should be treated with a moisture vapor reduction
product. Refer to Technical Data Sheets at www.mapei.
com for information on these products.
• Use a moisture meter to check the relative humidity of
the wood flooring, substrate surface and general jobsite
area. Follow the flooring manufacturer’s guidelines.
• Refer to MAPEI’s Surface Preparation Requirements
document for floor-covering installation systems at
www.mapei.com.