Installation Guide

DESCRIPTION
MAPEI SM Primer is a ready-to-use, fast-drying, water-based, latex primer for use under
MAPEI’s peel-and-stick sheet membranes on residential and commercial indoor or outdoor
floors. MAPEI SM Primer greatly increases the bond of MAPEI’s peel-and-stick sheet
membranes to concrete, plywood and other approved, properly prepared floors. It can be
applied with a roller or brush, is white in color and dries clear.
FEATURES AND BENEFITS
• Fully compatible with MAPEI’s peel-and-stick sheet membranes
• Easy to apply with roller or brush
• High coverage rate, for economical installation
• Fast-drying, allowing sheet membrane installation after about 15 minutes
• Dries clear, so that layout lines remain visible after application
• Bonds to a variety of substrates
INDUSTRY STANDARDS AND APPROVALS
LEED Points Contribution LEED Points
MR Credit 5, Regional Materials* ....................................................Up to 2 points
EEQ Credit 4.2, Low-Emitting Materials – Paints & Coatings .................... 1 point
IEQ Credit 4.3, Low-Emitting Materials – Flooring Systems ...................... 1 point
* Using this MAPEI product may help contribute to LEED certification of projects in the
categories shown above. Points are awarded based on contributions of all project materials.
WHERE TO USE
• MAPEI SM Primer is required when installing MAPEI’s peel-and-stick sheet membranes.
• For specic uses, see individual Technical Data Sheets (TDSs) for MAPEI peel-and-stick
sheet membranes.
LIMITATIONS
• Do not apply to substrates containing asbestos.
• Do not dilute with any other liquid.
• For specic limitations, see individual TDSs for MAPEI peel-and-stick sheet membranes.
• Not for use: over substrates subject to hydrostatic pressure or moisture content in excess
of 3 lbs. per 1,000 sq. ft. (1,36 kg per 92,9 m
2
) per 24 hours using a calcium chloride
test kit; over cracks subject to “out-of-plane” vertical movement; where oor movement
is greater than 3/8" (10 mm); over expansion or control joints; or in areas of prolonged
water immersion (such as swimming pools, spas, steam rooms, gang showers, hot tubs
and fountains).
SUITABLE SUBSTRATES
• Fully cured concrete (at least 28 days old)
• Cement mortar beds and indoor leveling coats
• Cement backer units (CBUs) – see manufacturer’s installation guidelines
• Properly prepared cement terrazzo oors, and well-bonded ceramic tile and natural stone;
and vinyl composition tile (VCT)
• Exterior-grade plywood for interior residential oors and countertops in dry areas only.
Plywood must be Group 1, CC-type, conforming to APA classication and U.S. Product
Standard PS 1-95 or COFI exterior plywood “Select” or “Select Tight Face” conforming
to CSA-0121 standard for Douglas r. (See TCA Handbook for additional information and
the statement regarding deection criteria.)
• For suitable substrates, see individual TDSs for MAPEI peel-and-stick sheet membranes.
Consult MAPEI’s Technical Services Department for installation recommendations regarding
substrates and conditions not listed.
Water-Based Primer for
MAPEI Peel-and-Stick
Membranes
SM Prime
r
™
MAPEI MAPEI
SM Primer
™
TM
Version: April 4, 2011