Installation Guide
DESCRIPTION
4 to 1 is a preblended mixture of finely graded sand and Portland cement
used for thick-bed mortar installations. 4 to 1 flattens and levels an existing
substrate before the installation of tile and stone.
FEATURES AND BENEFITS
• Screed and level from 3/8" to 3" (10 mm to 7,5 cm)
• Ideal for floating shower bases
• Mix with water or Planicrete
®
AC
INDUSTRY STANDARDS AND APPROVAL
LEED v4 Points Contribution LEED Points
Health Product Declaration (HPD)* ..........................................Up to 2 points
* Using this product may help contribute to LEED certification of projects in the
category shown above. Points are awarded based on contributions of all project
materials.
Additional Green Certifications
• Living Building Challenge (LBC) Red List Free: This product has been
verified per the most current Red List on the LBC’s Website.
WHERE TO USE
• Floating shower bases
• Can be directly bonded or used as a detached floating mortar bed over
a cleavage membrane or waterproofing membrane
• For use in both residential and commercial applications in dry and wet
areas
• Mixes with water. For increased performance and reduced porosity, mix
with MAPEI’s Planicrete AC latex admixture.
LIMITATIO N S
• 4 to 1 can be mixed with water for most interior conditions. For better
performance or for exterior or heavy-duty wet areas, mix 4 to 1 with
Planicrete AC instead of with water. For details, see the Technical Data
Sheet for Planicrete AC.
• See ANSI A108.1 industry standard for details on mortar bed installations.
• For direct-bond applications, the concrete surface should have a profile
of CSP #3 to #5 or greater. The surface must be primed with a slurry
bond coat mixture (see “Mixing” section for details).
• Wood-frame structures must be designed to handle the loads of floating
mortar beds and tile assemblies. If the suitability of the structure is unclear,
consult a structural engineer or design consultant.
• For covering large areas, contact MAPEI’s Technical Services Department
for recommendations.
Consult MAPEI’s Technical Services Department for installation recommendations
regarding substrates and conditions not listed.
SUITABLE SUBSTRATES
• Cured concrete floors
Sand and Cement Mortar Mix
Mud Bed
Mi
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Mud Bed
Mi
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4 to 1
™
4 to 1
™
Version: Dec. 7, 2017