LIMITATIONS
Do not use 7d10 Multi Purpose Thin Set below 40ºF (4ºC) or
above 95ºF (35ºC). Use caution; do not allow mortar to freeze
for the first 72 hours. Do not soak tiles previous to installation.
7d10 Multi Purpose Thin Set must not be used to apply over asphalt sheeting,
vinyl covered wall board, Masonite®, cement asbestos board, metal,
glass, plastic, or other unstable substrates. Improperly cured or wet
plywood, particle board or strip wood are not suitable substrates. Installations
that will be continually wet like swimming pools, fountains and gang
showers, the completed installation should be cured a minimum of 14
days and allowed to dry before exposure to water. For white or light
colored marbles use 7d10 Multi Purpose Thin Set White mortar. Some dimensional
stone tile like green and red marbles may warp when installed with water
based setting materials. These water sensitive stone tiles should be
installed with Mer- Krete ProEpoxy. For use of 7d10 Multi Purpose Thin
Set over additional substrates or situations not mentioned in these
instructions, contact Mer-Krete’s Technical department.
TECHNICAL DATA
APPLICABLE STANDARDS
Mer-Krete’s 7d10 Multi Purpose Thin Set meets
or exceeds industry requirements ANSI A118.4 for Latex Portland Cement
Mortar and 118.11 for EGP Latex Portland Cement Mortar. Follow ANSI
A108.5 for installation.
INSTALLATION
SURFACE PREPARATION
All surfaces must be between 40ºF (4ºC) to 95ºF (35ºC)
and structurally sound (deflection not to exceed 1/360 of the span),
dry clean and free from oil, grease, wax, paint, old adhesives, sealers
and curing compounds. Any contaminates which inhibit proper bond must
be removed. Substrate preparation should be completed following ANSI
A108.01 (General Requirements: Subsurfaces and Preparation by Other
Trades). All substrates should be plumb and true, surface deviation
should not exceed 1/4" in 10'. Patching, leveling or areas requiring
a mortar bed should be prepared using Mer-Krete’s Underlayments.
Movement (Expansion) joints should be provided to comply with TCA method
EJ 171.
Plywood Substrates
Maximum joist spacing should be 16" on center. Plywood should be
exterior grade only. Maintain a gap of 3/16" between plywood underlayment
sheets edges and all that abut walls, columns, posts and adjacent sheets.
All plywood installations should be use in interior areas only and protected
from exposure to moisture.
Cementitious Substrates
All concrete substrates should be cured a minimum of 28 days. Smooth
steel troweled floors should be roughed up using mechanical chipping,
scraping or shot blasting. Dampen porous or dry concrete previous to
installation of tile. Do not leave puddles or standing water.
Cement Backer Board
Follow cement board manufacturer’s instructions.
MIXING
In a clean container, add approximately 5 quarts (4.7 liters) of clean
potable water. Then add the contents of the 50 lb. (22.7 kg) 7d10 Multi
Purpose Thin Set mortar. Mix thoroughly by hand or with a slow speed
mixer to a smooth, thick, trowelable consistency. Allow mortar to slake
for approximately 15 minutes, and then remix before using. Remix without
adding additional water or powder. Mortar consistency shall be such
that when applied with the recommended notched trowel to the substrate,
the ridges formed in the mortar do not flow or slump. During use, stir
mortar mix occasionally. Do not temper with additional water. Do not
add latex liquid to 7d10 Multi Purpose Thin Set.
APPLICATION
Apply mortar to the substrate with the flat side of the trowel, with
enough pressure to firmly work into the surface. With a notched trowel,
immediately follow with a heavier coat of material using the appropriate
trowel and enough mortar to provide 100% coverage to the back of the
tile. Some extruded or lug back tiles back-buttering of tiles may be
required. Do not spread more mortar then can be covered in 20 minutes
or before the mortar skins over. It is advised that during the installation,
remove a tile to insure the mortar has not skinned over and check the
tile and substrate mortar coverage. Comb the mortar using an appropriate
notched trowel in one direction. Place tiles in mortar, slide back and
forth perpendicular to the ridges (NTCA “Trowel and Error”
method) to insure proper coverage. Do not adjust tiles set in mortar
after 15 minutes.
CLEANING
Water is all that is needed to remove any uncured mortar from tiles,
tools and equipment.
AVAILABILITY
Mer-Krete 7d10 Multi Purpose Thin Set is available
at leading tile houses and construction distributors. Contact Mer-Krete
for the name of the nearest dealer.
WARRANTY
5 year, 10 year and Limited Lifetime warranties are available. Contact
Mer-Krete technical department for specific warranty information. Mer-Krete
Systems warrants that this product meets applicable ANSI standards in
force at the time of manufacture.
MAINTENANCE
None required, but installation performance and durability may depend
on properly maintaining products supplied by other manufacturers.
TECHNICAL SERVICES
Mer-Krete Systems maintains technical field representatives available
throughout the country. Call (800) 851-6303 for the nearest representative.
FILING SYSTEMS
Mer-Krete Architectural Product Catalog and CD Rom. www.merkrete.com
