*Interior Use Only
** Consult cement backer board manufacturer for installation recommendations and to verify acceptability for exterior use.

LIMITATIONS
Do not use 705 ProSet Plus 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. 705 ProSet Plus
must not be used to apply over asphalt sheeting, vinyl covered wall board, Masonite®, cement
asbestos board, metal, glass, plastic, gypsum mortar beds 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 705 ProSet Plus 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 705 ProSet Plus over additional substrates or situations not mentioned
in these instructions, contact Mer-Krete Technical department.

TECHNICAL DATA

APPLICABLE STANDARDS
Mer-Krete’s 705 ProSet Plus meets or exceeds industry requirements ANSI A118.4 for Latex Portland Cement Mortar and ANSI A118.11 for EPG Latex Portland Cement Mortar. Follow ANSI A108.5 for installation.

INSTALLATION

SURFACE PREPARATION
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 AN-2 “General Requirements for
Subsurfaces”. 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 (EGP) 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 interior areas only and
protected from exposure to moisture.

Cement 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) 705 ProSet Plus 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 705 ProSet Plus.

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.

AVAILABILITY

Mer-Krete 705 ProSet Plus 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

TECHNICAL ASSISTANCE:
Specification assistance is highly recommended prior to a proposed installation.
Contact any Mer-Krete technical representative for recommendations over existing substrates or problem areas.