PREPARATION

SURFACE PREPARATION
All existing surfaces that are to receive tile must be clean, sound, solid, and free of weak or loose areas, dust, dirt, oil, or any contaminant that may act as a bond breaker. The plane of wall surfaces must be plumb and true. Floor surfaces must have minimal variation in the plane or the slope. Should pre-leveling on an interior floor be required, use HENRY 547 Universal Underlayment. Tiling with HENRY 316 MarbleFlex Fast-Setting Thinset Mortar may proceed in 16 hours. Expansion joints must be provided over existing moving joints and where substrate materials change composition or direction.

PRIMING:
Standard absorbent substrates such as concrete require no priming prior to installing the tile. For applications over nonabsorbent substrates such as metal, glass, solidly bonded non-porous coatings, and existing tiles, prime with HENRY Floor Primer and allow to dry thoroughly (min. 3 hours, max. 24 hours) prior to beginning the installation.

MIXING:
The standard mixing ratio is 1.5 qt. of water per 12.5 lb. box. Put clean water in the mixing container first, then add the HENRY 316 MarbleFlex Fast-Setting Thinset Mortar powder. For mixing smaller amounts, use a mixing ratio of 2 3/4 parts powder to one part water by volume. For best results, mix with the mixing paddle and 1/2” heavy-duty drill. To mix by
hand, use a margin trowel and mix vigorously for 2-3 minutes. Just prior to application on the substrate, the mixture should be stirred again to ensure a creamy, smooth and lump free consistency. NO SLAKE TIME IS REQUIRED!
NOTE: The pot life of HENRY 316 MarbleFlex Fast-Setting Thinset Mortar is 30 minutes at 70°F. If surface skinning occurs within this time, stir material again before using. DO NOT ADD MORE WATER!

INSTALLATION
After mixing, apply a thin scratch coat of the mortar to the substrate with the flat side of a trowel to obtain a solid mechanical bond. Apply to an area no greater than that which can be covered with tile while the mortar remains plastic (approx. minutes 10 working time, depending on the substrate and job site conditions). Comb the mortar with a notched trowel to sufficient depth to ensure that the tiles are covered uniformly over their entire surface. The type and size of the tiles will dictate the size of the notched trowel to be used. The position of the tiles may be corrected for approximately 10 minutes after their installation. Rough or uneven substrates may first be treated with a full scratch coat of HENRY 316 MarbleFlex. Installation of tiles may begin after the scratch coat has hardened.

BACK-BUTTERING:
When setting tiles, it may be necessary to trowel a layer of mortar on the back of each tile prior to placing on the combed mortar bed in order to achieve the required mortar-to-tile contact specified. Press tile firmly into the freshly combed mortar to ensure maximum mortar contact with tile. Tile must not be applied to skinned-over mortar.

GROUTING:
Tiles may be grouted after 2 hours. HENRY recommends the use of HENRY MarbleFlex Grout to prevent staining of marble and natural stone.

Application	Recommended Trowel	Coverage
For setting floor and wall tile UP TO 12"x12"	1/4”x1/4”x1/4” square notched trowel	19-22 sq. ft. 12.5 lb box
Application	Recommended Trowel	Coverage
For setting floor and wall tile OVER 12"x12"	1/4”x3/8”x1/4” square notched trowel	16-19 sq. ft. 12.5 lb box

CLEANUP:
Use clean, damp cloth for clean up. If material dries, use mechanical means to remove.

WARRANTY:
For complete warranty details, contact your dealer or our Customer Service Center at 800-232-4832. We warrant that HENRY 316 MarbleFlex Fast-Setting Thinset Mortar will not break down or lose its cohesive strength due to a manufacturing or formulation defect for one year from the date of purchase, subject to certain exclusions and limitations set forth in the warranty, if used for that stated purpose and applied in accordance to these instructions.

Read label and Material Safety Data Sheet carefully before use.