LATICRETE INTERNATIONAL, INC.
1 LATICRETE Park North
Bethany, CT 06524-3423 USA
Tel: (203) 393-0010
Toll-Free: (800) 243-4788
Fax: (203) 393-1684
E-mail: technicalservices@laticrete.com
Web site: http://www.laticrete.com


LATICRETE^® 125 Sound & Crack Adhesive

PRODUCT DESCRIPTION

LATICRETE 125 Sound & Crack Adhesive is a superior crack prevention and sound isolation adhesive mortar. Independently tested to ANSI A118.12 specification for crack isolation for ceramic tile and stone installations and independently tested to ASTM E2179 and ASTM E492 for sound protection. LATICRETE 125 Sound & Crack Adhesive is a two component adhesive mortar which takes the place of costly time consuming membrane or mat systems by allowing for faster more effective tile or stone installations.

• Prevents transmission of cracks from the approved substrates to the tile or stone finish when subjected to horizontal in plane movement of cracks up to 1/8" (3 mm) under normal usage. Exceeds ANSI A118.12
• ΔIIC rating of 15 as tested to ASTM 2179
• Rated "EXTRA HEAVY" per Robinson ASTM C627
• Thin-bed or medium-bed applications
• Superior workability—equipped with lightweight technology
• GREENGUARD certified, LEED compliant
• Reinforced with Kevlar^®
• Equipped with Microban^®
• Interior installations only
• Part of the 25 Year Warranty^†

• Concrete
• Cement mortar beds
• Ceramic tile and stone
• Exterior glue plywood
• Brick masonry
• Cement terrazzo
• Cement backer board*
• Poured gypsum underlayments

7 gallon pail kit (26.5 l)

Content: 2.5 gal (9.5 l) LATICRETE 125 Sound & Crack Adhesive Additive and 27.5 lbs (12.5 kgs) LATICRETE 125 Sound & Crack Adhesive powder

36 pails per pallet

Grey only

Factory sealed containers of this product are guaranteed to be of first quality for one (1) year if stored off the ground in a dry area.

• Not for use directly over particle board, luan, Masonite^® or hardwood floors.
• Use LATAPOXY^® 300 Adhesive for installing green marble, moisture sensitive stone, resin backed stone or tile, and agglomerates. (refer to Data Sheet 633.0)
• Adhesives/mastics, mortars and grouts for ceramic tile, pavers, brick and stone are not replacements for waterproofing membranes. When a waterproofing membrane is required, use a LATICRETE^® Waterproofing Membrane (see Section 10 FILING SYSTEMS).
• Note: Surfaces must be structurally sound, stable and rigid enough to support ceramic/stone tile, thin brick and similar finishes. Substrate deflection under all live, dead and impact loads, including concentrated loads, must not exceed L/360 for thin bed ceramic tile/brick installations or L/480 for thin bed stone installations where L=span length.

Consult MSDS for more safety information.

• During cold weather, protect finished work from traffic until fully cured.
• Contains silica sand. May irritate eyes and skin. Avoid contact with eyes or prolonged contact with skin. In case of contact, flush thoroughly with water.
• Do not take internally. Silica sand may cause cancer or serious lung problems. Avoid breathing dust. Wear a respirator in dusty areas.
• Do not allow product to freeze during transportation, storage or installation until product is fully cured.
• Keep out of reach of children.

Physical Properties

Working Properties

Identify the type of crack in the substrate. DO NOT use LATICRETE 125 Sound & Crack Adhesive over structural cracks or other areas with differential vertical movement.

Shrinkage Cracks: Occur during the curing process of the concrete. Typically the movement is horizontal (open and close).

Structural Cracks: Occur from improper design or installations of substructure for load conditions. Typical movement is vertical (up and down). LATICRETE 125 Sound & Crack Adhesive is not intended to bridge joints which experience dynamic movement such as expansion joints and structural cracks. Expansion joints must be carried through the entire tile installation.

NOTE: Treat closest joint to cold or saw cut joint with LATICRETE Latasil. Do not remove all of LATICRETE 125 Sound & Crack Adhesive from the grout joints in areas that are treating non-structural cracks, cold joints, saw cut joints.

However, LATICRETE 125 Sound & Crack Adhesive must be removed from all other movement joints while fresh to allow for maximum movement these joints. Fill these joints completely with LATICRETE Latasil and the appropriate backer rod or bond breaker tape.

All surfaces should be between 50°F (10°C) and 90°F (32°C) and structurally sound, clean and free of all dirt, oil, grease, paint, concrete sealers or curing compounds. Rough or uneven concrete surfaces should be made smooth with LATICRETE Latex Portland Cement Underlayment to provide a wood float (or better) finish. Dry, dusty concrete slabs or masonry should be dampened and excess water swept off. Installation may be made on a damp surface. New concrete slabs shall be damp cured and 28 days old before application. All slabs must be plumb and true to within 1/4" (6 mm) in 10 ft (3 m). Expansion joints shall be provided through the tile work from all construction or expansion joints in the substrate. Follow ANSI specification A108.01-3.7 "Requirements for Movement Joints: Preparations by Other Trades" or TCNA detail EJ-171 "Movement Joints—Vertical & Horizontal". Do not cover expansion joints with mortar.

Maximum amount of moisture in the concrete substrate should not exceed 5 lbs/1000 ft² (2.26 kg/92.9 m²) /24 hours per ASTM F-1869 or 75% relative humidity as measured with moisture probes.

1. Installer must verify that deflection under all live, dead and impact loads of interior plywood floors does not exceed industry standards of L/360 for ceramic tile and brick or L/480 for stone installations where L=span length.
2. Minimum construction for interior plywood floors.
   SUBFLOOR: 5/8" (15 mm) thick exterior glue plywood, either plain with all sheet edges blocked or tongue and groove over bridged joists spaced 16" (400 mm) o.c. maximum; fasten plywood 6" (150 mm) o.c. along sheet ends and 8" (200 mm) o.c. along intermediate supports with 8d ring-shank, coated or hot dip galvanized nails (or screws); allow 1/8" (3 mm) between sheet ends and 1/4" (6 mm) between sheets edges; all sheet ends must be supported by a framing member; glue sheets to joints with construction adhesive.
   UNDERLAYMENT: 5/8" (15 mm) thick exterior glue plywood fastened 6" (150 mm) o.c. along sheet ends and 8" (200 mm) o.c. in the panel field (both directions) with 8d ring-shank, coated or hot dip galvanized nails (or screws); allow 1/8" (3 mm) to 1/4" (6 mm) between sheets and 1/4" (6 mm) between sheet edges and any abutting surfaces; offset underlayment joists from joists in subfloor and stagger joints between sheet ends; glue underlayment to subfloor with construction adhesive. Refer to Technical Data Sheet 152 "Bonding Ceramic Tile, Stone or Brick Over Wood Floors" for complete details.
3. DO NOT bond to particle board, luan, Masonite or hardwood surfaces.

Remove container of Latex and Powder from the LATICRETE^® 125 Sound & Crack Adhesive pail. Add the entire content of the Latex container into the pail. Add the 27.5 lbs (12.5 kg) of powder. Mix with a slow speed mixer to a smooth, trowelable consistency. Allow mortar to slake for 5–10 minutes. Remix without adding any more latex or powder. During use, stir occasionally to keep mix fluffy. DO NOT temper with water.

It is essential that all walls and building elements are isolated from the floor.

Note: It is recommended to install a perimeter isolation strip before the installation of LATICRETE 125 Sound and Crack Adhesive. Attach the perimeter isolation strip to the perimeter wall of the entire subfloor, as well as around the perimeter of any protrusions, in order to isolate or break the vibration transmission path between the floor and the wall. Temporarily fasten perimeter isolation strip in place with staples masking, duct, or carpet tape. The perimeter isolation strip can then be removed after the tiles have set firm. The joints can then be filled with an appropriate acoustical sealant.

Apply mortar to the substrate with the flat side of the trowel, pressing firmly to work into surface. Comb an additional mortar with the notched side.

Note: To obtain stated sound control rating, tile must be back-buttered.

Note: Use the proper sized notched trowel to ensure full bedding of the tile. Nominal thickness using 1/4" x 3/8" (6 mm x 9 mm) towel and back-buttering tile for sound abatement is 1/8" to 3/16". Spread as much mortar as can be covered with tile in 15–20 minutes. Place tiles into wet, sticky mortar and adjust. Check mortar for complete coverage by periodically removing a tile and inspecting bedding mortar transfer onto back of tile. If mortar is skinned over (not sticky), remove and replace with fresh mortar. For installations requiring sound control; all tiles must be back buttered.

Clean tools and tile work with water while mortar is fresh.

LATICRETE and LATAPOXY materials are available worldwide.

For Distributor information:
Toll Free: 1.800.243.4788
Telephone: +1.203.393.0010

For on-line distributor information, visit LATICRETE at www.laticrete.com.

Contact a LATICRETE Distributor in your area.

LATICRETE and LATAPOXY^® grouts require routine cleaning with a neutral pH soap and water. All other LATICRETE and LATAPOXY materials require no maintenance but installation performance and durability may depend on properly maintaining products supplied by other manufacturers.

Information is available by calling
Toll Free: 1.800.243.4788, ext. 235
Telephone: +1.203.393.0010, ext. 235
Fax: +1.203.393.1948

To acquire technical and safety literature, please visit our website at www.laticrete.com.