- Flexes to prevent cracks in porcelain and ceramic tile
- Excellent bond strength and flexibility up to 1/16"
- Outstanding bond to glass, metal and other decorative tile
Suitable Tile Types
- Vitreous, semi-vitreous and absorptive tile: ceramic, mosaic, quarry, cement body tile
- Impervious glass and porcelain tile
- Natural stone
- Cement-based precast terrazzo
- Thin brick
- Concrete, mortar beds, masonry, Portland cement plaster
- Liquid applied waterproofing membranes such as RedGard® and Custom® 9240
- Crack prevention sheet membranes such as Crack Buster® Pro
- Exterior Grade Plywood (interior residential and light commercial dry areas)
- Gypsum wallboard (interior dry areas)
- Existing ceramic tile (scarified)
- Fully-bonded sheet vinyl flooring (scarified)
- Plastic laminates (scarified)
- Cutback adhesive (see preparation instructions)
Composition & Materials
FlexBond® Crack Prevention Mortar is a dry, proprietary blend of Portland cement, copolymers, inorganic aggregates and chemicals
- Outstanding flexibility and bond strength for difficult substrate and tile applications
- Protects against cracking caused by minor in-plane surface movement
- Isolates cracks to 1/16" (1.6 mm) and can be applied over cracks to 1/16" (1.6 mm) without additional preparation
- Exceeds ANSI A118.4, A118.15 and A118.11 standards without the need for additives
- Approved for industry-recommended interior and exterior applications
- Do not bond directly to hardwood, Luan plywood, particle board, parquet, cushion or sponge-back vinyl flooring, metal, fiberglass, plastic or OSB panels.
- When setting moisture sensitive natural stone, cement or agglomerate tile use EBM-Lite™ Epoxy Bonding Mortar 100% Solids or CEG-Lite™ 100% Solids Commercial Epoxy Grout.
- Do not use to install resin-backed stone; use EBM-Lite™ Epoxy Bonding Mortar 100% Solids, CEG-Lite™ 100% Solids Commercial Epoxy Grout or contact Custom's® Technical Services for recommendations.
- For clear or translucent glass, CUSTOM recommends Glass Tile Premium Thin-Set Mortar. When setting glass tile larger than 6" x 6" (15 x 15 cm), contact Custom's® Technical Services for recommendations.
- When setting dimensional stone larger than 12" x 12" (30 x 30 cm), contact Custom's® Technical Services for recommendations regarding subfloor deflection requirements.
- 50 lb (22.68 kg) and 25 lb (11.34 kg) bags
- Gray or white
American National Standards Institute (ANSI) — ANSI A108.5, A118.4, A118.15 and A118.11 of the American National Standards for the Installation of Ceramic Tile ASTM International (ASTM)
- ASTM C109 Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in or [50-mm] Cube Specimens)
- ASTM C627 Standard Test Method for Evaluating Ceramic Floor Tile Installation Systems Using the Robinson-Type Floor Tester
- Resilient Floor Covering Institute - (RFCI) Recommended Work Practices for Removal of Resilient Floor Coverings
- Tile Council of North America (TCNA) - TCNA Handbook for Ceramic Tile Installation, TCNA Method EJ171
- ISO 13007-2
Technical Data Sheet
Technical Data Sheet - French
Technical Data Sheet - Spanish
Material Safety Data Sheet - English
Material Safety Data Sheet - French
Custom® Building Products warrants to the original consumer purchaser that its product shall be free from defects in material and workmanship under normal and proper usage for a period of one year following the date of original purchase. Custom's® sole liability under this warranty shall be limited to the replacement of the product. Some states, countries or territories do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty will not extend to any product which has been modified in any way or which has not been used in accordance with Custom's® printed instructions. Custom® makes no other warranties either expressed or implied. This warranty gives you specific legal rights, and you may have other rights that vary from state to state or from one country/territory to another. This warranty is not transferrable.
When FlexBond® Crack Prevention Mortar is used as a part of a qualifying full installation system of CUSTOM products, the installation can qualify for up to a lifetime system warranty. CUSTOM will repair and/or replace, at its discretion, the affected area of the system. For more information, find details and limitations to this warranty at custombuildingproducts.com.