Schluter®-KERDI-FLEX

Function

Schluter®-KERDI-FLEX is a flexible polyethylene waterproofing strip used to seal movement joints over Schluter®-DITRA in specialty applications where large movements are expected, i.e. over expansion joints or construction joints.

Installation

Installation with Schluter®-KERDI and Schluter®-KERDI-DS KERDI and KERDI-DS shall be separated at existing expansion, structural, and flexible edge joints. Cover the joints with KERDI-FLEX using Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar. To allow for greater movement, the center section of the KERDI-FLEX can be tucked into the cavity of the expansion joint prior to bonding. Connections to fixed building elements can be achieved by using KERDI-FLEX in conjunction with KERDI-FIX, suitable trowel-applied waterproofing materials (such as urethane or similar), that require atmospheric moisture to cure, or other suitable sealing compounds. KERDI shall be separated at existing expansion, structural, and flexible edge joints. Cover the joints with KERDI-FLEX. To allow for greater movement, the center section of the KERDI-FLEX can be tucked into the cavity of the expansion joint prior to bonding.Once the entire membrane—with seams, corners, and connections—has been completely bonded, and therefore waterproofed, the covering may be applied.

Installation with Schluter uncoupling membranes 1. At the joints, fill the cut-back cavities with Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar, approximately 8″ (203 mm) wide, centered over the joint. 2. Comb additional Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar over the joint using a 1/4″ x 3/16″ (6 mm x 5 mm) V-notched trowel or the Schluter®-KERDI trowel, which features a 1/8″ x 1/8″ (3 mm x 3 mm) square-notched design. 3. Apply 5″ (127 mm)-wide Schluter®-KERDI-BAND or Schluter®-KERDI-FLEX, centered over the joint. Using the flat side of the trowel, firmly press the banding into the mortar to ensure 100% coverage and to remove excess mortar and air pockets. 4. At all wall junctions, apply KERDI-BAND or KERDI-FLEX as described in steps 1-3, ensuring a minimum of 2″ overlap on to the uncoupling membranes.

Notes KERDI-BAND and KERDI-FLEX must lap the uncoupling membranes at seams and at floor/wall transitions by a minimum of 2″ (50 mm) in order to maintain waterproof integrity. In some applications the vertical section of the floor/wall transition will not accept a bond to Schluter-SET, Schluter-ALL-SET, Schluter-FAST-SET, or unmodified thin-set mortar. Connections to such elements can be achieved using Schluter®-KERDI-FIX or suitable trowel-applied waterproofing materials, such as those that require atmospheric moisture to cure (e.g., urethane sealant).