Installation Instructions

To seal between the drain and the underside of the membrane Apply 2 beads of Urethane sealant

or MS Polymer sealant separated 2'' in concentric circles around the drain hole opening and a

third drop interposed there between in a zigzagged pattern.

Install the WATER-STOP membrane. Apply pressure to the membrane with the flat side of the

trowel squeezing the sealant toward the drain hole and the thin-set mortar outward toward the

sheet edges or the perimeter of the shower.

When you are ready to install the drain assembly, cut an X in the membrane toward the edges

of the drain hole to insert drain height adjustment sleeve.

3.3.2. Penetrations

Treat pipe penetrations and mixing valves with W-S TUBO (Figure 3):

Apply thin-set mortar with notched trowel on the substrate around the penetration.

Apply a bead of Urethane sealant or MS Polymer sealant over the pipe or mixing valve, slide the

W-S TUBO flashing collar over and press firmly into the thin-set. Remove any trapped air and

guarantee full adhesion to the material by spreading the thin-set from the inside out using a

trowel.

3.3.3. Expansion Joints

It is the installer’s responsibility to follow the architectural specifications (based on TCNA Handbook

section EJ171). WATER-STOP membrane shall be separated at existing expansion and structural

joints (Figure 6)

Apply thin-set mortar with notched trowel on the substrate on both sides along the joint

Cover the joint with BANDA W-S 34. To allow for greater movement, the center section of the

BANDA can be tucked into the cavity of the expansion joint prior to bonding.

Embed the BANDA into bond coat. Remove any trapped air and guarantee full adhesion to the

material by pressing firmly with the flat side of the trowel in diagonal sweeps.

When installing the main area WATER-STOP membrane must be joined to the BANDA. Seams

must be made by overlapping the edges of the WATER-STOP adjacent sheets 2-3" (5-8 cm)

using Urethane sealant, MS Polymer sealant or a latex modified dry-set cement mortar conform

to ANSI A118.4

Finally cover the seams applying a second BANDA W-S 34 as described above but bonding using

Urethane sealant or MS Polymer sealant for a water-tight seam

3.4. Main Area Application

To create the watertight system, the installation process will rely on the layering of components; walls

layers must overlap floor to wall upturns and corners flashings likewise these must overlap floor

membrane.

Apply modified thin-set mortar to the substrate using a 1/8" to 1/4 (3 to 6 mm) V-notched trowel.

Trowel an area as wide as the sheet and as deep as can be comfortably reached. In order to avoid

trapping air under the sheet, trowel mortar in parallel rows across the width or length of the sheet.

Unroll sheet into the fresh bonding material and pressed in an effort to achieve a 100% bond and

coverage, thus eliminating air bubbles and voids between the membrane and substrate. This can be

done using a 75 or 100 lbs. (34 to 45 kg) sheet vinyl roller. Work from center of sheet to edges.

Then install the next layer leaving overlaps free. The remaining lengths can now be installed in this

same manner.

After installing the total area, proceed to bond and seal joins and treat floor to wall intersections and

corners as indicated below.

3.4.1. floors