Installation Instructions

fashion. Avoid cross-lapped seams and seams over drains, protrusions etc. Use chalk lines to maintain

sheet alignment.

Sheet may be pre-folded and cut to accommodate upturns and other requirements per industry

guidelines and specifications.

3.3. Treat Connections to Fixed Building Elements & Joints

Treat all elements such as expansion joints, penetrations and floor gully connections using the W-S

Waterproofing Accessories. All flashings and penetrations of pipes, conduits, fixtures, etc. must be

sealed using Urethane sealant or MS Polymer Sealant or other suitable similar sealing compounds.

3.3.1. Drains

Drains must have a suitable membrane clamping collar or an integrated bonding flange.

In areas when more than one sheet or more than one drain is needed; if installing with a clamping

ring type drains with weepers as per ASME A112.6.3 treat the drain connection before the

waterproofing installation.

Install W-S DRAINFLASH or treat with a drain flashing made with a 12x12" section of WATER-STOP

membrane:

Remove strainer and clamping ring. Lay the flashing piece over the top of the drain and cut an

“X” where each bolt will penetrate the membrane. Carefully cut a hole in the membrane to allow

the drain grate to be threaded into the clamping ring and seal with 2 beads of Urethane sealant

or MS Polymer sealant between the drain body and the underside of the membrane. Reset the

drain clamping ring and tighten clamping ring bolts.

Apply thin-set mortar to the floor area from the outer edge of the drain.

Bond the flashing membrane to substrate with latex modified thin-set. Embed the piece into

bond coat.

When installing the WATER-STOP membrane in main application remove the clamping ring, and

do as indicated for drains with bonding flange bellow.

In small areas with a single floor drain as in showers, the connection to drain of WATER-STOP

membrane sheet can be done at waterproofing installation.

When installing with a clamping ring type drains with weepers as per ASME A112.6.3:

Remove strainer and clamping ring. Lay the WATER-STOP membrane over the top of the drain

and trace drain hole opening and bolt holes: cut an “X” where each bolt will penetrate the

membrane. Carefully cut out inside drain opening to allow the drain grate to be threaded into

the clamping ring.

Apply thin-set mortar to the floor area from the outer edge of the drain outward.

Apply 2 beads of Urethane sealant or MS Polymer sealant around the drain hole opening to seal

between the drain body and the underside of the membrane and install the WATER-STOP

membrane properly embedded into bond coat, making sure to align the previously cut holes for

the bolts and drain opening.

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.

Reset the drain clamping ring and tighten clamping ring bolts through openings in the membrane.

Protect weep holes from clogging. Replace the strainer and adjust to proper height for tile

When installing with a drain with integrated bonding flange, follow the manufacturer instructions to

install the drain. Once the mortar is cured enough to walk on, the WATER-STOP membrane can

then be installed.

Apply thin-set mortar to the floor area including the drain bonding flange except the inner 3-4”

area