Installation Instructions

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2.2. Suitable Substrates
2.2.1. Interiors
Concrete, concrete & brick masonry, cement mortar beds, cement plaster, gypsum wallboard,
exterior glue plywood, ceramic tile & stone, cement terrazzo, cement backer board, poured gypsum
underlayment, fiber-cement underlayment, fiber-reinforced water-resistant gypsum backer
board/underlayment
2.2.2. Exteriors
Concrete, ceramic tile & stone, cement terrazzo
2.3. Limitations
Do not use as a primary roofing membrane over occupied space.
WATER-STOP cannot accommodate deflection greater than industry guidelines for the flooring surface.
Do not use over dynamic expansion joints, structural cracks or cracks with vertical differential
movement. Do not use over cracks >1/8" (3 mm) in width.
Do not bond to particle board, OBS, interior glue plywood or hardwood surfaces.
Do not expose to negative hydrostatic pressure.
WATER-STOP is not designed for use as a wearing surface or exposed roof membrane. It must be
covered with ceramic tile, stone, brick, concrete, screeds, terrazzo or other protective surface. For
temporary cover, use protection board.
Do not expose membrane directly to sun or weather for more than 5 days.
3. Installation Procedures
WATER-STOP membrane should be bonded to substrate with modified thin-set mortar. Thin-sets must be
appropriate for the substrate and conform to ANSI A118.4 or the appropriate standards, and TCNA
Handbook recommendations.
After installation, sheet must be kept clean to enable tile adhesive to bond. For temporary cover, protect
the installed sheet from damage and all foot or vehicular traffic. Use protection board, rugs, plywood, etc.
3.1. Surface Preparation
Check and prepare the surface: it must be clean, firm and flat and have the correct slope.
It is important to note that the substrate or setting bed surface must meet the same substrate
smoothness criteria required for direct bond tile / stone applications.
The substrate should be cleaned just prior to installing the membrane. Remove dust, dirt, oil, grease,
paint, laitance, efflorescence, curing compounds, sealers, water repellents and other materials that
prevent bond. Dampen hot, dry surfaces and sweep off excess water.
Use a suitable substrate mortar or underlayment, to patch, pitch, level, plumb, flatten or smooth
substrates.
Existing ceramic/stone tile, glazed concrete masonry units or cementitious terrazzo must be cleaned
and skim coated with suitable patching compound or latex thin-set mortar (consult with thin set mortar
manufacturer for their specific product recommendations).
3.2. Planning & Layout
Cut the membrane to size. Be sure to allow for 2-3" overlap at all seam locations, 4-6" for upturn at
walls when waterproofing.
In floors installations lay the sheets so that seams overlap in the direction of the slope at shingled