WeatherStop Air/Water Barrier

 

WeatherStop is a flexible, fibered 100% pure acrylic trowel applied air and water barrier for use with Master Wall Systems. WeatherStop is available in five-gallon (19L) pails and is mixed 1:1 with Portland cement to a creamy consistency.

 

Coverage

160-200 square feet (14.9-18.6 square meters) - at 1/16 inch (1.6 mm) thick

 

*Coverages are estimated and vary

 

Weight: 60lbs (27kg)

 

Drying Time/Recoat Time: 12 hours under normal room temperature and humidity.

 

Application/Storage Temperatures: 40°F (5°C) to 110°F (43°C)

 

Shelf Life: 2 years under normal conditions.

 

Approved Substrates

• Exterior gypsum sheathing (ASTM C79, C1177, C1396)
• Dens Glass Gold®
• GlasRoc®
• FiberBond®
• Durock®
• PermaBase®
• Concrete
• Brick
• Masonry
• Others approved in writing

 

 

Application Procedure

Job Conditions - Air and substrate temperature for application of WeatherStop must be 40°F (5°C) or higher and must remain 40°F (5°C) or higher for a minimum of 24 hours. Provide temporary protection to protect the wall system from damage until permanent flashings, caps and sealants are installed. Store materials within prescribed temperature limits and out of direct sunlight. Working and drying times are based upon normal room temperature conditions and will vary with temperature and humidity.

 

Preparation - The substrate must be approved by Master Wall Inc., clean, dry, structurally sound and free of efflorescence, oil, grease, form release agents and curing compounds or anything that would affect bond. Painted surfaces are not acceptable and must be removed.

 

Mixing - Thoroughly stir WeatherStop using a heavy duty 1/2 inch (12.7 mm) drill at 400 - 500 rpm and a heavy duty mixing paddle. Pour half of the stirred WeatherStop into a clean plastic pail. Up to 12 ounces (0.35L) of clean, potable water may be added to adjust workability. Add Type I or I-II (Type 10) Portland cement to the half pail of WeatherStop in a ratio of one-to-one by weight and mix to a homogenous consistency. Let the mixture stand for 3 to 5 minutes and then stir to a creamy consistency. Do not exceed 24 ounces (0.7L) per pail. Do not over mix as faster setting or reduced working time can occur. Do not add accelerators or retarders to the WeatherStop mixture.

 

Application - For sheathing substrates, apply one of the sheathing board joint reinforcing methods noted below:

 

Apply a 4 inch (102 mm) strip of Master Wall Standard Mesh over the sheathing board joints and embed into wet WeatherStop. Cover all joints with an initial coating of WeatherStop and allow to dry to the touch.

 

If using WeatherStop Tapes, prime joints with BA57 and allow to dry to the touch. Apply 4 inch (102 mm) WeatherStop Tape on the sheathing board joints.

 

Water barrier application Apply the WeatherStop mixture over the entire surface of the approved substrate in a thickness of approximately 1/16 inch (1.6 mm). Allow to cure completely before proceeding the Aggre-flex or Aggre-flex Commercial Drainage EIFS or other approved applications.

 

Clean Up - Up Tools and equipment can be cleaned with soapy water while the WeatherStop is still wet.

 

Limitations - Not for use as an exterior finish.

 

Information contained in this product data sheet conforms to the standard detail recommendations and specifications for the installation of Master Wall Inc. products and is presented in good faith. Master Wall Inc. assumes no liability, expressed or implied as to the architecture, engineering, or workmanship of any project. This information may be concurrent with, or superseded by other applicable documents, such as specifications and details. Contact Master Wall Inc. for the most current product information.