Cement Board MD Finish System™
1Pages

Printed in USA R2:01-10-05 ©Dryvit Systems, Inc. 2003 Information contained in this product sheet conforms to the standard detail recommendations and specifications for the installation of Dryvit Systems, Inc. products as of the date of publication of this document and is presented in good faith. Dryvit Systems, Inc. assumes no liability, expressed or implied, as to the architecture, engineering or workmanship of any project. To ensure that you are using the latest, most complete information, contact Dryvit Systems, Inc. CEMENT BOARD MD FINISH SYSTEMÆË DS480 An Exterior Finish System Applied Over Exterior Cement Board With a Secondary Weather Resistive Barrier and Moisture Drainage. Description Cement Board MD Finish System consists of an acrylic-modified base coat with reinforcing mesh embedded and finish applied over an approved exterior cement board. The exterior cement board (by others) and fasteners (by others) are applied over Dryvit MD Spacers (drainage medium), Dryvit Backstop NT or other code approved secondary weather resistive barrier and approved exterior sheathing. Uses Cement Board MD Finish System is applied over approved sheathing substrates in residential and low-rise commercial applications when exterior insulation is not required. Coverage All coverages are approximate and may vary slightly, depending on substrate, details and individual application technique. Dryvit Components Backstop NT™ - Texture: 23-28 m2 (230-300 ft2) per 19 L (5 gal) pail, including joint treatment, when applied by roller in accordance with Dryvit recommendations. Backstop NT™ - Smooth: Approximately 46 m2 (500 ft2) per 19 L (5 gal) pail, when applied by roller in accordance with Dryvit recommendations. Genesis®: Approximately 23 m2 (250 ft2) of surface area per 27 kg (60 lb) pail. Coverage rate includes embedding strips of Detail mesh at all exterior cement board sheathing joints and a continuous layer of reinforcing mesh over the entire exterior cement board face. Genesis DM™: Approximately 10 m2 (105 ft2) of surface area per 23 kg (50 lb) bag. Coverage rate includes embedding strips of Detail mesh at all exterior cement board sheathing joints and a continuous layer of reinforcing mesh over the entire exterior cement board face. Genesis DMS™: Approximately 11 m2 (118 ft2) of surface area per 23 kg (50 lb) bag. Coverage rate includes embedding strips of Detail mesh at all exterior cement board sheathing joints and a continuous layer of reinforcing mesh over the entire exterior cement board face. Reinforcing Mesh: Standard® 1.2 m x 46 m (4 ft x 150 ft) provides 56 m2 (600 ft2) of coverage. Finishes: Refer to the individual product data sheets for the specified finish. Application Procedure Job Conditions Air and surface temperature for application of Cement Board MD Finish System materials must be 4 °C (40 °F) or higher and must remain so for a minimum of 24 hours. Temporary Protection - Must be provided at all times to protect against damaging effects of precipitation, dirt and job-site contamination. Substrates/Preparation - Surfaces must be above 4 °C (40 °F) or higher and must be clean, dry, structurally sound and free of efflorescence, grease, oil and paint. Mixing Dryvit materials must be mixed in accordance with current Dryvit literature. Application - Cement Board MD Finish System materials must be applied in accordance with current Dryvit Cement Board MD Finish System Specifications, DS191. Dryvit finishes must be applied in accordance with published Dryvit instructions for the specific finish being used. Refer to the published product sheet for the appropriate finish. Clean-Up - Clean tools with water while product is still wet. Storage Store bags and pails on pallets, wrapped or covered, protected from the weather and direct sunlight until just before mixing. Minimum storage temperature for wet goods shall be 4 °C (40 °F). Cautions and Limitations* • Use is limited to applications on projects not exceeding 3 stories • Minor cracking is possible in the finished exterior surface. • Non-insulated claddings may exhibit shadowing (ghosting) of fasteners and or framing members due to varying exterior surface temperatures. • Critical light will tend to exaggerate construction irregularities when coatings are applied directly to sheathing in framed construction. • Base coat material shall not be used to level wall surface imperfections. • Consult exterior cement board manufacturer requirements for stud spacing, fastening requirements and other design and installation considerations. *Exterior cement board direct applied systems have limited design freedom and performance compared to exterior insulation and finish systems. Refer to Dryvit’s Outsulation® family of insulated wall cladding for increased design and performance. Technical and Field Services Available on reasonable request. Warranty Dryvit Systems, Inc. shall provide a limited warranty against defective material and drainage upon written request. Dryvit shall make no other warranties, expressed or implied. Dryvit does not warrant workmanship. Full details are available from Dryvit Systems, Inc. Dryvit Systems, Inc. P. O. Box 1014 One Energy Way West Warwick, RI 02893 (800) 556-7752 www.dryvit.com