part 2 products - Sto Corp.

By Carlos Austin,2014-11-12 10:25
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part 2 products - Sto Corp.

     Sto Corp. 3800 Camp Creek Parkway Building 1400, Suite 120 Atlanta, GA 30331 Phone: 404-346-3666 Fax: 404-346-7422 www.

    Sto Specification S 103 DS

     ??103 StoPowerwall NExT DrainScreen? for Concrete,

    Concrete Masonry (CMU), and Frame Construction

    Section 09 24 23 Portland Cement Stucco

    This guide specification is intended for use by the design/construction professional and any user of Sto products to assist in developing project specifications for a stucco wall assembly incorporating an air barrier, water-resistive barrier (WRB), and drainage mat on Type V (Combustible) construction. Notes in Italics, such as this one, are explanatory and intended to guide the design professional/specifier and user in the proper ? selection and use of materials. 103 StoPowerwall NExT DrainScreen incorporates StoGuardwaterproof air

    barrier, Sto DrainScreen drainage mat, 103 StoPowerwall fiber reinforced stucco, and Sto finishes. StoGuard functions in tandem with other compatible air barrier components of the building envelope and flashing to limit air and water infiltration. A code compliant asphalt saturated felt or paper WRB is recommended over StoGuard for wood and gypsum based sheathings. Sto DrainScreen creates a cavity behind the stucco cladding to promote drainage and drying of the wall assembly in the event of incidental water intrusion from a breach in the stucco cladding. 103 StoPowerwall Stucco is a fiber-reinforced stucco intended as a base for any of the Sto exterior stucco finishes. For complete technical information on Sto components refer to product bulletins, guide details, and other technical information available at

    The incorporation of StoPowerwall NExT DrainScreen components in the wall assembly is not intended to correct faulty components, design, or workmanship. As with any exterior wall assembly the proper detailing and integration of components, in particular flashing to direct water to the exterior, is essential. Efflorescence is a normal occurrence in portland cement based products and can affect final appearance of finish products installed over stucco. Some degree of cracking is normal in portland cement stucco and should be expected. Cracking is generally not caused by a material defect in the stucco and can be minimized by following sound construction practice such as the proper installation of lath, the proper incorporation of stress relief joints in the construction, moist curing of the stucco after it has been applied, and proper sequencing of construction to avoid stresses in the freshly placed stucco. Specific wall assemblies incorporating StoPowerwall Stucco are also listed in code compliance reports available on request from Sto Corp. or from ICC Evaluation Services, Inc.

    The weather protection afforded by StoPowerwall NExT DrainScreen should be evaluated by the design/construction professional in relation to building design, height, orientation, climate zone, and any other factors that affect the severity of exposure to rain and water intrusion potential. Modifications should be made to this specification as deemed necessary by the design/construction professional to ensure control of condensation from water vapor diffusion, and an airtight and watertight building envelope.



    A. Materials and installation of exterior stucco wall covering with waterproof air barrier and

    drainage cavity.

1.02 RELATED SECTIONS (add/delete, depending on specific project requirements):

    A. Section 03 30 00: Cast-In-Place Concrete

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 1 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

    DrainScreen? for Concrete. Concrete Masonry (CMU), and

    Frame Construction

B. Section 04 20 00: Unit Masonry

    C. Section 06 16 00: Sheathing

    D. Section 07-26 00: Vapor Retarders

    E. Section 07 27 00: Air Barriers

    F. Section 07 50 00: Membrane Roofing

    G. Section 07 62-00: Sheet Metal Flashing and Trim

    H. Section 07 92 00: Joint Sealants

    I. Section 08 40-00: Entrances Storefronts, and Curtain Walls

    J. Section 08 50 00: Windows

    K. Section 09 28 16: Glass-Mat Faced Gypsum Backing Boards

    1.03 REFERENCED DOCUMENTS (add/delete depending on specific project requirements)

A. ASTM Standards:

    1. A 641 Standard Specification for Zinc-Coated (Galvanized ) Carbon Steel Wire

    2. A 653 Specification for Sheet Steel Zinc coated (Galvanized) by the Hot-Dip

    Process, Commercial Quality

    3. B 69 Specification for Roller Zinc

    4. C 144 Specification for Aggregate for Masonry Mortar

    5. C 297 Standard Test Method for Flatwise Tensile Strength of Sandwich


    6. C 578 Specification for Preformed, Cellular Polystyrene Thermal Insulation

    7. C 847 Standard Specification for Metal Lath

    8. C 897 Standard Specification for Aggregate for Job-Mixed Portland Cement-

    Based Plasters

    9. C 926 Standard Specification for Application of Portland Cement-Based Plaster

    10. C 1063 Standard Specification for Installation of Lathing and Furring for Portland

    Cement Plaster

    11. C 1177 Specification for Glass Mat Gypsum for Use as Sheathing

    12. D 226 Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing

    and Waterproofing

    13. D 1784 Specification for Rigid Poly (Vinyl Chloride) (PVC) Compounds and

    Chlorinated Poly (Vinyl Chloride) (CPVC) Compounds

    14. E 96 Standard Test Methods for Water Vapor Transmission of Materials

    15. E 283 Test Method for Determining Rate of Air Leakage Through Exterior

    Windows, Curtain Walls, and Doors Under Specified Pressure Differences

    Across the Specimen

    16. E 330 Test Method for Structural Performance of Windows, Curtain Walls, and

    Doors by Uniform Static Air Pressure Difference

    17. E 331 Test Method for Water Penetration of Exterior Windows, Skylights, Doors,

    and Curtain Walls by Uniform Static Air Pressure Difference

    18. E 2178 Standard Test Method for Air Permeance of Building Materials

    19. E 2357 Standard Test Method for Determining Air Leakage of Air Barrier


    20. E 2430 Standard Specification for Expanded Polystyrene (―EPS‖) Thermal

    Insulation Boards For Use in Exterior Insulation and Finish Systems


B. APA Engineered Wood Association

    1. E 30 Residential and Commercial Construction Guide

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 2 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

    DrainScreen? for Concrete. Concrete Masonry (CMU), and

    Frame Construction

C. ICC ES (International Code Council Evaluation Service)

    1. AC 212, Acceptance Criteria for Water-resistive Coatings used as Water-resistive

    Barriers over Exterior Sheathing

    2. AC 11, Acceptance Criteria for Cementitious Exterior Wall Coatings

    3. ICC ESR 1233: StoGuard with Gold Coat and StoGuard with EmeraldCoat Water-

    resistive Barriers

D. Proprietary Publications

     1. Sto S 422 StoGuard Waterproof Air Barrier Handbook


A. Structural (wind and axial loads)

    1. Design for maximum allowable deflection, normal to the plane of the wall of L/360.

    For reduced risk of cracking in stucco on frame walls stiffen deflection criteria.

    2. Design for wind load in conformance with code requirements.

    B. Moisture Control

    1. Prevent the accumulation of water into or behind the stucco, either by condensation

    or leakage into the wall construction, in the design and detailing of the wall assembly.

    a. Provide corrosion resistant flashing to protect exposed elements and to direct

    water to the exterior, including, above window and door heads, beneath window

    and door sills, at floor lines, at roof/wall intersections, decks, abutments of lower

    walls with higher walls, above projecting features, and at the base of the wall.

    b. Air Leakage Preventionprevent excess air leakage in the design and detailing

    of the wall assembly. Provide continuity between air barrier components in the

    wall assembly. Refer to StoGuard Waterproof Air Barrier Handbook.

    c. Vapor Diffusion and Condensation -- perform a dew point analysis of the wall

    assembly to determine the potential for accumulation of moisture in the wall

    assembly as a result of water vapor diffusion and condensation. Adjust wall

    assembly components accordingly to minimize the risk of condensation. Avoid

    the use of vapor retarders on the interior side of the wall in warm, humid climates.

    d. Provide StoGuard Waterproof Air Barrier over sheathing, concrete and masonry.

    e. At expansion joints, back joints with barrier membrane. Refer to Sto details at

    f. Seal stucco terminations and accessory butt joints with appropriate sealant.

C. Grade Condition

    1. Do not specify the stucco for use below grade or on surfaces subject to continuous

    or intermittent water immersion or hydrostatic pressure. Provide minimum 4 inch

    (100 mm) clearance above earth grade, minimum 2 inch (51 mm) clearance above

    finished grade (pavers/sidewalk). Provide increased clearance in freeze/thaw

    climate zones.

    D. Sloped surfaces, including Foam Trim and Projecting Architectural Features Attached to


    1. Avoid the use of stucco on build-outs or weather exposed sloped and horizontal

    surfaces (refer to 2 and 3 below).

    2. Build out trim and projecting architectural features from the stucco wall surface with

    code compliant EPS foam. All foam trim and projecting architectural features must