part 2 products - Sto Corp.

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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

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 3 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction

    have a minimum 1:2 [27;] slope along their top surface. All foam horizontal reveals

    must have a minimum 1:2 [27;] slope along their bottom surface. Increase slope for

    northern climates to prevent accumulation of ice/snow and water on surface. Where

    trim/feature or bottom surface of reveal projects more than 2 inches (51 mm) from

    the face of the wall plane, protect the top surface with waterproof base coat. Limit

    foam thickness to a maximum of 4 inches (102 mm). Periodic inspections and

    increased maintenance may be required to maintain surface integrity of finishes on

    weather exposed sloped surfaces. Limit projecting features to easily accessible areas

    and limit total area to facilitate maintenance and minimize maintenance burden.

    Refer to Sto details.

    3. Do not use EPS foam on weather exposed projecting ledges, sills, or other projecting

    features unless supported by framing or other structural support and protected with

    metal coping or flashing. Refer to Sto details.

    E. Joints

    1. Provide two piece expansion joints in the stucco system where building movement is

    anticipated: at joints in the substrate or supporting construction, where the system is

    to be installed over dissimilar construction or substrates, at changes in building height,

    at floor lines, at columns and cantilevered areas. 222. Provide one piece expansion joints every 144 ft (13 m). Cut and wire tie lath to the

    expansion joint accessory so lath is discontinuous at or beneath the accessory. Do

    not exceed length to width ratio of 2-1/2:1 in expansion joint layout and do not exceed

    more than 18 feet (5.5 m) in any direction without an expansion joint. Where casing

    bead is used back-to-back as the expansion joint, back the joint with barrier


    3. Provide one piece expansion joints at through wall penetrations, for example, above

    and below doors or windows.

    4. Provide minimum 3/8 inch (9 mm) wide joints where the system abuts windows, doors

    and other through wall penetrations.

    5. Provide appropriate accessories at stucco terminations and joints.

    6. Provide appropriate sealant at stucco terminations and at stucco accessory butt joints. 7. Indicate location of joints, accessories and accessory type on architectural drawings.

    F. Fire Protection

    1. Use of Sto DrainScreen is limited to Type V (Combustible) construction unless

    approved for other types by the local code official.

    2. For frame walls requiring an hourly fire-resistive rating special analysis is required to

    verify the fire resistance rating of the proposed assembly.

    G. Solid Substrates ( concrete and CMU)

    1. Provide surface plane tolerance not to exceed ? inch in 10 feet (6 mm in 3.0 m). 2. Concrete Masonryprovide open texture concrete masonry units with flush joints. 3. Do not install stucco or waterproof air barrier materials over efflorescence, weak

    surface conditions, painted, coated, non-absorbent, salt-contaminated, or any concrte

    or CMU susbstrate where adhesion is in question.

    H. Stucco Thickness

1. Application to Metal Plaster Bases:

    a. Stucco thickness shall be 5/8 , ? or 7/8 inch (16, 19 or 22 mm) applied in two

    coats (not including textured finish coat).

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 4 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction

    2. Thickness shall be uniform throughout the wall area.


    A. StoGuard Waterproof Air Barrier

    1. Waterproof Air Barrier: complies with ICC ES Acceptance Criteria AC 212 (ICC ESR

    1233) 22. Material Air Leakage Resistance, ASTM E 2178: less than 0.02 L/s?m 23. Assembly Air Leakage Resistance, ASTM E 2357: less than 0.2 L/s?m

    4. Water Vapor Permeance, ASTM E 96, Method B: ?2a. Sto Gold Fill: 7.10 perms [408 ng/(Pa?s?m)] ?2b. Sto EmeraldCoat: 17.0 perms [976 ng/(Pa?s?m)]

     5. Surface Burning, ASTM E 84:

     a. Flame Spread, less than 25

     b. Smoke Developed, less than 50

    c. Class A Building Material

     6. Tensile Adhesion, ASTM C 297:

     Gypsum Sheathing, exceeds strength of substrate

     Plywood, > 85 psi (590 kPa)

     OSB, > 30 psi (206 kPa)

    7. VOC, calculation:

    a. Less than 100 g/L

    b. Complies with US EPA 40 CFR 59 for waterproofing/sealer

    c. Complies with South Coast AQMD Rule 1113 for waterproofing/sealer

     B. 103 StoPowerwall Fiber Reinforced Stucco

    1. Complies with ICC AC 11.

    *Note: refer to the appropriate Sto Technical Bulletin for performance data on Sto finishes for use over

    StoPowerwall Stucco


    A. Manufacturer's specifications, details, installation instructions and product data.

    B. Manufacturer’s code compliance report for air barrer and water-resistive barrier.

    C. Manufacturer's standard warranty.

    D. Samples for approval as directed by architect or owner.

    E. EPS board manufacturer's certificate of compliance with ASTM E 2430-05, Standard

    Specification for Expanded Polystyrene (“EPS”) Thermal Insulation Boards For Use in Exterior

    Insulation and Finish Systems (“EIFS).

    F. Prepare and submit project-specific details (when required by contract documents).


    A. Manufacturer requirements

    1. Stucco products manufacturer for a minimum of twenty (20) years.

    2. Stucco finish products and waterproof air barrier products manufactured under ISO

    9001:2008 Quality System and 14001:2004 Environmental Management System. Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 5 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction

B. Contractor requirements

    1. Licensed, insured and engaged in application of portland cement stucco for a

    minimum of three (3) years.

    2. Knowledgeable in the proper use and handling of Sto materials.

    3. Employ skilled mechanics who are experienced and knowledgeable in portland

    cement stucco application, and familiar with the requirements of the specified work.

    4. Successful completion of minimum of three (3) projects of similar size and

    complexity to the specified project.

    5. Provide the proper equipment, manpower and supervision on the job site to install the

    system in compliance with Sto's published specifications and details and the project

    plans and specifications.

C. Insulation board manufacturer requirements

    1. Recognized by Sto as capable of producing insulation board to meet system

    requirements, and hold a valid licensing agreement with Sto.

    2. Listed by an approved agency. Label insulation board with information required by

    Sto, the approved listing agency, and the applicable building code.

D. Testing (for projects of sufficient size or complexity)

    1. Construct full-scale mock-up of typical stucco/window wall assembly with specified

    tools and materials and test air and water infiltration and structural performance in

    accordance with ASTM E 283, E 331 and E 330, respectively, through independent

    laboratory. Mock-up shall comply with requirements of project specifications. Where

    mock-up is tested at job site maintain approved mock-up at site as reference

    standard. If tested off-site accurately record construction detailing and sequencing of

    approved mock-up for replication during construction.

    2. Conduct adhesion testing to concrete and concrete masonry surfaces to verify

    adequacy of surface preparation techniques and adhesion.

E. Inspections

    1. Provide independent third party inspection where required by code or contract


    2. Conduct inspections in accordance with code requirements and contract documents.


    A. Deliver all materials in their original sealed containers bearing manufacturer's name and

    identification of product.

B. Protect coatings (pail products) from freezing and temperatures in excess of 90;F (32; C).

    Store away from direct sunlight.

    C. Protect portland cement based materials (bag products) from moisture and humidity. Store

    under cover off the ground in a dry location.


    (Weather conditions affect application, drying time and curing requirements. Hot or dry conditions limit working time and accelerate drying and may require adjustments in application, scheduling and curing to achieve desired results; cool or damp conditions extend working time and retard drying and may require added measures of protection against wind, dust, dirt, rain and freezing.)

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 6 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction

A. Maintain ambient and surface temperatures above 40;F (4;C) during application and for 24

    hours after set of stucco and application of waterproof air barrier and finish materials.

B. Provide supplementary heat for installation in temperatures less than 40;F (4;C) such that

    temperatures are maintained as in 1.09A. Prevent concentration of heat on uncured stucco

    and vent fumes and other products of combustion to the outside to prevent contact with


    C. Prevent uneven or excessive evaporation of moisture from stucco during hot, dry or windy

    weather. For installation under any of these conditions provide special measures to properly

    moist cure the stucco. Do not install stucco should ambient temperatures be expected to rise

    above 100ºF (38ºC) within a 24 hour period.

    D. Provide protection of surrounding areas and adjacent surfaces from application of materials.


    (The work in this section requires close coordination with related sections and trades. Sequence work to provide protection of construction materials from weather deterioration)

    A. Protect sheathing from climatic conditions to prevent weather damage until the installation of

    the waterproof air barrier.

    B. Protect waterproof air barrier with stucco cladding within 60 days of installation.

C. Protect drainage mat with stucco cladding within 30 days of installation.

    D. Commence the stucco installation after completion of all floor, roof construction and other

    construction that imposes dead loads on the walls to prevent excessive deflection (and

    potential cracking) of the stucco.

    E. Sequence interior work such as drywall installation prior to stucco installation to prevent stud

    distortion (and potential cracking) of the stucco.

    F. Provide site grading such that the stucco terminates above earth grade minimum 4 inches

    (100 mm) and above finished grade (pavers/sidewalk) minimum 2 inches (51 mm). Provide

    increased clearance in freeze/thaw climate zones.

    G. Coordinate installation of foundation waterproofing, roofing membrane, windows, doors and

    other wall penetrations to provide a continuous air barrier. Provide protection of rough

    openings before installing windows, doors, and other penetrations through the wall and

    provide sill flashing. Coordinate installation of waterproof air barrier components with window

    and door installation to provide weather proofing of the structure and to prevent moisture

    infiltration and excess air infiltration.

    H. Install window and door head flashing immediately after windows and doors are installed.

    I. Install diverter flashings wherever water can enter the wall assembly to direct water to the


    J. Install copings and sealant immediately after installation of the stucco and when finish

    coatings are dry.

    K. Attach penetrations through stucco to structural support and provide air tight and water tight

    seals at penetrations.

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 7 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction


    A. Provide manufacturer's standard warranty.



    A. Sto Corp., 3800 Camp Creek Parkway, Building 1400, Suite 120. Atlanta, GA 30331


    A. StoGuard-- fluid applied waterproof air barrier for sheathing and concrete masonry substrates

    consisting of multiple compatible components:

    1. Sto Gold Fill -- ready mixed acrylic based flexible joint treatment for rough opening

    protection, joint treatment of wall sheathing, CMU crack repair, and connections with


    2. Sto EmeraldCoat -- ready mixed flexible waterproof coating for wall sheathing,

    concrete and CMU wall surfaces. 223. StoGuard Mesh-- nominal 4.2 oz/yd (142 g/m), self-adhesive, flexible, symmetrical,

    interlaced glass fiber fabric, with alkaline resistant coating for compatibility with Sto ?materials (used with Sto Gold Fill to reinforce rough openings, inside and outside

    corners, sheathing joints, and connections with flashings)

    4. StoGuard Fabricnonwoven cloth reinforcement used with Sto EmeraldCoat to

     treat sheathing joints, inside and outside corners and rough openings

    5. StoGuard RediCornera preformed fabric piece used in the corners of the rough

     openings for quicker installation of the StoGuard system.

    6. StoGuard Tape self adhering rubberized asphalt tape for rough opening protection

    in wood or metal frame construction, and transition detailing (refer to Sto Details).

    7. StoGuard RapidSeal one component quick drying waterproof air barrier material

    for rough opening protection, sheathing joints (with StoGuard Mesh), CMU crack

    repair, and transition detailing (refer to Sto Details)

2.03 WATER-RESISTIVE BARRIER (supplied by others)

    A. Minimum No. 15 asphalt saturated felt complying with ASTM D 226, Type 1, or

     one layer of Grade D kraft building paper, or paperbacked stucco lath conforming to 2.05.


    A. Sto DraInScreen nominal ?‖ (6 mm) tangled filament nylon core drainage mat with fabric


2.05 LATH (supplied by others)

     22A. Minimum 2.5 lb./yd (1.4 kg/m) self-furred galvanized steel diamond mesh metal lath in

    compliance with ASTM C 847 (recommended for residential and commercial construction).

    (Note: metal lath is susceptible to corrosion in coastal environments. Provide weather protection to

    prevent moisture entry into wall construction as outlined in Design Requirements Section 1.04B).

2.06 MECHANICAL FASTENERS (supplied by others)

Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 8 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction

    A. Appropriate non-corroding fasteners, depending on the type framing or substrate:

    1. Wood Framing--minimum 11 gauge, 7/16 inch (11 mm) diameter head galvanized

    roofing nails with minimum ? inch (19mm) penetration into studs or minimum #8

    Type S wafer head fully threaded corrosion resistant screws with minimum ? inch (19

    mm) penetration into studs.

    2. Steel Framingminimum #8 Type S or S-12 wafer head fully threaded corrosion

    resistant screws with minimum 3/8 inch (10 mm) penetration into studs.

    3. Concrete or Masonryminimum # 8 wafer head fully threaded corrosion resistant

    screws for masonry with minimum 1 inch (25 mm) penetration into substrate.

    Note: pull-out or withdrawal capacity of the selected fastener must be verified with respect to anticipated wind load, desired safety factor and building code requirements. Consult applicable code compliance report for specific assemblies and fastening schedules.

    B. Tie Wire18 gauge galvanized and annealed low-carbon steel in compliance with ASTM A

    641 with Class I coating.

    2.07 ACCESSORIES (supplied by others, select one type)

    A. Weep screed, casing bead, corner bead, corner lath, expansion and control joint accessories.

    All accessories shall meet the requirements of ASTM C 1063 and its referenced documents:

    1. PVC plastic in compliance with ASTM D 1784, cell classification 13244C.

    2. Zinc in compliance with ASTM B 69.

    3. Galvanized metal in compliance with ASTM A 653 with G60 coating.

    B. All accessories shall have perforated or expanded flanges and shall be designed with grounds

    for the specified thickness of stucco.

    (Note: metal accessories are susceptible to corrosion in coastal environments. Consider the use of zinc alloy or PVC accessories in these environments. Metal corner beads with solid metal noses are susceptible to corrosion in exposed exterior applications. Consider the use of several layers of woven-wire mesh in lieu of corner bead and completely encase the metal in stucco. Care must be taken when attaching metal lath or other wall assembly components so that fasteners go into [not between] framing supports. Powder actuated or other fastening devices that can damage the water-resistive barrier or sheathing should be avoided).


A. Waterclean and potable.

    2.09 STUCCO

    A. 103 StoPowerwall Stucco factory proportioned, fiber reinforced portland cement based

    stucco for trowel or pump application, field mixed with graded sand and water.

B. 103 StoPowerwall Stucco Polymer Modified polymer modified, factory proportioned, fiber

    reinforced portland cement based stucco, field mixed with graded sand, water and Sto

    Bonding Agent and Admixture.


A. Adhesive

    1. Sto BTS-Plusone component, polymer modified, cement based high build adhesive.

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 9 of 19 Created: May, 2011

    SPECIFICATION S 103 DS 103 StoPowerwall? NExT

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

    Frame Construction

B. Insulation Board

     331. Sto EPS Insulation Board--nominal 1.0 lb/ft (16 kg/m) Expanded Polystyrene (EPS)

    Insulation Board in compliance with ASTM C 578 Type I requirements, and ASTM E

    2430 (Note: minimum required thickness is 1 inch [25 mm] and maximum allowable

    thickness is typically 4 inches [100 mm] for noncombustible type construction unless

    thicker dimensions are approved by the code official).

C. Reinforcing Mesh

     221. Sto Mesh--nominal 4.5 oz./yd (153 g/m), symmetrical, interlaced open-weave glass

    fiber fabric treated with alkaline resistant coating for compatibility with Sto materials

    (achieves Standard Impact Classification).

     222. Sto Detail Mesh--nominal 4.2 oz/yd (143 g/m), flexible, symmetrical, interlaced

    open-weave glass fiber fabric treated with alkaline resistant coating for compatibility

    with Sto materials (used for standard foam backwrapping and aesthetic detailing).

D. Base Coats

    1. Sto BTS-Plusone-component polymer modified cement based high build base coat

    with less than 33 percent portland cement content by weight and capable of achieving

    minimum 1/16 inch (1.6 mm) thickness in one pass.

    2. Sto Flexylfiber reinforced acrylic based waterproof base coat mixed with portland

    cement (for use as a waterproof base coat to waterproof foundations, parapets,

    splash areas, trim and other projecting architectural features).

    2.11 PRIMER (select one)

A. Sto Primer Sandacrylic based tinted primer.

B. Sto Hot Primeacrylic based primer/sealer for high pH surfaces.

     (Note: priming is recommended to provide uniform substrate absorption and finish color, to improve adhesion and water resistance, and to retard efflorescence). Sto Hot Prime may be applied 48 hours after moist curing the brown coat. Sto Primer Sand requires 28 days curing of brown coat before application.

    2.12 FINISH COAT (select one)

    A. StoPowerwall Finish integrally colored, factory blended, flexible acrylic textured finish with

    graded marble aggregate.

    B. Sto Powerflex Finish integrally colored, factory blended, elastomeric textured finish with

    graded marble aggregate

    C. Sto Powerflex Silco Finish integrally colored, factory blended, silicone enhanced

    elastomeric textured finish with graded marble aggregate

    2.13 MIXING

A. StoGuard

    Sto Guide Specification Sto Corp. is an ISO 9001:2008 and 14001:2004 Registered Company Page 10 of 19 Created: May, 2011

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