Specification A500 Sto System Plus 1
Sto System Plus 1 PB Exterior Insulation and Finish System (EIFS)
with Mineral Wool Insulation
Specification A500
Section 07240
This specification is intended for use by the design professional/specifier and user of Sto products to assist in developing project specifications for the application of a Sto Class PB Exterior Insulation and Finish System (EIFS) to new or existing construction that meets the requirements of the project specifications. 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. This specification should be modified where necessary to accommodate individual project conditions
PART 1 GENERAL
1.01 SECTION INCLUDES
A. Materials and installation of Class PB EIF System.
1.02 RELATED SECTIONS (add/delete, depending on specific project requirements):
A. Section 03300: CastInPlace Concrete
B. Section 04200: Unit Masonry
C. Section 06115: Sheathing
D Section 07190: Vapor Barriers
E. Section 07195: Air Barriers
F. Section 07620: Sheet Metal Flashing and Trim
G. Section 07920: Sealants and Caulking
H. Section 09260: Gypsum Board Systems
1.03 REFERENCED DOCUMENTS (add/delete depending on specific project requirements)
A. ASTM Standards:
1. B 117 Test Method for Salt Spray (Fog) Testing
2. C 79 Test Method for Gypsum Sheathing Board
3. C 150 Specification for Portland Cement
4. C 297 Test Method for Tensile Strength of Flat Sandwich Constructions in Flatwise Plane
5. C 578 Specification for Preformed, Cellular Polystyrene Thermal Insulation
6. C 612 Specification for Mineral Fiber Block and Board Thermal Insulation
7. C 1135 Test Method for Determining Tensile Adhesion Properties of Structural Sealants
8. C 1177 Specification for Glass Mat Gypsum Substrate for Use as Sheathing
9. C 1185 Methods of Sampling and Testing NonAsbestos FiberCement Flat Sheet Roofing and Siding Shingles, and Clapboards
10. C 1186 Specification for Flat NonAsbestos FiberCement Sheets
11. D 968 Test Method for Abrasion Resistance of Organic Coatings by Falling Abrasive
12. D 2247 Practice for Testing Water Resistance of Coatings in 100% Relative Humidity
13. D 3273 Test for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber
14. D 4258 Standard Practice for Surface Cleaning Concrete for Coating
15. D 4261 Standard Practice for Surface Cleaning Concrete Unit Masonry for Coating
16. E 84 Test Method for Surface Burning Characteristics of Building Materials
17. E 119 Method for Fire Tests of Building Construction and Materials
18. E 330 Test Method for Structural Performance of Exterior Windows, Curtain Walls and Doors by Uniform Static Air Pressure Difference
19. E 331 Test Method for Water Penetration of Exterior Windows, Curtain Walls and Doors by Uniform Static Air Pressure Difference
20. G 23 Recommended Practice for Operating Light and WaterExposure Apparatus (CarbonArc Type) for Exposure of Nonmetallic Materials
B. Building Code Standards
1. UBC Standard 268, Intermediate Scale Multistory Test Procedure, International Conference of Building Officials (ICBO)
2. Section 1406.0, 1993 National Building Code, Building Officials and Code Administrators International (BOCA)
3. Section 2603.5, 1994 Standard Building Code, Southern Building Code Congress International (SBCCI)
C. EIMA (EIFS Industry Members Association) Standards and Publications
1. 101.86 Standard Test Method for Resistance of Exterior Insulation and Finish Systems (EIFS), Class PB, to the Effects of Rapid Deformation (Impact)
2. 105.01 Standard Test Method for Alkali Resistance of Glass Fiber Reinforcing Mesh for Use in Exterior Insulation and Finishing Systems (EIFS), Class PB
3. 300.01 Standard Test Method for Determining Tensile Adhesion Properties of Sealants when used with Exterior Insulation and Finish Systems (EIFS), Class PB
4. EIMA Guide for use of Sealants With Exterior Insulation and Finish Systems (EIFS), Class PB
5. EIMA Tech Notes WC 101, "Selection of Sheathing for Class PB Exterior Insulation and Finish Systems (EIFS)"
D. Gypsum Association
1. GA-600 Fire Resistance Design Manual
2. GA-253 Application of Gypsum Sheathing
3. GA-254 Fire Resistant Gypsum Sheathing
E. American Plywood Association
1. J20G Grades and Specifications Guide
F. Proprietary Specifications
1. Lit. # 102250 - Dated 1/95 GeorgiaPacific Corporation, "Dens Glass Gold"
1.04 DESIGN REQUIREMENTS
A. Design for maximum allowable system deflection, normal to the plane of the wall, of L/240.
B. Design for wind load in conformance with code requirements.
C. Prevent the accumulation of water behind the system, either by condensation or leakage through the wall construction, in the design and detailing of the wall assembly.
D. Indicate areas with impact resistance other than “Standard” on contract drawings.
E. Design minimum 3/4 inch (19 mm) wide expansion joints in the EIFS where they exist in the substrate or supporting construction, where the EIFS adjoins dissimilar construction or materials, at changes in building height, and at floor lines in multilevel woodframe construction.
F. Design minimum 2 inch (13 mm) wide sealant joints at penetrations through the EIFS (windows, doors, etc.).
G. Specify compatible backer rod and sealant in accordance with "EIMA Guide for Use of Sealants with Exterior Insulation and Finish Systems (EIFS), Class PB". Specify sealant in compliance with minimum 50% elongation requirement before and after conditioning when tested in accordance with EIMA Standard 300.01.
H. Do not specify EIFS for use on surfaces subject to continuous or intermittent water immersion or hydrostatic pressure. For below grade applications, specify Sto Flexyl [see Addendum to Sto specification A500].
I. Do not specify the system below grade on wood frame construction in geographic areas with termite/insect control problems. Consult local codes for any special construction requirements. Use termite shields or another method of detailing to protect against or detect termites/insects.
J. Sloped surfaces: minimum slope is 1:2 [27 degrees] and maximum width is 12 inches [300 mm]. Sto Mesh embedded in Sto Flexyl is required beneath finish coating. Increase slope for northern climates to prevent accumulation of ice/snow and water on surface. Periodic inspections and increased maintenance of coating may be required).
1.05 PERFORMANCE REQUIREMENTS
A. System Performance Durability
TEST / METHOD / CRITERIA / RESULT1. Accelerated Weathering / ASTM G-23 / No deleterious effects* at 2000 hours when viewed under 5x magnification / Passed
2. Freeze/Thaw Resistance / ICBO Acceptance Criteria / No deleterious effects* at 10 cycles / Passed
3. Water Penetration / ASTM E-331 / No water penetration
at 2.86 PSF (137 Pa)
after 15 minutes / Passed
4. Tensile Adhesion / ASTM C 297 / No failure in the adhesive, base coat or finish coat. Minimum 5 PSI (34 kPa) tensile strength / Passed
5. Water Resistance / ASTM D-2247 / No deleterious effects* at 14 day exposure / Passed
6. Salt Spray Resistance / ASTM B-117 / No deleterious effects* at 300 hour exposure / Passed
7. Abrasion Resistance / ASTM D968 / No cracking, checking, or loss of film integrity at 1,057 quarts (1,000 L) of sand / Passed
8. Mildew Resistance / ASTM D-3273 / No growth supported during 28 day exposure period / No growth at 42 days
* No deleterious effects: no cracking, checking, crazing, erosion, rusting, blistering, peeling or delamination.
B. System Performance Fire
TEST / METHOD / CRITERIA / RESULT2. Intermediate Scale Multi-Story Fire Test / UBC Standard 26-8 / 1. No flame propagation beyond the area of flame plume impingement on the exterior face of the wall assembly
2. No flame propagation (either vertically or
laterally) through the core components
3. No flame propagation laterally through the core components in the first floor area
4. No excessive temperature rise in the second floor room, measured 1 in (25 mm) away from the wall assembly
5. No flame propagation within the second floor room / Passed
3. Fire Endurance / ASTM E-119 / No effect on fire resistance rating of wall assembly / Passed
4. Radiant Heat Ignition / 1993 National Building Code Section 1406.0 / No ignition at 20 minutes / Passed
1994 Standard Building Code, Section 2603.5 / No ignition at 20 minutes / Passed
C. System Performance - Structural
TEST / METHOD / CRITERIA / RESULT1. Impact Resistance / EIMA 101.86 / a. Standard: 25-49 in-lbs
(2.83-5.54J) / Achieved: one layer of Sto Mesh
d. Ultra-High: Over 150 in-lbs
(17.1 J) / Achieved: one layer of Sto Armor Mat and one layer of Sto Mesh
2. Wind Load / ASTM E-330 / Withstand negative and positive wind loads required by prevailing building code / +173, -68 PSF*
(+8.28, -3.25 kPa)
* Ultimate load capacity. Apply appropriate safety factor. Values also depend on sheathing type and fastening pattern, and structural wall system stiffness [stud size/spacing/depth] Also see applicable code report.
D. Component Performance Durability
TEST / METHOD / CRITERIA / RESULT1. Alkali Resistance of Reinforcing Mesh / EIMA 105.01 / Greater than 120 pli (21dn/cm) retained tensile strength / Passed
2. Physical Properties and Requirements for Mineral Fiber Block and Board Thermal Insulation / ASTM C-612 / Meet Class 4 requirements / Passed
E. Component Performance – Fire
TEST / METHOD / CRITERIA / RESULTSurface Burning / ASTM E-84 / Adhesive, insulation board, reinforced base coat, and finish coat each have a flame spread of 25 or less and smoke developed of 450 or less / All components passed
1.06 SUBMITTALS
A. Manufacturer's specifications, details, installation instructions and product data
B. Applicator's certificate of instruction.
C. Samples for approval as directed by architect or owner.
D. Manufacturer's code report.
E. Manufacturer's standard warranty.
F. A list of minimum three (3) job references.
G. Sealant Manufacturer's certificate of compliance with EIMA Standard 300.01.
H. Prepare and submit projectspecific details (when required by contract documents).
1.07 QUALITY ASSURANCE
A. Manufacturer requirements
1. Member in good standing of the EIFS Industry Members Association (EIMA).
2. System manufacturer for a minimum of fifteen (15) years.
3. System recognized for intended use by the national codes and by the local code agency with jurisdiction over the project.
B. Contractor requirements
1. Engaged in application of Class PB EIFS 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 Class PB EIFS 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 agreement with Sto.
2. Label insulation board with information required by Sto and the applicable building code.
1.08 DELIVERY, STORAGE AND HANDLING
A. Deliver all EIFS 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 90o F (32o 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.
1.09 PROJECT/SITE CONDITIONS
(Weather conditions affect application and drying time. Hot or dry conditions limit working time and accelerate drying and may require adjustments in the scheduling of work 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)
A. Maintain ambient and surface temperatures above 40o F (4o C) during application and drying period, minimum 24 hours after application of EIFS.
B. Provide supplementary heat for installation in temperatures less than 40oF (4o C).
C. Provide protection of surrounding areas and adjacent surfaces from application of materials.
1.10 COORDINATION/SCHEDULING
(The work in this section requires close coordination with related sections and trades)
A. Install flashings, copings and sealant immediately after installation of the system and when EIFS coatings are dry.
1.11 WARRANTY
A. Provide manufacturer's standard labor and material warranty.
PART 2 PRODUCTS
2.01 MANUFACTURERS
A. Sto Corp.
B. Roxul, Inc.--Milton, Ontario (mineral wool insulation board)
C. Provide EIFS components from single source EIFS manufacturer or approved supplier.
2.02 SURFACE PREPARATION
A. Conditioner
1. Sto Plex W ¾ an acrylic-based surface conditioner (used for chalking surfaces or excessively absorptive concrete, plaster or masonry).
B. Leveler
1. BTS-Plus ¾ one-component, polymer-modified, cement-based leveler (used for concrete, or plaster surfaces; for leveling up to 1/8 inch {3.2 mm}).
2. Sto Leveler ¾ one-component, polymer-modified, cement-based leveler (used for concrete, masonry or plaster surfaces; for leveling up to 1/4 inch [6 mm]).
2.03 ADHESIVES (select one based on substrate/job condition)
A. Sto Dispersion Adhesive ¾ noncementitious, acrylic-based adhesive.(for use over exterior gypsum sheathing, Dens Glass Gold, Exterior Grade or Exposure I wood-based sheathing, exterior cementitious sheathing, concrete, masonry or plaster surfaces. Not recommended over damp or irregular surfaces or during prolonged periods of cold weather. Not recommended over pressure-treated or fire-retardant treated wood surfaces).
B. Sto BTS-Plus ¾ one-component, polymer-modified, cement-based adhesive (for use over Exterior gypsum sheathing, Dens Glass Gold sheathing, Exterior cementitious sheathing, concrete, masonry or plaster surfaces. Not recommended over wood surfaces).
C. Sto Flexyl ¾ fiber-reinforced, acrylic-based adhesive mixed with Portland cement (for use as a waterproof adhesive).
2.04 INSULATION BOARD
A. Nominal 6.0 lb/cu ft (96 kg/m3) mineral wool insulation board in compliance with ASTM C-612 Class 4 requirements. Fiber orientation shall be perpendicular to the length and width of the board.
B. Nominal 2.0 lb/cu.ft. (32 kg/m3) Expanded Polystyrene (EPS) Insulation Board, or nominal 2.0 lb/cu.ft. (32.0 kg/m3) Rigid, Extruded Polystyrene (XEPS) Insulation Board, in compliance with ASTM C-578-87a, Type IV requirements.