STONEWALL PRODUCTS

I. Subject: STONEWALL ONE-COAT STUCCO SYSTEM.
II. Description:

A. General: The STONEWALL ONE-COAT STUCCO SYSTEM is a proprietary mixture of portland cement, sand, glass fibers and proprietary ingredients reinforced with wire fabric or metal lath and applied to substrates of expanded polystyrene (EPS) insulation board, gypsum sheathing board, fiberboard or plywood. The system is installed on exterior walls of wood or steel stud construction. STONEWALL ONE-COAT STUCCO may also be applied directly to concrete or masonry surfaces.

B. Materials:

STONEWALL ONE-COAT STUCCO: A factory prepared mixture of Type I, II, or III portland cement complying with U.B.C. Standard 19-1 (PartI), Type E glass fibers and proprietary additives. The mixture is packaged in 80-pound bags. Four and one-half to 6 gallons of water and 160 to 280 pounds of sand are added to each bag in the field and mixed accordance with the manufacturer's recommendations. Approved color pigments may be added to the stucco mix in accordance with the manufacturer's instructions.

Sand: Must be clean and free from deleterious amounts of loam clay, silt, soluble salts and organic matter. Sampling and testing must comply with either ASTM C-144 or C-897. Sand must be graded in accordance with either ASTM C-144 or C-897 within the following limits.

Retained on U.S. Standard Sieve	Percent Retained by Weight ą 2 Percent
	Min.	Max.
No. 4	------	0
No. 8	0	10
No. 16	10	40
No. 30	30	65
No. 50	70	90
No. 100	95	100

Insulation Board:
1. Expanded Polystyrene (EPS) Insulation Board: This board had a Class 1 flame-spread rating and a smoke-developed rating not exceeding 450. Unbacked boards are 1 to 11/2 inches-thick and have 3/8-inch-high tongues with compatible grooves for horizontal joints. See Figure 1 for joint detail. All boards must have recognition in an evaluation report issued by ICBO ES or the National Evaluation Service. See Section II H for board identification. The EPS board shall comply with one of the following requirements: 1. Minimum nominal 1.5 pcf density as described in the applicable cable evaluating report
2. Fome-Cor Board is described in Evaluation Report No. 3335.
Lath:
1. Wire Fabric Lath: Minimum No. 20 gage. 1 inch galvanized steel woven-wire fabric. Lath must be selffured or furred when applied over all substrates except unbacked polystyrene board. Self-furring lath for coatings must comply with the following requirements: 1. The maximum total coating thickness is 1/2 inch. 2. Furring crimps must be provided at maximum 6 inch intervals each way. The crimps must fur the body of the lath 1/8 inch minimum from the substrate after installation.
2. Metal Lath: Complies with Table-25-B of the code furring and self-furring requirement are as set forth for wire fabric lath.
Gypsum Sheathing Board: Water-resistant core gypsum sheathing complying with ASTM C 79-82 (a).
Fiberboard: Minimum 1/2 inch-thick asphalt-impregnated fiberboard complying with ANSI/AHA A 194. 1-1985 as a regular density sheathing.
Plywood: Minimum 5/16-inch-thick plywood with exterior glue for studs spaced 16 inches on center and minimum 3/8-inch-thick plywood with exterior glue for studs spaced 24 inches on center, plywood complies with U.B.C. Standard 23-2.
Caulking: Acrylic latex caulking material complying with ASTM C 834, such as DAP acrylic latex No. 11465.
Weather-resistive Barrier: Minimum Grade D Kraft building paper complying with U.B.C. Standard 14-1 or asphalt-saturated rag felt complying with Underwriters Laboratories Standard Specification 55-A 1983. The weather-resistive barriers required over all substrates expect for EPS board where the barrier may be behind the board. Application of the barrier complies with Section 1402.1 of the code. When applied over any wood-based sheathing, the barrier must be minimum two layers of Grade D building paper as set forth in Section 2506.4 of the code.
Fibers: One-half-inch-long Type E or AR glass fibers, and/or 3/16-1/2 inch polypropylene/polyester fiber for short-tam benefits during initial curing.
Admixtures: 1. Proprietary ingredients included to improve quality of coating mixture.
Miscellaneous: All trim, screed and corner reinforcement must be galvanized steel or approved plastic.

C. Installation:

General: The exterior cementitious coating is applied by hand trowelling or machine spraying in one application to a minimum 3/8-inch thickness. The lath must be embedded in the minimum coating thickness and therefore cannot be exposed. The finish coat, whether stucco or water based paint may be applied after 48 hours curing. Fasteners for lath must penetrate 1 inch minimum into wood framing (included plywood or OSB shear paneling when present). Flashing, comer reinforcement, metal trim and weep screeds must be installed as shown in attached details. See Figure 2. The coating is applied at ambient air temperatures ranging from 40° F. to 110° F. by applicators approved by STONEWALL Stucco and Lime Products, Inc. The weather-resistive barrier must be applied as set forth in Section II B-9. An installation card, as noted in figure 3, must be on the jobsite with the name of the applicator and the product to be used before any weather-resistive barrier or exterior sheathing is installed. Also, see Section IV 6 of this report.

Application Over Open Framing:
a: Insulation Board: the weather-resistive barrier is placed over open wood studs spaced 24 inches on center, maximum. The EPS board described in Section II. B-3, is then placed horizontally with tongues faced upward and is temporarily held in place with galvanized staples or roofing nails. Vertical butt joints must be staggered a minimum of one stud space from adjacent courses and occur directly over studs. The lath is then applied tightly over the polystyrene board and fastened through the board to wood studs with No. 11 gage galvanized roofing nails or No. 16 gage galvanized staples spaced 6 inches on center with a minimum 1 inch penetration into wood species with a specific gravity of 0.50 or greater per Table 23 III-F.F. of the code. For wood species with specific gravity of less than 0.50 fastener spacing may be reduced to 4" on center. Staples must have a minimum crown width of 1/2 inch. Stapling is permitted only in wood species with specific gravity 0.50 or greater per Table 23 III-FF of the code. Care must be taken to a void overdriving fasteners. STONEWALL One-Coat Stucco Systems may also be applied to steel studs spaced 24 inches on center, maximum. Stud thickness must be minimum No. 20 (0.035 inch minimum) gage. The lath is applied tightly over the polystyrene board and fastened through the board and weather-resistive barrier to the metal studs with No. 7s112-20 long self-tapping self-drilling panhead screws spaced 6 inch on center. Screw head diameter is 0.333 inch minimum. The screws must be long enough to penetrate the studs 1/4 inch, with a 1-1/4 inch minimum length. The lath is applied with 1-1/2-inch laps at all joints. wall bracing in accordance with Section 2326.11.3 of the code or acceptable alternate is required. Square wall corners and parapet corners are covered with metal corner reinforcement. For round wall and parapet corners, metal reinforcement is optional when constructed according to Figure 4. Weep screeds are installed at the bottom of the wall in accordance with Section 2506.4 of the code. Galvanized steel 1-3/8 -inch J-shaped trim pieces are installed at other areas where foam is exposed. At windows and doors, butting J-shaped trim metal edges must be caulked. Holes for hose bibbs, electrical panels and other penetrations of substrate surfaces exceed those caused by fasteners must also be caulked. The coating is applied after caulking as described in Section II C-1.
b: Fome-Cor Board: The Fome-Cor Board is applied in accordance with Evaluation Report No. 335 to wood studs 16 inches on center maximum, following by 1-1/2-inch by No. 17 gage woven lath lapped 2 inches. The lath is secured through the Fome-Cor to the studs with No. 16 gage staples, 1-inch crown, of sufficient leg length to penetrate studs 1 inch minimum. The STONEWALL One-Coat is applied as described in Section II C-1 to a 1/2 to 5/8-inch thickness. When STONEWALL One-Coat is not applied to the full 5/8-inch thickness, a finish coat complying with Chapter 25 of the code must be applied to provide a 5/8-inch overall thickness. Additional installation requirements are as noted in Section II C-2 (a).

Application Over Solid Backing:
a. Fiberboard: Minimum I/2-inch-thick fiberboard sheathing is installed directly over wood studs spaced 16 inches on center, maximum. The fiberboard is temporarily held in place with corrosion resistant staples or roofing nails. A weather-resistive barrier of two layers of building paper, is applied over the fiberboard prior to lath or optional insulation board. The lath is then attached to studs through the sheathing with fasteners and spacing as described for insulation board in Section II C-2 of this report or Table 23-1Q of the code, whichever is more restrictive. When the lath is placed over optional insulation board the specified fastener length must be created by the insulation board thickness. The sheathing may also be applied to minimum No. 20 gage steel studs spaced 24 inches on center maximum. stud thickness 0.035 inch minimum. The fiberboard is temporarily held in place with self-taping screws followed by two layers of building paper, Self-fumng or furred lath is secured through the weather-resistive barrier and sheathing with No. 7S12-20 self drilling, self-tapping panhead screws spaced as for wood screws. When the lath is placed over optional insulation bond the specified fastener length must be increased by the insulation board thickness. Screw-head diameter is 0.333 inch, minimum. the screws must be long enough to penetrate the studs I/4 inch, with a 1-1/4 inch minimum length. All walls must be braced in accordance with the code. Exposed sheathing edges are protected with screeds. Holes in the substrate surface are caulked and the coating apphed as described in Section II C-l.
b. Gypsum: Sheathing: Minimum 1/2-inch-thick, water resistant core gypsum sheathing may be instaged directly on wood studs in a manner similar to fiberboard. Gypsum sheathing is fastened in accordance with Table 25-G of the code. A weather- resistive barrier is required over the gypsum sheathing prior to installation of the lath and coating as described in Section II C-2, EPS insulation board 1/2-to 1-1/3-inch thick may be installed over the barrier prior to the lath and coating. The sheathing may be applied to minimum No. 20 gage studs spaced 24 inches on center, maximum. Stud thickness is 0.035 inch minimum. The gypsum sheathing is attached to metal studs with screws described in Section II C-3 at 6 inches on center. The weather- resistive barrier is temporarily fastened, followed by the self-furring or furred metal lath. The lath is attached through the sheathing to metal studs as set forth in Sectin II C-3 (a). Screws fastening sheathing and screws fastening lath must be staggered from each other.
c.Plywood: Plywood is applied directly to wood studs under conditions set forth in Section II B-7 of this report and Table 23-I-N-1 of the code. The weather-resistive barrier, wire fabric lath and coating are applied as described for fiberboard.
d.Concrete and Masonry: Surfaces shall be clean, free of dust or other particles and sufficiently damp to assure a proper bond. The stucco is applied directly to the prepared surface at a minimum 3/8 inch thickness in accordance with applicable provisions of Section II C-l.

D: One-hour Fire-reristive Assembly:

a. Interior Face: One layer of 5/8-inch thick Type X gypsum wallboard, water-resistant backer board or veneer base is applied parallel or at right angles to the interior face of 2 by 4 wood studs spaced 24 inches on center maximum. The wallboard is attached with 6 d coated nail 1-7/8 inches long with a 1/4-inch diameter head, at 7 inches on center to studs, plates and blocking. All wallboard joints must be backed with minimum 2 by 4 wood framing and taped and treated with joint compound. Fastener heads must also be treated with joint compound.
b. Exterior Face: One layer of minimum 5/8-inch-thick Type X water-resistant core treated gypsum sheathing 48 inches wide is applied parallel to studs with No. 11 gage galvanized roofing nails 1-3/4 inches long with 7/1'6-inch-or 1/2-inch- diameter heads at 4 inches on center at board edges and 7 inches on center at intermediate studs. The sheathing is nailed to top and bottom plates at 7 inches on center. A weather-resistive barrier is required over the sheathing. The wire fabric lath and wall coating are then applied as described in Section II C-3 (b).
a. Interior Face: One layer of 1/2-inch-thick Type X gypsum wallboard manufactured by Centex-American Gypsum Company identified as Fire Bloc II is applied vertically to the interior face of 2 by 4 wood studs spaced 16 inches on center, maximum. The wallboard is attached with nails and spacing as set forth in Table 25-G of the code except the minimum length must be 1-1/2 inches. All wallboard joints must be backed by minimum 2 by 4 framing. Nailing is applied to wall studs, plates and blocking with nails staggered at joints. Joints are then taped, and as with the nail heads, covered with a joint compound.
b. Exterior Face: One layer of minimum regular I/2 inch water-resistant core gypsum sheathing is applied horizontally to studs with No. 11 gage galvanized roofing nails with a minimum length of1-1/2 inches at 8 inches on center along all edges studs and plates. Prior to installation of the gypsum sheathing, cavities in the wood framing are filled with R-11 unfaced fiberglass insulation batts with a 0.6 pound per cubic foot density. The gypsum sheathing is then covered with a nonasphaltic-saturated weather barrier such as Kraft building paper complying with U.B.C. Standard 14-1. The wire fabric and wall coating are then applied as described in Section II C-=3 (b) except that no EPS insulation board may be applied over the sheathing.
a. Interior Face: Type X gypsum wallboard, 5/8 inch thick, is applied horizontally to the interior face of minimum 2 by 4 wood studs spaced 16 inches on center, maximum. The wallboard is attached to the studs with 5d gypsum wallboard nails at 6 inches on center along plates and studs at board edges and intermediate location. Minimum R-13 mineral wool or fiberglass insulation batts, 3-5/8 inches thick, are fitted between and fastened to studs. All wallboard joints must be blocked by 2 by 4 wood framing, taped an treated with joint compound. Fastener heads are treated with joint compound.
b. Exterior Face: Polystyrene board, 1 inch thick. 1.5 pcf density is applied to studs and temporarily fastened as described in Part II C-2 (a). One inch by No. 20 gage wire lath is then applied over foam plastic and fastened wit NO. 11 gage galvanized nails, 2 inches long, with 3/8-inch-diameter heads. Nail spacing is 6 inches on center to studs and plates. Lath is lapped 2 inches minimum. The STONEWALL One-Coat coating is applied as set forth in Part II C-l.

E. Noncombustible construction:
The stucco system may be installed on exterior walls required to be noncombustible construction as follows.

Interior Finish: One layer of 5/8-inch-thick Type X gypsum wallboard complying with ASTM C 36 is applied vertically to steel framing with all edges blocked. Fasteners are No 8 by 1-1/4-inch-long buglehead screws fastened to board joints at 8 inches on center and intermediate locations at 12 inches on center. All joints are taped and treated with joint compound. Intermediate fasteners are treated with compound.
Steel Framing: Minimum 3-5/8-inch-deep minimum NO. 20 gage steel studs (0.035 inch thick) spaced 16 inches on center minimum.
Openings: Wall openings are framed with minimum 0.125-inch-thick channel aluminum or steel framing.
Exterior Finish: One layer of minimum 1/2-inch-thick gypsum sheathing complying with ASTM C 79 is applied horizontally to the steel Framing with no. 8 by 1-1/4-inch-long buglehead screws spaced 8 inches on center at all framing locations.
Stud Cavity: Where exterior wall studs continue past floor levels, fire-stopping must be placed between studs at each floor. The accepted fire-stopping material is Thermafiber Insulation (Evaluation Report No. 2331). The insulation has a minimum nominal 4 pound per cubic foot density, is 4 inches thick and is approximately 6 to 8 inches wide. To fit between a stud cavity, it must be long enough to achieve a friction fit.
Stucco System: Stucco system includes application of one layer of Pyro-Cure 600 vapor retarder manufactured by Fortifiber. Pyro-Cure vapor retarder has a maximum flame spread of 25, a maximum smoke-developed rating of 30 and qualifies as a Type 1, Grade A weather-resistive barrier in accordance with U.B.C. Standard 14-1. The vapor retarder is installed over the sheathing in accordance with Section 1402.1 of the code. Expanded polystyrene insulation board with a nominal 1.5 pound per cubic foot density is installed at 1 inch thickness horizontally in running bond to the sheathing. Reinforcement consists of 1 inch by No. 20 gage galvanized steel self-furring woven-wire fabric lath. The lath, insulation board and vapor retarder are positively fastened to the steel framing using No. 8 by 2-1/3-inch long waferhead self-drilling screws spaced at 8 inches on center to all framing members. The stucco is applied at a 3/8 inch minimum thickness in accordance with Section II C of this report.

F. Miscellaneous:

Inspection Requirements: Building department inspection is required on lath installation prior to application the coating as noted in Section 108.5.5 of the code.

Control Joints: Control joints must be installed as specified by the architect, designer, builder or exterior coating manufacturer in that order. In the absence of details, conventional three-coat plastering details must be used.

Curing: Moist curing required for 24 hours after coating application, and should begin after STONEWALL ONE-COAT stucco has set (approximately 3-4 hours, depending upon weather conditions).

Soffits: The system may be applied to soffits, provided the coating is applied over metal lath complying with table 25-B of the code in lieu of wire fabric lath. Metal lath fastening must comply with Table 25-C, except the length must be increased by the thickness of any substrate.

Sills: The system may be applied to sills at locations such as windows and other similar areas. Sill depths 6 inches or less may have the coating and lath applied to any substrate permitted in this report, provide the coating, lath, weather- resistive barrier and substrate are installed in accordance with the appropriate section of this report. Sill depths exceeding 6 inches must have substrates of solid wood or plywood. The substrate is fastened in accordance with Table 23-I-Q of the code, over which a double layer of a complying weather-resistive barrier is applied. The coating, lath, and optional EPS board ate applied in accordance with Section II C-2 of this report.

H. Identification:
The factory-prepared mix is delivered to the jobsite in water-resistant bags with labels bearing the following information:

Name and address of manufacturer and evaluation report number.
Identification of components.
Weight of packaged mix.
Storage instruction.
Maximum amount of water and other components that may be added and conditions that must be considered in determining actual amount.
Curing instruction Polystyrene foam plastic insulation boards are identified in accordance with their respective ICBO ES or NES evaluation reports. Additionally, the board density must be noted. When applied to walls required to be non-combustible construction, each board along one edge add one board in each package on both faces must be identified with the foam plastic evaluation report number. STONEWALL ONE-COAT and Evaluatin Report NO.

III. Evidence Submitted: Data, in accordance with the ICBO ES Acceptance Criteria for Cementitious Exterior Wall Coatings dated April 1, 1994, and report of tests in accordance with U.B.C. Standard 26-4.

IV. Findings:
That the STONEWALL ONE-COAT STUCCO SYSTEM described in this report complies with the 1994 Uniform Building Code, subject to the following conditions:

The material and methods of installation comply with the report and the manufacturer's instructions.
Installation is by contractors approved by the manufacturer.
The system may be applied to walls required to be of noncombustible construction, in accordance with Section II E.
The system is recognized as a one-hour fire resistive assembly while complying with section II D of this report. Staples with equivalent holding power and penetration may be used as alternate fasteners to nails for attachment to wood framing.

The design stress for the system described in Section II D-1 is limited to 0.78 F'_c and the maximum stress may not exceed 0.78 F'_c at a maximum le/d ration of 33.

The loads applied to fire-resistive wall assemblies described in Section II D-2 may not exceed the following:

1,150 pound per stud.
Design stress of 0.78 F'_c in accordance with Section 2307.3 of the code
Design stress of 0.78 F'_c at a maximum le/d ration of 33.

1100 pounds per stud.
Design stress of 0.78 F'_c in accordance with Section 2307.3 of the code.
Design stress of 0.78 F'_c at a maximum le/d ration of 33.

The interior of the building is separated from the EPS board with a thermal barrier complying with
Section 2602.4 of the code, such as 1/2-inch regular gypsum wallboard applied in accordance with Table 25-G of the code.
An installation card, as shown in Figure 3, is left at the jobsite for the owner and a copy filed with the building department
The allowable wind load for systems installed over supports are as follows:

Systems installed over wood studs spaced 24 inches on center maximum: 35 psf.
Systems installed over No. 20 gage metal studs spaced 24 inches on center maximum: 41 psf.
Support framing must be adequate to resist the required wind load.