Specification for ArcusStonecoat? Cast & Pre-Coated EPS Foam Shapes
SECTION 06 60 00
This specification encompasses basic requirements for manufactured ArcusStonecoat? pre-coated EPS foam core
architectural shapes manufactured to simulate natural cut stone used in masonry applications. These shapes consist of precut EPS foam cores that are coated with a thickness of ArcusStonecoat limestone finish material through an extrusion, encapsulation or poured mold process.
This specification also includes some requirements for full cast ArcusStone panels, pieces and shapes. Refer to the ArcusStone Application Manual for other requirements related to the casting or coating of shapes using ArcusStone materials.
PART 1 GENERAL
1.01 SECTION INCLUDES – ARCUSSTONECOAT PRECOATED EPS FOAM AND CAST SHAPES
Scope - All labor, materials, and equipment to provide the ArcusStonecoat precoated EPS foam or cast shapes shown
on architectural drawings and as described in this specification.
A Manufacturer shall furnish ArcusStonecoat pre-coated EPS foam or cast shapes covered by this specification.
B Installing contractor shall unload, store, furnish all anchors, set and patch the ArcusStonecoat pre-coated EPS
foam or cast shapes as specified.
1.02 RELATED SECTIONS
Section 01 34 00 Submittal Procedures
Section 07 24 00 Exterior Insulation and Finish Systems
Section 07 90 00 Joint Protection / Sealers
1.03 REFERENCE STANDARDS
ASTM C 578 Standard Specifications for Preformed Polystyrene Thermal Insulation
ASTM C 494 / C 494M Standard Specification for Chemical Admixtures for Cementitious Materials
ASTM C 1666 / C1666M Standard Specification of Alkali Resistant (AR) Glass Fiber for GFRC and Fiber Reinforced
Concrete and Cement
ASTM C 932 Standard Specification for Surface-applied Bonding Compounds for Cementitious Materials
ASTM A 641 Specification for Zinc-Coated (Galvanized) Carbon Steel Wire
EIMA 101.01 Standard Test Method for Freeze-Thaw Resistance of Exterior Insulation and Finishing Systems (EIFS),
Class PB (Modified ASTM C67)
EIMA 105.01 Standard Test Method for Alkali-Resistance of Glass Fiber Reinforcing Mesh for use in Exterior Insulation
and Finishing Systems (EIFS)
California SCAQMD Rule 1113-90 Architectural Coatings
ArcusStone Products LLC Application and Technical Manuals (current editions)
ArcusStonecoat Pre-coated EPS Foam Shape – A refined architectural detail unit manufactured to simulate natural cut stone used in masonry applications. They are manufactured using one of the following three general methods:
1. Extruded Units – manufactured using a low slump ArcusStonecoat mix, with either a stationary
push box or movable screed sled employed to apply the mix to an EPS core that has had
ArcusStone Re-emulsifying Bonding Agent (a chemical bonding agent complying with ASTM C932
and ArcusStone Products LLC requirements) applied to the core surfaces to receive the
ArcusStonecoat material, OR; has had open weave glass fiber fabric applied, weighing a minimum
of 3.5 oz/sq. yd. (118g/m2) and conforming to EIMA Standard105.01, and embedded in a
lightweight polymer-modified cementitious adhesive / basecoat to a minimum thickness of 1/8”
(3.125 mm), to EIMA Standard 101.01.
2. Poured EPS Mold Units – manufactured using a high slump ArcusStonecoat mix with a high range
water reducer / plasticizer conforming to ASTM C 494 / C 494M, and minimally vibrating the mix
into an EPS mold to attain denser consolidation of the mix.
3. Embedded / Encapsulated EPS Core Units – manufactured using a standard slump
ArcusStonecoat mix poured into the bottom of EPS, rubber, or other molds, with EPS core
shapes positioned in the molds and additional ArcusStonecoat material poured into the voids
around the foam cores. The molds are vibrated, and then a ?” minimum thickness of
ArcusStonecoat or fiber reinforced, acrylic modified Portland cement plaster is screeded over the
exposed EPS core backs, completing the encapsulation of the foam cores.
EPS Foam Core: Rigid, expanded polystyrene (EPS) foam conforming to the physical properties of ASTM C578. Minimum Type I 1.0 lb/cu.ft. (17.0 kg/m3) density. Minimum Type IX 2.0 lb. / cu. ft. (34.0 kg/m3) required for flat panels and shapes exceeding a 15 to 1 ratio of length to average thickness. EXAMPLE: window sill profiles that are to be produced in 24 inch lengths x 4-1/2 inch widths by average thickness of 2 inches, would be required to use Type IX 2.0 lb. / cu. ft. (34.0 kg/m3) density foam cores.
ArcusStonecoat?: ArcusStone Products LLC decorative limestone finish material that is a lightweight (3 lb/sq. ft.
@3/8” thickness), polymer reinforced Portland cement based mix with a minimum thickness of 3/8”.
Alkali Resistant (AR), High dispersing (HD) Chopped Glass Fiber: a glass fiber product that is resistant to the alkali conditions that exist in matrices such as those based on Portland cement, and that are used for reinforcement of cement, mortar, and concrete products
ArcusStone Re-emulsifying Bonding Agent: a Vinyl Acetate Monomer Resin Compound bonding agent in compliance with ASTM C 932, used to provide a chemical bond between EPS core and ArcusStonecoat
Reinforcing Mesh: open weave glass fiber fabric applied, weighing a minimum of 3.5 oz/sq. yd. (118g/m2) and conforming to EIMA 105.01
Adhesive / Basecoat: an EPS foam compatible polymer modified cementitious material mixed per manufacturer’s recommendations, used to attach the ArcusStonecoat Pre-coated EPS Foam Shapes to an approved substrate and to provide embedding coat for reinforcing mesh, conforming to EIMA 101.01
Mechanical Fasteners: anchors, dowels, screws, and other non-corrosive devices used in conjunction with adhesives to attach the ArcusStonecoat Pre-coated EPS Foam Shapes to an approved substrate
Approved Substrate: surface where ArcusStonecoat Pre-coated EPS Foam Shapes can be attached
1.05 SUBSTRATE AND DESIGN LIMITATIONS / REQUIREMENTS
1 The substrate shall be flat to within ?” (6.4mm) in a 5 foot (1.5m) radius, and shall have a maximum allowable
deflection of the substrate system under Code specified load conditions which does not exceed L/360.
2 Expansion and control joints are required in the ArcusStonecoat Pre-coated EPS Foam Shapes where they
occur in the underlying substrate.
3 Shapes can be applied to the following approved substrates:
a Clean, structurally sound Portland cement plaster (stucco)
c Poured concrete, free of any surface contaminants that would interfere with a good bond
d Unit masonry, stone veneer, or tile that is sound and adhered properly
e Properly installed exterior gyp sheathing, cement board, and cementfiber board /
Note: Consult an ArcusStone technical representative for a review and approval of substrates not listed above.
1. The Manufacturer of ArcusStonecoat coated EPS shapes, panels, extrusions, coated shapes and castings is
solely responsible for the proper engineering and design of the pieces.
2. A minimum density of Type IX 2.0 lb. / cu. Ft. (34.0 kg / m3) is REQUIRED for all flat panels and other shapes
that meet or exceed a ratio of 15 to 1 length to average thickness. EXAMPLE: window sill profiles that are to
be produced in 24 inch lengths x 4-1/2 inch widths by average thickness of 2 inches would be required to use
Type IX 2.0 lb. / cu. ft. (34.0 kg/m3) density foam cores.
3. Complete encapsulation of the EPS core with ArcusStonecoat, or fiber reinforced acrylic modified Portland
cement plaster, is REQUIRED for flat panels and other shapes that meet or exceed a 15 to 1 ratio length to
average thickness. The facing and sides or edges of all encapsulated pieces are to be covered with a
minimum 3/8” thickness of ArcusStonecoat. The back of such pieces or panels shall have a ?” minimum
thickness of ArcusStonecoat, or fiber reinforced acrylic modified Portland cement plaster, covering the surface. 4. It is REQUIRED that any pieces, panels and shapes having an average thickness of 1 inch or less shall be full
cast, i.e. EPS foam cores or other material shall not be used as part of the manufactured piece, panel, or
5. All cast, coated, extruded, poured, and otherwise manufactured panels, pieces and shapes are REQUIRED to
be manufactured using integral, alkali resistive, high dispersing, chopped glass fibers of ?” (6 mm) in length.
6. All cast, coated, extruded, poured, and otherwise manufactured panels, pieces and shapes are REQUIRED to
be manufactured using either the ArcusBooster or ArcusAdMix additives in the proper dosages and for the
recommended usage as given in the ArcusStone Application Manual.
7. All cast, coated, extruded, poured, and otherwise manufactured panels, pieces and shapes are REQUIRED to
be cured a MINIMUM of 14 days, using techniques such as covering the pieces with poly sheeting to promote
adequate and proper curing.
8. All cast, coated, extruded, poured, and otherwise manufactured panels, pieces and shapes are REQUIRED to
be sealed at the manufacturing facility prior to shipping using ArcusStone’s Penetrating Water Repellant or
other approved penetrating, water proofing sealer. Do not apply any sealer before the pieces have achieved a
minimum of 48 hours cure after de-molding, casting, or coating with ArcusStonecoat.
1.06 QUALITY ASSURANCE
A. Manufacturer Qualifications:
1. Manufacturer shall have sufficient plant facilities to produce the shapes, quantities, and sizes of
ArcusStonecoat Pre-coated EPS Foam Shapes required in accordance with project schedule. 2. Manufacturer shall submit a list of projects similar in scope and at least two (2) years of age, along with Owner,
Architect, and Contractor references.
3. Manufacturer shall be an ArcusStone Authorized Manufacturer, as approved by ArcusStone Products LLC.
B. Standards: Manufacturer shall comply with the requirements of ArcusStone Products LLC Technical and
Application Manuals, the project specifications, contract documents, and all applicable local codes. C. Mock-up: Provide full size unit(s) for use in construction of sample wall. The approved mock-up shall become the
standard for appearance and workmanship for the project. Maintain accepted mock-up(s) until substantial
completion of the work. Mock-up may become part of the completed work.
A. Comply with Section 01 34 00 – Submittal procedures.
B. Submit shop drawings including dimensioned profiles, cross sections, tolerances, ornamentation, reinforcement,
exposed faces, arrangement of joints, attachment methods, and anchors (where required).
C. Samples: Prior to start of project, provide 1’ (.25m) long pieces of each shape, demonstrating the general range of
variations in detail and color that are expected. Samples are to be clearly labeled with manufacturer’s logo and
other identification markings.
1.08 DELIVERY, STORAGE, AND HANDLING
A. Package shapes to protect them from staining or sustaining other damage during shipping and storage. B. Mark shapes with identification marks as shown on shop drawings, and with manufacturer’s labels intact and
C. Store shapes on site in a cool, dry location, out of direct sunlight and weather. Store in such a manner as to
prevent cracking, distortion, staining, warping, or other physical damage.
D. Provide an itemized list of product to support the Bill of Lading.
1.09 PROJECT CONDITIONS
A. Weather and Environment: Comply with adhesive manufacturer’s guidelines and installation instructions.
B. Wall surface and ambient air temperature shall be at least 40º F (4º C), and rising, during the installation of the
ArcusStonecoat Pre-coated EPS Foam Shapes.
Wall surfaces and ambient air temperatures must remain above 40º F (4º C) for a minimum of 48 hours after
Do not adhesively attach pieces if ambient and / or substrate temperatures are over 100º F.
Do not install pieces on wet or frozen substrates.
C. Protection: Supplemental heat shall be provided for installation where temperature is less than 40º F (4º C).
Measures should be taken to prevent condensation and / or heat build-up when tarps and plastic sheeting are used
to protect the work and provide additional heat.
Maintain protection and supplemental heat for a minimum of 48 hours after installation.
D. Protect open joints from water intrusion during construction, using tarps or other means.
1.10 SEQUENCING AND SCHEDULING
A. ArcusStonecoat Pre-coated EPS Foam Shapes installation should be coordinated with other work to minimize
delays and facilitate proper installation of the shapes.
B. Cover shapes immediately to prevent water infiltration behind units.
C. Install joint sealant as soon as possible after shapes are installed.
D. Install sealer as soon as possible after joint sealant, following sealer manufacturer’s recommended procedure for
installation and protection during cure.
PART 2 PRODUCTS
2.01 ACCEPTABLE MANUFACTURERS
Contact ArcusStone Products LLC, 180 Harbor Drive, Suite 200, Sausalito, CA, (415) 339-4060, firstname.lastname@example.org, for a current list of ArcusStonecoat Pre-coated EPS Foam Shapes authorized manufacturers, or to verify that a manufacturer is recognized as an authorized manufacturer.
A. Foam Core: Expanded Polystyrene (EPS) conforming to physical properties of ASTM C578 Type I, Type VIII, Type
II, or Type IV, depending on specifications and contract documents
B. ArcusStonecoat?: ArcusStone Products LLC crushed limestone finish material that is a lightweight (3 lb/sq. ft. @
3/8” thickness), polymer reinforced Portland cement based, with a minimum applied thickness of 3/8”
C. ArcusStone Re-emulsifying Bonding Agent: a Vinyl Acetate Monomer Resin Compound bonding agent in
compliance with ASTM C 932 used to provide a chemical bond between EPS core and ArcusStonecoat D. Reinforcing Mesh: glass fiber open weave fiber fabric treated for compatibility with cementitious materials
conforming to EIMA 105.01, 3.5 oz / sq. yd. (118g/m2)
E. Adhesive / Basecoat: polymer modified cementitious material used as a basecoat for EIFS, and as an adhesive for
attaching shapes to acceptable substrates, conforming to EIMA 101.01
F. High Range Water Reducer / Plasticizer: liquid admix conforming to ASTM C 494 / C 494M, used in the
ArcusStonecoat mix when manufacturing ArcusStonecoat Pre-coated EPS Foam Shapes using EPS molds G. 1/4” AR (Alkali resistive) HD (high dispersion) chopped glass fibers confirming to ASTM C1666 / C1666M
2.03 MISCELLANEOUS MATERIALS
A. Embedded or Inserted Attaching Hardware: members integrated into the shapes for purposes of attachment that
are not visible on the finished surfaces, complying with ASTM A 641
B. Form / Mold Release Agents: liquid release agents suitable for expanded polystyrene molds that meet or exceed
California SCAQMD rule 1113-90
C. Defoamers: hydrophobic, non-silicone based powdered agents that may be added to the ArcusStonecoat material
to densify it and promote a smooth finish without bug holes and pin holes
A. Fabricate ArcusStonecoat Pre-coated EPS Foam Shapes with a minimum thickness of 3/8” (9.75mm) of
ArcusStonecoat material on all finished, exposed surfaces. Important! Some designs may require a thicker
minimum coating and / or complete encapsulation of the foam cores.
B. Encapsulate back side with minimum ?” thickness of either ArcusStonecoat or Portland cement plaster where
required. Refer to Section 1.05 (B) for specifics on when encapsulation is required.
C. Fabricate using 4 ounces by volume (approx. 60 grams by weight) of ?” AR (alkali resistive) HD (high dispersing)
chopped glass fibers per 50 lb. ArcusStonecoat mix, sprinkling the fibers into the mix while blending. DO NOT
PLACE FIBERS DIRECTLY IN MIX WATER PRIOR TO BLENDING THE MATERIAL. After all fibers and
ArcusStonecoat materials are wetted, continue to mix for 2 minutes, then follow normal mixing protocol, letting the
material take a false set then remixing for another 90 seconds.
D. Use a minimum of 2.0 lbs / cu. ft. density EPS foam where required. Refer to Section 1.05 (B) for specifics on
when 2.0 lb. foam is required.
E. Provide finished surfaces per specifications and contract documents, repairing voids, scratches, and hollows as
F. Fabricate ArcusStonecoat Pre-coated EPS Foam Shapes to the dimensional tolerances as follows:
1. Thickness: +/- 1/8” (3.2mm)
2. Squareness: not to exceed ?” (6.4mm) difference between diagonals in 16 sq. ft. (1.48 m2)
3. Edge Straightness: +/- 1/16” (1.6mm)
4. Joint Edge: +/- 1/8” (3.2mm)
5. Planes Surface Straightness: +/- 1/8” (3.2mm)
6. Overall Assembled Length and Width: +/- 1/8” (3.2mm) per 10’ (3m)
7. Chords, Radiuses, and Diameters: +/- 1/8” (3.2mm)
8. 1/4” per foot minimum slope on horizontal surfaces, such as sills, parapets, cornices, wall caps and similar
2.05 PROPERLY CURE THE SHAPES
A. Initial Cure - If using molds to manufacture shapes, place the molds in a temperature and humidity controlled
environment for the initial 24 hours prior to de-molding.
Temperature should be 65º F to 85º F
Relative Humidity to be at least 20%
Cover the molds with plastic tarps or curing blankets during this period.
B. After de-molding or extruding – Place pieces on a FLAT, NON ABSORBANT surface, and complete any finishing
C. After finishing, store the pieces under plastic sheeting and cure for an additional minimum of 14 days while
protecting pieces from thermal shock, extreme heat, cold, sunlight or water splash.
PART 3 EXECUTION
A. Substrate shall be of an approved type, and shall be dry, free of dust, dirt, and any other contaminants that would
interfere with a good bond.
B. Substrate shall be free of planar irregularities greater than ?” (6.4 mm), in a 5’ (1.5m) radius.
Report unsatisfactory substrate conditions to the Contractor for correction prior to installation of the
A. ArcusStonecoat Pre-coated EPS Foam Shapes shall be installed plumb, level, true, and in alignment with adjacent
B. Install the ArcusStone Pre-coated EPS Foam Shapes to the following tolerances:
1. Joint Width: not to exceed 3/8” (9.5mm)
2. Joint Alignment: not to exceed 1/8” (3.2mm)
3. Deviation from Plane: +/- ?” (6.4mm) per 25’ (7.62m)
4. Deviation from Plumb: +/- 1/8” (3.2mm) per 10’ (3m)
5. Deviation from Plane and Alignment, Panel to Panel: 1/16”
C. Attach shapes using approved adhesive by applying the adhesive with a 3/8” notched trowel, creating vertical
ridges on the pre-dampened, clean, backside of the shape. Immediately place the shape after application of the
D. After adhering a piece to the substrate, apply more adhesive with a stainless steel trowel to a 3/16” thick coating on
the butt-ends, and to within approx. ?” from the finished face, then adhere the next piece adjacent, and the next
until complete, then brace the pieces for the time designated by the adhesive manufacturer until the adhesive has
achieved sufficient cure.
E. Do not use pneumatic guns to attach fasteners. Do not run fasteners through finished surfaces of shape. F. Install approved joint sealant. Tool the sealant as needed to achieve the specified profile.
END OF SECTION