3-Part Specification for Installation of ARMOROC WALL SHEATHING

Standard Specification For
Installation of ARMOROC®
For Walls

Updated 10/24/08

SECTIONS 06100, 09250



A. Materials shall be ARMOROC PANEL™ Cement Bonded Particle Board (CBPB) as supplied by Ameriform, LLC or approved distributor.
B. All ARMOROC PANEL™ shall be selected from the manufacturer’s load tables to carry the project live load design over a maximum of 24 inches on center support spacing while limiting deflection to a maximum of L/240 as determined by project architect & engineer.
C. ARMOROC PANEL™ to be of minimum thickness ½” (12mm) and 4’ x 8’ (1220mm x 2440mm) dimension.
D. Comply with applicable building codes for wind, seismic, snow, uniformly distributed live-loads and other loading requirements as determined by the project architect and engineer.
E. ARMOROC PANEL™ shall have the following minimum mechanical properties:

1. Density: ±75 lbs/ft3
2. Modulus of Elasticity: > 652,000 psi
3. Shear Strength: > 1308 psi
4. Tensile Strength (parallel to surface): > 963 psi
5. Compressive Strength: > 2,938 psi


A. ARMOROC PANEL™ is a structural cement bonded particle board (CBPB) mechanically fastened to framing members as a substrate.
B. ARMOROC PANEL™ shall have a finish applied over it.


A. Surface burning characteristics: ARMOROC PANEL™ shall be Class A in accordance with ASTM E84 / UL 723 having achieved 0 flame spread and 0 smoke development indices in UL Sampled evaluation test.


A. Submit to the project architect or design professional a copy of ARMOROC PANEL™ product and installation specifications and one product sample measuring 3” x 3” minimum.


A. Contractor shall have successfully installed wall-sheathing products of a similar type as this project. These past projects shall have resulted in construction with a record of successful in-service performance.
B. At frequent intervals during construction, the job site may be visited by the owner’s representative, general contractor or construction manager to confirm that ARMOROC PANEL™ is being installed per this specification.


A. ARMOROC PANEL™, distributed Ameriform LLC, is normally delivered to site in factory crates bound with metal strapping, plastic sheet protection, cement-board edge protection, and dunnage to facilitate forklift handling.
B. ARMOROC PANEL™ shall be stored indoors on leveled dunnage not exceeding 32” on centers. If temporarily stored outdoors boards must be elevated above ground and protected from the weather with waterproof covering. Stacking of
pallets should always be on solid stable base and never be stacked higher than 5 pallets high. Acclimatize ARMOROC PANEL™ by storing on site not less than three days prior to installation.
C. All materials supplied by others shall be delivered and stored according to their instructions.
D. Deliver, store & handle materials to prevent breakage, warping or damage caused by moisture.

1. When transporting loose ARMOROC PANEL™ panels by truck they must be laid flat and fully protected against edge damage and protected from weather with waterproof covering.
2. When hand carrying single ARMOROC PANEL™ panel they must be carried on edge with the short side held ertically.

E. Damaged or deteriorated materials shall be removed from the premises.
F. Material Safety Data Sheets shall be available for all materials.


A. Framing to receive ARMOROC PANEL™ shall be structurally sound, free from bows, twists or other malformations and in general compliance with local building code requirements. Damaged framing shall be replaced before installation of ARMOROC PANEL™.
B. During installation of ARMOROC PANEL™ the temperature shall be at least 0º F during installation if mechanically fastened. Prior to the application of wall finishes ARMOROC PANEL™ must be conditioned at the same temperature as required for the wall finishes for at least 48 hours. Wall finishes shall not be applied over ARMOROC PANEL™ that is wet, frozen or contains frost.


A. Sequence the installation of ARMOROC PANEL™ with related work specified in other sections to ensure that the wall assemblies are protected against damage or abuse during and after construction.
B. Provide sufficient labor and equipment to properly install all materials.


A. ARMOROC PANEL™ is warranted by the manufacturer for a period of 10-years from date of material purchase to be free from defects in workmanship and materials under normal use. Refer to product warranty for complete terms.



A. Wall Framing: Shall meet local building code requirements for use in the wall system. Follow manufacturer’s installation instructions.
B. Wall Sheathing: Minimum 12mm (1/2″) thick ARMOROC PANEL™, as supplied by Ameriform LLC or approved distributor.
C. Fasteners: Use corrosion resistant, self-tapping, self-countersinking head screws such as Buildex “Rock On”. Fastener diameter shall be #8 minimum; fastener length shall be 2-1/2 to 3 times the board thickness. For wood studs use a Hi-Lo threaded fastener. Follow fasteners’ manufacturer’s installation instructions.



A. The wall framing and other framing components must be designed to meet the strength and deflection criteria as determined by project architect & engineer and specified in the contract documents.
B. The attachment flange or bearing edge shall be a minimum 2” wide, or doubled up at ARMOROC PANEL™ board edges.
C. Metal framing shall be a minimum 20 gauge.
D. Framing shall be spaced a maximum of 24” on centers.
E. All blocking, bracing and other framing components must be installed prior to the installation of ARMOROC PANEL™.
F. Framing must be of good quality, free of bows, twists or other malformations.


A. Deflection of panels shall be limited to L/240.
B. Provide a 1/8” vertical & horizontal joint between panels.
C. Install panels with long dimensions vertical. All panel joints must occur over a framing member. All panel edges are to be supported by a framing member.
D. Cut panel to length as needed to ensure butt ends are centered on the framing member.
E. Panels shall be cut to size with a circular saw equipped with cement cutting blade and a dry dust collection device or a water-dispensing device that limits the amount of airborne dust. Wear safety glasses and a NIOSH approved dust mask when cutting the panel. Collected dust shall be disposed in a safe manner and in compliance with local, state and federal ordinances.
F. A support framing member must always occur behind fastener location.
G. Fasten each panel to framing after it has been placed using the following fastening schedule:

1. Fastener placement shall be a maximum of 12” on center along all supports at panel joints, edges and in the field of the panel.
2. Fastener placement shall be a minimum ¾” from all panel edges.
3. Fastener placement shall be a minimum 2” from panel corners. Off-set fasteners to avoid 45 degree fastener placement at board corners (to prevent cracking). Best practice is 2” fastener corner distance up the first edge, and 4” fastener corner distance down the adjacent edge.
4. Begin fastening at one end and fan out across the panel. Do not fasten all the corners first.
5. Drive fasteners so the heads are flush with the surface of the board. Do not overdrive fasteners.

H. In exterior applications, control joints (where applicable and as designed by architect and/or engineer) shall be utilized to prevent transfer of any movement or stress to exterior finish systems. Through-wall control joints shall be designed to isolate a maximum of 250 sq. ft. of wall area. Provide separate framing member at each side of control joint. Install per manufacturer’s instructions.
I. Do not nail or screw any collateral building materials to panels without a secure backing surface behind the panel to receive the fastener.
J. Cutouts in the panels should be made before installing the panel whenever possible. If a cutout is required after the panel is installed, set the depth of the saw blade to ensure that the framing is not scored. Continuous structural perimeter support such as blocking, bracing and bridging is required at all cutouts and/or penetrations
larger than 4″in either direction.


A. Left over material shall be removed from the job site.
B. Remove foreign material from surface, including dust.


A. Avoid concentrated point loads on ARMOROC PANEL™ by referring to concentrated load tables and as determined by project architect & engineer.
B. Measures shall be taken to distribute concentrated and point loads on the system during construction such as the utilization of structural building panels such as plywood or OSB over multiple spans.
C. Workers must take extra care to avoid impacts that can cause deforming marks or even penetrations in the sheathing surface of these panels and will need repair.


A. Before the application of finish materials, ensure that all panels are properly installed with the fastener head driven flush or slightly below the surface of the panels. Fill all voids and depressions with compatible patching compounds.
B. Joints:

1. For exterior application use premixed elastomeric joint caulking or sealant as approved by the synthetic coatings manufacturer’s finish system. Use only fully elastomeric synthetic coatings.
2. For interior applications design for visible panel joints or use metal/plastic batten cover strips at panel joints.

C. Vapor barriers, membranes, sheathings, claddings, accessories, etc. may be secured to ARMOROC PANEL™ by following the installation instructions provided by each product’s respective manufacturer.
D. Surface Treatments: ARMOROC PANEL™ has a pH of 11-12 and therefore alkali-resistant coatings may be required. Use of an alkaline-resistant primer may be used prior to application of traditional coatings such as paints/stains. It is advisable to refer to the coating manufacturer in all instances. For surface treatments that are not vapor or moisture permeable, the reverse and all edges of the panel should also be treated in the same way to avoid the panel being unbalanced and exhibiting warping under extreme conditions of humidity variance.
E. Ceramic title should be installed over a crack isolation or cleavage membrane applied to ARMOROC PANEL™. Use latex modified thin set mortar that complies with ANSI Standards for application of the tile to the membrane unless
the tile or membrane manufacture directs the use of an alternate material that complies with ANSI Standards