Formacore Curtain Wall Framework Specifications

The following information provides specifications for the framework to be used in curtain wall construction.


  • Curtain Wall Framing System:
    • Description: Framing shall be thermally broken. Horizontal and vertical members shall have a nominal face dimension of 2-1/4 inches and depth as indicated on shop drawings. Framing system shall provide a flush glazed appearance on all sides with no protruding glass stops.
    • Components: Manufacturer’s standard extruded aluminum mullions, entrance door framing, and indicated shapes.
    • Thermal Barrier: The thermal barrier shall consist of dual durometer Santoprene glazing gaskets and isolator/glazing clips that minimize all metal to metal contact between the exterior and interior. Systems employing non structural type thermal barriers are not acceptable.


  • Extrusions: ASTM B 221 (ASTM B 221M), 6063-T5 Aluminum Alloy.
  • Aluminum Sheet:
    • Anodized Finish: ASTM B 209 (ASTM B 209M), 5005-H14 Aluminum Alloy, 0.050” (1.27 mm) minimum thickness.
    • Painted Finish: ASTM B 209 (ASTM B 209M), 3003-H14 Aluminum Alloy, 0.080” (1.95 mm) minimum thickness.


  • Manufacturer's Standard Accessories:
    • Fasteners: Zinc plated steel concealed fasteners; Hardened aluminum alloys or AISI 300 series stainless steel exposed fasteners, countersunk, finish to match aluminum color.
    • Sealant: Non-skinning type, AAMA 803.3
    • Glazing: Setting blocks, edge blocks, and spacers in accordance with ASTM C 864, shore durometer hardness as recommended by manufacturer; Glazing gaskets in accordance with ASTM C 864.

RELATED MATERIALS (Specified In Other Sections)

  • Glass: Refer to Division 8 Glass and Glazing Section for glass materials.


  • Shop Assembly: Fabricate and assemble units with joints only at intersection of aluminum members with uniform hairline joints; rigidly secure, and sealed in accordance with manufacturer's recommendations.
    • Hardware: Drill and cut to template for hardware. Reinforce frames and door stiles to receive hardware in accordance with manufacturer's recommendations.
    • Welding: Conceal welds on aluminum members in accordance with AWS recommendations or methods recommended by manufacturer. Members showing welding bloom or discoloration on finish or material distortion will be rejected.
  • Fabrication Tolerances:
    • Material Cuts: Square to 1/32 inch (0.8 mm) off square, maximum, over largest dimension; proportionate amount of 1/32 inch (0.8 mm) on other two dimensions.
    • Maximum Offset: 1/64 inch (0.4 mm) in alignment between two consecutive members in line, end to end.
    • Maximum Offset: 1/64 inch (0.4 mm) between framing members at glazing pocket corners.
    • Joints (Between adjacent members in same assembly): Hairline and square to adjacent member.
    • Variation (In squaring diagonals for doors and fabricated assemblies): 1/16 inch (1.6 mm).
    • Flatness (For doors and fabricated assemblies): +/- 1/16 inch (1.6 mm) off neutral plane.


  • Anodized Finish: Anodized Finish:
    • Anodized finishes available in: Clear, Medium Bronze, Dark Bronze, Black, Champagne or White.
    • All finishes have a protective composite coating.
  • Anodized Finishing: Prepare aluminum surfaces for specified finish; apply shop finish in accordance with the following:
    • Anodic Coating: Electrolytic color coating followed by an organic seal applied in accordance with the requirements of AAMA 612-02. Aluminum extrusions shall be produced from quality controlled billets meeting AA-6063-T5.
      • Exposed Surfaces shall be free of scratches and other serious blemishes.
      • Extrusions shall be given a caustic etch followed by an anodic oxide treatment and then sealed with an organic coating applied with an electrodeposition process.
      • The anodized coating shall comply with all of the requirements of AAMA 612-02: Voluntary Specifications, Performance Requirements and Test Procedures for Combined Coatings of Anodic Oxide and Transparent Organic Coatings on Architectural Aluminum. Testing shall demonstrate the ability of the finish to resist damage from mortar, salt spray, and chemicals commonly found on construction sites, and to resist the loss of color and gloss.
      • Overall coating thickness for finishes shall be a minimum of 0.7 mils.
  • High Performance Organic Coating Finish:
    • Type Factory applied two-coat 70% Kynar resin or 70% Hylar resin, fluoropolymer based coating system, Polyvinylidene Fluoride (PVF-2), applied meeting AAMA 2605 specifications.
    • Colors: Selected by Architect from the following:
      • Standard coating color charts.
      • Custom coating color charts.
      • Color Name and Number:
  • Finishes Testing:
    • Apply 0.5% solution NaOh, sodium hydroxide, to small area of finished sample area; leave in place for sixty minutes; lightly wipe off NaOh; Do not clean area further.
    • Submit samples with test area noted on each sample.

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