Prefabricated Curbs

Economical and Convenient Alternative to Site Built Curbs

VELUX Commercial’s prefabricated curbs are fully assembled to reduce installation time and cost, with no chance of missing parts and no field assembly. Available in insulated and non-insulated models as structural or non-structural. Choose steel (CCA6 or CCA3) or sheet aluminum (CCAW) construction.

Models CCA6 and CCA3 curbs come standard with an impact tested security screen that is fabricated in a 6″ x 6″ welded grid pattern using 3/16″ cold-rolled galvanized steel rod, with an optional 4″ x 4″ grid for California. The optional structural 14 gauge steel curb eliminates the need for costly structural reinforcement.

CCA3 curbs are constructed with fiberglass insulation (R-value >5). CCAW thermally enhanced curbs are constructed with 1-1/2″ rigid insulation (R-value 5.8).

Product Overview Download PDF

  • Thermally Enhanced Curb (CCAW)
  • Steel Curb, Insulated (CCA3)
  • Steel Curb, Non-Insulated (CCA6)
  • Installs above roof deck

  • Thermally broken sheet aluminum

  • Interior aluminum liners painted white, mill exterior

  • 1-1/2″ rigid insulation

  • Standard 9″, 12″ or 16″ curb height

  • HS adhesive clamping at corners

  • 2×2 wood nailer

  • R-value 5.8

  • Installs above roof deck
  • 14 gauge structural steel or 18 gauge non-structural
  • Optional 14 gauge spans between joists up to 6′ OC with no additional framing required
  • Interior steel liners painted white
  • 1-1/2″ thick 3lb. density fiberglass insulation
  • Curb heights of 9″, 12″, 16″, 18″ and 24″
  • Full height mitered and welded corners
  • Factory installed 3/16″ security grid at 6″ OC with optional:
    • No security screen
    • California grid – 3/16″ security grid at 4″ OC
    • Burglar bars – 8×8 grid, 1/2″ diameter steel
  • 2×2 wood nailer
  • R-value >5
  • Installs under roof deck

  • 14 gauge structural steel or 18 gauge non-structural

  • Optional 14 gauge spans between joists up to 6′ OC with no additional framing required

  • Interior steel liners painted white

  • Curb heights of 9″, 12″, 14″ and 16″

  • Full height mitered and welded corners

  • Factory installed 3/16″ security grid at 6″

  • OC with optional:

    • No security screen

    • California grid – 3/16″ security grid at 4″ OC

    • Burglar bars – 8×8 grid, 1/2″ diameter steel

  • 2×4 wood nailer

  • R-value >5