Sign (C-45) · Lesson 7 of 7

Plastic Sign Faces and Mall Storefront Signs (CBC 402.6.4, 2606, 2611)

"Plastic Sign Faces and Mall Storefront Signs (CBC 402.6.4, 2606, 2611)" is lesson 7 of 7 in the Sign (C-45) Learning Hub. It opens with "Why the CBC Regulates Sign Plastics" and works through 5 short steps, then a worked example you can check yourself against.

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Steps in this lesson

  1. Why the CBC Regulates Sign Plastics
  2. Light-Transmitting Plastic: CC1 and CC2 (Section 2606.4)
  3. Plastic Signs on a Mall Storefront (Section 402.6.4)
  4. Foam Plastic Signs (Section 402.6.4.5)
  5. Interior Light-Transmitting Plastic Signs (Section 2611)

The worked example in the course applies this lesson to a realistic job in 6 steps, from "Wall area facing the mall" through "Material and encasement".

What you'll be able to do

  • Explain the main idea of "Plastic Sign Faces and Mall Storefront Signs (CBC 402.6.4, 2606, 2611)" in plain language you can use on the exam.
  • Apply this step with confidence: "Plastic Signs on a Mall Storefront (Section 402.6.4)".
  • Apply this step with confidence: "Foam Plastic Signs (Section 402.6.4.5)".
  • Apply this step with confidence: "Interior Light-Transmitting Plastic Signs (Section 2611)".
  • Test yourself on the worked example and the quick-check quiz inside the classroom.
Plastic Sign on a Mall StorefrontTenant storefront facing the mallSTORE NAME5 ft5 ftWall facing mall: 30 ft x 12 ft = 360 sq ftSign: 20 ft x 30 in tall = 50 sq ftGold edge = metal-encased edges and backNext tenants on both sides (grey)CBC Sec. 402.6.4 (mall signs)Area: not over 20% of wall facing mall0.20 x 360 = 72 sq ft allowedSign is 50 sq ft: passesHeight: 36 in max (vertical: 96 x 36 in)Sign is 30 in tall: passesLocation: 18 in min from adjacent tenantsSign is 5 ft from each: passesInterior plastic signs (Sec. 2611.2)Aggregate 24 sq ft max; 100 sq ft if sprinkleredand all of the plastics are Class CC1Mall sign: 50 sq ft of 72 allowed, 30 in tall, 5 ft from neighborsFace plastic must meet Sec. 2606.4 (CC1 or CC2) and the edges and back must be encased in metalCC1: burns 1 in or less; CC2: burns 2 1/2 in per minute or less (ASTM D635, 0.060 in thick)2025 CBC Sec. 402.6.4, 2606.3, 2606.4, 2611.2 to 2611.4 - plastic storefront sign in a covered mallCC
The diagram for this lesson, exactly as it appears in the Learning Hub.

The first steps of this lesson

Step 1: Why the CBC Regulates Sign Plastics

Sign faces, channel-letter faces and routed panels are plastic, and Chapter 26 treats them as light-transmitting plastics (Section 2606.1) or foam plastics (Section 2603). Section 2606.2 requires enough technical data to substantiate the use of a light-transmitting material, and Section 2606.3 requires each unit or package to be identified with a mark or decal showing the material classification. Keep the label with the job file: the building official may ask for it.

Step 2: Light-Transmitting Plastic: CC1 and CC2 (Section 2606.4)

Light-transmitting plastics must have a self-ignition temperature of 650 degrees F or greater (ASTM D1929) and a smoke-developed index not greater than 450 (ASTM E84 or UL 723), or a maximum average smoke density rating not greater than 75 (ASTM D2843), and be one of two combustibility classes. Class CC1 has a burning extent of 1 inch or less at a nominal thickness of 0.060 inch or the thickness intended for use (ASTM D635). Class CC2 has a burning rate of 2 1/2 inches per minute (1.06 mm/s) or less under the same conditions. Section 2606.5 and 2606.6 require the assembly and fastening to withstand the Chapter 16 loads, with allowance for expansion and contraction.

The remaining 3 steps, the worked example and the quiz are in the course. This is a preview. The full lesson, with the step-by-step explanations, a worked example and a quick-check quiz, is inside the classroom.

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