Intertek Directory of Building Products

Comb. Deck (AC-32)
Slope: 2:12

1. Optional rosin paper.
2. Optional Insulation: Glass fiber, Wood fiber, Polyisocyanurate, Phenolic, Perlite, or any combination of these, or ½” Dens Deck, 1/2" pearlite or 1/2" wood fiberboard applied over EPS or EXPS insulation. Note:  When EPS or EXPS insulation is applied over a metal or combustible deck, a thermal barrier complying with section 2603.4.1.5 of the IBC is required.
3. Optional with Insulation: One Ply of ASTM D4601 Type II base sheet, HPR Tribase or HPR Tribase Plus mechanically fastened
4. Minimum of two plies of ASTM D4601 Type II base sheet, Tribase or TriBase Plus fully adhered in Weatherking Mastic or Weatherking Plus Mastic or Weatherking Plus WC 
5. Minimum of one ply of VersiPly 80, Stress-Ply, StressPly FR, StressPly Max, StressPly E, StressPly E FR, StressPly EUV, StressPly EUV FR, Stress-Ply Plus, StressPly Plus FR, OptiMax fully adhered in Weatherking Mastic or Weatherking Plus Mastic or Weatherking Plus WC Mastic at 1-1/2 to 3 gallons per roofing square per ply.
6. Coating with Grip Mastic or Weatherking FR Top Coat or WeatherScreen at a minimum rate of 3 gallons per roofing square.
7. Surface with roofing gravel at a minimum of 400 lbs. per roofing square.

Note: The component materials of each system must be applied in the order in which they are listed above.

Evaluated to the following:

The roof covering systems in this section have been evaluated for external fire resistance Classifications A, B, C as outlined by the following test methods:

• ASTM-E108 - American Society for Testing & Materials 'Standard Methods of Fire Test of Roof Covering'
• FM-4470, Section 5.1.A - Factory Mutual 'Standard Method of Test for Fire Resistance of Roof Covering Materials'
• NFPA-256 - National Fire Protection 'Standard Method of Fire Tests of Roof Covering'
• UBC-15-2-94 - Uniform Building Code 'Test Standard for Determining the Fire Retardancy of Roof Covering Materials'
• ULC-S107 - Underwriters' Laboratories of Canada 'Standard Method of Tests for Fire Resistance of Roof Covering Materials'
• UL-790 - Underwriters' Laboratories Inc. 'Tests for Fire Resistance of Roof Covering Materials'

Each system listing identifies the deck substrate as either non-combustible or combustible. Systems evaluated for combustible decks will provide the same ratings when applied over non-combustible decks. Unless otherwise noted in individual listings, combustible decks shall be sheathed with a minimum 15/32" veneer plywood or minimum 7/16" non-veneer APA rated sheathing panel (oriented strand board panels, structural particleboard panels, composite panels or wafer-board panels) or 3/4" thick solid wood sheathing boards. The component materials of each system must be applied in the order in which they are listed. All components of the system must be listed for external fire exposure by an agency acceptable to the AHJ.

Some Roof Covering Systems have been evaluated for other performance characteristics, in addition to external fire exposure. Where applicable, such additional performance characteristics are noted within the specific listing.

In all cases, manufacturer's instructions should be consulted for installation procedures and details not covered by these listings.

Listed Materials are identified by a label or marking bearing the wording, "Listed Roofing Component", a reference number or code and the WHI Certification Mark. 

Intertek Testing Services is a CAL FIRE Approved Testing Laboratory.