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Built-up Roofing Systems

Johns Manville Roofing

Five Ply Mineral Surfaced Fiber Glass Built-Up Roof for use over wood or other nailable decks on inclines of 1/4 in. to 6 in. per foot (20.8 to 500 mm/m).

ebuild Ref. No. 5GNC
Retail Price Information
List Price Notice

Where prices are shown, they are based on the best information available to ebuild and generally refer to manufacturer's suggested retail prices. They should be used for reference only. In some instances, the list price refers to the lowest-cost version of an item that may be available in a variety of colors, finishes, sizes -- or upgraded features. Check with local distributors for actual prices.

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Product Specifications

Manufacturer Model No. 5GNC
Number of Plies 5
Application Method Asphalt-applied
Membrane Type Fiberglass
Required Substrate/Deck Type Nailable
Type of Intermediate Felts Fiber glass
Type of Cap Sheet Mineral surface cap sheet
Required Surfacing Granule surface cap sheets
Composition JM Base Sheet, 3 JM Ply Felts & GlasKap
Recommended Roof Slope per Foot
  • 1/4 in.
  • 6 in.
Approximate Installed Weight per 100 sq ft
  • 200 lb
  • 296 lb
Additional Parts Required/Recommended
  • Sheathing Paper: 1 layer (for wood board decks only per 100 sq ft of roof area
  • Felts (Base): 1 ply (GlasBase, GlasBase Plus, Permaply 28 or Ventsulation Felt) per 100 sq ft of roof area
  • Felts (Intermediate): 3 plies (GlasPly Premier or GlasPly IV) per 100 sq ft of roof area
  • Felts (Cap): 1 ply (GlasKap or GlasKap) per 100 sq ft of roof area
  • Asphalt (Up to 1 in.): 92 lb (170°F, Type II, Flat) per 100 sq ft of roof area
  • Asphalt (1 in. to 3 in.): 92 lb (190°F, Type III, Steep) per 100 sq ft of roof area
  • Asphalt (3 in. to 6 in.): 92 lb (220°F, Type IV, Special Steep) per 100 sq ft of roof area
  • Asphalt (0 to 6 in.): 92 lb (PermaMop) per 100 sq ft of roof area

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