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Built-up Roofing Systems

Johns Manville Roofing

Four Ply Gravel Surfaced Fiber Glass Built-Up Roof for use over wood or other nailable decks on inclines of up to 3 in. per foot

ebuild Ref. No. 4GNG
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. 4GNG
Number of Plies 4
Application Method Asphalt-applied
Membrane Type Fiberglass
Required Substrate/Deck Type Nailable
Type of Intermediate Felts Fiber glass
Required Surfacing Gravel
Composition JM Base Sheet, 3 JM Ply Felts
Recommended Roof Slope per Foot 3 in.
Approximate Installed Weight per 100 sq ft
  • 452 lb
  • 658 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
  • Asphalt (Up to 1/2 in.): 69 lb (170°F, Type II, Flat) per 100 sq ft of roof area
  • Asphalt (1/2 in. to 3 in.): 69 lb (190°F, Type III, Steep) per 100 sq ft of roof area
  • Asphalt (0 to 3 in.): 69 lb (PermaMop) per 100 sq ft of roof area
  • Surfacing (Flood coat of asphalt): 60 lb per 100 sq ft of roof area
  • Surfacing (Gravel): 400 lb per 100 sq ft of roof area
  • Surfacing (Slag): 300 lb per 100 sq ft of roof area

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