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Commercial roof systems

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  • Commercial Roof Systems Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Roof covering – The outside layer; sheds water Underlayment – Sometimes called “felt” or “paper” and provides temporary protection during construction and a secondary weatherproofing layer during the life of the structure Roof Deck – The structural substrate that carries the roof loads to the roof framing, typically plywood or OSB (oriented strand board) Roof Framing – The structural support for the roof Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • This photograph shows a commercial facility with light-gauge steel trusses on CMU load bearing walls. Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Low-slope roofs are not flat. They are slightly sloped to roof drains so that water will not stand or “pond” on the roof. Because water moves more slowly on low-slope roofs, the roofing material must be highly resistant to infiltration. Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Surfacing – Protects the weatherproofing and reinforcement Reinforcement – Adds strength, puncture resistance, and dimensional stability to the roofing, and is often combined with another layer Weatherproofing – One or more layers that keep the water from entering the building Roof decking – A material used to span across beams or joists to create the roof surface. The decking for low-slope roofs is often ribbed metal sheets but can be other material such as plywood. Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Single ply membranes include a single layer of roofing material. Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • The protective coating provides weatherproofing as well as protection from UV exposure and mechanical damage. Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems
  • Civil Engineering and Architecture Unit 3 – Lesson 3.1 –Commercial Building Systems Project Lead The Way, Inc. Copyright 2010 Commercial Roof Systems

Commercial roof systems Commercial roof systems Presentation Transcript

  • Commercial Roof Systems We shape our buildings; thereafter they shape us. - Winston Churchill
  • Commercial Roof Systems
    • Commercial Roof Shapes
    • Pitched Roof Systems
    • Roofing Materials for Pitched Roofs
    • Low-Slope Roof Systems
    • Roofing Material for Low-Slope Roofs
  • Commercial Roof Shapes Shed Gable Hip Gable with Dormer Low-slope Gable & Valley Hip & Valley Gambrel Roofs for small commercial buildings can be similar to residential pitched roof shapes. Low-slope roofs (not completely flat) are common in large commercial construction.
  • Typical Pitched Roof
    • Roof Covering
    Underlayment Roof Deck Roof Framing
  • Roof Coverings for Pitched Roofs Standing Metal Seam Clay/Cement Tiles Asphalt Shingles Wood/Cedar Slate Can be similar to residential construction Courtesy US Fish & Wildlife
  • Pitched Roof Framing (Low Rise Buildings)
      • Wood trusses or rafters
      • Light gauge steel trusses
      • Structural steel trusses
      • Open web steel joists (lower slopes)
    Courtesy Isle of Palms Rec Dept. Light gauge steel trusses on CMU load bearing wall Open web steel joists on tilt-up concrete walls Courtesy Greg Thiel
  • Low-Slope Roofs
    • Sometimes incorrectly called “flat” roofs
    • Provide small slope to provide roof drainage and to prevent ponding
    ©iStockphoto.com
  • Typical Low-Slope Roof
    • Surfacing
    Insulation Roof Framing Weatherproofing Roof Decking Reinforcing
  • Low-Slope Roof Materials
    • Built-up Roof (BUR) membranes
      • “ Tar and Gravel”
      • Alternating layers of asphalt and reinforcing fabric
      • Aggregate surfacing
    Photograph provided with permission from the National Roofing Contractors Association (NRCA)
  • Low-Slope Roof Materials
    • Single Ply membranes
      • Often referred to by chemical acronyms
        • EPDM = ethylene propylene diene monomer
      • Fully adhered (glued), mechanically attached (screwed), or held down by ballast (e.g., gravel)
    Fully adhered EPDM roof system Ballasted EPDM roof system Photograph provided with permission from the National Roofing Contractors Association (NRCA) EPDM Photograph provided with permission from the National Roofing Contractors Association (NRCA) wikimedia
  • Low-Slope Roof Materials
    • Spray Polyurethane Foam (SPF) system
    • Two component system
      • Rigid closed cell spray foam insulation
      • Protective coating
    Photograph provided with permission from the National Roofing Contractors Association (NRCA)
  • Low-Slope Roof Framing
      • Wood Joists
      • Light Gauge Steel Joists
      • Open Web Steel Joists
      • Structural Steel
      • Structural Concrete Slab
    Open web steel joist roof framing with metal decking Couresty constructionphotographs.com
  • Commercial Roof Systems
    • Commercial Roof Shapes
    • Pitched Roof Systems
    • Roofing Materials for Pitched Roofs
    • Low-Slope Roof Systems
    • Roofing Material for Low-Slope Roofs
  • Image Resources
    • National Roofing Contractors Association (NRCA) ( www.nrca.net )
    • www.constructionphotographs.com
    • www.wikimedia.com
    • U. S. Fish and Wildlife Service