commercial roof systems we shape our buildings; thereafter they shape us. -winston churchill
TRANSCRIPT
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Commercial Roof Systems
We shape our buildings; thereafter they shape us.
-Winston Churchill
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Commercial Roof Systems
• Commercial Roof Shapes • Pitched Roof Systems• Roofing Materials for Pitched Roofs• Low-Slope Roof Systems• Roofing Material for Low-Slope Roofs
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Commercial Roof Shapes
Shed Gable Hip Gable with Dormer
Low-slope Gable & Valley Hip & ValleyGambrel
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.
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Typical Pitched Roof
Roof Covering
Underlayment
Roof Deck
Roof Framing
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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
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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
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Low-Slope Roofs
• Sometimes incorrectly called “flat” roofs
• Provide small slope to provide roof drainage and to prevent ponding
©iStockphoto.com
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Typical Low-Slope Roof
Surfacing
Insulation
Roof Framing
Weatherproofing
Roof Decking
Reinforcing
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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)
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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
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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)
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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
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Commercial Roof Systems
• Commercial Roof Shapes • Pitched Roof Systems• Roofing Materials for Pitched Roofs• Low-Slope Roof Systems• Roofing Material for Low-Slope Roofs
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Image Resources
• National Roofing Contractors Association (NRCA) (www.nrca.net)
• www.constructionphotographs.com• www.wikimedia.com• U. S. Fish and Wildlife Service