Chapter
Jun 21, 2023
Chapter 8
Roof Projections
Publication: Snow Loads: Guide to the Snow Load Provisions of ASCE 7-22
Abstract
Snow drifts frequently form at parapet walls and adjacent to rooftop units (RTUs). The drift on the upwind side of the RTU is a windward drift for the same reasons as for parapet walls. There are significant differences between leeward drifts at roof steps and windward drifts at a parapet wall, roof projection or roof step. Leeward drifts have a triangular shape, whereas windward drifts begin with a quadrilateral shape and given sufficient upwind snow source and wind, may morph into a triangular shape. A taller addition to an existing building is a common problem for structural engineers. The new roof geometry results in a roof step. One approach to minimize the leeward drift atop the existing roof is to construct a snow capture wall at the common column line.
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Information
Published In
Snow Loads: Guide to the Snow Load Provisions of ASCE 7-22
Pages: 93 - 102
Copyright
© 2023 American Society of Civil Engineers.
History
Published online: Jun 21, 2023
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ASCE Technical Topics:
- Buildings
- Climates
- Construction engineering
- Construction management
- Design (by type)
- Engineering fundamentals
- Environmental engineering
- Existing buildings
- Geometrics
- Highway and road design
- Meteorology
- Precipitation
- Project management
- Roofs
- Snow
- Structural engineering
- Structural members
- Structural systems
- Structures (by type)
- Walls
- Wind engineering
Authors
Affiliations
Michael O’Rourke, Ph.D.
P.E.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.