Designing Floor Systems with Engineered Wood Joists - Ron Blank ...

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Building Code Requirements Safety Factor: Deflection Deflection is vertical movement of a floor system when subjected to loads. The Building Code specifies Deflection Limits for floor systems: L/360 Live Load Deflection and L/240 Total Load Deflection (“L” is joist length in inches) Example: Joist Length of 20’ (L= 240) 240 divided by 360 = .67 inches allowable deflection under full load condition Deflection limits are based on historical performance and are specified by the codes for user comfort and to prevent cracking of ceiling and flooring materials.
Building Code Requirements Safety Factor: Deflection Deflection performance of a floor system is determined by three factors: • Length of Joist Span • Loading Conditions • Stiffness of the Framing Member (joist) Of these three, Length of Joist Span has the greatest impact on deflection.
Page 1 and 2: © Ron Blank & Associates, Inc. 200
Page 3 and 4: An American Institute of Architects
Page 5 and 6: Course Objectives Upon completion o
Page 7 and 8: Impact of Engineered Wood on Floor
Page 9 and 10: Design Considerations: Building Cod
Page 11 and 12: Building Code Requirements Safety F
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Page 25 and 26: Building Code Requirements Because
Page 27 and 28: Design Considerations: Logistical F
Page 29 and 30: Design Considerations: Logistical F
Page 31 and 32: Design Considerations: Comfort and
Page 43 and 44: Design Strategies To determine the
Page 45 and 46: Design Strategies Client Satisfacti
Page 47 and 48: Engineered Wood Floor Framing Compo
Page 61 and 62: Design Assistance Manufacturer Lite
Page 63 and 64: Course Summary The design professio

Designing Floor Systems with Engineered Wood Joists - Ron Blank ...

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