Structural Deflection Limits per International Building Code 2015 (IBC 2015), Table 1604.3

April 20, 2018 Abdul Siraj, P.E.

In this post, I will provide a brief overview of the structural deflection limits of structural elements based on loading conditions specified in the International Building Code 2015 (IBC 2015), Table 1604.3.

 

Roof Members Deflection Limits

Members supporting plaster or stucco ceiling (Live Load) = L/360

Members supporting plaster or stucco ceiling (Snow or Wind load) = L/360

Members supporting plaster or stucco ceiling (Dead + Live Load) = L/240

 

Members supporting nonplaster ceiling (Live Load) = L/240

Members supporting nonplaster ceiling (Snow or Wind load) = L/240

Members supporting nonplaster ceiling (Dead + Live Load) = L/180

 

Members not supporting ceiling (Live Load) = L/180

Members not supporting ceiling (Snow or Wind load) = L/180

Members not supporting ceiling (Dead + Live Load) = L/120

 

Floor Members Deflection Limits

Floor members  (Live Load) = L/360

Floor members (Snow or Wind load) = N/A

Floor members (Dead + Live Load) = L/240

 

Exterior Walls Deflection Limits

Walls with plaster or stucco finishes (Live Load) = N/A

Walls with plaster or stucco finishes (Snow or Wind load) = L/360

Walls with plaster or stucco finishes (Dead + Live Load) = N/A

 

Walls with other brittle finishes (Live Load) = N/A

Walls with other brittle finishes (Snow or Wind load) = L/240

Walls with other brittle finishes (Dead + Live Load) = N/A

 

Walls with flexible finishes (Live Load) = N/A

Walls with flexible finishes  (Snow or Wind load) = L/120

Walls with flexible finishes  (Dead + Live Load) = N/A

 

Interior Partitions Deflection Limits

Partitions with plaster or stucco finishes (Live Load) = L/360

Partitions with plaster or stucco finishes (Snow or Wind load) = N/A

Partitions with plaster or stucco finishes (Dead + Live Load) = N/A

 

Partitions with other brittle finishes (Live Load) = L/240

Partitions with other brittle finishes (Snow or Wind load) = N/A

Partitions with other brittle finishes (Dead + Live Load) = N/A

 

Partitions with flexible finishes (Live Load) = L/120

Partitions with flexible finishes  (Snow or Wind load) = N/A

Partitions with flexible finishes  (Dead + Live Load) = N/A

 

Farm Buildings Deflection Limits

Farm Buildings (Live Load) = N/A

Farm Buildings (Snow or Wind load) = N/A

Farm Buildings (Dead + Live Load) = L/180

 

Greenhouses

Greenhouses (Live Load) = N/A

Greenhouses (Snow or Wind load) = N/A

Greenhouses (Dead + Live Load) = L/120