Ibc Roof Deflection Limits

For secondary roof structural members supporting formed metal roofing the live load deflection shall not exceed l 150.

Ibc roof deflection limits.

For continuous aluminum structural members supporting edge of glass the total. These limits are based on live loads and activities experienced in specific rooms of a house. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. This section deals specifically with the required live loading for aluminum canopies.

In the 2015 ibc the body of table 1604 3 limits the deflection of exterior walls supporting plaster or stucco to l 360 with l being the span of the wall. For the purpose of the determining deflection limits herein. See the table below. Both i codes just say floors 13 years ago.

For aluminum structural members or panels used in roofs or walls of sunroom additions or patio covers not supporting edge of glass or sandwich panels the total load deflection shall not exceed l 60. Although it does not specifically name glazed components or assemblies or framing supporting glazing it does establish a deflection limit of l 240 for exterior walls supporting brittle finishes other than plaster or stucco. For structural roofing and siding made of formed metal sheets the total load deflection shall not exceed l 60. For structural roofing and siding made of formed metal sheets the total load deflection shall not exceed l 60.

Examples of code prescribed deflection limits and live load values are. The ibc which wouldn t apply to a sfr allows the greater deflection for roofs supporting non plaster finishes but like the irc it gives one deflection limit for floors period. Note it gives the allowable deflection based on a fractional span quantity so a larger denominator will yield less deflection. Chapter 3 of the international residential code irc provides the maximum allowable deflection for a given structural member floor roof wall etc.

For structural roofing and siding made of formed metal sheets the total load deflection shall not exceed l 60 for secondary roof structural members supporting formed metal roofing the live load deflection shall not exceed l 150 for secondary wall members supporting formed metal siding the design wind load deflection shall not exceed l 90 for roofs this exception only applies when the. Living room floors l 360 40 psf. I don t see any exception for decks or for floors which have different finishes on the underside. For secondary wall members supporting formed metal siding the design wind load deflection shall not exceed l 90.

Bedrooms and habitable attic floors l 360 30 psf. Typical deflection limits referenced in code books are l 360 l 240 or l 180.