Typical deflection limits referenced in code books are l 360 l 240 or l 180.
Ibc roof deflection limits.
Bedrooms and habitable attic floors l 360 30 psf.
For structural roofing and siding made of formed metal sheets the total load deflection shall not exceed l 60.
For continuous aluminum structural members supporting edge of glass the total.
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.
Both i codes just say floors 13 years ago.
Chapter 3 of the international residential code irc provides the maximum allowable deflection for a given structural member floor roof wall etc.
Examples of code prescribed deflection limits and live load values are.
The international codes i codes are the widely accepted comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe sustainable affordable and resilient structures.
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.
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.
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.
Living room floors l 360 40 psf.
For secondary roof structural members supporting formed metal roofing the live load deflection shall not exceed l 150.
I don t see any exception for decks or for floors which have different finishes on the underside.
For secondary roof structural members supporting formed metal roofing the live load deflection shall not exceed l 150.
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 secondary wall members supporting formed metal siding the design wind load deflection shall not exceed l 90.
For structural roofing and siding made of formed metal sheets the total load deflection shall not exceed l 60.
See the table below.
B for cantilever members l shall be taken as twice the length of the cantilever.
Note it gives the allowable deflection based on a fractional span quantity so a larger denominator will yield less deflection.
These limits are based on live loads and activities experienced in specific rooms of a house.
