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ANSI/TPI Allowable Loads

ANSI/TPI 1-2014 is the National Design Standard for Metal Plate Connected Wood Truss Construction. It is referenced in the 2009 IBC, 2012 IBC, and 2015 IBC.

This standard states that all connections which induce a tension perpendicular to grain stress shall be designed to resist cross grain tension forces. Although the ANSI/TPI 1-2014 standard does not affect the carrying capacity of hangers, the cross grain tension of the lumber may be limiting. The controlling factors that affect the calculated capacity of the hanger is the distance from the end of the supporting member, wood species, effective cross-sectional area of the wood and the location of the upper most fastener in the hanger (HE). Face Mount Hanger capacities may be affected by these standards. ANSI/TPI 1-2014 contains plating methods for satisfying this requirement. To avoid reduction of capacity, please consult with truss fabricator or contact MiTek USA.

USP Structural Connectors developed spreadsheets listing allowable loads for face mount hangers attached to one and two ply girder trusses with bottom chords of Douglas-Fir Larch, Southern Pine, Spruce-Pine-Fir, and Hem Fir wood. Each table is sorted by supported member size and various specialty hangers like hip/jack and 45° skewed hangers.

ANSI/TPI 1-2014 Allowable Loads for:

Hanger located greater than 5d from member end (d = bottom chord depth)
Douglas Fir-Larch
Southern Pine
Spruce-Pine-Fir
Hem Fir

Hanger located less than 5d from member end
Douglas Fir-Larch
Southern Pine
Spruce-Pine-Fir
Hem Fir

Hangers unaffected by ANSI/TPI 1-2014:
ANSI/TPI