Technical Content

Limiting Height / Span Tables

Interior Opening Framing

Allowable header spans for interior framing:

Allowable header spans for 5 psf

Allowable header spans for 10 psf

Allowable header spans for 15 psf

Allowable opening widths for interior jamb studs:

Allowable opening widths for interior jamb studs

Exterior Opening Framing

Note: Charts below are based on a Deflection Factor of 0.7
IBC 2000, 2003 & 2006 allows a load reduction of 0.7 times the component and cladding load when determining deflection limits per IBC Table 1604.3, note f.
Click here if you need tables based on a Deflection Factor of 1.0

Allowable header spans for exterior framing:

Allowable header spans for 20 psf (DF = 0.7)

Allowable header spans for 25 psf (DF = 0.7)

Allowable header spans for 30 psf (DF = 0.7)

Allowable opening widths for exterior jamb studs:

Allowable opening widths for exterior jamb studs (DF = 0.7)

• For opening conditions outside the profiles listed in the above tables, please submit a RedHeader RO Sizing Sheet to ClarkDietrich Technical Services.