How to Guide

Notes:
– For unbraced sections, allowable moment is based on 2007 AISI Specification Section C3.1.2 with weak axis and torsional unbraced length assumed to be the listed span
(completely unbraced). For mid-span braced sections, allowable moment based on 2007 AISI Specification Section C3.1.2 with weak axis and torsional unbraced length
assumed to be one-half of the listed span (bracing at mid-span).
– Web crippling calculation based on bearing length = 1 inch.
– Web crippling and shear capacity have not been reduced for punchouts. If web punchouts occur near support members must be checked for reduced shear and web
crippling in accordance with the 2007 AISI Specification.
– Values are for simple span conditions.
e Web stiffeners required at support.
The technical content of this literature is eective 4/9/15 and supersedes all previous information.Pub. No. CD-ProSTUD 4/15
clarkdietrich.com
Deflection Limit L/240
Deflection Limit L/360
ProSTUD
®
ALLOWABLE CEILING SPANS
ProSTUD ALLOWABLE CEILING SPANS
Section
Fy
(ksi)
4psf
Lateral Support of Compression Flange
6psf
Lateral Support of Compression Flange
Unsupported
joist spacing (in) o.c.
Mid-span
joist spacing (in) o.c.
Unsupported
joist spacing (in) o.c.
Mid-span
joist spacing (in) o.c.
12 16 24 12 16 24 12 16 24 12 16 24
162PDS125-15 50 7' 3" 6' 8" 5' 11" 7' 10" 7' 2" 6' 3" 6' 5" 5' 11" 5' 3" 6' 10" 6' 3" 5' 5"
250PDS125-15 50 8' 4" 7' 8" 6' 11" 10' 11" 9' 11" 8' 8" 7' 5" 6' 11" 6' 2" 9' 7" 8' 8" 7' 7"
350PDS125-15 50 9' 1" 8' 5" 7' 6" 12' 7" 11' 6" 10' 2" 8' 2" 7' 6" 6' 8" 11' 1" 10' 2" 8' 10" e
362PDS125-15 50 9' 2" 8' 6" 7' 7" 12' 9" 11' 8" 10' 3" 8' 3" 7' 7" 6' 9" 11' 3" 10' 3" 8' 11" e
400PDS125-15 50 9' 5" 8' 9" 7' 10" 13' 1" 12' 0" 10' 7" e 8' 6" 7' 10" 6' 11" e 11' 7" e 10' 7" e 9' 3" e
162PDS125-19 65 7' 11" 7' 4" 6' 6" 8' 5" 7' 8" 6' 9" 7' 2" 6' 6" 5' 9" 7' 5" 6' 9" 5' 11"
250PDS125-19 65 9' 1" 8' 5" 7' 7" 11' 11" 10' 10" 9' 6" 8' 2" 7' 7" 6' 10" 10' 5" 9' 6" 8' 3"
350PDS125-19 65 10' 0" 9' 4" 8' 4" 14' 4" 13' 2" 11' 9" 9' 0" 8' 4" 7' 6" 12' 9" 11' 9" 10' 5"
362PDS125-19 65 10' 2" 9' 5" 8' 5" 14' 6" 13' 4" 11' 10" 9' 1" 8' 5" 7' 7" 12' 11" 11' 10" 10' 6"
400PDS125-19 65 10' 5" 9' 8" 8' 8" 14' 11" 13' 9" 12' 3" 9' 5" 8' 8" 7' 10" 13' 4" 12' 3" 10' 11"
162PDS125-30 33 9' 4" 8' 7" 7' 8" 9' 10" 9' 0" 7' 10" 8' 3" 7' 8" 6' 10" 8' 7" 7' 10" 6' 10"
250PDS125-30 33 10' 4" 9' 7" 8' 6" 13' 8" 12' 5" 10' 10" 9' 3" 8' 6" 7' 8" 11' 11" 10' 10" 9' 6"
350PDS125-30 33 11' 2" 10' 4" 9' 3" 16' 0" 14' 10" 13' 4" 10' 0" 9' 3" 8' 4" 14' 5" 13' 4" 11' 11"
362PDS125-30 33 11' 3" 10' 5" 9' 4" 16' 2" 15' 0" 13' 6" 10' 1" 9' 4" 8' 5" 14' 7" 13' 6" 12' 0"
400PDS125-30 33 11' 7" 10' 9" 9' 8" 16' 8" 15' 6" 13' 11" 10' 5" 9' 8" 8' 8" 15' 0" 13' 11" 12' 5"
550PDS125-30 33 12' 10" 11' 10" 10' 8" 18' 5" 17' 1" 15' 4" 11' 6" 10' 8" 9' 7" 16' 7" 15' 4" 13' 9"
600PDS125-30 33 13' 1" 12' 2" 10' 11" 18' 11" 17' 6" 15' 8" 11' 9" 10' 11" 9' 10" 17' 0" 15' 8" 14' 1"
162PDS125-33 33 9' 9" 9' 0" 8' 0" 10' 4" 9' 4" 8' 2" 8' 8" 8' 0" 7' 1" 9' 0" 8' 2" 7' 2"
250PDS125-33 33 10' 9" 9' 11" 8' 10" 14' 3" 12' 11" 11' 3" 9' 7" 8' 10" 7' 11" 12' 5" 11' 3" 9' 10"
350PDS125-33 33 11' 7" 10' 8" 9' 7" 16' 6" 15' 3" 13' 9" 10' 4" 9' 7" 8' 7" 14' 10" 13' 9" 12' 4"
362PDS125-33 33 11' 8" 10' 9" 9' 8" 16' 8" 15' 5" 13' 11" 10' 5" 9' 8" 8' 8" 15' 0" 13' 11" 12' 6"
400PDS125-33 33 12' 0" 11' 1" 9' 11" 17' 2" 15' 11" 14' 4" 10' 9" 9' 11" 8' 11" 15' 5" 14' 4" 12' 10"
550PDS125-33 33 13' 3" 12' 3" 11' 0" 19' 0" 17' 7" 15' 10" 11' 10" 11' 0" 9' 10" 17' 1" 15' 10" 14' 3"
600PDS125-33 33 13' 6" 12' 6" 11' 3" 19' 6" 18' 1" 16' 3" 12' 2" 11' 3" 10' 1" 17' 6" 16' 3" 14' 7"
Section
Fy
(ksi)
4psf
Lateral Support of Compression Flange
6psf
Lateral Support of Compression Flange
Unsupported
joist spacing (in) o.c.
Mid-span
joist spacing (in) o.c.
Unsupported
joist spacing (in) o.c.
Mid-span
joist spacing (in) o.c.
12 16 24 12 16 24 12 16 24 12 16 24
162PDS125-15 50 6' 10" 6' 3" 5' 5" 6' 10" 6' 3" 5' 5" 6' 0" 5' 5" 4' 9" 6' 0" 5' 5" 4' 9"
250PDS125-15 50 8' 4" 7' 8" 6' 11" 9' 7" 8' 8" 7' 7" 7' 5" 6' 11" 6' 2" 8' 4" 7' 7" 6' 8"
350PDS125-15 50 9' 1" 8' 5" 7' 6" 12' 5" 11' 4" 9' 11" 8' 2" 7' 6" 6' 8" 10' 10" 9' 11" 8' 8" e
362PDS125-15 50 9' 2" 8' 6" 7' 7" 12' 9" 11' 7" 10' 1" 8' 3" 7' 7" 6' 9" 11' 2" 10' 1" 8' 10" e
400PDS125-15 50 9' 5" 8' 9" 7' 10" 13' 1" 12' 0" 10' 7" e 8' 6" 7' 10" 6' 11" e 11' 7" e 10' 7" e 9' 3" e
162PDS125-19 65 7' 5" 6' 9" 5' 11" 7' 5" 6' 9" 5' 11" 6' 5" 5' 11" 5' 2" 6' 6" 5' 11" 5' 2"
250PDS125-19 65 9' 1" 8' 5" 7' 7" 10' 5" 9' 6" 8' 3" 8' 2" 7' 7" 6' 10" 9' 1" 8' 3" 7' 3"
350PDS125-19 65 10' 0" 9' 4" 8' 4" 13' 8" 12' 5" 10' 10" 9' 0" 8' 4" 7' 6" 11' 11" 10' 10" 9' 6"
362PDS125-19 65 10' 2" 9' 5" 8' 5" 14' 1" 12' 9" 11' 2" 9' 1" 8' 5" 7' 7" 12' 3" 11' 2" 9' 9"
400PDS125-19 65 10' 5" 9' 8" 8' 8" 14' 11" 13' 9" 12' 0" 9' 5" 8' 8" 7' 10" 13' 2" 12' 0" 10' 6"
162PDS125-30 33 8' 7" 7' 10" 6' 10" 8' 7" 7' 10" 6' 10" 7' 6" 6' 10" 6' 0" 7' 6" 6' 10" 6' 0"
250PDS125-30 33 10' 4" 9' 7" 8' 6" 11' 11" 10' 10" 9' 6" 9' 3" 8' 6" 7' 8" 10' 5" 9' 6" 8' 3"
350PDS125-30 33 11' 2" 10' 4" 9' 3" 15' 6" 14' 1" 12' 4" 10' 0" 9' 3" 8' 4" 13' 6" 12' 4" 10' 9"
362PDS125-30 33 11' 3" 10' 5" 9' 4" 15' 11" 14' 6" 12' 8" 10' 1" 9' 4" 8' 5" 13' 11" 12' 8" 11' 1"
400PDS125-30 33 11' 7" 10' 9" 9' 8" 16' 8" 15' 6" 13' 9" 10' 5" 9' 8" 8' 8" 15' 0" 13' 9" 12' 0"
550PDS125-30 33 12' 10" 11' 10" 10' 8" 18' 5" 17' 1" 15' 4" 11' 6" 10' 8" 9' 7" 16' 7" 15' 4" 13' 9"
600PDS125-30 33 13' 1" 12' 2" 10' 11" 18' 11" 17' 6" 15' 8" 11' 9" 10' 11" 9' 10" 17' 0" 15' 8" 14' 1"
162PDS125-33 33 9' 0" 8' 2" 7' 2" 9' 0" 8' 2" 7' 2" 7' 10" 7' 2" 6' 3" 7' 10" 7' 2" 6' 3"
250PDS125-33 33 10' 9" 9' 11" 8' 10" 12' 5" 11' 3" 9' 10" 9' 7" 8' 10" 7' 11" 10' 10" 9' 10" 8' 7"
350PDS125-33 33 11' 7" 10' 8" 9' 7" 16' 1" 14' 7" 12' 9" 10' 4" 9' 7" 8' 7" 14' 1" 12' 9" 11' 2"
362PDS125-33 33 11' 8" 10' 9" 9' 8" 16' 6" 15' 0" 13' 2" 10' 5" 9' 8" 8' 8" 14' 5" 13' 2" 11' 6"
400PDS125-33 33 12' 0" 11' 1" 9' 11" 17' 2" 15' 11" 14' 3" 10' 9" 9' 11" 8' 11" 15' 5" 14' 3" 12' 5"
550PDS125-33 33 13' 3" 12' 3" 11' 0" 19' 0" 17' 7" 15' 10" 11' 10" 11' 0" 9' 10" 17' 1" 15' 10" 14' 3"
600PDS125-33 33 13' 6" 12' 6" 11' 3" 19' 6" 18' 1" 16' 3" 12' 2" 11' 3" 10' 1" 17' 6" 16' 3" 14' 7"
ALLOWABLE CEILING SPANS18