CFR-42 ROOF SYSTEM ALLOWABLE UNIFORM LOAD CHART
CFR PANEL
THICKNESS		 DESIGN
CRITERIA		 ALLOWABLE LOAD (PSF)
PANEL SPAN (FT)
2.5 3.0 4.0 5.0 6.0 7.0
42" WIDE, 2" THICK
2 FASTENERS/CLIP		 BENDING & SHEAR 143.8 118.0 86.2 67.7 55.7 47.3
DEFLECTION (L/240) 120.3 98.3 70.6 53.8 42.4 34.3
CONNECTION 58.5 53.5 46.8 42.5 34.5 28.5
42" WIDE, 2.5" THICK
2 FASTENERS/CLIP		 BENDING & SHEAR 165.5 135.8 99.3 77.9 64.0 54.3
DEFLECTION (L/240) 147.5 121.0 87.6 67.4 53.7 43.9
CONNECTION 65.0 58.5 50.3 45.1 36.6 30.4
42" WIDE, 3" THICK
2 FASTENERS/CLIP		 BENDING & SHEAR 184.9 152.0 111.2 87.2 71.5 60.6
DEFLECTION (L/240) 171.5 141.1 102.8 79.6 63.9 52.7
CONNECTION 71.3 63.5 53.6 47.6 38.7 32.2
42" WIDE, 4" THICK
2 FASTENERS/CLIP		 BENDING & SHEAR 196.2 161.6 118.6 93.0 76.2 64.5
DEFLECTION (L/240) 210.0 173.4 127.3 99.4 80.6 67.2
CONNECTION 84.0 73.4 59.9 51.8 42.4 35.7
42" WIDE, 5" THICK
3 FASTENERS/CLIP		 BENDING & SHEAR 223.1 184.2 135.6 106.5 87.3 73.8
DEFLECTION (L/240) 235.4 194.9 143.8 112.9 92.2 77.3
CONNECTION 86.5 75.5 61.8 53.4 44.4 37.9
42" WIDE, 6" THICK
3 FASTENERS/CLIP		 BENDING & SHEAR 247.2 204.5 151.0 118.9 97.6 82.5
DEFLECTION (L/240) 247.8 205.4 152.2 120.1 98.5 82.9
CONNECTION 88.8 77.6 63.5 55.0 46.3 40.0

  • Based on CFR-42 panel with 24 ga. exterior face (min Fy = 50 ksi) and 26 ga. interior face (min Fy = 33 ksi).
  • Based on attachment at interior supports with CFR panel clip and (2 or 3 as shown above) 1/4"-14 Self-Drilling Tek 3 screws in min. 14 gage steel or (2) 1/4"-14 Self-Drilling Tek 3 screws in min. 12 gage steel. Two fasteners per clip are required at end supports.  In lieu of self-drilling screws, self-tapping screws may be used.
  • Allowable positive load is the lowest value of panel bending strength, shear strength & deflection limit.
  • Allowable suction load is the lowest value of panel bending strength, shear strength, deflection limit and connection strength for each fastener pattern.
  • Connection loads may be increased with Fablok.  Consult Metl-Span for additional loads.
  • The loads based on panel stress and deflection design criteria are derived from ASTM E-72 structural testing. The allowable loads are calculated with a factor of safety of 2.5 and 3.0 for bending and shear stresses, respectively, and deflection limitation of L/240 and with a factor of safety of 2.0 for connection strength.
  • The clip fastener capacity was determined from manufacturer fastener pullout data and the allowable loads are calculated with a factor of safety of 3.0.
  • The structural capacity of the purlins are not considered and must be examined independently.
  • Multiple spans are based on 3 or more spans conditions.
  • For allowable snow loads please consult factory.