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2018 IRC Table R802.11 Revised to Accommodate Rafters
with Longer Cantilevers
The following three tables on the following page have been generated to address the need for rafter-to-top plate connection uplift values for rafters that have a roof overhang greater
than 2 feet but not exceeding 4 feet. Table R802.11 only provides information for rafters having a maximum overhang of 2 feet. Be aware that these tables are based upon the following
assumptions:
Roof pitch < 5:12. Where the roof pitch >/= to 5:12, the tabulated uplift values will be conservative.
Exposure C (or B) and a maximum 33-foot mean roof height are assumed.
Rafter spacing of 24”. For rafter spacing of 48”, double the tabulated uplift values.
This memo is not intended to address roof trusses.
The tabulated uplift values include an allowance for roof and ceiling assembly dead load of 15 psf.
Linear interpolation between tabulated roof spans and wind speeds shall be permitted.
The intent of this memo is to provide a prescriptive solution for 2018 IRC Section R802.11.1.2 and thus these tables may be utilized for selecting the appropriate uplift connector without
the need for engineering calculations.
V ult=120 mph Exposure C Roof pitch < 5:12
Rafter Spacing = 24”
Uplift <lbs.>
Overhang <ft.>
Roof Span <ft.>
2
3
4
24
400
465
529
28
450
512
573
32
498
559
620
36
548
607
666
42
624
680
738
48
698
753
810
V ult=130 mph Exposure C Roof pitch < 5:12
Rafter Spacing = 24”
Uplift <lbs.>
Overhang <ft.>
Roof Span <ft.>
2
3
4
24
512
600
682
28
578
660
739
32
642
721
800
36
706
783
859
42
804
876
951
48
900
971
1044
V ult=140 mph Exposure C Roof pitch < 5:12
Rafter Spacing = 24”
Uplift <lbs.>
Overhang <ft.>
Roof Span <ft.>
2
3
4
24
634
746
848
28
716
821
920
32
796
897
994
36
876
974
1069
42
998
1091
1183
48
1120
1208
1300