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// CODE SNIPPET

R802.11 Roof Tie-Down

Residential Code 2018 of Kansas > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.11 Roof Tie-Down
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TABLE R802.11

RAFTER OR TRUSS UPLIFT CONNECTION FORCES FROM WIND (ASD) (POUNDS PER CONNECTION)a, b, c, d, e, f, g, h

RAFTER
OR TRUSS
SPACING
ROOF
SPAN
(feet)
EXPOSURE B
Ultimate Design Wind Speed VULT (mph)
110115120130140
Roof PitchRoof PitchRoof PitchRoof PitchRoof Pitch
< 5:12≥ 5:12< 5:12≥ 5:12< 5:12≥ 5:12< 5:12≥ 5:12< 5:12≥ 5:12
12" o.c.124843595370649588122113
18595274668981122112157146
247162897910898149137192178
2879699988121109167153216200
32867510997134120185170240222
369482120106146132203186264244
4210692135120166149230211300278
48118102151134185166258236336311
16" o.c.12645778709385126117162150
1878699888118108162149209194
249482118105144130198182255237
2810592132117161145222203287266
32114100145129178160246226319295
36125109160141194176270247351325
42141122180160221198306281399370
48157136201178246221343314447414
24" o.c.129686118106140128190176244226
18118104148132178162244224314292
24142124178158216196298274384356
28158138198176242218334306432400
32172150218194268240370340480444
36188164240212292264406372528488
42212184270240332298460422600556
48236204302268370332516472672622
RAFTER
OR TRUSS
SPACING
ROOF
SPAN
(feet)
EXPOSURE C
Ultimate Design Wind Speed VULT (mph)
110115120130140
Roof PitchRoof PitchRoof PitchRoof PitchRoof Pitch
< 5:12≥ 5:12< 5:12≥ 5:12< 5:12≥ 5:12< 5:12≥ 5:12< 5:12≥ 5:12
12" o.c.129588110102126118161151198186
18121111141131163151208195257242
24148136173160200185256239317298
28166152195179225208289269358335
32184168216199249231321299398373
36202185237219274254353329438411
42229210269248312289402375499468
48256234302278349323450420560524
16" o.c.12126117146136168157214201263247
18161148188174217201277259342322
24197181230213266246340318422396
28221202259238299277384358476446
32245223287265331307427398529496
36269246315291364338469438583547
42305279358330415384535499664622
48340311402370464430599559745697
24" o.c.12190176220204252236322302396372
18242222282262326302416390514484
24296272346320400370512478634596
28332304390358450416578538716670
32368336432398498462642598796746
36404370474438548508706658876822
42458420538496624578804750998936
4851246860455669864690084011201048

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mile per hour = 0.447 m/s, 1 pound = 0.454 kg, 1 pound per square foot = 47.9 N/m2, 1 pound per linear foot = 14.6 N/m.

  1. The uplift connection forces are based on a maximum 33-foot mean roof height and Wind Exposure Category B or C. For Exposure D, the uplift connection force shall be selected from the Exposure C portion of the table using the next highest tabulated ultimate design wind speed. The adjustment coefficients in Table R301.2(3) shall not be used to multiply the tabulated forces for Exposures C and D or for other mean roof heights.
  2. The uplift connection forces include an allowance for roof and ceiling assembly dead load of 15 psf.
  3. The tabulated uplift connection forces are limited to a maximum roof overhang of 24 inches.
  4. The tabulated uplift connection forces shall be permitted to be multiplied by 0.75 for connections not located within 8 feet of building corners.
  5. For buildings with hip roofs with 5:12 and greater pitch, the tabulated uplift connection forces shall be permitted to be multiplied by 0.70. This reduction shall not be combined with any other reduction in tabulated forces.
  6. For wall-to-wall and wall-to-foundation connections, the uplift connection force shall be permitted to be reduced by 60 plf for each full wall above.
  7. Linear interpolation between tabulated roof spans and wind speeds shall be permitted.
  8. The tabulated forces for a 12-inch on-center spacing shall be permitted to be used to determine the uplift load in pounds per linear foot.

R802.11.1 Uplift Resistance

Roof assemblies shall have uplift resistance in accordance with Sections R802.11.1.1 and R802.11.1.2.

Where the uplift force does not exceed 200 pounds (90.8 kg), rafters and trusses spaced not more than 24 inches (610 mm) on center shall be permitted to be attached to their supporting wall assemblies in accordance with Table R602.3(1).

Where the basic wind speed does not exceed 115 mph, the wind exposure category is B, the roof pitch is 5:12 (42-percent slope) or greater, and the roof span is 32 feet (9754 mm) or less, rafters and trusses spaced not more than 24 inches (610 mm) on center shall be permitted to be attached to their supporting wall assemblies in accordance with Table R602.3(1).

R802.11.1.1 Truss Uplift Resistance

Trusses shall be attached to supporting wall assemblies by connections capable of resisting uplift forces as specified on the truss design drawings for the ultimate design wind speed as determined by Figure R301.2(5)A and listed in Table R301.2(1) or as shown on the construction documents. Uplift forces shall be permitted to be determined as specified by Table R802.11, if applicable, or as determined by accepted engineering practice.

R802.11.1.2 Rafter Uplift Resistance

Individual rafters shall be attached to supporting wall assemblies by connections capable of resisting uplift forces as determined by Table R802.11 or as determined by accepted engineering practice. Connections for beams used in a roof system shall be designed in accordance with accepted engineering practice.

Related Code Sections


R802.11 Roof-Ceiling Construction, Roof Tie-Down
SPACING ROOF SPAN (feet) EXPOSURE B Ultimate Design Wind Speed V ULT (mph) 110 115 120 130 140 Roof Pitch Roof ...
Residential Code 2018 of Kansas > 8 Roof-Ceiling Construction > R802 Wood Roof Framing > R802.11 Roof Tie-Down
R804.3.8 Roof-Ceiling Construction, Roof Tie-Down
Roof assemblies shall be connected to walls below in accordance with Table R804.3. A continuous load path shall be provided to transfer uplift loads ...
Residential Code 2018 of Kansas > 8 Roof-Ceiling Construction > R804 Cold-Formed Steel Roof Framing > R804.3 Roof Construction > R804.3.8 Roof Tie-Down
2308.7.5 Wood, Wind Uplift
floor level down). Interpolation is permitted for intermediate values of V asd and roof spans. The rated capacity of approved tie-down devices ...
Building Code 2018 of Kansas > 23 Wood > 2308 Conventional Light-Frame Construction > 2308.7 Roof and Ceiling Framing > 2308.7.5 Wind Uplift
2109.2.4.7 Masonry, Tie Beams
Exterior walls and interior load-bearing walls constructed of adobe units shall have a continuous tie beam at the level of the floor or roof ...
Building Code 2018 of Kansas > 21 Masonry > 2109 Empirical Design of Adobe Masonry > 2109.2 Adobe Construction > 2109.2.4 Detailed Requirements > 2109.2.4.7 Tie Beams
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