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Wind Load Report

1. Site & Building Data

Roof Type: Gable  
Wind Speed (ult): 180 mph
Exposure Category: B  
Enclosure Class: Enclosed  
Building Width (W): 38 ft.
Building Length (L): 45 ft.
Eave Height (he): 17.5 ft.
Foundation Height (hf): 0 ft.
Roof Pitch: 2 /12
Eave Overhang (OHe): 1 ft.
Gable Overhang (OHg): 1 ft.

2. Parameters & Coefficients

Topographic Factor (Kzt): 1.0
Directionality Factor (Kd): .85
Roof Angle (θ): 9.46 deg.
Mean Roof Height (h): 19.08 ft.
Ridge Height (hr): 20.67 ft.
Pos. Internal Pressure (+GCpi): +0.18  
Neg. Internal Pressure (-GCpi): -0.18  
Velocity Pressure Exp. Coeff. (Kh): 0.70 @ z=h
Velocity Pressure (qh): 49.39 psf
End Zone Width (a): 3.00 ft.
Zone 2/2E Dist.: 19.00 ft.

3. Design Assumptions and Notes

Code Standard: ASCE 7-10
Geometry: Regular-Shaped Bldg.
Height Class: Low-Rise Building
Notes:

4. Design Loads

Top Chord Dead Load: 10 psf
Bottom Chord Dead Load: 10 psf
Truss/Rafter Spacing: 16 in. o/c

4. Design Wind Pressures: MWFRS Envelope Procedure


Load Case A: Transverse Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 0.44 12.78 30.56
2 -0.69 -42.97 -25.19
3 -0.40 -28.78 -11.00
4 -0.33 -25.27 -7.49
1E 0.67 24.03 41.81
2E -1.07 -61.74 -43.96
3E -0.58 -37.42 -19.64
4E -0.49 -33.22 -15.43
2OH -0.69 -34.08
2EOH -1.07 -52.85
3OH -0.40 -19.89
3EOH -0.58 -28.53
2OH+W -0.69/-0.7 -68.66
2EOH+W -1.07/-0.7 -87.43
a) (+) and (-) signs signify wind pressures acting toward & away from surfaces.
b) External Pressure Coefficients linearly interpolated from Fig. 28.4-1 ASCE 7-10.
c) Design building for all wind directions, 4 load patterns per load case.
d) Total horizontal shear shall not be less than that by neglecting roof wind forces.
e) Min. wind load for enclosed or partially enclosed bldg.: 16 psf wall, 8 psf roof.
f) Design pressures are for strength design, multiply by 0.6 for ASD.
Wind Loads 2025D17
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
1/14/2025 1
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Load Case B: Longitudinal Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 -0.45 -31.12 -13.34
2 -0.69 -42.97 -25.19
3 -0.37 -27.17 -9.38
4 -0.45 -31.12 -13.34
5 0.40 10.87 28.65
6 -0.29 -23.21 -5.43
1E -0.48 -32.60 -14.82
2E -1.07 -61.74 -43.96
3E -0.53 -35.07 -17.29
4E -0.48 -32.60 -14.82
5E 0.61 21.24 39.02
6E -0.43 -30.13 -12.35
2OH -0.69 -34.08
2EOH -1.07 -52.85
3OH -0.37 -18.28
3EOH -0.53 -26.18
2EOH+W -1.07/-0.7 -87.43
3EOH+W -0.53/-0.7 -60.75
a) (+) and (-) signs signify wind pressures acting toward & away from surfaces.
b) External Pressure Coefficients linearly interpolated from Fig. 28.4-1 ASCE 7-10.
c) Design building for all wind directions, 4 load patterns per load case.
d) Total horizontal shear shall not be less than that by neglecting roof wind forces.
e) Min. wind load for enclosed or partially enclosed bldg.: 16 psf wall, 8 psf roof.
f) Design pressures are for strength design, multiply by 0.6 for ASD.


Torsional Load Cases
Surface Load Case GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1T A - 3.19 7.64
2T A - -10.74 -6.30
3T A - -7.20 -2.75
4T A - -6.32 -1.87
5T B - 2.72 7.16
6T B - -5.80 -1.36
a) (+) and (-) signs signify wind pressures acting toward & away from surfaces.
b) Pressures designated with a "T" are 25% of full design wind pressures.
c) Torsional loading shall apply to all 8 load patterns using the figures shown.
d) Design pressures are for strength design, multiply by 0.6 for ASD.
e) Torsional Design Exceptions: One story bldg. with h ≤ 30 ft,
   Two stories or less framed with light frame construction,
   Two stories or less with flexible diaphragms.
Wind Loads 2025D17
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
1/14/2025 2
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5. Wind Load Calculations


1.) Lateral Loads - Transverse Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
45 ft.
6.00 ft.
39.00 ft.
174.4 plf
132.7 plf
126.2 plf
67.1 plf
4177 lbs
3779 lbs
71.1 plf
54.7 plf
117.3 plf
81.6 plf
100.4 plf
64.8 plf
8.7 plf
6.9 plf
54.2 plf
37.8 plf
2.9 plf
2.0 plf
1 ft.
1 ft.
a) (-) signs signify wind lateral forces acting opposite to the direction of the arrows shown.
b) Strength design values multiplied by 0.6 to obtain ASD values.



Wind Base Shear (ASD)
Load Case A: Transverse Direction
Load Case Walls (lbs) Roof (lbs) Roof Overhangs (lbs) Total Lateral Load (lbs) R1 (lbs) R2 (lbs)
Positive Internal Pressure 9594 -1329 -309 7956 4177 3779
Negative Internal Pressure 9594 -1329 -309 7956 4177 3779
Roof Pressure = 0 9594 0 0 9594 5059 4535
Min. Pressures (8 psf, 16 psf) 3780 684 68 4532 2266 2266
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 2025D17
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
1/14/2025 3
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2.) Lateral Loads - Longitudinal Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
38 ft.
3.00 ft.
35.00 ft.
158.2 plf
121.9 plf
111.5 plf
57.0 plf
23.1 lbs
163.6 lbs
436.2 lbs
615.2 lbs
4284 lbs
4026 lbs
a) (-) signs signify wind lateral forces acting opposite to the direction of the arrows shown.
b) Strength design values multiplied by 0.6 to obtain ASD values.
c) Where the length of building (L) exceeds 4X the mean roof height (h), wind drag forces should additionally be considered.



Wind Base Shear (ASD)
Load Case B: Longitudinal Direction
Load Case Walls (lbs) Gable Ends (lbs) Roof (lbs) Total Lateral Load (lbs) RA (lbs) RB (lbs)
Positive Internal Pressure 7072 1238 0 8310 4284 4026
Negative Internal Pressure 7072 1238 0 8310 4284 4026
Roof Pressure = 0 7072 1238 0 8310 4284 4026
Min. Pressures (8 psf, 16 psf) 3192 578 0 3770 1885 1885
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 2025D17
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
1/14/2025 4
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3.) Roof Truss Reactions:


Roof Truss/Rafter Reactions: Transverse End Zone
602 lbs
369 lbs
Max. Horz. ① = 71 lbs
Max. Uplift ① = 602 lbs
a) Strength design values multiplied by 0.6 to obtain ASD values.
b) Windward loads may be positive or negative depending on pitch of roof.



Roof Truss/Rafter Reactions (ASD)
w/ Positive Internal Pressure
Load Case Horizontal Load (lbs) Gross Uplift (lbs) Net Uplift (lbs) U1 (lbs) U2 (lbs)
Transverse Int. Zone 42 1162 533 340 193
Transverse End Zone 69 1600 972 602 369
Longitudinal Int. Zone 42 1108 480 306 173
Longitudinal End Zone 71 1535 906 565 341
a) Gross Uplift calculations do not include any counteracting roof dead loads.
b) Net Uplift calculations include counteracting roof dead loads multiplied by 0.6 per load case (7) ASCE 7-10.
c) Strength design values multiplied by 0.6 to obtain ASD values for wind loads.
d) Loads based on truss spacing calculated at 16" o/c.
e) Negative values for horizontal load indicate load acting in windward direction (tranverse load cases).
f) Negative values for uplift indicate net downward force (zero uplift).













*Disclaimer: The calculations produced herein are for initial design and estimating purposes only. The calculations and drawings presented do not constitute a fully engineered design. All of the potential load cases required to fully design an actual structure may not be provided by this calculator. For the design of an actual structure, a registered and licensed professional should be consulted as per IRC 2012 Sec. R802.10.2 and designed according to the minimum requirements of ASCE 7-10. The wind load calculations provided by this online tool are for educational and illustrative purposes only. Medeek Design assumes no liability or loss for any designs presented and does not guarantee fitness for use.
Wind Loads 2025D17
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
1/14/2025 5