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Wind Load Report - New Garage House Expansion

1. Site & Building Data

Roof Type: Gable  
Wind Speed (ult): 110 mph
Exposure Category: C  
Enclosure Class: Enclosed  
Building Width (W): 24 ft.
Building Length (L): 57 ft.
Eave Height (he): 22 ft.
Foundation Height (hf): 0 ft.
Roof Pitch: 4 /12
Eave Overhang (OHe): 1.5 ft.
Gable Overhang (OHg): 1.5 ft.

2. Parameters & Coefficients

Topographic Factor (Kzt): 1.0
Directionality Factor (Kd): .85
Roof Angle (θ): 18.43 deg.
Mean Roof Height (h): 24.00 ft.
Ridge Height (hr): 26.00 ft.
Pos. Internal Pressure (+GCpi): +0.18  
Neg. Internal Pressure (-GCpi): -0.18  
Velocity Pressure Exp. Coeff. (Kh): 0.94 @ z=h
Velocity Pressure (qh): 24.68 psf
End Zone Width (a): 3.00 ft.
Zone 2/2E Dist.: 12.00 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: 7 psf
Bottom Chord Dead Load: 10 psf
Truss/Rafter Spacing: 24 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 0.52 8.30 17.18
2 -0.69 -21.47 -12.58
3 -0.47 -16.00 -7.12
4 -0.42 -14.69 -5.81
1E 0.78 14.81 23.69
2E -1.07 -30.84 -21.96
3E -0.67 -21.06 -12.17
4E -0.62 -19.69 -10.81
2OH -0.69 -17.03
2EOH -1.07 -26.40
3OH -0.47 -11.56
3EOH -0.67 -16.61
2OH+W -0.69/-0.7 -33.99
2EOH+W -1.07/-0.7 -43.36
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 8420 Mt. View Rd 60108
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
2/3/2026 1
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Load Case B: Longitudinal Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 -0.45 -15.55 -6.66
2 -0.69 -21.47 -12.58
3 -0.37 -13.57 -4.69
4 -0.45 -15.55 -6.66
5 0.40 5.43 14.31
6 -0.29 -11.60 -2.71
1E -0.48 -16.29 -7.40
2E -1.07 -30.84 -21.96
3E -0.53 -17.52 -8.64
4E -0.48 -16.29 -7.40
5E 0.61 10.61 19.49
6E -0.43 -15.05 -6.17
2OH -0.69 -17.03
2EOH -1.07 -26.40
3OH -0.37 -9.13
3EOH -0.53 -13.08
2EOH+W -1.07/-0.7 -43.68
3EOH+W -0.53/-0.7 -30.35
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 - 2.08 4.30
2T A - -5.37 -3.15
3T A - -4.00 -1.78
4T A - -3.67 -1.45
5T B - 1.36 3.58
6T B - -2.90 -0.68
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 8420 Mt. View Rd 60108
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
2/3/2026 2
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Customer
Location
Job No.
Engr.
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5. Wind Load Calculations


1.) Lateral Loads - Transverse Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
57 ft.
6.00 ft.
51.00 ft.
130.0 plf
97.0 plf
97.7 plf
54.8 plf
4077 lbs
3750 lbs
50.5 plf
38.4 plf
74.0 plf
51.5 plf
63.4 plf
40.9 plf
13.0 plf
10.2 plf
39.9 plf
27.7 plf
5.0 plf
3.5 plf
1.5 ft.
1.5 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 9106 -810 -468 7828 4077 3750
Negative Internal Pressure 9106 -810 -468 7828 4077 3750
Roof Pressure = 0 9106 0 0 9106 4757 4349
Min. Pressures (8 psf, 16 psf) 6019 1094 202 7315 3658 3658
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 8420 Mt. View Rd 60108
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
2/3/2026 3
Subject
Customer
Location
Job No.
Engr.
Rev.
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2.) Lateral Loads - Longitudinal Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
24 ft.
3.00 ft.
21.00 ft.
99.3 plf
76.5 plf
70.0 plf
35.8 plf
23.1 lbs
91.9 lbs
137.9 lbs
245.2 lbs
1761 lbs
1605 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 2868 498 0 3366 1761 1605
Negative Internal Pressure 2868 498 0 3366 1761 1605
Roof Pressure = 0 2868 498 0 3366 1761 1605
Min. Pressures (8 psf, 16 psf) 2534 461 0 2995 1498 1498
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 8420 Mt. View Rd 60108
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
2/3/2026 4
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Customer
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Job No.
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3.) Roof Truss Reactions:


Roof Truss/Rafter Reactions: Transverse End Zone
225 lbs
103 lbs
Max. Horz. ① = 72 lbs
Max. Uplift ① = 225 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 40 622 94 88 6
Transverse End Zone 63 855 328 225 103
Longitudinal Int. Zone 43 552 25 48 -24
Longitudinal End Zone 72 768 240 181 60
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 24" 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 8420 Mt. View Rd 60108
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
2/3/2026 5