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Wind Load Report - New ADU

1. Site & Building Data

Roof Type: Gable  
Wind Speed (ult): 110 mph
Exposure Category: C  
Enclosure Class: Enclosed  
Building Width (W): 25 ft.
Building Length (L): 46 ft.
Eave Height (he): 10 ft.
Foundation Height (hf): 0 ft.
Roof Pitch: 12 /12
Eave Overhang (OHe): 2 ft.
Gable Overhang (OHg): 2 ft.

2. Parameters & Coefficients

Topographic Factor (Kzt): 1.0
Directionality Factor (Kd): .85
Roof Angle (θ): 45.00 deg.
Mean Roof Height (h): 16.25 ft.
Ridge Height (hr): 22.50 ft.
Pos. Internal Pressure (+GCpi): +0.18  
Neg. Internal Pressure (-GCpi): -0.18  
Velocity Pressure Exp. Coeff. (Kh): 0.86 @ z=h
Velocity Pressure (qh): 22.73 psf
End Zone Width (a): 3.00 ft.
Zone 2/2E Dist.: 12.50 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 0.56 8.64 16.82
2 0.21 0.68 8.86
3 -0.43 -13.87 -5.68
4 -0.37 -12.50 -4.32
1E 0.69 11.59 19.78
2E 0.27 2.05 10.23
3E -0.53 -16.14 -7.96
4E -0.48 -15.00 -6.82
2OH 0.21 4.77
2EOH 0.27 6.14
3OH -0.43 -9.77
3EOH -0.53 -12.05
2OH+W 0.21/-0.7 -10.87
2EOH+W 0.27/-0.7 -9.51
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 985 Civic Center Dr Santa Clara 50304
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
3/7/2025 1
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Load Case B: Longitudinal Direction
Surface GCpf Design Pressure (psf)
(w/ +GCpi) (w/ -GCpi)
1 -0.45 -14.32 -6.14
2 -0.69 -19.78 -11.59
3 -0.37 -12.50 -4.32
4 -0.45 -14.32 -6.14
5 0.40 5.00 13.18
6 -0.29 -10.68 -2.50
1E -0.48 -15.00 -6.82
2E -1.07 -28.41 -20.23
3E -0.53 -16.14 -7.96
4E -0.48 -15.00 -6.82
5E 0.61 9.77 17.96
6E -0.43 -13.87 -5.68
2OH -0.69 -15.68
2EOH -1.07 -24.32
3OH -0.37 -8.41
3EOH -0.53 -12.05
2EOH+W -1.07/-0.7 -40.23
3EOH+W -0.53/-0.7 -27.96
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 - 2.16 4.21
2T A - 0.17 2.22
3T A - -3.47 -1.42
4T A - -3.13 -1.08
5T B - 1.25 3.30
6T B - -2.67 -0.63
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 985 Civic Center Dr Santa Clara 50304
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
3/7/2025 2
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5. Wind Load Calculations


1.) Lateral Loads - Transverse Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
46 ft.
6.00 ft.
40.00 ft.
45.0 plf
37.5 plf
34.8 plf
25.9 plf
4487 lbs
4171 lbs
121.0 plf
104.0 plf
-15.3 plf
-5.1 plf
-46.0 plf
-35.8 plf
11.4 plf
13.0 plf
90.4 plf
73.3 plf
14.5 plf
11.7 plf
2 ft.
2 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 3015 5183 460 8658 4487 4171
Negative Internal Pressure 3015 5183 460 8658 4487 4171
Roof Pressure = 0 3015 0 0 3015 1550 1465
Min. Pressures (8 psf, 16 psf) 2208 2760 720 5688 2844 2844
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 985 Civic Center Dr Santa Clara 50304
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
3/7/2025 3
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2.) Lateral Loads - Longitudinal Direction:


Lateral Loads on Roof Diaphragm with Positive Internal Pressure
25 ft.
3.00 ft.
22.00 ft.
41.6 plf
32.1 plf
29.3 plf
15.0 plf
63.8 lbs
268.2 lbs
424.6 lbs
735.2 lbs
1410 lbs
1329 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 1248 1492 0 2740 1410 1329
Negative Internal Pressure 1248 1492 0 2740 1410 1329
Roof Pressure = 0 1248 1492 0 2740 1410 1329
Min. Pressures (8 psf, 16 psf) 1200 1500 0 2700 1350 1350
a) Bottom half of wall neglected in tributary area calculations.
b) Strength design values multiplied by 0.6 to obtain ASD values.
Wind Loads 985 Civic Center Dr Santa Clara 50304
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
3/7/2025 4
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3.) Roof Truss Reactions:


Roof Truss/Rafter Reactions: Transverse End Zone
-262 lbs
-119 lbs
Max. Horz. ① = 279 lbs
Max. Uplift ① = 117 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 -216 247 -397 -252 -145
Transverse End Zone -279 263 -381 -262 -119
Longitudinal Int. Zone 127 542 -103 -15 -88
Longitudinal End Zone 214 756 111 117 -6
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 985 Civic Center Dr Santa Clara 50304
Engineer Name ENGINEERING COMPANY INC.
Street Address City, CA 99999
ph. (800) 000-0000    www.website.com 		-
3/7/2025 5