This sub-page determines wind load of the roof for buildings of any height as per ASCE 7-10 Chapter 30 Part 2. Wind loads are determined for the roof from wind in any direction.

### Assumptions

1. Mean roof heights, h ≤ 500 ft (= 150 meters)
2. Major structural components supporting tributary areas > 700 ft^2 shall be permitted to be designed using the provisions for main wind force resisting systems (MWFRS)
3. Effective area, Ae for a component or cladding panel is:
a. Ae = span length x effective width > 1/3 span length
b. Ae = h^2 / 3 for a vertically spanning concrete masonry unit (CMU) or concrete wall
1. Enclosed, partially enclosed and partially open buildings. Calculator is not applicable for open buildings.
2. Applicable for Gable roof with roof angle, θ ≤ 45 degrees, or Monoslope roof with roof angle, θ ≤ 3 degrees. For flat roofs (θ = 0 degrees) use either Gable (G) or Monoslope (M) for "Roof Type". Gable roof is symmetrical.
3. Sign convention of wind pressures: + is acting toward the surface, - is acting away from the surface
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### Building properties

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Building Classification
:III
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Enclosed? (Y/N)
:Y
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Roof Type
:Gable
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Ridge Height, hr
:42ft
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Eave Height, he
:42ft
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Building Width, B
:222ft
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Building Length, L
:204ft
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Component Name
:Joist
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Effective Area, Ae =
:208sqft
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Overhangs? (Y/N)
:N
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### Wind and site properties

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Exposure Category
:C
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Wind Speed, V
:170mph
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Topographic Factor, Kzt
:1
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Directional Factor, Kd
:0.85
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Hurricane Region?
:N
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### Building properties

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Roof Angle, θ
:0.0deg
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Mean Roof Height, h
:42.0ft
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Width of Zone 2 (edge), a
:16.8ft
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Width of Zone 3 (corner)
:16.8ft
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### Velocity pressure, qh

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Velocity pressure coefficient, Kh
:1.05435523493483
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Velocity pressure, qh (lb/ft^2)
:66.3046050462057
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### Wind pressure coefficients

Roof external pressure coefficient, GCp
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 0.2​ -0.9​ -1.1​ -1.1​
Internal pressure coefficient, GCpi
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 0.18​ -0.18​
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### ⬆️ Design wind load pressures, p

Wind load tabulation for Roof Components and Cladding. For zone definitions of gable and monoslope roofs, refer to diagrams below.
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 Kh​ qh​ Joist​ 0​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ 15​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ 20​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ 25​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ 30​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ 35​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ 40​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ For z = hr:​ 42​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 42​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​ 42​ 1.05​ 66.3​ 25.2​ -71.61​ -84.87​ -84.87​
The diagrams are from Figure 30.3-2A to 2D and Figure 30.3-5A to 5B of ASCE 7-22.
❗The roof zone diagrams between ASCE 7-10 and ASCE 7-22 differ. Use the ASCE 7-22 diagrams as provided below.

### Gable Roof Zones for GCp

h ≤ 60 ft and θ ≤ 7°
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h ≤ 60 ft and 20° ≤ θ ≤ 27°
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h ≤ 60 ft and 7° ≤ θ ≤ 20°
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h ≤ 60 ft and 27° ≤ θ ≤ 45°

### Monoslope Roof Zones for GCp

h ≤ 60 ft and 3° ≤ θ ≤ 10°
h ≤ 60 ft and 10° < θ ≤ 30°
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