Uplift Pressure & Fastening Pattern Generator

Instructions: Fill out the fields on the left. The ASCE Design Details section sets design pressures, and the Construction Details section sets the fastening pattern. Generate a report using the buttons at bottom.

Customer Name

Company Name

Project Name

Project Area

Email Address

Project Square Footage

Street Address or Nearest Intersection

City

State

Postal / ZIP Code

Building Dimensions

Length (ft)

Width (ft)

Height (ft)

Parapet Height Select lowest parapet height that encompasses building.

ASCE Specifications

ASCE Version Get ASCE Version by location and international building code (IBC).

Risk Category

Enclosure Classification Partially Open Building applies to ASCE 7-16/7-22 only.

Exposure Category

Wind Speed Look up wind speed by location, ASCE version, risk category, and wind load type, then enter the value manually.

Florida Wind Speed by County (mph)

All buildings and structures shall be considered to be in Exposure Category C, unless Exposure Category D applies, as defined in Section 26.7 of ASCE 7.
Risk Category	Miami-Dade County	Broward County
I	165	156
II	175	170
III	185	180
IV	195	185

Construction Type

System Type

Deck Type

Fastener Type

Pullout Resistance is

Pullout Resistance (lbs)

ASCE Version & Design Pressure

(Design Details Pending)

Use Safety Design Pressure for Factory Mutual (FM) Assemblies
Design Wind Pressure	Zone 1'	Zone 1	Zone 2	Zone 3

System Design

(System Details Pending)

Follow Duro-Last Specifications for required perimeter enhancements.

Any pull values less than 210 lbs. must contact Engineering Services Department.

Buildings above 40 feet require Engineering Services to evaluate for special requirements.
Windcalc is not valid until reviewed by Engineering Services.
Material Types	Zone 1'	Zone 1	Zone 2	Zone 3

Report Options

Uplift Pressure Report
Projects located in Miami-Dade County
Projects located in the State of Florida
Projects located in designated catastrophe zones as defined by the Texas Department of Insurance (TDI)
When Zone Velocity Pressures are required for a roof system specification

Uplift Pressure & Fastening Pattern Report
Determine fastening pattern as required by the International Building Code (IBC)
Determine fastening pattern as required by Duro-Last Specification

Sections

ASCE Version
Risk Category
Enclosure Classification
Exposure Category

ASCE Version

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ASCE 7-10
Based on Chapter 30 (Sections 1 & 3) of the American Society of Civil Engineers (ASCE) Standard ASCE 7-10, Minimum Design Loads for Buildings and other Structures.
ASCE 7-16
Based on Chapter 30 (Sections 1 & 3) of the American Society of Civil Engineers (ASCE) Standard ASCE 7-16, Minimum Design Loads and Associated Criteria for Buildings and other Structures.
ASCE 7-22
Based on Chapter 30 (Sections 1 & 3) of the American Society of Civil Engineers (ASCE) Standard ASCE 7-22, Minimum Design Loads and Associated Criteria for Buildings and other Structures.

Risk Category

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Categories based on the risk to human life, health, and welfare associated with their damage or failure by nature of their occupancy or use for the purposes of applying flood, wind, snow, earthquake, and ice provisions.

¹Buildings and other structures containing toxic, highly toxic, or explosive substances shall be eligible for classification to a lower Risk Category if it can be demonstrated to the satisfaction of the Authority Having Jurisdiction by a hazard assessment as described in Section 1.5.3 that a release of the substances is commensurate with the risk associated with that Risk Category.
Risk Category I
Buildings and other structures that represent low risk to human life in the event of failure. (e.g. agricultural facilities, certain temporary facilities, minor storage facilities)
Risk Category II
All buildings and other structures except those listed in Risk Categories I, III, and IV. (e.g. warehouses, shipping/distribution, industrial, small restaurants, residential)
Risk Category III
Buildings and other structures, the failure of which could pose a substantial risk to human life. Buildings and other structures, not included in Risk Category IV, with potential to cause a substantial economic impact and/or mass disruption of day-to-day civilian life in the event of failure. Buildings and other structures not included in Risk Category IV (including, but not limited to, facilities that manufacture, process, handle, store, use, or dispose of such substances as hazardous fuels, hazardous chemicals, hazardous waste, or explosives) containing toxic or explosive substances where the quantity of the material exceeds a threshold quantity established by the Authority Having Jurisdiction and is sufficient to pose a threat to the public if released.¹ (e.g. school/institutions, government buildings, community gatherings)
Risk Category IV
Buildings and other structures designated as essential facilities. Buildings and other structures, the failure of which could pose a substantial hazard to the community Buildings and other structures (including, but not limited to, facilities that manufacture, process, handle, store, use, or dispose of such substances as hazardous fuels, hazardous chemicals, or hazardous waste) containing sufficient quantities of highly toxic substances where the quantity of the material exceeds a threshold quantity established by the Authority Having Jurisdiction and is sufficient to pose a threat to the public if released.¹ Buildings and other structures required to maintain the functionality of other Risk Category IV structures. (e.g. police/fire stations, hospital/medical clinic, emergency response, chemical processing, storm shelters)

Enclosure Classification

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For the purpose of determining internal pressure coefficients, all buildings shall be classified as enclosed, partially enclosed, partially open, or open as defined in Section 26.2.

A_o = total area of openings in a wall that receives positive external pressure, in ft²
A_oi = sum of the areas of openings in the building envelope (walls and roof) not including A_o, in ft²
A_gi = sum of the gross surface areas of the building envelope (walls and roof) not including A_g, in ft²
A_g = gross area of that wall in which A_o is identified, in ft²
Enclosed Building
A_o is less than the smaller of 0.01A_g or 4 sq ft (0.37 m) and A_oi∕A_gi ≤ 0.2
Enclosed Building with impact resistant doors/windows
Partially Enclosed Building
A_o > 1.1A_oi and A_o > the lesser of 0.01A_g or 4 sq ft (0.37 m) and A_oi∕A_gi ≤ 0.2
Partially Enclosed Building
Open Building
Each wall is at least 80% open.
Open Building
Partially Open Building
A building that does not comply with Enclosed, Partially Enclosed, or Open classifications
Partially Open Building

Exposure Category

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The Building's "exposure" is an important factor when estimating uplift pressures on a roof. The exposure is based on the ground surface roughness adjacent to the building (such as natural topography, vegetation, and constructed facilities).

For a site located in the transition zone between exposure categories, the category resulting in the largest wind forces shall be used.
Exposure B
For buildings or other structures with a mean roof height less than or equal to 30 ft (9.1 m), Exposure B shall apply where the ground surface roughness, as defined by Surface Roughness B, prevails in the upwind direction for a distance greater than 1,500 ft (457 m). For buildings or other structures with a mean roof height greater than 30 ft (9.1 m), Exposure B shall apply where Surface Roughness B prevails in the upwind direction for a distance greater than 2,600 ft (792 m) or 20 times the height of the building or structure, whichever is greater. Surface Roughness B: Urban and suburban areas, wooded areas, or other terrain with numerous, closely spaced obstructions that have the size of single-family dwellings or larger.
FIGURE C26.7-5(a) Exposure B: Suburban Residential Area with Mostly Single-Family Dwellings. Low-Rise Structures, Less Than 30 ft (9.1 m) High, in the Center of the Photograph Have Sites Designated as Exposure B with Surface Roughness Category B Terrain around the Site for a Distance Greater Than 1,500 ft (457 m) in Any Wind Direction
FIGURE C26.7-5(b) Exposure B: Urban Area with Numerous Closely Spaced Obstructions Having the Size of Single-Family Dwellings or Larger. For All Structures Shown, Terrain Representative of Surface Roughness Category B Extends More Than 20 Times the Height of the Structure or 2,600 ft (792 m), Whichever Is Greater, in the Upwind Direction
FIGURE C26.7-5(c) Exposure B: Structures in the Foreground Are Located in Exposure B. Structures in the Center Top of the Photograph Adjacent to the Clearing to the Left, Which Is Greater Than Approximately 656 ft (200 m) in Length, are Located in Exposure C When Wind Comes from the Left over the Clearing. (See Figure C26.7-4)
Exposure C
Exposure C shall apply for all cases where Exposure B or D does not apply. Surface Roughness C: Open terrain with scattered obstructions that have heights generally less than 30 ft (9.1 m). This category includes flat, open country and grasslands.
FIGURE C26.7-6(a) Exposure C: Flat Open Grassland with Scattered Obstructions Having Heights Generally Less Than 30 ft (9.1 m)
FIGURE C26.7-6(b) Exposure C: Open Terrain with Scattered Obstructions Having Heights Generally Less Than 30 ft (9.1 m). For Most Wind Directions, all One-Story Structures with a Mean Roof Height Less Than 30 ft (9.1 m) in the Photograph are Less Than 1,500 ft (457 m) or 10 Times the Height of the Structure, Whichever Is Greater, from an Open Field that Prevents the Use of Exposure B
Exposure D
Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails in the upwind direction for a distance greater than 5,000 ft (1,524 m) or 20 times the building or structure height, whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 ft (183 m) or 20 times the building or structure height, whichever is greater, from an Exposure D condition as defined in the previous sentence. Surface Roughness D: Flat, unobstructed areas and water surfaces. This category includes smooth mud flats, salt flats, and unbroken ice.
FIGURE C26.7-7 Exposure D: A Building at the Shoreline (Excluding Shorelines in Hurricane-Prone Regions) with wind Flowing over Open Water for a Distance of at Least One Mile. Shorelines in Exposure D Include Inland Waterways, the Great Lakes, Coastal Areas of California, Oregon, Washington, and Alaska