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Thank you for using the Uplift Pressure and Fastening Pattern Generator!

UPLIFT PRESSURE AND FASTENING PATTERN GENERATOR 1.2

GENERAL INFORMATION

Prepared By

Prepared For (Optional)

Provide a valid email address

Project


BUILDING LOCATION

Project Address



Latitude, Longitude:  

Search Results

Address:
Lat/Lng:

Locate Roof Area

DRAG the marker to the roof area you are interested in. Holding down the mouse button will allow you to pan the map. You can also resize the image with the tool provided.

If the building is not shown on the air photo click the approximate location. The latitutude and longitude of this location will be used to determine the Design Wind Speed used in the calculations.

Once the marker is in the correct location, click the SUBMIT LOCATION button

Marker Lat/lng:
Current Zoom Level:
City:
County:
State:

ASCE VERSION, PARAMETERS AND DESIGN WIND SPEED

Select the version of ASCE 7 to use


Choose Building Risk Category


Choose Building Enclosure Category


Choose Building Exposure Category

On the location image, zoom out to see red circles spaced at 500 foot increments to assist in determining the exposure category.


Design Wind Speed

The Design Wind Speed shown is from the ASCE 7 Specification and used as the minimum value. You may adjust the wind speed upward but not downward.

The project location is in a Special Wind Region. Please ensure that the values for Design Wind Speed, ASCE version and Risk Category are correct per the local building department or project design professional.

BUILDING DIMENSIONS AND CONSTRUCTION INFORMATION

Roof Dimensions, Height and Construction:

Dimensions: ft    X    ft
Height: ft  
Construction Type:
Roof Deck Type:
Fastener Type:
Pullout Resistance: lb.    
Pullout Resistance Is:

REPORT OPTIONS

Uplift Pressure Report

    Used for the following:
  • 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

Fastening Pattern Report

    Used for the following:
  • Determine fastening pattern as required by the International Building Code (IBC).
  • Determine fastening pattern as required by Duro-Last Specification.

FASTENING PATTERN

Use the spinners below to set the distance between rows of fasteners.

The table below the spinners shows the maximum spacing between fasteners installed along these rows for each roof zone.

Pullout Resistance: lb.
Perimeter Width: ft.
  Fastener Row Spacing:
  " OC " OC " OC
Fastener Spacing Zone 1: " OC " OC " OC
Fastener Spacing Zone 2: " OC " OC " OC
Fastener Spacing Zone 3: " OC " OC " OC

Uplift Pressure and Fastening Pattern Generator

This tool enables you to determine the expected wind uplift pressures on a roof as well as the fastening patterns required to attach the roof system to resist these pressures. After collecting pertinent information about the project the pressures and fastening patterns will be calculated and made available to you in report form. You may request a report summarizing only the pressures or a report showing the fastening pattern and pressures, or both.


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Panel 1 Help

ASCE 7 Version

The current version of ASCE 7 Minimum Design Loads for Buildings and Other Structures is the 2010 edition (7-2010).

Not all states and jurisdictions have adopted this version yet and are still using the 2005 edition (7-05). If you are unsure which version applies to your project contact your building department for assistance.

Risk Categories

Category I

Buildings and other structures that represent a low risk to human life in the event of failure (e.g., agricultural facilities, certain temporary facilities, minor storage facilities).

Category II

All buildings and other structures except those listed in Risk Categories I, III, and IV

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 their quantity exceeds a threshold quantity established by the authority having jurisdiction and is sufficient to pose a threat to the public if released.

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 exceeds a threshold quantity established by the authority having jurisdiction to be dangerous to the public if released and is sufficient to pose a threat to the public if released*.

Buildings and other structures required to maintain the functionality of other Risk Category IV structures.

* Buildings 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 1.5.2 that a release of the substances is commensurate with the risk associated with that Risk Category.

Building Enclosure

Enclosed

A building that does not comply with the requirements for open or partially enclosed buildings.

Open

A building having each wall at least 80 percent open.

Partially Enclosed

A building that complies with both of the following conditions:

  • The total area of openings in a wall that receives positive external pressure exceeds the sum of the areas of openings in the balance of the building envelope (walls and roof) by more than 10 percent.
  • The total area of openings in a wall that receives positive external pressure exceeds 4 ft2 (0.37 m2) or 1 percent of the area of that wall, whichever is smaller, and the percentage of openings in the balance of the building envelope does not exceed 20 percent.

Exposure Categories

The Buildings "exposure" is an important factor when estimating uplift pressures on a roof. The exposure is based on the ground roughness adjacent to the building. Continue reading below for definitions of exposure categories.

Exposure B

For buildings with a mean roof height of 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 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, whichever is greater.

Surface Roughness B: Urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of single-family dwellings or larger.

Exposure C

Exposure C shall apply for all cases where Exposures B or D do not apply.

Surface Roughness C: Open terrain with scattered obstructions having heights generally less than 30 ft (9.1 m). This category includes flat open country and grasslands.

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 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 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.

For a site located in the transition zone between exposure categories, the category resulting in the largest wind forces shall be used.

Hurricane Prone Region

Areas vulnerable to hurricanes; in the United Staates and it's territories defined as:

  • The U.S. Atlantic Ocean and Gulf of Mexico coasts where the basic wind speed is greater than 90 mi/h, and
  • Hawaii, Puerto Rico, Guam, Virgin Islands and America Somoa.

Design Wind Speed

The Design Wind Speed will be assigned based on the latitude and longitude of the building location. If your project is in a special wind region or outside the United States and it's territories, you will be asked to enter the wind speed to use for the calculations. Contact your building department for the proper wind speed and ASCE version to use.

The wind speed set by this program will be treated as the minimum acceptable for use. You may adjust it upwards which will result in higher uplift pressures and more rigorous fastening patterns, but you cannot adjust it downward.

The ASCE 7 Specification includes Basic Wind Speed Maps used to assign wind speeds. One of the major differences between ASCE 7-05 and 7-10 is found in these maps.

  • ASCE 7-05 uses one set of wind speed maps and accounts for the buildings Risk Category within the calculations.
  • ASCE 7-10 uses separate wind speed maps for each Risk Category. Wind speeds used in 7-10 are higher than those used in 7-05 since these wind speeds account for the buildings risk factor.

Roof Dimensions

The dimensions and height of the building are used to determine the width of the perimeter areas of the roof (Zones 2 and 3) where fastening is increased in anticipation of higher uplift pressures. The roof height is also used in conjunction with the Basic Wind Speed to determine the Velocity Pressure expected at that height.

The width of the perimeter is:

  • 10% of the least horizontal dimension, OR
  • 40% of the height.

Refer to the images below for the configuration of roof zones and how to measure the height for both low slope (up to 1.5 per 12) and steeper sloped roofs.




Uplift Pressure Report

The Uplift Pressure Report can be used in determining which tested roof assemblies can be used as required by the State of Florida, Miami-Dade County (NOAs) and the Texas Department of Insurance (TDI).

When necessary, the report can be submitted for review by an engineer or used in a submittal package.

If you are using this tool do generate a fastening pattern you do not need to generate this report since the fastening pattern report available on the next panel includes all of the uplift pressures and the fastening pattern.



Fastening Pattern Report

The fastening pattern report includes uplift pressure information in addition to the fastening patterns that may be used for the roof system to resist these uplift pressures.

When necessary, the report can be submitted for review by an engineer or used in a submittal package.



Panel 6 Help

LEGEND: Needs Attention Completed Currently Locked Help

Please read this disclaimer prior to using the
Uplift Pressure / Fastening Pattern Tool
referred to here as the 'Tool'.

This Tool can be used to generate expected uplift pressures on roofs using calculations outlined in the American Society of Civil Enginner's ASCE 7 specification Minimum Design Loads for Buildings and Other Structures (2005 or 2010 editions).

The uplift pressures are used to generate a report that can be reviewed by a licensed Engineer, when required, and/or utilized to determine tested roof assemblies appropriate for a roofing project. The Tool also utilizes these pressures to create a report outlining roof system fastening patterns which will meet Duro-Last's requirements for the roofing project.

The proper calculation of uplift pressures and fastening patterns is reliant upon information provided by the user of this Tool, the accuracy of which Duro-Last has no control over. The user of this Tool is responsible for seeking assistance, if necessary, in order to provide accurate information.

The user of any report created with this Tool is solely responsible for its content and accuracy with respect to complying with Duro-Last Roofing Specifications, project requirements and all applicable regulatory codes.

Duro-Last, its employees and independent sales personnel representing Duro-Last EXPRESSLY DISCLAIM any and all responsibility for any errors, omissions or misrepresentations and are not liable for damages (direct or consequential, including but not limited to loss of profits) or damage to buildings or their contents, with respect to the use of this Tool and/or any reports created through its use.



A Note On Applicable Systems:

Fastening Patterns

Currently, this tool creates fastening patterns for mechanically attached membrane only. The following capabilities will be added in the future:

  • Board Fastening Patterns for Adhered Systems
  • Fastening Patterns for Duro-Bond (i.e. Inductive Weld) Systems

If you need assistance with fastening patterns not covered by this tool, contact Duro-Last's Engineering Services Department (800-248-0280).

Uplift Pressures

The tool is capable of generating zone velocity pressures which can be used to select appropriate tested roof assemblies and, when necessary, submitted to a licenced engineer for review and approval.

Special Wind Region

The address submitted is located in a Special Wind Region within which wind speeds can vary greatly. No wind speed is shown on the ASCE 7 Wind Speed Maps for this location.

In the following panel you will be asked to supply:

If you know these values click CONTINUE

If you do not know these values click EXIT and then contact the building department or the design professional responsible for the project in order to attain these values.

Looking up wind speeds for this location...
Creating Report...