ASCE 7 Calculator
- Deck Type
- 22 Guage or Heavier Steel
- Membrane Type
- TPO
- Building Height
- 5 Feet
- Exposure
- B
- Wind Speed Coefficient - Wind Speed-Up Over Hills, Ridges and Escarpments
- 1
- Wind Speed Directionality
- 0.85
- Basic Wind Speed (ASCE7 Hazard Tool / ATC Hazards by Location)
- 105 MPH
- Risk Category (Choose based on Building Category and Location)
- Category III
- Safety Factor(SF) (Should be determined by your Architect or Specifier)
- 1
- Internal Pressure(IP)
- Enclosed Buildings
ASCE-7 Calculations
- Field 0 Pressure
- -10.9 PSF
- Field Pressure
- -19 PSF
- Perimeter Pressure
- -25.0 PSF
- Corner Pressure
- -34.1 PSF
Roof Design Type
- Roof Design Type
- Not Yet Selected
The wind uplift resistance capability of adhered and mechanically fastened flexible membrane roofing systems has a direct relation to the uplift pressure. The selected system must be capable of resisting the calculated design uplift pressure. Proof of uplift resistance shall come from a third-party certification test report documenting performance (such as Directory of Roofing Assemblies (dora), FM Global, independent testing, etc.).
The certification test report shall indicate the uplift capacity (in psf). This tested uplift resistance capacity shall be directly compared to the calculated field design pressure to determine suitability, if the tested resistance pressure meets or exceeds the field design pressure, the system is suitable for use. If the tested resistance pressure is less than the field design pressure, the system is not suitable for use on that particular building.
Now compare the tested pressure to the perimeter and corner calculated design pressures. If the tested pressure meets or exceeds these calculated design values, the system, as tested, is suitable for use across the entire roof area.
In some instances, the tested uplift pressure will exceed the calculated field design pressure, but be less than the perimeter or corner design pressures. When this happens, extrapolation of the tested assembly to meet the perimeter and comer design pressures is necessary.
For the calculator to determine the amount of additional fasteners required for insulation attachment for an adhered system or width of perimeter sheets for a mechanically fastened system, choose a system first