Winde RTW/Windows

Disclaimer & Limitations

The results provided in this program are intended to be used as an aid to a qualified design professional for the design of roof to wall uplift connections and building components and cladding to resist wind loads. While these components are important in the overall wind resistance of a structure, design of a continuous load path and other load-resisting components and load directions must be performed for a complete design. For a complete design to resist wind loads, a professional engineer should be consulted. Consult your local structural engineer, architect and code official for verification of design pressure requirements and to answer any questions you may have regarding the codes and standards governing construction in your local area. The design pressure numbers provided in this app are estimates only.


Loads and pressures provided by this program are ASD loads and pressures. The design values calculated from ASCE 7-10 have been multiplied by 0.6 in accordance with Section 2.4 in ASCE 7-10.

Mean roof height, h ≤ 60 ft

Gust Effect Factor, G = 0.85 (Rigid building).

Internal pressure coefficient, GCpi = 0.18

Roof-to-wall Loads are based on an enclosed structure using the Directional Procedure (Section 27.4) of ASCE 7-10.

Window design wind pressures are based on an enclosed structure using the Low-rise Buildings provisions of Section 30.4 in ASCE 7-10.

See definition of "Building, Enclosed" in ASCE 7-10.

In Wind-borne Debris Regions (as defined in Section 26.2 of ASCE 7-10), the calculations assume all glazed openings are impact-resistant glazing or are protected with an impact-protective system. See Section 26.10 in ASCE 7-10.

For Roof to Wall Loads

Roof angle, θ ≥ 20 degrees

Building width = the span length of the roof trusses or twice the span length of an individual rafter.

Building length = horizontal building dimension parallel to the ridge.

Roof-to-wall loads are the maximum roof-to-wall loads for the building dimensions chosen. Lower loads may be determined by a professional engineer at some point away from away from the edge of the building for buildings with lengths that exceed the mean roof height.