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Enter all data relating to size, dimension and overall building information. The roof pitch may have any value between 0.5 : 12 and 8 : 12 (if the eave height constraints allow it). Overall width of the building. Overall length of the building. Choices are:
Choose the proper building sheeting condition. "Enclosed" means the building is completely enclosed in some material. That material can vary from sheets, masonry, or even another enclosed building. "Partially Enclosed" means either the building is completely open to a given elevation, or that part of the building is open and part is enclosed. "Open" means that the building is completely open to remain open. Eave height to the back of the building. Eave height to the front of the building. The following profiles are supported:
Choices are tapered and straight (tapered is default). Choosing a straight rafter over a tapered is typically to achieve a particular design style. There is little to no benefit of having a straight (constant depth) over tapered outside of architectural design considerations. Buildings utilizing constant depth rafter members usually have the rafters exposed and are a part of a design finish and allow a more consistent look throughout the roof system.
Constant depth rafters are usually more costly than tapered.
Column types are straight and tapered (tapered is default). Some projects may require the use of straight columns for a particular finish result.
Tapered columns are the industry standard and are usually the optimum choice, and less costly than straight columns. The larger the building is the more economical tapered members become. Large spans utilizing straight rafters will be more costly than with tapered members.
Every metal building has some type of base connection along the building perimeter, allowing the connection of sheeting. This "base condition" determines exactly how the panels connect to the foundation. To prevent water and pests from entering the building at the base, panels extend below the finished floor of the building.
The following base conditions are supported:
Bypass sidewall girts are the most economical choice. However, applications require more clearance between columns. Choosing flush sidewall girts will inset the rigid frame into the girt cavity, thus creating a slightly larger clearance between the rigid frames. Many schools and retail applications utilize flush sidewall systems. Defines the number of inset roof bays. At least one bay must remain not being inset. When the building width exceeds 165 ft, the frames need to be supported by interior columns and the building becomes a so-called modular building. Click the link to popup the Interior column editor. The self-weight of the pre-engineered building structure including all its components such as frames, floors, secondary members, sheeting, bolts, etc. If you are removing sheets from the roof, and adding other materials such as plywood, concrete or built-up roofing, please enter the PSF weight of the system being used. Determine the correct roof live load, if your local code stipulates that load reduction is not allowed uncheck the “Load Reduction Allowed.” Roof Live load is defined as "Loads that are produced (1) during maintenance by workers, equipment, and materials and (2) during the life of the structure by movable objects but does not include wind, snow, seismic or dead loads." Tributary Reduction is a reduction of the Roof Live Load based on the idea that the larger roof area that is supported by a member; the less likely it is that area will be loaded to its limit. This reduction is allowed by most building codes, but some local jurisdictions do not allow it. Check with your local Building Department to be sure.
A clear distinction is made between “live” and “snow” loads. It is important that these two loads be treated separately because the probabilities of occurrence for snow loads are very different from those for roof live loads. Roof live load defined by the model codes is a reducible 20 pounds per square foot. In the northern US, design of a building to withstand snow loading is critical. Snow loading is dependent on several factors. These factors include roof slope, if the structure is heated, if the structure is insulated, if the roof slope is slippery or if it contains high friction that will "hold" the snow on the roof. IQS uses the most conservative of these factors into consideration when designing your building. The collateral load is the loading on the building caused by additional construction materials such as a false ceiling, sprinkler system, lighting, Heating/Air-conditioning duct, etc. The following table is recommended loadings for each type of collateral load.
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