b'THE OFFICIAL NFBA MAGAZINEcontinued from page: 137 or the AHJ. Risk Category may be built-in tosimplified but remember that each building and the prescribed pvalue for ASCE 7 in the 2022all load paths within it must be designed for the Gand future editions, or via a Snow Importanceproper design loads.Factor applied in 2016 and prior editions. Ground1.Partially Enclosed BuildingsSnow Load (p[psf]) is converted to Roof Snow GLoad ( p S[psf]) by several factors and this RoofPartiallyenclosedbuildingscanprovide Snow Load is used in structural analysis. Sinceeconomical, roof-covered areas for applications both loads have the same units, it is particularlywhere ventilation is desirable such as livestock TECHNOLOGY & RESEARCHimportant to be clear about WHICH Snow Loadshelters (Figure 1) or vehicle storage (Figure 2), value is being discussed (Ground or Roof).but these buildings will generally have larger roof Snow drifting over ridges and at roof steps (high/ uplift forces, fewer shear walls for lateral load path low conditions) is a SIGNIFICANT factor in manydesign, and more horizontal pressure on the wall areas and can cause accumulation of snow incomponents where walls are present (Figure 3). great excess of the normal snow load for a gableExtra attention to connection capacities is required roof.Snow drifting potential must be consideredto resist these loads which will be higher than for carefully from multiple sources: new tall buildingsa similarly sized building that is fully enclosed: may create snow drift potential on lower structuresroof panels to purlins, purlins to trusses, trusses to nearby, existing tall structures may result in snowcolumns, trusses to headers, headers to columns, drifts on new buildings, and even silos, industrialand columns to foundation.towers or tall trees may result in snow drifts that should be considered.Much like the discussion of choosing a more conservative Risk Category, project stakeholders can and should be given the opportunity to specify values that exceed the code minimum requirements for any or all of these: Design Wind Speed (V [mph]), velocity wind pressure (q[psf]), hGround Snow Load (p [psf]), or Roof Snow Load (p[psf]). G SCommon Post-Frame ChallengesA key concept in structural design is to considerFigure 1 An example of a Partially Enclosed Buildingan entire load path, or the continuous chain of structural elements that an external load goes through from the source to the foundation. Loads or forces must be successfully transferred along the entire load path and this chain will only be as strong as the weakest link.Some challenges based on the authors experiences are presented as a resource for the reader to consider in current and future building projects. These examples are admittedly very brief andFigure 2 Vehicle Storage - Partially Enclosed14 / FRAME BUILDER - NOV2022'