b'THE OFFICIAL NFBA MAGAZINETWO STORY POST-FRAME BUILDINGSDimitry Reznik PE Amanda Stauffer Eric Wriglesworth PE P ost-frameconstructionhasseveralTimbertech Timbertech TimbertechTECHNOLOGY & RESEARCHcharacteristics that make it a great choice for all types of applications, whether it is commercial, residential, or agricultural. The goal of any building project is to design a building that meets all of the owners needs in the mostconstruction can be done per a UL tested assembly efficient way possible. A multi-story building isor per a calculated method in Section 722 of the often an appealing solution for projects since itIBC. An additional resource for the calculated adds usable space without increasing the overallfire resistance rating of exposed wood members footprint of the building. An often-overlookedand wood decking is chapter 16 of the ANSI/feature of post-frame construction is the ability toAF&PA National Design Specification for Wood easily incorporate a second story into the building.Construction (NDS). Generally, the fire resistance While there are items that need to be taken intoof a wood frame assembly is equal to the sum of consideration early in the design process, a two- the time assigned to the membrane on the fire story post-frame building can achieve the same desired results as other construction methods. exposed side, the time assigned to the framing members, and the time assigned for additional The International Building Code (IBC), whichitems such as insulation (IBC section 722.6.2.1). applies to commercial buildings, does have specificUL designs U528 and V304 are examples of a requirements related to multi-story buildings.post-frame 1-hour wall assembly. Since type VB Chapter 5 & 6 of the IBC provides the designconstruction can limit buildings to a single story constraints based upon the occupancy/use groupfor several commercial uses, VA is the alternative classification and construction types, which are theoption for using wood/combustible materials primary factors in determining most of the otherand being permitted to have an additional story. building code requirements found in later chapters.If a full second story is not feasible with the The types of construction are based upon whetherbuilding code requirements, a mezzanine may the primary structural components of a buildingstill be an option. While the structural framing are combustible or non-combustible or offer a fireof a mezzanine is similar to framing for a second resistance rating. Typical post-frame constructionfloor, the building code looks at these two spaces is classified as wood frame construction withdifferently and has different requirements. By no level of fire rated protection on the primarydefinition, a mezzanine is an intermediate level components. This is known as Type VB. The otherbetween the floor and ceiling of any story. A sub-category for type V construction is VA. VAmezzanine is limited in size to 1/3 of the area of construction provides a 1-hour fire resistantthe space below that it is open to. A mezzanine is rating to the primary structural components.also required to be open, not enclosed. As always, Ways to achieve a 1-hour rated assembly for wood continued on page: 2422 / FRAME BUILDER -JAN2020'