b'THE OFFICIAL NFBA MAGAZINEcontinued from page: 21vertical insulation at the edge of the concrete slabAaron Halberg, PE, is a member of Halberg Engineering, on grade and the disadvantage of using a sand layerLLC, Hayward, Wisconsinbetween the concrete slab and a below-grade vaporReferencesbarrier. It then presented three viable construction detailsforeffectivelyinsulatingthebuildingAmerican Society of Heating, Refrigerating and Air-foundation for embedded-post projects. Conditioning Engineers. (2019). Energy Standard for Situations for applying or waiving the vestibuleBuildings Except Low-Rise Residential Buildings. ANSI/requirement. Just as air leaking through a buildingsASHRAE/IESNA 90.1 Atlanta, GA: ASHRAE.shell renders the insulation useless, frequently usedBohnhoff, D. R. (2010). Below-grade insulation for post-exterior doors can drastically increase the amountframe buildings, Part II: Preventing heat transfer. Frame RESEARCH & TECHNOLOGYof energy required to heat or cool the building asBuilding News, 26(2), 5663.unconditioned outside air enters the conditioned space. The energy code default requirement is thatDoor and Access Systems Manufacturers Association all exterior doors shall have vestibules to minimizeInternational. (2017). Test Method for Thermal Transmittance air infiltration, but some exemptions listed in theand Air Infiltration of Garage Doors. ANSI/DASMA 105-IECC could eliminate most (if not all) requirements2017. Cleveland, OH: DASMA International.for vestibules in your Post-Frame project. You shouldInternational Code Council, Inc. (2018). International be aware of the requirement and the exemptionsEnergy Conservation Code and Commentary. Country early in your project development. Club Hills, IL: ICC, Inc.Figure 3:The example problem from IECC commentary (2015 edition) is re-presented here, to show how simple math is used in the method, where U-values (proposed design and code benchmarks) are multiplied by areas (or lengths).As with golf scores and U-values, lower values are better, so compliance is achieved if the sum of all sections A through E is less than or equal to zero.22 / FRAME BUILDER - VOL5 5'