COLUMN BUILDING SCIENCES FIGURE 1 Rigid insulation and wood blocking for air sealing to provide thermal isolation between the occupied space and the garage. Interior Space Sealant, Adhesive or Gasket Blocking or Solid Joist Positioned Over Wall to Act As Draftstop Sealant or Adhesive Around Four Edges Taped or Sealed Joints Rigid Insulation Gypsum Board Unconditioned Garage Sealant, Adhesive or Gasket Seal Electrical Penetrations Electrical Wire Interior Space PHOTO 3 OSB blocking that is notched and sealed around wood I-joist floor framing. PHOTO 4 Gypsum board blocking used with a floor truss assembly. Note the location of a vertical member within the floor truss to simplify the installation of the truss air sealing gypsum board air sealing blocking. PHOTO 2 Rigid insulating sheathing installed on the wall separating the house from the garage. Note that the rigid insulation assembly will need to meet applicable fire rating requirements. FIGURE 3 Slab foundation. Slab foundation thermal isolation. Garage Exterior FIGURE 2 Basement foundation. Attached garage thermal isolation. Interior Garage Sealant, Adhesive Or Gasket (typ.) Sealant Sill Gasket (Capillary Break) 3/8 in. Fiber Cement Rigid Insulation (Taped or Sealed Joints) Basement Sill Gasket (Capillary Break) House Soil-bearing conditions can support stem wall with fl oating slab, with slab insulation installed below wall that separates conditioned space from garage. Sill Gasket (Capillary Break) of the rigid insulation rather than gypsum board. Where slab foundations are common, effective thermal isolation is illustrated in Figure 3. Figure 4, Photo 5 and Photo 6 illustrate the insulation detail at the stem wall portion of the garage foundation. Photo 7 illustrates the use of spray foam cavity insulation on the walls separating the garage from the A U G U ST 2 0 2 4 ashrae.org ASHRAE JOURNAL 29http://www.ashrae.org