COLUMN BUILDING SCIENCES FIGURE 5 ICF Roof Truss. The air seal connection between the ceiling gypsum board and the interior surface of the top of the ICF wall. Ceiling gypsum board installed before wall gypsum board and sealed to ICF. Roof sheathing Ceiling insulation (blown cellulose, fiberglass or unfaced batts) Insulation wind baffle 2 in. minimum space Roof trusses tied down with metal straps Gypsum board ceiling Continuous soffit vent Inner fascia Polymer-based (PB) stucco installed directly on ICF wall or Portland cement plaster stucco over metal lath Gypsum board on ceiling extended over top of wood furring and sealed to interior of ICF wall Wood furring; held down from top of ICF wall to permit ceiling gypsum board extension Gypsum board with vapor semipermeable (latex) paint or direct applied plaster Sealant As a perfect barrier system, window and door detailing is important. Figures 6 and 7 illustrate details similar to historically successfully performing details developed for perfect barrier/mass storage masonry stucco systems. The " punched openings " need to be lined with a liquid applied fl ashing system to get rainwater out to the exterior face of the foam ICFs. Punched openings in all ICF assemblies regardless of cladding system need to be lined. Did I mention that the punched openings need to be lined with a liquid applied fl ashing? Here comes another issue: you can't inspect the concrete for voids the way we do with typical cast-inplace concrete because you don't strip away the forms. Some folks use ultrasonics to check for voids. Most folks measure the volume of concrete placed. Because the foam blocks are accurately sized and spaced formwork, comparing the predicted volume of concrete needed to the concrete actually placed can catch errors. Some small voids (hand sized for example) are still possible, but these have little to no structural effect. OK, relax, all is well. Now you need to focus on heating, cooling and ventilation because you are all part of the ASHRAE family. FIGURE 6 ICF Window-Stucco-Head. Windows installed before stucco. Note that punched openings in all ICF assemblies regardless of cladding system need to be lined with a liquid applied flashing. Alternative Detail Foam or stucco filler Backer rod and sealant Fluid applied flashing Notch or kerf Polymer-based (PB) stucco installed directly on ICF wall or Portland cement plaster stucco over metal lath 2 x 8 (width trimmed to size) treated wood buck Foam filler Backer rod and sealant (finish must be primed with sealant manufacturer's approved primer before sealant is installed) ICF wall Gypsum board with vapor semipermeable (latex) paint or direct applied plaster 4 in. min. galvanized screws placed before concrete 1 x 4 wood furring (optional) Gypsum board return 2 x 6 treated nailing flange (flush with interior face of ICF wall) Sealant Fluid applied flashing Backer rod and sealant Protruding metal or masonry sill Sealant 2 x 8 (width trimmed to size) treated wood buck Polymer-based (PB) stucco installed directly on ICF wall or Portland cement plaster stucco over metal lath 2 x 6 treated nailing flange (flush with interior face of ICF wall) Gypsum board with vapor semipermeable (latex) paint or direct applied plaster ICF wall S E PTEM B E R 2 0 2 4 ashrae.org ASHRAE JOURNAL 27 Protruding metal or masonry sill Sealant Fluid applied flashing See detail Foam or stucco filler Wood or marble ledge Sealant Fluid applied flashing 1 x 4 wood furring (optional) FIGURE 7 ICF Window-Stucco-Sill. Windows installed before stucco. Note that punched openings in all ICF assemblies regardless of cladding system need to be lined with a liquid applied flashing.http://www.ashrae.org