While the energy codes state that continuous insulation may be located outward, inward, or integral, most projects place it outward with mixed results. This program describes the innovative “Back-Lattice Wall Design System”, which places the continuous and total insulation of closed-cell spray foam INWARD of the air barrier protected sheathing where it can stay dry, while remaining OUTWARD of the structural stud framing on thermally broken horizontal back-furring. This hybrid approach results in a proven high-performance wall system with bi-directional vapor control, two-hour load-bearing fire resistance, and net-zero energy compliance, while avoiding condensation risks.

Learning Objectives:

1. Define how the Back-Lattice Wall Design System complies with the code’s requirements for Continuous Insulation, Thermal Breaks, NFPA 285, Fire Ratings and Thermal Protection.
2. Examine the seven primary components of the Back-Lattice Wall Design System: Protected Sheathing, Horizontal Sub-girt Framing, Thermal Isolators, Stud Framing, Closed Cell Back-Spray, Interior Mold-Resistant Drywall, and Mineral Wool supplement.
3.  Differentiate how the hybrid use of closed-cell spray foam together with mineral wool insulations can benefit the total wall assembly for thermal, moisture, and fire.
4.  Illustrate by using WUFI Hygrothermic and 3D Thermal Modeling the performance characteristics in multi-climate zones 1 thru 8 and the importance of its vapor permeable10 perm air and water-resistant barrier (AWB-VP).

George David Schoenhard, AIA, BECxA, RRO, CSI, LEED AP, CIT, OSHA                       

George David Schoenhard, AIA has over 45 years’ experience in designing fine architecture, with the last nine as the Principal of DSS-Philly, one of the leading High-Performance Building Enclosure consulting firms in the Philadelphia region. He brings his decades of architectural experience to skillfully advise and design, implement or remediate building enclosures on behalf of other architects, owners and contractors.  He is the inventor and developer of the high-performance Back-Lattice Wall Design.  He actively researches comparative building enclosure assemblies, speaks nationally, and is an AIA Continuing Education Provider.