Northwest Energy Code Compliance with Mass Wall Assemblies

Mass Wall Benefits Providing Effective Thermal Storage Dampening heating and cooling loads Shifting peak loads to off-peak hours

Code Compliance Paths Prescriptive Path Component Performance Systems Analysis • Prescriptive path tables contain maximum U-value (minimum R-value) requirements for all building envelope components. • Component performance allows trade-offs between individual component requirement while not exceeding the total energy use when complying prescriptively. • Washington allows trade-off calculations and ASHRAE ENVSTD software. Oregon STA (simplified trade-off approach) uses software developed by ODOE. • Systems analysis is used for more complex buildings. Analyzes lighting, HVAC equipment and building envelope components. Called “whole building” approach in Oregon. Updated 1.23.12

Washington State Energy Code Alternative Prescriptive Path Wall Requirements Wall Type Entire State CMU U = 0.104* * Partially grouted wall with integral insulation complies for certain building uses. • Heat capacity (HC) > 9 equates to a wall weight of 45 psf (any partial grouted 8” CMU wall). • Zone 1 includes portions of Eastern WA along with Western WA. OR Wall Type Entire State CMU R = 9.5 continuous insulation* * Partially grouted wall with integral insulation complies for certain building uses. Updated 1.23.12

R-11.4 continuous insulation Oregon Energy Code Alternative Prescriptive Path Wall Requirements Glazing area maximum = 30% Wall Type Max. U-Factor CMU U = 0.15* * Partially grouted wall with integral insulation complies for specific building uses. • Heat capacity (HC) > 9 equates to a wall weight of 45 psf (any partial grouted 8” CMU wall). • Zone 1 includes portions of Eastern WA along with Western WA. OR Wall Type R-Value CMU R-11.4 continuous insulation Updated 1.23.12

Code Compliance Integral insulated, partial-grouted concrete masonry walls can comply with northwest energy codes. • This wall complies prescriptively with the Northwest codes in most instances without interior insulation. (Up to 32” oc x 48” oc grouting, approx. 40% in Washington, and 50% grout in Oregon.)) Updated 1.23.12

Integral Insulation Methods

Integral Insulation Methods Injected Foam Insulation Continuous Non-Grouted Cells Patch Injection Ports W/ Mortar to Match Existing

Integral Insulation Methods

Mass Wall Insulation Options Z channel or other furring Loose fill or insulation inserts Stucco or other finish Insulation Gypsum Board Insulation INTERIOR INTEGRAL EXTERIOR

Mass Wall Insulation Options • Veneer/cavity walls can be constructed with flashing within the masonry wall. Updated 4.18.2011

Optimize Energy Performance Use comprehensive, whole-building energy analysis program with hour-by-hour simulation These programs can accurately model concrete masonry’s thermal mass and predict the associated energy savings Constant Inside Temperature Outside Cycle Time (hrs) 24 Heat Flow

Northwest Energy Code Compliance with Mass Wall Assemblies Integral insulated, partial-grouted masonry walls do comply with northwest energy codes. Architectural concrete masonry units can be exposed on both sides in many building designs providing attractive appearance, fire-resistance, and durable surfaces.

Northwest Energy Code Compliance with Mass Wall Assemblies CMU walls can meet Oregon & Washington prescriptive codes through compliance with average U-Factors OR the integral insulated mass wall exception. The use of continuous insulation is an additional option, not a requirement.