Residential New Construction (NC): Slab Insulation UES Measure Update

1. Residential New Construction (NC):Slab InsulationUES Measure Update Regional Technical Forum December 17, 2013

2. Residential NC Slab Insulation: Measure Overview • Current Category: Proven • Current Status: Under Review • Current Sunset Date: December 31, 2013 • Reason for Update/Review: Response to recommendation memo; sunset date • Baseline Type: Current Practice

3. Staff Highlighted Areas • None

4. Summary of Updates • Recommendation memo updates made • Updated workbook to use latest ProCosttemplate • Updated workbook to include complete SEEM model inputs and outputs for each scenario investigated • Clarified measure definition as only applicable to Montana and Heating Zone 3 • Recalculated savings using the updated and calibrated SEEM Version 0.94 • Updated baseline inputs to reflect the latest Montana Energy Code • Removed extraneous SEEM runs from workbook

5. Summary of Updates (continued) • Recommendation memo updates not made directly in measure workbook • Documentation of SEEM calibration • This documentation is captured separately on RTF website • Documentation of all new construction SEEM inputs • Staff has created a centralized workbook with New Construction baseline assumptions • Slab insulation measure workbook contains detailed documentation of SEEM inputs relevant to the measure

6. Current Montana Code for Slab Insulation • If foundation is slab-on-grade, and slab is less than 12 inches below grade: • Code requires R-10 slab insulation on perimeter • Insulation needs to extend 4 ft by any combination of vertical and horizontal placement (see next slide for illustration)1 • If slab is greater than 12 inches below grade (e.g. full basement), no slab insulation is required 1 Applies to slabs without in-floor heat. Heated slabs required R-15 slab insulation by MT code.

7. Current Montana Code for Slab Insulation (continued) Slab-On-Grade Code Options Combination horizontal and vertical case Vertical case Horizontal case

8. Current Montana Code for Slab Insulation (continued) Baseline and Efficient Cases Modeled

9. Summary of Changes • Savings decreased by 28 to 37% depending on HVAC type: • Zonal electric: 33% • Forced air furnace: 37% • Heat pump: 28% • No change in incremental costs other than adjustment from 2008$ to 2006$ • All measures remain cost-effective

10. Decision “I _______________ move that the RTF: • approve the Residential New Construction: Slab Insulation measure as a Proven UES; • Set the measure status to ‘Active;’ and • Set the sunset date to December 31, 2016.”