) for high-performing homes u u u u Polystyrene board Fiberglas batts New energy code/no interior vapor barrier required? Foam fill around windows u Inexpensive caulk & air-tight framing u WRB, tape and sealing the entire envelope u All sealed ducting u Triple-glazed window costs
25 Polystyrene + Fiberglass
26 Improve basics & modified techniques before high-tech solutions u Details, details, details. The Devil is in there! u Focus on the details to achieve maximum performance of materials through best practices u OVE framing practices u Two-stud corners, ladder pocket, alignment of components u Pre-poly and poly connection to WRB u Complexity and cost of generating power lower use first. u PV is a rapidly changing industry and current equipment will continue to drop in cost and go up in efficiency (a changing variable)
27 Ducts/plumbing in unconditioned space
28 ENERGY STAR for Homes process & checklists u Checklists: u Thermal Enclosure System Rater Checklist u HVAC System Quality Installation Contractor Checklist u HVAC System Quality Installation Rater Checklist u Water Management System Builder Cheklist u Hiring a qualified HVAC contractor u Must
29 Checklists u Thermal Enclosure u HVAC Contractor u HVAC Rater u Water Management
30 Performance measures in diagnostic testing u Energy rater three stages of evaluation u Site Visit 1 (SV1) Completion of framing u SV2 after HVAC, Plumbing, Electrical & insulation & poly VB u Blower door and duct leakage testing numbers SV3 u Duct leakage testing a t SV2
31 Site Visit
32 Site Visit
33 Site Visit
34 Duct Leakage Test Missed it! Main Level SF Lower Level SF Total SF = 1, ,880.8 SF / 100 = x 8 CFM25 = Your allowable total duct leakage is Your test results were this does not meet the requirements.
35 HVAC System u NO un-ducted cavity returns u Seal ALL seams u Seal cabinet u Seal boots to subfloor/wall/ceiling u Credentialed through ACCA OR Advanced Energy
36 Performance Measures & Testing u Blower door: 4 ACH50 u Air induced pressure of -50 Pascals u Meant to simulate a stiff wind perhaps mph u Ducts total: 8 CFM / 100 SF finished u Total of all ductwork u Ducts outside: 4 CFM / 100 SF finished u Total leakage in ductwork in unconditioned space u Just Right & Airtight, Joe Lstiburek BuildingScience.com
37 OVE Framing Practices
38 Advanced Framing: An Examination of its Practical Use in Residential Construction Based on the case study, some OVE techniques were practical to implement (when visibly marked on the construction plans) and had noticeable material savings, thermal benefits, and positively affected the quality of framing. Other practices were found to be problematic, either from a technical or logistical standpoint, or had minimal energy or lumber saving benefits (considering that exterior foam sheathing was employed on the home). On a first-time home, these added soft costs associated with the implementation of even the most basic OVE practices are likely to offset any savings accrued from reduced lumber use. Furthermore, the energy efficiency gains associated with using continuous exterior insulating sheathing overshadow the efficiency gains from employing OVE framing techniques.
39 Reducing backing requirements
40 Assess energy use in completed homes u u u Energy rater Blower door test and understanding the results Duct leakage test and understanding the results and why it s important
49 Special thanks to Molly Berg, Sustainable Building Program Manager at Habitat for Humanity of Minnesota Contributions: Cost analysis, assistance with Energy Rating, filling out the forms, etc. Molly Berg
50 In accordance with the Department of Labor and Industry s statute , Subd. 11, This educational offering is recognized by the Minnesota Department of Labor and Industry as satisfying 1.5 hours of credit toward Building Officials and Residential Contractors continuing education requirements. For additional continuing education approvals, please see your credit tracking card.
51 Links: OVE: Building Science: Construction Instruction:
52 Time-permitting: Exterior foam board/ new en