 systems. u By building a tight envelope and controlling mechanical pressures, we can reduce moisture flow through a building.
11 Preventing heat, moisture & air flow through the building envelope u Start with air-tight framing u Testing at insulation stage (we found biggest leaks due to framing) u WRB barrier, taped top, bottom, edges u Stopping wind pressure from producing air infiltration u Interior barrier methods u Poly/air-tight drywall, smart vapor retarders (vapor retarders whose vapor permeability changes based on the humidity conditions) u Connecting the interior and exterior barriers u Sealed to framing for complete air block u Under slab control of moisture & radon u Poly film, polystyrene board
12 Start with air-tight framing Caulking the framing Caulking the framing
13 Rim joist areas These areas need sealing
14 Sealing the gaps Penetrations such as electrical boxes Bottom plate Foundation to wood connections
16 Follow up after sheetrock installation, attic & walls, etc.
17 Preventing heat & moisture flow through the foundation system u u u u u u u Build foundation like a boat hull underwater Capillary break between footing & foundation wall (radon control) Connecting the capillary break to under slab radon control Insulating under the slab (new energy code) Use of ICF Capping the foundation top with waterproof membrane Connection between foundation and framing
18 Under Slab Poly & Foam Board Poly from under ICF wall Sealing around plumbing
19 Connection between foundation wall & framing
20 Connection between foundation wall & framing WRB sealed behind foundation protection
21 Basics at design stage of house u Planning for minimal ductwork u Keeping ducts inside the thermal envelope u Pass-through instead of ducted returns when possible to minimize ducts u Simplified design of home u OVE framing u Line up floor trusses, wall studs, roof trusses (24: o.c.) u Reduce thermal transfer
22 Central Returns w/pass throughs
23 Pass-throughs, returns
24 Material options (insulation, windows, mechanicals, etc.) 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 simulat