Low-Impact Remodeling Mike O Brien, OSD Green Building Specialist Building envelope Solar heating & cooling Space heating Water heating Ventilation Moisture control Combustion safety Performance testing
Insulation is: Building Envelope Continuous no thermal breaks Full-R not compressed Higher R--not code minimum Air barriers tested to meet air leakage standards Windows Select by: U, SHGC, VT Doors Insulated core
Insulation Options Fiberglass batts Recycled denim batts Spray-in foam --Low density --High density Spray-in cellulose Spray-in fiberglass Integrated systems (SIPs, ICFs)
R-values Envelope assembly Attic ceiling Cathedral ceiling Walls Floors Basement walls 1992 Oregon Energy Code R-38 R-30 R-21 R-30 R-11 Optimum R-42/49 R-33/38 R-25 R-30 R-19
Spray-in foam Fiberglass batts
Which side is insulated with batts? Spray-in foam? Portland Office of Sustainable Development
Foam + batts Portland Office of Sustainable Development
Wet-spray cellulose Recycled denim fiber
Wet-spray cellulose Portland Office of Sustainable Development
Spray-in fiberglass
Integrated Structures SIPs Rastra Durisol and Faswall ICFs Other panel systems Durisol Portland Office of Sustainable Development Rastra
Structural Insulated Panels
CONTINUITY: Insulating hard-to-reach spots
Windows U-value = 1 / R-value Oregon Energy Code: U = 0.40 or lower (R-2.5) Optimum: U = 0.33 or lower (R-3)
Replacement sash Portland Office of Sustainable Development
U-value = Rate of heat transfer SHGC = Solar Heat Gain Coefficient Reflect incoming solar heat VT = Visible Transmittance
Air barriers Blower door test Envelope tightness Cost-effective air sealing Combustion safety Duct blaster Carbon monoxide test
Blower door Portland Office of Sustainable Development
Finding and sealing air leaks Smoke pencil
Duct blaster
Continuous air barrier ADA Airtight Drywall Approach www.buildingscience.com/resources/walls/air_barriers.pdf Portland Office of Sustainable Development
Space heating options Forced air systems Replace furnace Look for AFUE of 90% + Variable-speed blower motor Seal ductwork Insulate ductwork Programmable thermostat
High-efficiency sealed-combustion furnaces Efficient blower motor Tight ducts
Home Comfort Zones forced-air zoning system Portland Office of Sustainable Development
Space heating options Hydronic systems High-efficiency boiler PEX plumbing Radiant heating Radiators Fan-forced wall units
Green Remodeling Radiant hydronic heating Radiant hydronic heating
Water heaters Standard efficiency gas: 55% Good efficiency gas: 60% High efficiency gas: 80% + Sealed combustion--safe! Tankless gas: 80% + Electric: 93% Heat pump: 200% +
Tankless Water Heaters
Water Heater --120F --Wrap hot and cold lines --Wrap tank --Set tank on insulation --Showerheads 1.5 GPM --Faucet aerators 1.5 GPM
Solar water heating and photovoltaic systems Portland Office of Sustainable Development
Solar Water Heating
Fresh air ventilation Meets ASHRAE Standard 62.2 Whole house and spot ventilation Durable equipment Intelligent controls
Exhaust fans Quiet < 1 sone Durable 70 100 CFM Timer control
Timer controls
Make-up air for exhaust ventilation
Fresh air inlet Located in closet on outside wall
Remote exhaust fan
Solar tubes
Before and after daylighting
Contact G/Rated Mike O Brien 503-823-5494 mobrien @ ci.portland.or.us www. portlandonline. com/osd ReThink class series March 1 Download Green Remodeling Guide
Oregon Energy Trust 139,171 Compact fluorescent bulbs 20,744 15,526 4,002 491 95 70 2005 incentive payments Home improvement projects Clothes washers Home energy audits Energy Star new homes Solar water heaters Solar electric systems
2005-6 Residential Tax Credits Furnaces Heat pumps Appliances Clackamas 1,360 Multnomah 2,953 Washington 1,783 Clackamas 87 Multnomah 73 Washington 149 Clackamas 8,855 Multnomah 12,291 Washington 12,050