Goal: To design and build personal housing that is financially sustainable, energy efficient, beautiful and durable<br />
Overview <br /><ul><li>Financially sustainable home residence. Rental income on main home will cover mortgage. ADU would g...
Northwest Energy Star certified through Earth Advantage Institute with a projected EPS score of 40 (Oregon EPS avg is 89)....
Notable home design features:
staggered stud wall construction, slab-on-grade, concrete floors,
natural gas powered tankless water heater (92% efficient) for hydronic heating and potable water
heat recovery ventilator (Fantech 1405R)
 passive solar orientation (U 0.30 windows)
 reused finished materials (doors, tub, sinks, etc)
space efficient design, lofts, exposed beams, and accent lighting.</li></li></ul><li>799 sq ft. , 2.5 stories. 1 BR, 1 BA,...
Sketchup Model<br />As Built (current status) <br />
Selecting a House with an Appropriate ADU Site<br /><ul><li>Neighborhood Livability: 71 Walkscore.com
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Building an Accessory Dwelling Unit In Portland

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Building an Accessory Dwelling Unit In Portland

  1. 1. Goal: To design and build personal housing that is financially sustainable, energy efficient, beautiful and durable<br />
  2. 2. Overview <br /><ul><li>Financially sustainable home residence. Rental income on main home will cover mortgage. ADU would generate a $1K/month in rental income (if I were not living in it); the $100K investment roughly translates to an 8.3 year investment payback period.
  3. 3. Northwest Energy Star certified through Earth Advantage Institute with a projected EPS score of 40 (Oregon EPS avg is 89). This model assumes 6. 5 ACH @ 50 pascals; aiming for 1.5 ACH @ 50 pascals.
  4. 4. Notable home design features:
  5. 5. staggered stud wall construction, slab-on-grade, concrete floors,
  6. 6. natural gas powered tankless water heater (92% efficient) for hydronic heating and potable water
  7. 7. heat recovery ventilator (Fantech 1405R)
  8. 8. passive solar orientation (U 0.30 windows)
  9. 9. reused finished materials (doors, tub, sinks, etc)
  10. 10. space efficient design, lofts, exposed beams, and accent lighting.</li></li></ul><li>799 sq ft. , 2.5 stories. 1 BR, 1 BA, office. <br />
  11. 11. Sketchup Model<br />As Built (current status) <br />
  12. 12. Selecting a House with an Appropriate ADU Site<br /><ul><li>Neighborhood Livability: 71 Walkscore.com
  13. 13. Micro-Neighborhood: grouped yards, funky architectural zone,
  14. 14. Property/Site Selection: house cash flows, canopy to south</li></li></ul><li>Current projected cost for the new construction is $115/sq ft.<br />Time<br />Design 2 months<br />Permitting 1.5 months <br />Building 4 months (projected) <br />
  15. 15. Building Envelope Features<br />Wall Assembly (from exterior to interior)<br /><ul><li>Cedar siding shingles- a naturally water repellant composition.
  16. 16. Rain screen from strips of dimple board,
  17. 17. Weather Protective Barrier- Siga Majvest weather protective wrap and Siga Wigluv tape for the plywood sheathing joints.
  18. 18. Staggered stud framing. 8 ¾” insulation cavity ; little thermal bridging.
  19. 19. Loose fill blown in fiberglass in cavity- R33 </li></ul>Roof, Slab, and Glazing<br /><ul><li>The roof assembly will be R44
  20. 20. Slab on grade floor will be R-15 (using 3” XPS foam) and is thermally broken from the foundation walls (using 1” EPS foam)
  21. 21. The windows and French door are vinyl, with a U-value of 0.30</li></li></ul><li>Standard wall assembly detail and insulation and air sealing bid<br />
  22. 22. RemRate analysis by Earth Advantage<br />Projected 39.6 MMBtu Translates to an EPS score of 40. Oregon EPS score average for new homes is 89. <br />
  23. 23. Materials<br />Materials<br />Surprised by the high cost of salvage materials. Often, it wasn’t any cheaper to use salvage. Will use salvage for finish materials: <br /><ul><li>Cabinets
  24. 24. Flooring
  25. 25. Railings
  26. 26. Sink
  27. 27. Tub
  28. 28. Doors, etc.</li></ul>Indoor Air Quality<br /><ul><li>Only duct work is short runs for HRV. Pressure and moisture balancing
  29. 29. Open, lofted floor plan will leverage the stack effect and winds to passively ventilate and cool the ADU - operable windows on East and West sides of the structure.
  30. 30. All of the floor and wall surfaces in the house will be hard; concrete and hardwood.
  31. 31. We’re using a high-quality weather resistant barrier in additional to cedar shingles; don’t anticipate moldy conditions in the walls. </li></li></ul><li>Quality Control<br /><ul><li>3rd party certification- Since it’s my primary residence and it’s not for resale, I wasn’t as concerned about certifications for resale.
  32. 32. Energy Star certification through Earth Advantage pays for itself and offers quality assurance.
  33. 33. Technical drop-in visits from the Energy Trust subcontractor outreach specialist. Earth Advantage will be conducting a blower-door test to check the air pressure and to help identify any sealing gaps.
  34. 34. Builder’s contract specifies using Energy Star’s ‘Thermal Bypass Checklist’</li></ul>Learning Curve and Professional Application<br /><ul><li>Document the design build process with a strong focus on ADUs
  35. 35. Observe and execute this first new construction project rather than try to learn and execute the trades myself
  36. 36. Help other individuals and communities who are seeking to build ADUs.</li></li></ul><li>Follow the blog: http://pdxadu.blogspot.com/<br />
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