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 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.
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.
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 />
Building Envelope Features<br />Wall Assembly (from exterior to interior)<br /><ul><li>Cedar siding shingles- a naturally water repellant composition.
Doors, etc.</li></ul>Indoor Air Quality<br /><ul><li>Only duct work is short runs for HRV. Pressure and moisture balancing
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.
All of the floor and wall surfaces in the house will be hard; concrete and hardwood.
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.
Energy Star certification through Earth Advantage pays for itself and offers quality assurance.
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.
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
Observe and execute this first new construction project rather than try to learn and execute the trades myself
Help other individuals and communities who are seeking to build ADUs.</li></li></ul><li>Follow the blog: http://pdxadu.blogspot.com/<br />