Jefferson City Deep Energy Retrofit

Jefferson City, MO

Aug 1 2011 By Peter Yost | 0 comments

General Specs and Team

Location: Jefferson City, MO
Bedrooms: 3
Bathrooms: 1.5
Living Space : 1600 sqf
Cost (USD/sq. ft.): $55/sqf

Cost based on final appraised value.

Project Team
- Builder: River City Habitat for Humanity
- Sustainable Building Consultant: Verdatek Solutions
- Rater: ASERusa

Community Organizations
- City of Jefferson
- HBA of Central Missouri
- Linn State Technical College
- Missouri Small Business & Technology Development Centers
- Missouri Career Center
- University of Missouri Extension
- Nichols Career Center
- Central Missouri Community Action
- Missouri Department of Natural Resources
- University of Missouri-Center for Sustainable Energy
- Central Missouri Region Master Gardeners

National Support
- NAHB Research Center National Green Building Program
- DOE Building America

Construction

Foundation: block wall crawl space modified with partial full basement
Above-grade walls: structural block modified with interior insulated framed wall
Roof: vented unconditioned attic modified to “cathedralized” conditioned attic

Energy

Foundation: insulated and air-sealed with R-8 Icynene
Above-grade walls: R-19 "flash and fill" (2x4 inset walls sprayed with 2 in. of foam and filled with cellulose)
Roof: R-40 cathedralized and sprayed with Icynene
Windows: Quaker AdvantEdge (U-factor=0.30; SHGC=0.29; VT=0.50)

Indoor Air Quality

AprilAire Model 8126 Ventilation Control System

Certification

NGBS score and rating pending

This Habitat for Humanity (HFH) GreenBuild community project moves a 100-year old home to a “200-year” home

At face value, 802 West McCarty is nothing special, just one of 800 vacant or foreclosed homes in a distressed Jefferson City, MO urban neighborhood. But you don’t end up with the team listed to the right without creating something special indeed: the deepest green Habitat for Humanity (HFH) remodeling project in the Midwest. “We took it from the past 100 years and will be able to give it another 100 years of life,” says Ken Thoenen of Ken Thoenen Homes, the project chairman.

Humble home, humble owners
802 McCarty was built in 1913 just a couple of blocks from downtown Jefferson City . “A home located for walking,” says Matt Belcher, the sustainable building consultant on the project team. And that is just what the home’s first owners did:

- A. P. Nixdorf, prison guard (1913)
- Eugene Pitroff, printer (1915)
- Lon Stone, brickman (1925)
- Frank Burns, bookkeeper at State Treasury Office (1929)
- Harold Angerer 1930’s – 1956
- Kenny Angerer 1956 - ?

The new owners, Courtney and Kevin Pigford, both work at Lincoln University in Jefferson City, which is about ¼ mile away.

Getting everyone involved, yet staying integrated
While having a lot of project support and participation is terrific, you won’t end up with a high-performance retrofit without keeping everyone on the same page. Students from Linn State Technical College completed the redesign of 802 McCarty, and demolition and construction were accomplished by carpenters-in-training from the local school district and more than 50 HFH volunteers.

“We used the NAHBGreen online checklist as our guiding document,” said Belcher. “We identified criteria we would undertake and then broke down applicable sections with specific leading team members.”

Belcher adds that from the very beginning the project team had these redesign goals to drive the process as well:

- Keep same footprint, but increase livable square footage by a third by going up (lower main floor ceiling to 8 feet, creating an additional bedroom, half-bath, and storage in the attic).
- Tighten up the building envelope (Matt: “We got an initial reading of about 8,500 cfm50. We were unable to get the house to depressurize to -50Pa, so our equipment estimated the cfm50 reading at 8,500. It isn't an exact science by any means, but 8,500 does describe a really leaky house at such a small size.”)
- Create needed space and manage moisture by going down (dig out a 12’ by 12’ by 5’ section of the crawlspace into a basement for a central stairwell).
- Bring in the sun (remove the existing laundry room; relocate the kitchen and a bedroom to the rear of the home).
- Make the home durable with good indoor air quality (insulate the roofline and walls with spray foam, bring all ducts and HVAC equipment inside by locating these elements in the attic).
- Improve the site (manage storm water on site, improve grading, and establish mature native vegetation).

While they were at it…
The house at 802 W McCarty ended up being certified for both the NGBS rating program as well as the DOE Building America Builder’s Challenge. Here is Matt Belcher again: “The NAHBGreen checklist also has the benchmarks and checklist for the Building America/Builder’s Challenge program. As we were completing the checklist, we realized we were also hitting those benchmarks. We worked with Amber Wood, Energy Manager at NAHB Research Center for the dual certification within the scoring tool. And then throw in on top of that Energy Star certification — not too shabby.”

There is nothing more local than next door
For years, the lack of proper grading on the site directed water right to the house. At an early planning meeting, Matt heard that Jefferson City would be taking down the condemned house next door. He knew that all the homes in this area had cut limestone blocks for foundations. Turns out that no one had “claimed” these blocks, and the demolition contractor was more than happy to simply push them on to the 802 W McCarty property rather than haul them away. A retaining wall made of the neighbors’ foundation blocks now manages water, directing it away from the home.

True “sweat equity”
Not only did this project have half a hundred dedicated volunteers, it had a core group of students from the nearby Nichols Career Center who did most of the carpentry, drywall, siding, and trim. But the real proof of their mettle was digging and carrying out, bucket by five-gallon bucket, all of the soil to turn a major portion of the foundation from crawlspace to full basement. No more lazy comments about today’s youth, at least not in Jefferson City!

Lessons Learned

Matt Belcher took some time to think through this aspect of the project.

Hidden challenges: “Whenever you are dealing with renovating a home there are always the unforeseen challenges. In a building of this age, we encountered a number of issues that were not necessarily issues from the original construction. In fact, the quality and durability of the original structure is what made it possible to rehab this home instead of demolish it. During the course of the project, I always thought about the original builder and stone masons that laid up the stone and brick walls. They certainly did not have the equipment we do now, but they did a fine job building a good ‘stout’ home. I would hope in a hundred years or so someone would think that way about what I did!”

Correcting the work of others: “Most of our hurdles were with the additions that were put on the home with dissimilar materials and some of the products (like asbestos floor tiles and duct insulation) that were added long after the original home was built. The biggest challenge was the damage done simply by having stormwater running directly against the rear and sides of the home.”

Solar-ready: “We originally had wanted to include a solar thermal system and possibly some other ‘high tech’ equipment, but Habitat was concerned with the new homeowners’ ability to manage and maintain these higher tech items, not mention the price point. We concurred with their concern and included the ability to have these types of items added with the hopes that over the course of time, they would be.”

Taking the time to build a team: “We held several pre-planning meetings to have everyone on our team onboard, especially the folks from Nichols Career Center and Students at Linn Tech. I was able to visit Linn Tech and hold a couple of workshops with the architectural students there to discuss the nature of green building and how we are applying it to this project and identify how the National Green Building Standard and checklist was being used. They made several site visits, of course, to do measuring and inspections to be able to develop the plans for the house.

One great example of our partners’ benefitting from the process was during the blower-door testing we did prior to drywall. The insulation contractor was just completing the window and door sealing as we cranked up the blower door. Our rater also had an infrared camera with a digital thermometer. He was able to use the ‘gun’ to show areas around the windows that needed to be sealed. It was a great learning tool for the insulator; he is now interested in acquiring one of these ‘guns’ for their company’s own quality control process.”

Moving the building industry forward: “We were also able to demonstrate to industry professionals the process of focusing on the building envelope and designing in daylighting and passive solar as we rehabbed this project. We also demonstrated how a high-performance envelope can mean properly sized equipment much smaller than original, even thought the home was larger.

Finally, we held several open houses, a few for industry professionals and a few for the general public (with a focus on homeowners in this neighborhood to demonstrate what could be done with homes of this era!). These were all well attended. We had fact sheets posted around the home explaining different features and upgrades and general information. Our team even came up with a trivia game based on features in the home that visitors could get answered by reading the fact sheets!”


Peterbilt

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Image Credits:

  1. Matt Belcher
  2. HBA of Central Missouri
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