This 6,000 sq. ft. home was built in 1983 as an all-electric home. Fast forward 27 years later after the house was converted to gas heat and a new properly installed roof in 2010. Those are 2 x 10 rafters with an average of 2 to 4 inches of fiberglass insulation between them and no soffit baffles. 

 

We went from maybe R-11 to R-60 and the customer will get 100% ROI in less a year. 

 

Out of sight ... Out of mind ... Out of pocket $$$$$$$$ 

Views: 104

Attachments:

Replies to This Discussion

Jim,

What was the incident that caused this problem to be looked at? Ice Dam previous years? Damage from Ice Dam to roof, thus the new roof in 2010? Energy Audit? HO noticed insulation deficit?

John Nicholas
John,

This is actually my neighbor's house that she bought in 2009. The previous owners did no maintenance on the exterior of the home for the last 15 years. The new owner and her son asked me to be their GC and give them a job list for the exterior work that needed to be done. My number one priority was to stop all possible water leaks into the shell of the home. The home still had the original 1983 roof with missing shingles and several of the 13 skylights were leaking. We had the original roof torn off, installed new flashing and ice guard in the valleys and all edges before the new shingles were put on. Five months later our area experienced the worst ice dams in 20 years and the neighbor calls to tell me the her new roof is leaking. I explained to her the leaking was probably due to heat loss through the roof that was melting the snow pack on the roof and letting the water under the snow pack run down to the cold edges where it was re-freezing. I then went into the attic for the first time and confirmed the lack of insulation and improper ventilation. Ice dams are usually not caused by roof issues but quickly turn into roof issues.

I had another customer that was also having ice dams issues with his home built in 2005 and we determined it was due to the gas furnace in his attic generating enough heat to melt the roof snow pack which is something very few builders think about before they place the furnace in an unconditioned attic space.
Jim,

Thanks! I was curious about how the problem was identified. I have not had one on my home or observed one during an audit. I have experienced them in a commercial setting. The building had 4 foot eves, and a indirectly conditioned attic, DT the water charged fire sprinkler system. The valley's were a mess, about 8 feet above the inside eve line. The ridge would be 21 feet horizontal from there.

RSS

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Tom White's video was featured

Robby Schwarz on Builder Collaboration

Hear Robby Schwarz, of EnergyLogic discuss the value Owens Corning brings to Thrive Home Builders.
2 hours ago
Profile IconLights N More, John Kamas and Chuck Santeler joined Home Energy Pros
3 hours ago
Crosbey Archery liked Don Hynek's discussion Testing "Magic Pak" units??
4 hours ago
Crosbey Archery joined Norm Bourassa's group
Thumbnail

Multifamily Buildings

For too long there has been relatively little EE focus on multifamily, but some new programs have…See More
4 hours ago
Crosbey Archery liked Crosbey Archery's blog post Energy Tips - Fresh Look at Heating and Cooling the Home
4 hours ago
tedkidd liked Luis Hernandez's discussion Airsealing an old basement ceiling
11 hours ago
Ryan T De La Rosa posted a blog post

The Clean Power Plan and What You Can Do

Last month, Jessica Hardcastle at Environment Leader described an especially non-polarizing…See More
13 hours ago
Ed Minch replied to Luis Hernandez's discussion Airsealing an old basement ceiling
"Luis Think of it as a part of the house that is not being used, but part of the house none the…"
17 hours ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service