R-49 attic insulation is recommended for this climate, and I spec R-60 for most attic floors because cellulose is cheap.  Yet my own unconditioned attic has an effective R-value of only about 20.  There is a typically settled loose-fill cellulose job from the early 80s under the floorboards.  I decided to relocate the thermal boundary to the top of the loose tongue-and-groove attic floorboards and to the perimeter of the attic floor plane, creating in effect an inverted, insulated box over the living space. I added 2” of extruded polystyrene board and covered it with OSB.  There is no condensing surface inside my inverted box.

 

      I paid special attention to the exterior top plates and (perhaps most importantly) I personally attended to or oversaw every detail.  This led me back to the inescapable truth is that attention to workmanship is the key to building performance

 

 

Views: 106

Comment

You need to be a member of Home Energy Pros Forum to add comments!

Join Home Energy Pros Forum

Comment by Joseph J. Ilacqua on February 23, 2011 at 12:12pm
Geez, I wonder who insulated the walls on that house, Chris is taking credit for the attic, my memory isn't quite as sharp as it used to be, i can't remember

Latest Activity

Dannie Jackson liked Allison A. Bailes III's group HVAC
3 hours ago
Dannie Jackson added a discussion to the group Energy Efficient Design
3 hours ago
Dannie Jackson liked Barry NewDelman's discussion Help your Clients save, THEN do what you do best
4 hours ago
Dannie Jackson replied to Barry NewDelman's discussion Whats the Consensus of this group Define "Energy Efficiency" in the group Energy Efficient Design
"Design wise I would say that energy efficiency is defined by the Btu / square foot.  This is…"
4 hours ago
Dannie Jackson joined Chris Laumer-Giddens's group
Thumbnail

Energy Efficient Design

Energy efficiency starts at the drafting table...How architects and designers can help buildings…See More
4 hours ago
Dannie Jackson liked Chris Laumer-Giddens's group Energy Efficient Design
4 hours ago
Dannie Jackson posted a blog post
5 hours ago
Dannie Jackson liked Home Performance Coalition's blog post Building a Market for High-Performing Homes
6 hours ago

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service