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: 55

Comment

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

Join Home Energy Pros

Comment by Joseph J. Ilacqua on February 23, 2011 at 9:12am
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

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Hal Skinner added a discussion to the group Radiant Control Coatings
Thumbnail

Rooftop A/C units and exposed ductwork

Lets start a discussion about rooftop A/C units and exposed ductwork. The worst place to put a…See More
15 minutes ago
Richard Beyer posted discussions
32 minutes ago
Brandon Walton replied to Brandon Walton's discussion EFAZ and APS Hosting Huge Welcome Party!!
46 minutes ago
Brandon Walton shared their discussion on Facebook
46 minutes ago
Brandon Walton posted a discussion

EFAZ and APS Hosting Huge Welcome Party!!

If your in Arizona on August 20th, stop on by and check it out!APS Home Performance Program Q&A…See More
47 minutes ago
Brandon Walton posted an event

Efficiency First AZ is Hosting Huge Meeting August 20th! at Rennick's Restaurant in the Hilton Phoenix Airport Hotel

August 20, 2014 from 5:30pm to 7pm
APS Home Performance Program Q&A w/new leader Maggie Gibbs!Join Efficiency First Arizona (EFAZ)…See More
52 minutes ago
Dennis Heidner replied to Jamie Kaye's discussion Flickering LED lights
""CFLs produce light by using electricity to instigate a chemical recation between mercury…"
1 hour ago
Richard Beyer joined Michael Stuart's group
Thumbnail

INFRARED THERMOGRAPHY USERS

This group is dedicated to knowledge sharing and discussion of infrared thermography for building…See More
2 hours ago
Profile IconRichard Beyer and Diane Chojnowski joined Hal Skinner's group
Thumbnail

Radiant Control Coatings

A group where people who work with radiant barrier coatings can let others know all of their uses.See More
2 hours ago
Profile IconTomás León, Tauran Ivall, Alex Burnham and 1 more joined Home Energy Pros
2 hours ago
Home Energy Magazine posted a discussion

Let's Talk Gender

It’s no secret that home performance is a male-dominated industry. Attend any industry conference…See More
5 hours ago
Mark Rogers added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Retrotec Blower Door Kit $1800

Retrotec Blower Door Kit complete with:DM2 Mark II digital manometer & automated fan…See More
5 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service