"Here's a very recent article on Green Building Advisor that reinforces the issues to…"
What is the R Value of a 2x6 dense packed cellulose wall?
I am reviewing the requirements of the new Maine Uniform Building and Energy Code that goes into effect 12/1/2010. The required R value for a wood framed wall is R20. If I assume the Dense Packed Cellulose has an R value of 3.4 per inch and a 2x6 is really only 5.5" deep, then 5.5" of cellulose is only R18.7 which doesn't quite meet the standard.
I could put in R21 fiberglass and meet the standard, but I am sure the cellulose would out perform the glass in the real world.
How does everyone else view this subject?
I could put in R21 fiberglass and meet the standard, but I am sure the cellulose would out perform the glass in the real world.
How does everyone else view this subject?
Views: 1119
Replies to This Discussion
-
Permalink Reply by Scott cragun on -
According to National Fiber's website a 2 x 6 wall at 5.5 " thick has an R value of R20 when dense packed at 3.5 lbs per cubic foot. The reason the Code has a minimum wall insulation requirement of R20 is because thats as good as it gets with celluloce, if the cellulose manufacturers hadn't been allowed their input the minimum would be R21 (fiberglass batts).
-
Permalink Reply by Al Maloney on
-
Thanks for the reply Scott. I found that on the National Fiber site after I posted the message.
What approach do you plan to take to get R49 in a cathedral ceiling where the slope area is greater than 500 ft2 or 20% of the total ceiling area?
Home Energy Pros
Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy, under the American Recovery and Reinvestment Act) and brought to you in partnership with Home Energy magazine.
Latest Activity
David Eakin commented on Elisa Wood's blog post Momentum builds for energy efficiency...but is the wolf at the door?
Egr renovation posted a status"of course he is in paris but works around europe
http://ning.it/16KrbS7"
Egr renovation posted a status"i just find a good photogrpahe for your master piece
http://www.armanimage.com"
Meagan Foster posted eventsHomes 401: Green Rater Training
August 15, 2013 to August 16, 2013BPI Building Analyst Field Training
September 9, 2013 to September 12, 2013BPI Building Analyst Field Training
July 15, 2013 to July 18, 2013
Meagan Foster updated an eventEnergyLogic's RaterFest! at Black Hawk, CO
September 13, 2013 at 10am to September 15, 2013 at 12pm
Join us for one of the best home energy conferences available! This retreat will provide…See More
Meagan Foster updated an eventHomes 401: Green Rater Training at Berthoud, CO
June 25, 2013 to June 26, 2013
This highly interactive workshop builds upon the material presented in the online course, further…See More
Meagan Foster updated an eventHERS Rater Training - Online at Online
July 1, 2013 to July 26, 2013
NEW - our great RESNET HERS Rater online training is now completely self-paced, so you can start at…See More
Meagan Foster updated an eventBPI Building Analyst Training - Online at Online
June 3, 2013 to June 28, 2013
Join the EnergyLogic Academy for our BPI BA online training - we just went to a completely open…See More
© 2013 Created by Lawrence Berkeley National Laboratory.
