A few months ago I had lunch with a friend of mine who recently bought
an older historic home in southern Ohio. The subject of insulation and
heating costs came up and we engaged in a bit of a debate over what kind
of insulation to use. Now, I don’t believe either of us won, primarily
because I don’t think an ultimately right answer exists for the topic
we were debating. The topic you ask? “How big of a role does the
R-Value really play in insulation on an application specific basis?” My
friend had bought enough R-30 fiberglass insulation for his attic
despite my attempts to encourage him to use a variety of materials, foam
and fiberglass included. Now, don’t get me wrong, fiberglass can serve
as an appropriate and effective insulation in a number of
circumstances. Fiberglass is good for walls, and can conditionally be
good for your attic as well. However, I view fiberglass insulation as
similar to a nice fleece shirt or pullover. They can certainly keep you
warm, but once the wind starts blowing, you feel it. In calm
conditions, fiberglass can work very well to keep heat in designated
areas, but does not excel as well as foam in preventing air movement,
and that air movement can contribute to a considerable amount of heat
loss. So what is the point of all this so far? Simple: Don’t assume
that just because your insulation has a high R-Value, that you’re going
to get the most effective results. My suggestion: If you want to use
fiberglass in your attic, that’s fine. However, be sure to go in and
use a good sprayed polyurethane foam around the exterior wall cavities,
fascia and soffit. Anyplace that air may be able to infiltrate from the
exterior (but remember that some ventilation is required). Once that
is complete, then you can add in any fiberglass that you’d like.
Remember, an R-Value is a measure of resistance to heat, not necessarily
a resistance to air movement. So the next time you’re looking to
insulate part or all of your home, just be sure to think carefully about
what you want to do, and keep an open mind about the different methods
available to reach that result.
Read more at our Hickory Energy Blog


Views: 7

Comment

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

Join Home Energy Pros

Comment by Mark Richardson on November 11, 2010 at 4:13pm
Great comments - I particularly like the "Fleece or Pullover" analogy. I'll be borrowing that one if you don't mind!

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

Jim Gunshinan posted blog posts
16 hours ago
H.O. Electric posted a photo

about us-team

H.O. Services is your residential Electric-Plumbing-Heating-Cooling Specialist. We are an…
17 hours ago
H.O. Electric added a discussion to the group News & Announcements
Thumbnail

Stay Cool With Easy To Install Ductless AC System!

Stay Cool With Easy To Install Ductless AC System!   Save $300.00 Off A New AC System For A Limited…See More
17 hours ago
Richard Wells commented on Diane Chojnowski's group Facebook Pages
"Three thousand home energy efficiency audits, and nearly a thousand retrofits in four short…"
18 hours ago
Richard Wells joined Diane Chojnowski's group
Thumbnail

Facebook Pages

Does your company or organization have a Facebook Page?This group is for pros who have facebook…See More
18 hours ago
David Baerg replied to Blake Shurtz's discussion Air sealing wood-burning fireplace from the crawlspace below
"Hi Blake, Do you mean around the underside of the hearth?  Are you trying to seal between the…"
19 hours ago
Tom White's video was featured

Rebirth Realty: Restoring Detroit properties for Venture for America Fellows

Its been a long, cold winter, but we've made significant progress in the restoration of 760 Virginia Park. Join Tim Dingman on a walkthrough to see what we've done.
20 hours ago
Kim Tanner added a discussion to the group Multifamily Buildings
Thumbnail

Blower Door Applications Guide

TEC and Camroden Associates have released their big building testing manual, Blower Door…See More
20 hours ago
Profile Iconmichael coleman, Dan Liska and Rob Moreno joined Home Energy Pros
21 hours ago
Christopher Morin's blog post was featured

5 Things New Energy Efficiency HVAC Contractors Need to Know

1. Do not sell on Price! Use 'Simple Payback'The price of High-efficient equipment will undoubtedly…See More
yesterday
Jim Gunshinan's blog post was featured
yesterday
Kim Tanner commented on Diane Chojnowski's group Home Energy Pros on Twitter
"Follow The Energy Conservatory on Twitter! We'll follow…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service