Strategies for insulating on top of & around heat sources in attics (such as recessed light fixtures).

I have been going by the rules of the program admins in my region when it comes to how to treat heat sources in attics when preparing to insulate attics with blown-in insulation. The standard operating procedure is to "dam" around heat sources (mainly recessed light fixtures) using un-faced FG batt insulation. The damming must be at least a few inches higher than the installed depth of the blown-in insulation. The end result is that blown-in insulation does not end up covering the heat source and potentially cause a fire-related problem.

But, I have been pushing for the fabrication of "boxes" made of materials such as gypsum board or aluminum flashing so that insulation can be blown on top of & around the boxes. Any thoughts on this strategy, or other strategies you'd like to put on the table?

Thanks in advance.

Patrick

Views: 206

Reply to This

Replies to This Discussion

Hi Patrick, If you have looked at those dams with IR with the heat source on you know they are dumping heat like mad.  Exactly what you can do should be discussed with the local code official.  IMO, a proper covering that would allow a full insulation layer over it is needed.  Doing such without breaking the rules, the fire codes, and electrical codes is the trick and only the AHJ can answer that.  But don't apply the same solution to another district without talking to that official as each may have their own rules.  Personally, I advise they replace the fixture with a IC/AT rated, but the real world needs an easier fix.

Bud

Very good and proper advice. Looks like it's back to the conversation with the code officials.

One of your arguments to present to your code official is that lights can be installed in small enclosed drop ceilings, like a kitchen drop that was created after the drywall was installed.  I have not seen instructions stating that the area above has to be open to an attic and many are installed in joist cavities between floors.  Logic is on the side of the Gypsum box Bob is suggesting, just need the ok to use it.

Bud

This was my sense as well, so I appreciate you raising that example.

Gypsum board would be good to make the "box" out of. It's easy to work with and cheap. probably wouldn't be a bad idea to box in all of the attic electrical boxes/bathroom fans and use some foam sealer or drywall mud to seal them up.

RSS

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

Chris Dorsi posted an event
20 minutes ago
Joe Crisara commented on Chris Laumer-Giddens's blog post A Solution for Fresh and Make-Up Air Happiness
"Great video Matt! I will pass this along to all of my students"
1 hour ago
Casey Gesell posted events
1 hour ago
Joe Crisara posted events
1 hour ago
john bustos commented on john bustos's photo
Thumbnail

20160205_171430

"Found this, and much, much more on a recent attic inspection."
1 hour ago
john bustos posted a photo
1 hour ago
Diane Chojnowski commented on Seventhwave's event Better homes video series
"You're welcome to post your videos here on Home Energy Pros."
2 hours ago
Quinn Korzeniecki replied to Quinn Korzeniecki's discussion 3 Energy Saving New Year’s Resolutions to Make in 2016
"Hi Sam, I'm glad you enjoyed the tips! I am a renter myself, so I can only follow along with…"
2 hours ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service