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: 238

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

Latest Activity

Chris Dorsi posted an event
Thumbnail

2018 Habitat X Summer National Conference at Big Sky Montana

June 27, 2016 to June 29, 2016
The 2018 Habitat…See More
9 hours ago
Stuart Langley liked David Byrnes's blog post Strategies for Hiring and Interviewing for Home Performance Professionals
13 hours ago
Kevin Miller replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"Visual inspection can only confirm the presence of mold, not the absence.   That said,…"
16 hours ago
Armand C Magnelli replied to Don Fugler's discussion joining ducts in the group HVAC
"I often suggest pop-rivets as an alternative to sheet metal screws for both clothes dryer duct work…"
17 hours ago
Kevin Miller replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"Sampling would be primarily to verify 'Condition 1' or 'Normal Fungal Ecology'…"
17 hours ago
Daniel Cullen joined Building Performance Institute's group
Thumbnail

Building Performance Institute (BPI)

BPI is the nation's premier standards development, quality assurance and credentialing organization…See More
17 hours ago
Daniel Cullen replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"Can anyone tell me exactly HOW mold sampling impacts the mold remediation process or protocol? Why…"
17 hours ago
Daniel Cullen joined Bob Krell's group
Thumbnail

Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon,…See More
17 hours ago

Photos

  • Add Photos
  • View All

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

Badges  |  Report an Issue  |  Terms of Service