This is a post-weatherization photo of how a contractor in a local low income weatherization program boxed a bathroom fan. That's the fan buried in cellulose with a piece of tin laying loose on top of it. The fan is in complete contact with the insulation which, in my opinion, could lead to a fire and there certainly is no air sealing going on. Seriously shameful.

Tags: attic, bad, boxing, fan, income, low, program, tin, weatherization, work

Views: 416

Attachments:

Replies to This Discussion

If it's just a bath fan, what's the fire risk? Do the manufacturer's instructions call for clearance to combustibles?

I'm with David in that question. Not sure it's a fire risk, but it is a leaky component adjacent to a high humidity source. Does not look air sealed.

Addressing this as you would a can light before adding cellulose is how I've addressed this (box, 2 part all seams)

I think some may simply seal penetrations and seams in the box, which might be acceptable and does not appear to have been done either.

Wonder what local requirements are or how others handle this.

Ted, I was taught to box with 5/8" fire-rated drywall with a 3" clearance from any heat source. Once the box is fit into place it is foamed around the base. I tape my seams inside and out with approved foil tape. Some of the programs feel drywall is a mold risk, so they require boxing in metal stove pipe with a cap.

That looks like a regular bath vent not one of those heat lamp / vent combos.

If you have a heat lamp combo in there that might be a good precaution (check with the manufacturer) but for the rest there is not enough heat generated to cause an issue.

The big issue are recessed lights where you have a regular or CFL bulb pushing out 200+ degree heat inside the fixture itself

I will use a combination of tape, caulk & even foam around the outside of it - I never really touch the inside as that can screw with the UL labeling & besides that they are nearly impossible to get them clean enough for anything to stick long term

I tape the joints in the box with foil tape before I install the fan, then go in the attic after the drywall is in and foam the fan/drywall joint after the duct is attached and taped. I don't know how worthwhile it is, since a lot of air leakage tends to be inside the duct, in either/both directions, but if I can seal something, I do it.

RSS

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

Tom White posted a video

The Future of Housing - And How Airtightness Can Help

http://www.houseplanninghelp.com/80 The search for a new home can be daunting; whether it’s your first purchase, you’re relocating, or your family is increas...
6 minutes ago
Corbett Lunsford's 2 videos were featured
34 minutes ago
Sean Lintow Sr posted a blog post

http://thehtrc.com/2015/illinois-the-eri-the-iecac-resnet-the-final-push

Monday April 6th (10 AM to noon) will decide whether the ERI aka as the HERS option will be part of…See More
1 hour ago
Tyler Grubbs posted an event

Join a Demonstration of the Oak Ridge National Lab Buildings Tech Crowdsourcing Community at Online

April 9, 2015 from 2:30pm to 3:30pm
Oak Ridge National Laboratory will host a live webinar-"Getting the Most Benefit from Participating…See More
3 hours ago
randy tolowski replied to randy tolowski's discussion Another unvented roof question
"you are correct. we won't know how these new products perform long term. I hope I get the ok…"
Saturday
randy tolowski replied to randy tolowski's discussion Another unvented roof question
"good info Sean thanks for the heads-up on calling it a sip. code approved hot roof system sounds…"
Saturday
Bud Poll replied to randy tolowski's discussion Another unvented roof question
"I've removed caulking that was over 30 years old and it outlasted the materials to which it…"
Friday
Profile IconAmanda Hallock, Kalvis, Tyler Grubbs and 6 more joined Home Energy Pros
Friday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service