What sort of leakage reduction could I expect if I try to plug all these tiny gaps?

This is a typical cathedral ceiling around these parts, 2x6 tongue and groove over 4x beams. In this image we're looking at a big valley rafter running diagonally in front, with a beam in the background at right. There are a couple of can lights and a couple of skylights in there too. This is after about 30 minutes with the door running and a 20 degree delta T. All of the beams have strips of trim, about 3/8" x 1", nailed on with brads. Lots of air comes out from behind that trim, where boards end. Relatively little comes out in the field, apparently because there's poly sheeting behind the 2x6.

It would be possible to pull each piece of trim with a flat bar, pull the nails, caulk behind it, drill a hole into each joint, inject more caulk in hopes of sealing the tongue/groove, and renail the trim. Some of this stuff is 16 feet in the air above the grand piano, really hard to get at. 

Ever done a test-in, test-out on leakage like this? Did you get big results? This house is well around 2 CFM50 per square foot, so it needs a major reduction.

Views: 175

Attachments:

Reply to This

Replies to This Discussion

I have sealed this before. IMO, it would be easier to run two beads of caulk on each side of trim rather than removing the trim piece. Unfortunately I didn't individually test the measure when I did the job, so I am not sure how much that contributed.

Hi David,

I've worked above expensive furnishings and either everything has to be moved or protected.  Drop that flat bar and no one is going to be happy.  Thus, I might consider the back door approach.  Do everything else and what is left is some base amount plus that ceiling.  If you can isolate that room in any way, some zone pressure readings might help identify how much is coming from where.  Again, even if you can't read that space, maybe you can read others.  Divide and conquer.

Bud

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

Casey Gesell posted a video

How Dr. Energy Saver Helped Me Grow My Home Services Business | Dealer Testimonials

http://www.drenergysaverdealerships.com | 1-877-479-3637 Real Dr. Energy Saver dealers explain how the proven marketing, sales and training programs allowed ...
7 minutes ago
Casey Gesell commented on Tom White's video
Thumbnail

Ducts in an Attic

"Hi Tom, Thank you for sharing our Dr. Energy Saver video!"
37 minutes ago
Diane Chojnowski posted a discussion

EEBA 2014 Conference Presentations

EEBA has posted many of the presentations from their conference in St. Louis last week. Check them…See More
40 minutes ago
Profile IconJames Tucker, Dean Brewer and CPB Mechanical joined Home Energy Pros
1 hour ago
Tom White posted a video

Ducts in an Attic

http://www.drenergysaver.com | 1-888-225-6260 In episode 66 of the On the Job video series, Larry Janesky, owner and founder of Dr. Energy Saver, is back to ...
16 hours ago
Stacy Hunt posted events
20 hours ago
Rob Madden, Solar Home Broker posted blog posts
20 hours ago
Kerry Haglund posted a blog post

Efficient Windows Collaborative Releases Window Selection Tool Mobile App

The Efficient Windows Collaborative (EWC) has released a mobile app based on it web-based Window…See More
21 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service