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: 194

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

Forum Discussions

Investigating 3257KWH monthly usage issue.

Started by Brent Shapiro in General Forum. Last reply by Joe Konopacki 20 hours ago. 7 Replies

Earn 2 BPI CEUs by Blogging for BPI

Started by Quinn Korzeniecki in General Forum on Monday. 0 Replies

What made this chimney fall down?

Started by Eric Kjelshus in General Forum. Last reply by Eric Kjelshus Jun 15. 5 Replies

Studies on Home Energy Audit Energy Savings Potential?

Started by Julie Saporito in General Forum. Last reply by Danielle Sass Byrnett Jun 15. 5 Replies

Latest Activity

Green ID posted blog posts
12 hours ago
Home Energy Magazine's blog post was featured

The Results Are In: These Are The Most Energy-Efficient Utilities in the US

Our first-ever scorecard of US utilities, released today, reveals striking regional differences and…See More
20 hours ago
Joe Konopacki replied to Brent Shapiro's discussion Investigating 3257KWH monthly usage issue.
"Brent, Using an ammeter, I would measure each 'hot' conductor leaving the fuses. (Find an…"
20 hours ago
Chris Allen is now a member of Home Energy Pros
20 hours ago

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service