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: 191

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

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Judy Rachel replied to Dean Kirkland 's discussion Im looking for a blower door / duct blaster / manometer rental in So Cal
"You can borrow the equipment from the Tool Lending Library maintained by SoCalEdison.  This is…"
5 hours ago
Profile IconSteve Last, Paul J Anzalone Jr, Jon Traudt and 1 more joined Home Energy Pros
19 hours ago
Jamie Medlin replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Please let me know if the flowhood  still for sale. jmedlin@archonenergysolutions.com"
yesterday
Jamie Medlin joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
yesterday
Laurie DiDonato posted an event
Thumbnail

HERS Rater Training Discount: Register by 1/6/17 and Get $100 Off! at Energize CT Center, North Haven, CT

January 23, 2017 to February 3, 2017
Become a HERS Rater with the NEHERS Alliance!Online Component: January 23rd-February 3rd, 2017 -…See More
yesterday
angela stanzione replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Yes, I do. Pictures are above. I have a newer fan, I have a frame in a case and I have panels."
yesterday
Tom Phillips replied to Bruce Ceniceros's discussion How effective are whole house air cleaners?
"re: costs:  I suspect the added UV & PCO & ESP has a big price tag but no clear…"
Thursday
David Baerg replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Hi Angela, Do you have any fans left?  Frames?  Panels? Thanks, Dave"
Thursday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service