I am convinced that a client of mine is the victim of a shoddy crawl space ceiling insulation job, and that he should have it done right. He too in convinced.

So, the question is how best to address it. 

The crawl space is only 200 sf, located below a single-room addition, with ducts in the floor. There are plenty of penetration through the floor and the sill boxes. Air is the least of our worries (it's the darn critters he wants to keep out, and reduced leakage is a bonus). The existing faced fiberglass batts (R-19) are showed into between the joists, with the kraft facing in the wrong direction. The batt insulation is only 5 years old, and it's condition has not been compromised. 

The following is my proposed approach to the problem. Remove the existing batt insulation, apply a flash coat of closed-cell spray foam, cut batts to fit properly, install wire supports to keep batts flush with floor, and install a layer of house wrap to underside of joists to protect batt insulation. Sound like a winner to you pros?

Thanks in advance!

Views: 672

Reply to This

Replies to This Discussion

For the cellulose and rigid I wouldn't worry about the foaming of penetrations unless they are big enough to have a blow out in the living space.

 

For the fiberglass and rigid, I think foaming the perimeter to seal off any leaks would be good, but probably nothing other than that.

Good luck out there.

Thanks, and thank you for your input Cory!

Housewrap as your blowing barrier makes a lot of sense, though it's like wall papering a ceiling getting it in place!!

I dunno about the foam board. Where I come from (cold climate) that might work with unfaced EPS board. But If you use foil-faced Thermax, that leaves you with a vapor retarder on the cold side of the assembly, doesn't it?? Great idea in an A/C-dominant climate. But that's a really bad idea here in Wisconsin.

Don you raise a couple of good points.
As to your points about the rigid foam, the foil facing would be on the cold side, but with Thermax you have foil facing on both sides. Also, I always do all within my power to achieve an effective air seal, which has eliminated any condensation-related issues in the past. Nevertheless, I am going to think further about the points you have raised.
Patrick

RSS

Forum Discussions

Too many Heat Pump Water Heaters in a basement?

Started by Brad Cook in General Forum. Last reply by David Butler 21 hours ago. 9 Replies

How would you insulate this roof?

Started by David Butler in General Forum. Last reply by David Butler 22 hours ago. 2 Replies

Dirty solar panels

Started by Evan Mills in General Forum. Last reply by Stacie Bagnasco yesterday. 1 Reply

Fixing a water heater?

Started by John Shillito in Best Practices. Last reply by Eric Kjelshus on Friday. 21 Replies

Latest Activity

Profile IconSarah Burger, Troy Spindler, Mike Berg and 3 more joined Home Energy Pros Forum
1 hour ago
David Butler replied to Brad Cook's discussion Too many Heat Pump Water Heaters in a basement?
"theoretically, let's say you perfectly isolate the HPWH from a heat source. The HPWH's…"
21 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"Interesting idea. Commercial roof on a slope! Typical density for roofing spray foam is 2.5 to 3.0…"
22 hours ago
Summer Redman added a discussion to the group Job Board
Thumbnail

Hiring 2 Training Specialists in Champaign-Urbana, Illinois

The Applied Research Institute (ARI) at the University of Illinois at Urbana-Champaign is seeking…See More
23 hours ago
Summer Redman joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
23 hours ago
Profile IconJeff Farlow, John Hatfield, Crystal McLain and 5 more joined Home Energy Pros Forum
yesterday
Stacie Bagnasco replied to Evan Mills's discussion Dirty solar panels
"This is a great idea. I clicked on your discussion because it made me remember that I forgot to get…"
yesterday
Kirsten Richnavsky posted an event
Thumbnail

rCloud - The Future of Testing at Your Office or Home

October 18, 2017 from 2pm to 3pm
Integrating rCloud as an essential part of your RESNET QA process.Retrotec’s rCloud app is here,…See More
yesterday

Photos

Loading…
  • Add Photos
  • View All

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

Badges  |  Report an Issue  |  Terms of Service