Hi out there. I have been running into customers that want to upgrade their wall insulation, but have batts in the walls. In checking with local insulation companies, one says he has foam injection system that works but is $2.00 a sq. ft., the other says there is nouthing he knows of that works. Let me know whats going on out there, so I can pass good information on to my customers.

Have a Great Day!!!!!!!

Views: 88

Reply to This

Replies to This Discussion

There are foam companies that will add foam to existing batt insulation, but I'm a skeptic and would want some guarantees and lots of IR pictures.  Maybe even a few addresses where this has been done before so I can look with my own camera.

Improving 3.5 inch walls is difficult.  If the foam can be done and done right, maybe, but at $2 a sq ft a 1,500 sq ft ranch would be around $2,500, I would run some numbers to see if that works.

In the long run, I always look inside and outside to see if other work is in the near future.  If new siding will be needed soon, then adding rigid foam under the siding might combine to be a lot less expensive.  If inside renovations are planned, padding out a wall, electric, windows, yada, yada, may also be an option.

One of the problems with adding foam to an already insulated wall is that the increase is not all that much and the existing fiberglass actually gets in the way reducing the quality of the new install.  So you end up going from an 11 or 13 cavity to a 15 or 18 cavity.  It would be better if the fg wasn't already there.  Those numbers came from my back pocket area so take your own guess, but they illustrate that the improvement isn't all that great.  Adding a couple of inches of rigid over the outside with new siding also covers from foundation to top plate along with all of the thermal bridging.  Much more impressive results.

Bud

Thanks, kind of what i was thinking. Lets see what others think.

I'm going to back Bud on this one. Spraying in foam and hoping it will effectively fill in around the FG is essentially hopes and dreams kind of thinking.

In a case such as yours, the best bet is to tighten up where you can, add insulation to places like the rim\band joists (if exposed), and begin to plan for a more comprehensive project in the future (where wall insulation is combined with interior renovation and\or siding replacement). 

In my neck of the woods, most houses are faced with a brick veneer (with no insulation in the walls), so the only real way to approach this is to talk to them about making a mess in their houses and them becoming okay with this over time. By "this" I mean the mess that typically accomodates drilling into the sheetrock\plaster, installing cellulose or icynene, and then patching up the holes used to install the insulation. 

Patrick

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

Mst. Fatema Aktar is now a member of Home Energy Pros
1 hour ago
Robert Leone added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Blower Door Package for Sale

Hi,I am selling my blower door with extras as a package or individually. These items are used but…See More
7 hours ago
Profile IconRobert Leone and Richard Vito 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
7 hours ago
Richard Vito joined Sean Lintow Sr's group
Thumbnail

Best Practices (Residential)

Best Building, Retrofitting, or even Auditing Practices - what are they, what should change, what…See More
15 hours ago
Richard Vito joined James Sayers's group
Thumbnail

Marketing Energy Efficiency

Sharing ideas, tools and examples of promoting energy efficiency to consumersSee More
15 hours ago
Richard Vito joined Allison A. Bailes III's group
Thumbnail

HVAC

HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements,…See More
15 hours ago
Richard Vito joined Kyle Brown's group
Thumbnail

Wrightsoft - Manual J / Manual D

If you use Wrightsoft to calculate loads or design ducts, you likely have questions.  Get answers…See More
15 hours ago
Jim Gunshinan commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"I had a revelation while attending Bruce Manclark's session of duct leak testing at the Energy…"
yesterday
George J. Nesbitt commented on Jim Gunshinan's blog post Energy Upgrade California—Up Close and Personal
"Blower Door; the 2007 test was a depressurization test, and the 2014 a pressurization test, which…"
yesterday
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Plan, plan, plan, plan. The 1st step to is to understand the house, how it's built, the…"
yesterday
George J. Nesbitt posted an event

High Performance Windows - A Panel of Experts at Pyramid Alehouse`

April 26, 2014 from 3pm to 5pm
Join a lively panel discussion on high performance windows. We'll cover some basics, as well as…See More
yesterday
Kaushal Bharath Raju replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Hi David, Thanks for pointing out Martin Holiday's article. I do not wish to engage in the…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service