Hello pros.

Please see the attached pictures.

Any insights on how you would insulate the 2nd story walls of this house? The house is located in the suburbs of Washington D.C.

Thanks!

Patrick

Views: 1945

Reply to This

Replies to This Discussion

Mr. Poll,

I'd take your list for our climate and edit it down to:

4.  As always with ice dams, air sealing and insulation are the first concerns.  Once that is done, then venting can be addressed.

6. Air tightness test and IR can your insulation and air barrier work. If good, drywall.

5. Ignore venting especially in lower slopes.

Have done a few of these in my time. Not easy, but can be done. I have taken 2 rows of shingles off, difficult because you have to get nails from not only the course you want to remove, but also, the row above that. Once the row is removed, I cut a 3 inch square out of the top of the course that is showing and keep that to be replaced. Drill your holes, fill with cellulose, install a tapered wooden plug, cover the plug with roof tar, replace the square you cut out earlier, cover this with a thin coat of roof tar, reinstall your shingle. Labor intensive, but I have had great success with it. Good luck.

Robert

It seems that you describe filing the entire cavity between the vertical interior wall and the steeply pitched lower roof with insulating material - is this correct?  How much insulation is this?  How do you ensure that you have sealed the open joist cavity ends?  In some of these built in recent times, we have seen the plywood interior subfloor extend out to the steeply angled roof so that filling the cavity with insulation does not address the open cavities - and these are the biggest problem with this type of mansard.  Second biggest problem in this particular case is the open party wall at both ends of the house (In this case, just one end because it is an end-row unit).  This open party wall would need some dense-packing.  Both the party wall and the joist cavities are the source of all the moisture that might be in the lower attic - in this DC climate.

You could then drill a 1 inch hole thru the soffit and fill the open end of the floor joists. If the soffit is large enough, drill your normal sized hole and fill it, plug, and patch. You can expect to go thru alot of material as the lower portion flairs out. Anything can be done, only limitations are your comfort levels.

Yikes. It is never as straightforward as one would hope in these "do it right" retrofits. The homeowner is getting itchy about implementing the work, especially because he has been given much misinformation (so it appears) from other "blow it and roll" contractors.

I may have to walk away from this one if he feels confident enough to just settle with more insulation is better than no insulation.

Patrick

Ed,

You put your finger on it: air seal floor cavity! The volume is triangular and the weight and force with dense pack will be borne by the soffit. I love cellulose, but may be best to open it up from below (or if re-roofing pull back the sheathing), do some air sealing and ensure your duct runs are"inside" the house.

Robert,

Very good idea. I have experience with patching roofs and re-roofing so that part will not be a problem.

Much preferred to the going through drywall route, and later having to patch and paint.

Happy holidays!

Patrick

Ok, What has happened since? 

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

jerry gentile replied to Chad Mcaulife's discussion BPI QCI Cert.
"you are spot on my friend-- during the exam I said this is ridiculous--- I have bpi certs for…"
2 hours ago
Eric Kjelshus commented on Jeremy Begley's blog post The Home Envelope : Does it Really Matter in a Heat Loss Caculation
"IT all matters,  I lot of sealing,  A lot of air barrier.  A lot of "R" A…"
15 hours ago
Michael Dunseith posted a status
"BPI Infiltration and Duct leakage (IDL) Certified"
20 hours ago
Jeremy Begley posted a blog post
23 hours ago
Kim Burnett 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
23 hours ago
Kent Mitchell commented on Adam Swain's blog post Top Worst Crawl Space Insulation Ideas
"Hi Adam - It sounds like you may be referring to enclosed crawlspaces - Here in the NW we've…"
yesterday
peter chang replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"I think it is quite possible the greatest savings will be realized by the lowest volume users. I…"
yesterday
Marie Fuentes is now a member of Home Energy Pros
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service