Historic windows almost invariably present two specific challenges to home energy efficiency:

1) Air & moisture infiltration/exfiltration

2) UV & thermal transfer

Assuming that sashes are in good shape and weather tight, infiltration/exfiltration and moisture are often still problematic because sashes often don't fit tightly; for example, if the window frame is not completely square, or because of a general lack of sealing between the sash and frame. The window frame and casing often are also in need of sealing. In the worst case, an inadequate drainage plane might result from poor flashing, inadequate sill slope, or an inward leaning wall, causing water accumulation, deterioration, rot, mold, etc.

 

This thread invites further questions, as well as useful solutions that anyone might've devised, or otherwise observed, in solving these issue. In particular, we are interested primarily in solutions that emphasize preservation and repair, primarily, and replacement with historically accurate components only when repair is not possible. That is, we are generally striving for minimal impact to historic fabric.

 

(Please note that I will launch a separate thread covering UV & thermal transfer. Thanks!)

Tags: Infiltration, Moisture, Preservation, Sealing, Windows

Views: 44

Replies to This Discussion

Hi John,

Thanks for starting these historic window threads. I am passionate about this topic.

David Clark covers window rebuilds on his post, but I have found massive air leaks around the outside of the window buck on older masonry homes. I remove the trim and spray foam the gap. If you think the drain plane is compromised, you can check this at the same time.

I buy my weatherstripping from Conservation Technology, they are high quality and they carry pretty much anything you need.

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

Rob Madden, Solar Home Broker commented on Alicia Hobbs's blog post 5 Solar Facts that You Should Know
"From personal experience, that $20,000 savings over 20 years will be a low number based upon the…"
2 hours ago
Rob Madden, Solar Home Broker posted a blog post

Phoenix Solar Home Sales Jump in September

The number of solar home sales in Phoenix jumped 13.6 percent from the previous month, according to…See More
2 hours ago
Profile IconGina M., Brian J. Mulhern, James Tucker and 2 more joined Home Energy Pros
4 hours ago
Casey Gesell replied to Trip Smith's discussion Where to spend my marketing dollars?
"Trip, Check out our sister company Contractor Nation: https://www.contractornation.com/ Pay Only…"
4 hours ago
Casey Gesell posted a discussion

Looking for home improvement companies to join our dealer network!

My name is Casey Gesell and I'm the Business Development Manager at Dr. Energy Saver, Inc.Dr.…See More
4 hours ago
Casey Gesell replied to Trip Smith's discussion Starting a Home Weatherization Business. Considering it...
"Hi Trip, Check out our website: www.drenergysaverdealerships.com "
4 hours ago
Alicia Hobbs posted a blog post
4 hours ago
Mark Wozniak posted a status
"I am looking for energy efficiency software training in Massachusetts."
7 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service