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: 43

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

Hal Skinner replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Found an article that might help …"
2 hours ago
Bud Poll replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"Hi Tony, what/where is your climate?  Also, how is the rest of the wall constructed? Adding…"
2 hours ago
Sean Lintow Sr replied to Tony Rigdon's discussion Placement of 5/8" firewall, over or under foam board insulation?
"contact the local AHJ for sure - but for "fire" reasons it should be on the outside…"
5 hours ago
Tony Rigdon posted a discussion

Placement of 5/8" firewall, over or under foam board insulation?

I'm adding onto my personal residence and since the house is within five feet of the property line,…See More
6 hours ago
Hal Skinner replied to Hal Skinner's discussion Rooftop A/C units and exposed ductwork in the group The RCC Classroom (Radiant Control Coatings)
"Hi Tom.   As far as media advertising goes for the good RCCs, it really doesnt work well at…"
8 hours ago
Sean Lintow Sr commented on Chris Laumer-Giddens's blog post Mini-Split Heat Pumps are Quirky, Especially their Capacity
"Quick question Chris - the set & forget (for temperature setbacks) is that with any or just…"
10 hours ago
Martin Smith joined Hal Skinner's group
Thumbnail

The RCC Classroom (Radiant Control Coatings)

A group where energy professionals can learn about all the different energy saving aspects of…See More
12 hours ago
Anthony Cox added a discussion to the group Job Board
Thumbnail

PROJECT MANAGER/BUILDING SCIENCE TRAINER Community Housing Partners Christiansburg, VA

We are hiring and below is link to apply for the position we have available at Community Housing…See More
12 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service