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: 51

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

Photos

Loading…
  • Add Photos
  • View All

Latest Activity

Sean Lintow Sr added a discussion to the group Best Practices (Residential)
Thumbnail

Radon - Passive Systems

Just curious - many locals (per codes) require…See More
5 minutes ago
Duncan Cumming posted a blog post

Preparing for Winter: Time for Your Central Heating Check Up

With winter just around the corner, make certain you are not left out in the cold – get your…See More
3 hours ago
Joe Crisara posted a blog post

Give Your False Assumptions a Knockout Punch

By Derek LauberWe face seemingly unlimited obstacles when trying to manage and grow our…See More
15 hours ago
Profile IconJoe Crisara, Earth Advantage, Sydney G. Roberts and 6 more joined Home Energy Pros
15 hours ago
Jonny Fisher added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Minneapolis Blower Doors and Duct Blaster for sale

I have two Minneapolis Blower Doors + DG 700, duct blaster with manometer and some other…See More
16 hours ago
Jonny Fisher replied to Hamed Ghanbari's discussion Need a Minneapolis Blower Door + DG 700 in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"I have two Minneapolis blower doors with DG 700.  I also have some other used equipment if you…"
16 hours ago
Nolan Walker replied to Hamed Ghanbari's discussion Need a Minneapolis Blower Door + DG 700 in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Hi Hamed, I have an extra Minneapolis blower door system - nolanwalker@gmail.com for more…"
17 hours ago
Mike Burton replied to Hamed Ghanbari's discussion Need a Minneapolis Blower Door + DG 700 in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"I have a Minneapolis Bloor Door + DG700 I am wanting to sell. Please contact me at…"
19 hours ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service