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: 72

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

Discussion Forum

Two Part Epoxy and Repair of Structural Wood

Started by John Poole. Last reply by Patrick Michael Hayes Oct 14, 2016. 11 Replies

Historic Windows: UV and Thermal Transfer

Started by John Poole. Last reply by Shade Structures Jan 31, 2013. 23 Replies

Historical Window Energy Efficiency Upgrade Standards?

Started by David Clark. Last reply by Robert R Gilbert Jul 13, 2011. 11 Replies

Historic Windows: Air/Moisture Infiltration

Started by John Poole. Last reply by Bill Bradbury Jul 10, 2011. 1 Reply

Spanish Style Architecture Wall Construction Details

Started by John Nicholas. Last reply by Bill Bradbury Jun 29, 2011. 2 Replies

Latest Activity

tedkidd replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"Yeah. Gas water…"
18 hours ago
Eric Kjelshus replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"With super cheap natural gas prices now, still worth going all electric?  Tankless needs a lot…"
20 hours ago
Stuart Langley liked Chris Clay's photo
yesterday
David Butler replied to David Butler's discussion How would you insulate this roof?
"Stuart, I wasn't considering the copula windows... yes, those would indeed need to be…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"Well, @David Butler, you have seen the property more accurately than I have, but my impression of…"
yesterday
David Butler replied to David Butler's discussion How would you insulate this roof?
"@ Stuart,I don't think there's any concern about impact of 4" build-up on elevation…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"So this building has a few issues with air leaks and air leaks have so much to do with discomfort…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"John Hatfield has the right idea here for a new roof deck. Polyiso boards always need a good stout…"
yesterday

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service