Comments on: What’s the Deal With Exfiltration? https://www.energyvanguard.com/blog/whats-the-deal-with-exfiltration/ Building science knowledge, HVAC design, & fun Wed, 21 Dec 2022 12:06:40 +0000 hourly 1 https://wordpress.org/?v=6.6.2 By: John Dabbler https://www.energyvanguard.com/blog/whats-the-deal-with-exfiltration/#comment-32423 Fri, 16 Dec 2022 15:28:31 +0000 https://www.energyvanguard.com/?p=7951#comment-32423 Is it still exfiltration if the air never makes it all the way through the wall assembly?

My question reminds me that I always thought it made sense (in theory) to have at least two air barriers…one on the inside and one on the outside.
When I see Rockwool insulation added to the outside of exterior sheathing, I wonder what the wind does to the effective r-value. Likewise, when I see zip-wall as the air barrier, and less details on the drywall, I wonder what air currents are going on inside the wall assembly from stack effect pressures.

]]> By: Chris Spychalski https://www.energyvanguard.com/blog/whats-the-deal-with-exfiltration/#comment-32422 Fri, 16 Dec 2022 15:20:17 +0000 https://www.energyvanguard.com/?p=7951#comment-32422 is stack effect significant at bathroom vent ducts, dryer vent too? Seems solving these would be “low hanging fruit”. Eliminate dryer vent with heat pump dryer or reduce with Heartland 21000 vent cap (like upside down coffee can in housing). For bathroom vent, 1 or 3 slotted vent exit gets blown open by wind so less effective.

]]> By: Michelle https://www.energyvanguard.com/blog/whats-the-deal-with-exfiltration/#comment-32417 Thu, 15 Dec 2022 14:02:33 +0000 https://www.energyvanguard.com/?p=7951#comment-32417 I love this article! Not only am I dealing with these specific issues in my own home, I have become a building science enthusiast because of it. Not to mention wanting to soak in every detail Mr. Alison Bailes writes about as he digs deep into the infiltration and exfiltration of the air quality world. It is a science, and a science with very real and strange consequences at best. My home being the proof of inhaling and exhaling everything from cellulose insulation to building materials and pollution. Thank you Mr. Alison Bailes for these great posts about the science of buildings, the air we breathe, and the fascinating ways in which it all works.

]]> By: Tom Turner https://www.energyvanguard.com/blog/whats-the-deal-with-exfiltration/#comment-32414 Wed, 14 Dec 2022 16:30:41 +0000 https://www.energyvanguard.com/?p=7951#comment-32414 Great topic and photo. Next time you open the door to a residence, open it gradually and pay attention to how much air is moved through the door. Dependent upon the prevailing wind you may get air passing you to enter the dwelling, or you may experience a gust in your face. Either way, this air movement is relative to the paths for leaky conditions that lead to exfiltration and infiltration.

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