Ed Minch
  • Chestertown, MD
  • United States
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Cold climate wall
2 Replies

I have heard Joe Lstriburek twice say that a wall in this climate (Albany NY, almost 6,000 DD) should have 1/3 of the R-value on the outside of the structure and 2/3 in the cavities to prevent…Continue

Started this discussion. Last reply by Don Hynek Jul 11.

Duct testing in a conditioned crawlspace
13 Replies

Concerning duct testing in crawlspaces (this is for new houses for Energy Star, but will be the same for existing houses):I have a house on a conditioned crawl with ducts in that crawl.  There is an…Continue

Tags: testing, duct, crawl, conditioned

Started this discussion. Last reply by Ed Minch Nov 25, 2011.

 

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Cold climate wall

I have heard Joe Lstriburek twice say that a wall in this climate (Albany NY, almost 6,000 DD) should have 1/3 of the R-value on the outside of the structure and 2/3 in the cavities to prevent condensation inside the wall. So 3 questions:1) Is there agreement that this generalization covers most bases?2) I have a couple of ideas in mind, but has anyone come up with a wall they have had success with?3) Would wet-spray cellulose in the cavity reduce the potential for condensation inside the…See More
Jul 14
Don Hynek replied to Ed Minch's discussion Cold climate wall
"My quick and dirty guess is that you have the proportions backward. For 30 years, cold-climate builders used a little bit of exterior insulation, to reduce thermal bridging. But if you went overboard, the wall couldn't dry to outdoors, and rot…"
Jul 11
Sean Lintow Sr replied to Ed Minch's discussion Cold climate wall
"A few quick thoughts: For #1 - that is the minimum, he would say the optimal is all insulation on the outside (see his perfect wall) --- oh I am sure many will disagree especially when you get to NAHB, but yes that is a good rule of thumb. #3 - as…"
Jul 10
Ed Minch posted a discussion

Cold climate wall

I have heard Joe Lstriburek twice say that a wall in this climate (Albany NY, almost 6,000 DD) should have 1/3 of the R-value on the outside of the structure and 2/3 in the cavities to prevent condensation inside the wall. So 3 questions:1) Is there agreement that this generalization covers most bases?2) I have a couple of ideas in mind, but has anyone come up with a wall they have had success with?3) Would wet-spray cellulose in the cavity reduce the potential for condensation inside the…See More
Jul 8
Ed Minch commented on Brett Little's blog post Despite record breaking cold winter our MI GreenStar Certified home saved 50% Energy!
"Brett Good work.  Do you have a before-and-after blower door number?  Was the foam in the attic on the attic floor or at the roof sheathing? Ed"
Jun 3
Ed Minch replied to Brandon Walton's discussion When is it too windy to use blower door?
"Colin at Retrotec has told me that you can't get any more accurate than a 120 second baseline and a 120 second time average blower door test, multi-point included. However, bear in mind that the ASTM standard states 20 MPH as the upper limit,…"
May 15
Ed Minch replied to George Kopf's discussion Heat loss from ducts
"Bob I ghink you are referring to two different issues.  One is the time per cycle to help keep efficiency high and that is what variable speed systems are all about  - keep the thing running so its efficiency stays near max. The…"
May 11
Ed Minch commented on Greg Labbe's blog post New Air Tightness Record in Ontario (Dare I say Canada?)
"What is the dollar savings per year between .6 and .3 ACH50. Great to have a contest, but is the extra effort worth it?"
May 8
Ed Minch replied to Roy Sakamoto's discussion Whole house air leakage
"This is definitely worth investigating if you are an air sealer and are forced to use the ACH50 metric. First look at a 1500 ft2 ranch on a slab at 50'X30' with an 8' ceiling.  It has a volume of 12,000 ft3, and a surface area,…"
Apr 1
Ed Minch replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Sean I am still wondering why we need airsealing in the center of a piece of plywood that is already airtight.  The money would be better spent on a layer of rigid foam on the outside so cut down on thermal bridging and to add R-value."
Mar 28
Ed Minch replied to Roy Sakamoto's discussion Whole house air leakage
"Dob Do the math on that one - any volume based measure favors big houses because the volume is not what is leaking - the surface area is.  A small house has more surface area per ft3 than a big house, so gets penalized.  I have measured…"
Mar 27
Ed Minch replied to Roy Sakamoto's discussion Whole house air leakage
"Don H- +1 to everything you said.  Something to add is that it depends entirely on the metric you use. If you use ACH50 which is becoming the norm where the 2012 IECC is used, you must seal every square foot of envelope on a 1200 ft2 house on a…"
Mar 27
Ed Minch replied to Luis Hernandez's discussion Open cell foam and cellulose... Can they work together?
"Why not just seal the actual leaks in the attic floor, then blow with cellulose and save a bunch of money?  This is similar to flash-and-batt in exterior walls and I have yet to understand why this is done.  My theory is that the closed…"
Mar 27
Ed Minch replied to Kent Mitchell's discussion Fire sprinklers & air infiltration?
"This is not the only problem with sprinklers.  Any pipe in the attic with water in it must be protected from freezing, and the standard practice in the mid-Atlantic has come to be called "tenting".  The insulator will cover the…"
Mar 20
Ed Minch replied to Griffin Hagle's discussion Which is the valid draft test?
"I see what you mean - but the title of the thread is: Which is the valid draft test, noir which is the valid CAZ test "
Mar 12
Ed Minch replied to Griffin Hagle's discussion Which is the valid draft test?
"Ted Still too cryptic"
Mar 12

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RESNET QAD, BPI BA, EP
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http://energysvc.com

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At 7:12am on December 24, 2010, Diane Chojnowski said…

Hi Ed,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the
place for you!

Don't forget to upload your profile photo. And, add your location on our Member
Map
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Thanks!
Diane, HEP Moderator

 
 
 

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