Jack Baikoff
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  • Portland, OR
  • United States
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Jack Baikoff's Discussions

Real data on the magic of Low E coatings for cold climates?
2 Replies

I bet most of you are familiar with the claims of the window industry marketing a Low-E coating as a Cure-All for any house, any climate and any window, no matter what direction it faces. You have…Continue

Started this discussion. Last reply by Kurt Albershardt Oct 25, 2013.

Just how much does adding air barrier to a knee wall insulation increase it's performance?
29 Replies

I know we have a lot of scientifically minded people here and I bet someone has access to a reliable test data showing the answer to the question that's been on my mind for years:When we add…Continue

Started this discussion. Last reply by Jack Baikoff Oct 25, 2013.

Vermiculite in the fireplace
8 Replies

As an energy auditor I occasionally see vermiculite in the gas fireplaces. Does anyone know if any of the vermiculite they use(d) for fireplaces has asbestos fibers and if it's safe to run blower…Continue

Tags: Fireplace, Vermiculite

Started this discussion. Last reply by Brian Robinson Sep 30, 2013.

Measuring fresh air intake ducted to a return and no way of measuring from outside.
22 Replies

I am sure this is a challenge that some of you have faced before:You have an air handling system with fresh air intake that is ducted into the return and is terminated on the outside in a way that…Continue

Started this discussion. Last reply by Dale Sherman Feb 7, 2013.

 

Jack Baikoff's Page

Latest Activity

Talena Marie Ross commented on Jack Baikoff's photo
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Spaces we have to work in.

"Looks quite cramped, and like  Michael said it is a great thing that it isn't in July!"
Apr 10
Jack Baikoff commented on Michael Dunseith's photo
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HEP Certs 4

"Impressive. BPI must love you!"
Oct 25, 2013
Jack Baikoff replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Wow, guys! I am quite surprised to see how much this topic has stirred.  That's good, I hope this is the case where out of a group conversation and a common search some clarity comes up. So far it hasn't cleared that much, I agree…"
Oct 25, 2013
Kurt Albershardt replied to Jack Baikoff's discussion Real data on the magic of Low E coatings for cold climates?
"So much of this depends on the size and orientation of the window.  North-facing picture windows are more common than one would suspect, and with our high altitude dark nights, you can really feel the "suck" from the night sky. New…"
Oct 25, 2013
Tony Ramirez replied to Jack Baikoff's discussion Real data on the magic of Low E coatings for cold climates?
"Low E helps in summer when the sun is at a different angle.  The UV rays reflect differently then the winter, when the sun is lower.  Heat is better reflected in summer versus winter due to the angle of the sun during the seasons.…"
Oct 21, 2013
Ed Minch replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Brad, my belief is that "it depends" is so much a factor here that a study would be meaningless.  The extremes would be if the batt has fallen at one end, and would be insulation properly contacting the interior drywall and no wind…"
Oct 19, 2013
Brad Cook replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
""When we add Vapor-permeable Air Barrier to those knee walls just how much exactly that increases the performance of that insulation?" The original post by Jack is an excellent question, asking if anyone knows of actual testing…"
Oct 19, 2013
Ed Minch replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Covering the kneewall back serves 3 purposes.  1) it prevents the batts from falling off later on 2) it forces the batt to contact the drywall 3) it prevents wind washing. This is why it is very hard to measure the effect of covering the…"
Oct 18, 2013
Ed Minch replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Anthony I am not getting that you need to cover the kneewalls according to this provision. You can have an airtight kneewall with no back on it.  I think what they are talking about is "below" the kneewall, between the joists. By the…"
Oct 18, 2013
Anthony Hyde replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"In the past contractors installed a non perforated material similar to this as a radiant barrier in attics, often spread flat over the insulation in the attic floor. Moisture condensed into liquid water on the bottom side and created problems. …"
Oct 18, 2013
Nate Adams replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Honest Building Science question on this topic: If the drywall of the knee wall is well sealed (meaning outlets, top and bottom plates, etc) as well as the floor joist below, if there are fiberglass batts in the knee wall, is is really that…"
Oct 18, 2013
Anthony Hyde replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Try the Air Leakage heading  N1102.4.1.6 N1102.4.1 Building thermal envelope. The building thermal envelope shall be durably sealed to limit infiltration. The sealing methods between dissimilar materials shall allow for differential expansion…"
Oct 18, 2013
Ed Minch replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Anthony  Can you cite the code section that requires a back on a kneewall? thanks Ed Minch"
Oct 18, 2013
Bruce Dichter replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Is it possible that the perforations in the backing of the batt insulation are intended to allow for water vapor diffusion and not serve as an air barrier?  Generally moisture will move from hot to cool, and if it gets trapped in an assembly…"
Oct 18, 2013
Anthony Hyde replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"Yes, I do, from the third party consultant/auditor/consumer advocate side, not the supplier/installer side."
Oct 18, 2013
Nate Adams replied to Jack Baikoff's discussion Just how much does adding air barrier to a knee wall insulation increase it's performance?
"You caught me being lazy, I don't have time to go look up the ASTM air barrier test it passed at the moment. The material can be left exposed, it's inexpensive, it provides an air barrier, it's easy to install - I like it as a…"
Oct 18, 2013

Profile Information

Company
Pyramid Heating and Cooling
Professional Certification
BPI BA,Envelope, Heating, HERS, PTCS, Thermographer Lv1
Professional Interests
Solar thermal, Passive homes
Website URL
http://baikoffphotography.com

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