Scott Katznelson replied to Scott Katznelson's discussion Insulating a scissor truss
"Interesting ideas. The walls are zip sheathing, taped at all edges, with a rain screen between the zip and the siding. I think it should be quite air tight. There is a soffit and ridge vent on all of one side and part of the other (this is an additi…"
Jun 1
Scott Katznelson replied to Scott Katznelson's discussion Insulating a scissor truss
"Hi Michael. Its a gable roof. Depth of truss is about 5 feet, with about a 1 foot heel. What's your thought?"
Jun 1
Scott Katznelson replied to Scott Katznelson's discussion Insulating a scissor truss
"Thanks for your reply. As I'm doing a drywall ceiling though, and blown insulation higher than the bottom chord, not too worried about thermal bridging. In some cases that would be a great plan."
May 14
Scott Katznelson replied to Scott Katznelson's discussion Insulating a scissor truss
"Thanks, thom.  Like the idea. Kind of double duty using the radiant barrier.  I'd be ok with the webbing, I think.  Waiting to talk to their insulation guy to discuss options with him."
May 14
Scott Katznelson replied to Scott Katznelson's discussion Insulating a scissor truss
"Encapsulate is perhaps the wrong word. The idea is to use netting over top of the desired insulation thickness to avoid the gradual drift downwards of the insulation. From what I've read this is essential for bottom pitches beyond 4/12, so I'm not s…"
May 14
Scott Katznelson posted a discussion
Hi all. Looking for opinions on how best to insulate a scissor truss. The attic in question will have have energy heel trusses with a bottom pitch of about 3/12; Soffit and roof vents with baffles. I'm concerned that just blowing insulation will end…
May 12
Scott Katznelson replied to Scott Katznelson's discussion Closed Crawlspaces
"Thanks. Interesting. Seems to consider balanced flow a lot but I've always considered it useful to have a positive pressure in the closed crawl. I'll have to look more into that."
Apr 1
Scott Katznelson replied to Scott Katznelson's discussion Closed Crawlspaces
"Thanks. "
Mar 27
Scott Katznelson posted a discussion
Hey all. I'm putting this out there to get your opinions on closed crawlspaces. What to do? What not to do?My current plan follows Design Sample 2 from Advance Energy. https://www.advancedenergy.org/portal/crawl_spaces/pdfs/Closed%20Cr...;
Mar 16
Scott Katznelson replied to Tom Smith's discussion Are Energy Efficient Windows worth the investment?
"The calculation involves heat loss across the window. Calculate the difference based on the u-value of each window type. Calculation is also climate specific. Then translate that BTU difference into dollars based on fuel type used and cost per unit…"
Nov 1, 2019
Scott Katznelson replied to Tom Smith's discussion Are Energy Efficient Windows worth the investment?
"Despite many fine comments, in the end, you either run your home's data through energy modeling software or you're just guessing.
In most (but not all) cases, window replacement will not return a payback in energy savings within even 15-20 years."
Mar 7, 2019
Scott Katznelson replied to Jerry Needham's discussion Blower door test for small apartment building
"Most of the work I do is retrofit of older buildings. Marriage wall leakage is often significant, although typically more through duct leakage between units than through the wall itself."
Oct 18, 2018
Scott Katznelson replied to Jerry Needham's discussion Blower door test for small apartment building
"The most accurate way to accomplish this is to have 4 blower doors running at the same time, one for each apartment (maybe less, depending on the layout of the building). This is the only way to get individual infiltration numbers while eliminating…"
Oct 18, 2018
Scott Katznelson replied to Jignesh's discussion Efficiency of furnace
"It is called the Distribution Efficiency Table. Here is a link to a PDF of it:
https://energy.mo.gov/sites/energy/files/bpi-distribution-efficienc...

Hope that helps"
May 10, 2018
Scott Katznelson replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in Energy Auditing Equipment for Sale, Trade or to Purchase
"HI.  I am in the market for one exhaust fan flow meter and a pressure pan.  Also a C-ring for the blower door. If you have any or all of those items for sale, please reply.  Thanks.  You can also email me at guystryder(at)gmail.com."
Dec 21, 2017
Scott Katznelson replied to Kevin Emerson's discussion Studies re: radon mitigation and energy efficiency
"I've read this article, too, and found it very informative. I now do not consider radon a major issue, certainly not at typical residential levels."
Dec 21, 2017
More…