Dennis Heidner
  • Kirkland, WA
  • United States
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Latest Activity

Dennis Heidner replied to Mark Furst's discussion Worst boiler ever?
"Wow,  a combination boiler and basement fireplace... great for toasting marshmellows and hotdogs while awaiting the fire department...."
May 23
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"Pests are also a really good reason to seal duct work with either the approved mastic OR aluminum duct tape... not the sticky "un-Duct" tape that DIYers use... "un-Duct" can be tasty for some critters..."
May 22
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"If you look closely ... can you see rat or mice teeth marks on foil?   Some of the modern materials are gourmet meals for rodents.   E.g.  they really enjoy a snack on some PEX  or the insulation from some automobile…"
May 22
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"I believe one of the issues is how does one defend themselves against an HVAC contractor that insists it is okay.   And the answer to that would have to be pull articles from ACCA or AHRI which say that reflective bubble wrap is worthless…"
May 20
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"Links for Build America and Building Science…"
May 20
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"Correct,   but when testing has been done on sealing ducts with wraps... (See the BTO and Build America website for reports... plenty of research done by ASHRAE and universities also) the seals are never really tight enough to prevent the…"
May 20
Dennis Heidner replied to John S. Rodenhizer's discussion Using radiant barriers as duct insulation, Aka "Bubble wrap" What value do you assign for R-value?
"Read the manufacturers claims and installation steps closely  The foil needs a dead space  "To achieve a thermal resistance of R-8, 2-inch-wide spacer strips of rFOIL™ reflective foil insulation arewrapped around the duct…"
May 19
Dennis Heidner replied to Luis Hernandez's discussion Water heater ventilation question
"I don't think he needs to worry about the vent.  I think he saw what appeared to be yellowing pipe and a possible burn on the pipe and was concerned. CPVC has a higher temperature rating than ordinary PVC.  Often around 180F under…"
May 8
Dennis Heidner replied to Luis Hernandez's discussion Water heater ventilation question
"The wording from one of Luis's post on April 20th, seemed to imply that the heater was a boiler not simply a water heater.   If the temp measured was using IR point&shoot measurement - my guess is the 180F reading was either…"
Apr 30
Dennis Heidner replied to Luis Hernandez's discussion Water heater ventilation question
"This really looks like burn marks when someone replace copper fittings to the right of the vent.  It also looks like they used CPVC for the first six inches before moving to ordinary PVC.  That could also be why you see "yellow"…"
Apr 29
Dennis Heidner replied to Luis Hernandez's discussion Water heater ventilation question
"If you decide to replace or change out the vent pipe,  it might be quite interesting to save it and have it sectioned where the area appears to be discolored from heat.  If it was indeed heat the discoloring is likely to be all the way…"
Apr 29
Dennis Heidner replied to Luis Hernandez's discussion Exterior green cladding
"For cedar plank siding,  if you want to remove and reuse,  use a punch to push the nails through (or if large nail heads, pull them.  its slow.),  but if the siding is coming off on its own and the cedar siding is old (50+…"
Apr 19
Dennis Heidner replied to Luis Hernandez's discussion Exterior green cladding
"Why do you feel the planks are too old?  Are they falling off themselves?  Cedar siding grays and can show signs of decay on the outside while still being able to protect the structure. As for alternatives - what part of the country do…"
Apr 18
Dennis Heidner replied to Don Fugler's discussion Difficult retrofits in the group Kitchen Ventilation
"If you have a microwave oven in the same approximate area - repeat some of the tests with the microwave (using covered microwave save pans)  I think you see numbers that are in the same range.   I suspect you could see some of the…"
Apr 15
Dennis Heidner commented on Bob Krell's group Healthy Indoors (IAQ)
"Comment for Rob concerning window AC units.   Outside air and inside air don't mix in most of the window units.   If you look at the window unit and the filter that they use on it... It's like a MERV 0 or maybe -1....…"
Apr 7
Dennis Heidner joined Bob Krell's group
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Healthy Indoors (IAQ)

The Healthy Indoors group is focused on indoor air quality (IAQ), mold, moisture control, radon, lead, air duct cleaning & HVAC hygiene, and building performance/ building science-related topics that affect the healthiness of our indoor environments, like air leakage.See More
Apr 7

Profile Information

Company
Rextorgroup
Professional Interests
Energy efficiency, building envelop, renewables, building modeling

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At 3:25pm on March 21, 2013, Diane Chojnowski said…

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​​Exploring the Benefits and Logistics of Implementing a Building-wide Water Monitoring System - Free CE Webinar at Webinar Online

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The problems with gas stoves

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David Butler replied to Rob Madden's discussion Where is the money in energy auditing / home rating?
"Ok, now I understand. I think that happens pretty much everywhere. But forgoing energy retrofits at…"
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Leslie Jackson commented on Leslie Jackson's blog post Introducing a Retrofit Series
"Thanks, Jan, Did you write yours up anywhere? I would love to see the before-and-afters."
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Jan Green commented on Leslie Jackson's blog post Introducing a Retrofit Series
"Looking forward to the follow up.  I Just did one of these.  You never know till you…"
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