I recently inspected a house that I am rating and discovered the HVAC contractor used Big 8 bubble wrap on the metal main duct in a vented attic in Climate zone 5. I spoke to the contractor about…Continue
"As a Rater and PH guy I have seen a number of units. You do get what you pay for. I also commission for Zehnder, about 180+ to date. Having the ability to dial in every room to meet a design spec is really special. 2 ECM fans and there…"
"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..."
"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…"
"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…"
"I’ll give you an a for effort but even in the best cases bubble wrap ( unless it comes with a certificate of testing and depending on what lab was used) means nothing.
If you can get a engineer’s stamp with signature maybe that might…"
"I think Ed and his video hit on an important point -- these radiant barriers are primarily addressing radiant energy. They aren't doing much to address conduction losses and, if not installed properly, will not address convection…"
"Agreed, But this guy fought me all the way. I have completed the rating and the HVAC contractor added R-8 on Top of the bubble wrap. We had to hit a HERS of 55 or below and when I gave the duct insulation R-1.1 it increased the HERS score to 57. the…"
"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…"
"@Dennis, without defending Big-8, I would point out that condensation (on duct surface) is a function of how well the vapor barrier (the outer layer) is sealed. This issue is exactly the same with conventional foil-faced fiberglass duct wrap. It,…"
"As a radiant barrier manufacturer I've been fighting this bad information for years. I've run into this claim for installing radiant barrier in attics many times. Which is similar the claims made for wrapping ducts. This is a…"
"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…"
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