Recent Comments and Answered Questions on Green Building Advisor

  • | Jul 28,2017 03:03 PM EDT
    Just curious if lauan plywood would be a better option without off gassing risk ? or is perm rating a big deal. Is vapor perm only a concern from living space to attic or does hot humid attic air ...
  • Jon R | Jul 28,2017 02:08 PM EDT
    See below for "The dumb way is to use a plastic sheet." https://buildingscience.com/documents/insights/bsi082-walking-the-plank I'm curious why you used spray foam vs less expensive rigid ...
  • Dana Dorsett | Jul 28,2017 01:57 PM EDT
    Find out how thick the foam is, even if you have to drill a hole with hole saw (for ease of repair) to get an accurate measurement.
  • Dana Dorsett | Jul 28,2017 01:53 PM EDT
    You don't need to cover the entire surface of your ripped paneling air barriers with closed cell foam- you only need to seal up the cracks & edges of the panel, as well as other other ...
  • Robert Opaluch | Jul 28,2017 01:48 PM EDT
    Its difficult to make accurate predictions for many things, looking only 3 years into the future. Five year predictions seems like guesswork when it comes to technology. They are talking about ...
  • Dana Dorsett | Jul 28,2017 01:41 PM EDT
    Interior foam (even over pre-existing drywall) can work just fine from a moisture point of view, but the ability to dry toward the exterior matters. Vinyl siding being inherently back ventilated ...
  • | Jul 28,2017 01:02 PM EDT
    When you say closed cell spray foam buys me nothing , i have cracks everywhere along edges and interior load bearing wall . I thought closed cell spray foam would buy me alot of air sealing. Is ...
  • John Clark | Jul 28,2017 01:02 PM EDT
    I wouldn't because you could trap moisture within the drywall and generate mold. Then you have electrical issues (wiring running through flammable foam). Just tear out the drywall or are you ...
  • Charlie Sullivan | Jul 28,2017 11:51 AM EDT
    The crew we had a bad experience with was from a different branch of "Quality" Insulation, so that's not very encouraging, but the reason we initially went with them was largely based on a ...
  • Ben C. | Jul 28,2017 11:06 AM EDT
    I'm in northwestern NJ (climate zone 5). I want to cover interior walls. I was thinking 3" EPS and then 1/2" drywall over the existing drywall. If I leave the existing drywall intact, the 3 inches ...
  • Steve Knapp CZ 3A Georgia | Jul 28,2017 10:42 AM EDT
    Ben, Where in the northeast? Is the wall you want to cover an interior or exterior wall?
  • | Jul 28,2017 10:39 AM EDT
    Thanks Dana. That confirms what a friend of mine told me as well. 01776 is my zip (Sudbury). Probably about the same as Worcester. The construction is post and beam with wooden walls on two ...
  • Dana Dorsett | Jul 28,2017 10:34 AM EDT
    Concrete is extremely moisture tolerant, and functions just fine when completely saturated (as with foundation footings and bridge piers in rivers). Trapping it in a moisture trap is ...
  • Steve Knapp CZ 3A Georgia | Jul 28,2017 10:34 AM EDT
    Howard, I would install a waterproof membrane such as Schluter-Kerdi over the cement panel. The system is pretty straightforward.
  • Dana Dorsett | Jul 28,2017 10:29 AM EDT
    The ripped paneling detailed as an air barrier is fine, but the environmentally & financially costly closed cell foam overcoat buys you nothing. Using a bead of closed cell foam or can-foam to air ...
  • Steve Knapp CZ 3A Georgia | Jul 28,2017 10:23 AM EDT
    How much clearance do you have between the top of the shed roof and the second story window closest to the bump out. I ask because the best option would be to install rigid foam on top of the ...
  • TIM LANGE | Jul 28,2017 08:37 AM EDT
    Zone 7. North Dakota. Pulled shingles off and looked in the cavity. It is framed with 2x4 for rafters and joists. 16" OC. Slope is 3.6" per ft; I estimate 20" of 2nd story wall in the cavity ...
  • Chris Roche | Jul 28,2017 08:23 AM EDT
    Hi Charlie, Thanks for the response! Your thoughts on spray foam do resonate with me as well. I have been somewhat opposed to going that route from the beginning. I also have a walk out ...
  • John Clark | Jul 28,2017 07:57 AM EDT
    IMO most slabs in the past did not have a vapor barrier between the slab and soil so this is why installers recommend a vapor barrier between your flooring and basement slab. In your instance the ...
  • | Jul 28,2017 07:52 AM EDT
    I decided against cut up cardboard in the attic. Does anyone see a problem with wood paneling ripped to fit in between the joists in attic . The wood paneling would be laid against tongue and ...
Register for a free account and join the conversation


Get a free account and join the conversation!
Become a GBA PRO!