GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Insulation Question

michael35 | Posted in Green Products and Materials on

I have 2 insulation companies. Quotes are similar and both are blown in borate treated cellulose. one uses 3 mil reinforced poly and the other uses the mesh webbing? what is the general feeling on these 2 methods? I have concern with breathability and was wondering what the Pro’s thought??

It is a small 20×30 structure that will also use 1.5 inch wood fiber insulation board on the walls as well as (2×6 walls and 2×10 rafters) blown in cellulose. I live in central Maine.

thanks Michael

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. Jon_R | | #1

    I wouldn't use poly if you ever use AC. Consider MemBrain on the interior to limit moisture entering the wall.

  2. ssnellings | | #2

    I suspect the 3mil reinforced poly isn't a great choice, but I would ask the contractor why he uses it instead of netting/webbing (I wonder how long it will take 'insulweb' to go the way of 'kleenex' and 'google' and become a generic trademark). You might learn something interesting about how that contractor performs work.

    The dense pack barriers I've seen used in order of frequency: insulweb, existing drywall (densepacking existing walls), and Pro Clima Intello.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |