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

Vapor Control With LP SmartSide Panels

atmanseer | Posted in General Questions on

I have a large shed which will be converted to a shop studio. It is sided with primed and painted thin (approx 3/8″) LP smartside  panels as siding and sheathing. I can’t get a straight answer as to if the panels are considered impermeable and I will have to plan for drying to the interior or if they will dry exteriorly. There is a permeable house wrap between the panels and the studs. Can I use rigid foam for insulation between the studs using “cut and cobble ” technique? what type of rigid foam is permeable enough to will allow drying to the interior. Or do I need to go with fiberglass batts or cellulose to allow drying in that direction?thanks

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.

Replies

  1. GBA Editor
    Kiley Jacques | | #1

    What is your climate zone?

    "Wood, vinyl, and composite siding aren’t reservoir claddings, making inward vapor drive less important, but a drainage space or material prevents moisture accumulation behind the siding and helps protect the wall, even if not required by code. Note that some sidings may not qualify as a vented cladding without a back-vented air space." --Take a look at the attached resource.

  2. atmanseer | | #2

    Thank you for your response and the article. I'm in Climate Zone 6. Don't want to create a double vapor barrier, so wondering if the smartsiding panels are impermeable enough to act in that way if combined with rigid air-sealed foam used in the stud cavities as insulation. If the panels are more permeable then I have less apprehension about using the foam.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |