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

Screened Porch Ceiling – Insulation Challenge

stuartd | Posted in General Questions on

Screened Porch Ceiling – Insulation Challenge
Climate Zone 6
Screened porch at corner of house: (not a 3 season room)
12′ W x 15′ L x 8′ H
Two sides are exterior walls and will have only screening and railings/pickets
1 story above grade
under footprint of pitched roof with conditioned attic
above a bedroom (porch floor is duradek)
ceiling material is OSB
light fixture in center of ceiling

How shall I insulate the ceiling of this screened porch? Already spent a ton on spray foam. Despite builder assurances, this section was ‘missed’ on original SPF contract (that’s another story).

Plan A: Spray foam floor of attic above porch – $$$ – only labor is spray foam installer, but probably fastest and easiest choice.

Plan B: WRB / membrane (Majvest or Intello) on ceiling of porch and some ?? on attic floor. (I’d rather not have fluffy stuff, as there is none anywhere) Except for a few details done for me, builder has not, and will probably never work with building science materials.

Plan C: ??


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. user-6623302 | | #1

    Is the space over the porch going to be used? If no, use a wall to close off the attic and insulate there. Second choice, use techniques for insulating garage ceilings.

    1. stuartd | | #2

      Thanks, the space is a conditioned attic, and will be used only for storage.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |