GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X 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

  • |
  • |
  • |
  • |