Skip to main content

View Diary: Home-made self-sufficiency in West Virginia town offers a solar model adaptable nationwide (148 comments)

Comment Preferences

  •  Do yorself a favor and put a radiant foil barrier (0+ / 0-)

    down on top of the insulation stack, rather than on the inner surface of the roof structure.  Consider all of the year round operating conditions and the fact the attic air is vented to outside.

    Of course if you are building new or installing a new roof, metal is a fine choice, for various reasons.  But in a vented attic the barrier belongs at the top of the ceiling stack.

    I don't like appeal to authority but you linked us to metal roof marketing material.  I am a engineer and systems architect.  I've built thermal performance models for various structures and crawled around new construction installing sensors for validation.

    Radiative, conductive and convective transfer all differ depending on materials and structure.  Sub-optimizing by lowering the temperature of the inner roof structure in a vented space is fine if you want to spend your own money on it.  I'll spend mine in other ways.

    Where are we, now that we need us most?

    by Frank Knarf on Wed Feb 29, 2012 at 12:17:04 PM PST

    [ Parent ]

Subscribe or Donate to support Daily Kos.

  • Recommended (152)
  • Community (59)
  • Baltimore (38)
  • Civil Rights (37)
  • Bernie Sanders (33)
  • Culture (29)
  • Elections (29)
  • Economy (28)
  • Law (25)
  • Texas (23)
  • 2016 (21)
  • Rescued (21)
  • Environment (20)
  • Labor (19)
  • Education (18)
  • Hillary Clinton (18)
  • Racism (17)
  • Politics (17)
  • Media (17)
  • Freddie Gray (17)
  • Click here for the mobile view of the site