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Knee Walls

Knee walls and a flat ceiling are often built in attics to create useable living space.

1. Insulate new walls as outlined in Ceilings and Roofs and Exterior Walls.

  • Insulate attic from the outside of the knee wall to the eave as outlined in the The Attic.
  • Install approved vapor barrier/retarder on interior side wall and ceiling surfaces.
  • Ensure adequate ventilation.
  • Do not insulate the section of roof outside the new room.