attic/wall insulation question
According to Energy Codes, warm, humid locations like Alabama require no vapor retarders in walls or ceilings, or when they are used, will be placed on the unheated side of wall and ceiling assemblies.
Vented attics also require no vapor retarders.
Vapor retarders are also usually not required when using blown cellulose. Check your manufacturer's installation instructions.
For the right answer for your location, contact your building code officials.
Last edited by manhattan42; 07-11-2006 at 08:02 AM.