||07-09-2012 07:28 AM
cathedral ceiling insulation
A serious situation with my house is heat transmission down thru the uninsulated ceiling on the top floor which is now inhabited. The ceiling is cathedral, probably 6" rafters. The rafter cavity has soffit vents and a ridge vent. The inner layer is old style plaster (on lath) which transfers heat down from the rafter cavities. In the current heat wave temperatures make the room unsafe. Here's a concept. Consider something like foam boards or quilted aluminum rolls currently available. Question: could such material (+_) be attached to the underside of the ceiling to block heat? (from the hip wall up) Question: if so, what are the possibilities of finding a 'finished' (like wallpaper) surface facing the living space? Question: is it necessary to apply a skim plaster coat or retardant paint over the product? The concept is attractive, especially given the impossible alternatives: the interior ceiling cannot be removed; the current height of the room barely allows usage by normal people.