Vaulted Ceiling Insulation Air Gap

Insulated cathedral ceilings are a relatively recent phenomenon.

Vaulted ceiling insulation air gap.

Vented cathedral ceilings can be difficult to insulate well. In those days most builders stuffed cathedral ceiling rafter bays with fiberglass batts. Ventilation channels maintain an air gap between the insulation and the roof sheathing. The component that creates the gap is called a variety of things including a ventilation baffle a ventilation chute a ventilation channel or a product such as proper vent.

To keep fiberglass batts from blocking airflow rafter baffles should be. Cathedral ceilings are a feature in many homes that add to value to the house because the high ceiling tends to make rooms look larger. This type of roof assembly is designed so the air can flow up the soffit vent through an insulation baffle pass through the 1 5 gap between the insulation and roof sheathing then exit through a ridge vent. Cathedral ceilings built using 2 x 12 roof rafters allow enough space for the fiberglass batt insulation and a 1 5 gap for ventilation.

It provides an open airy look and feel to the room and they are often in demand among home buyers. In a vaulted ceiling however the only fresh air route lies between the insulation and the underside of the roof deck. These are brand new condominiums and we ve insulated according to the builders specification with fiberglass in the walls and we re going to be blowing the flat of the attic space with cellulose along with the rafter spaces in the cathedral ceiling.