Sloped Ceilings Need Cathedral Ceiling Insulation
A sloped ceiling has very little depth for insulation, often just the width of the rafter. Older houses near Allandale and downtown frequently have thin batts or nothing at all behind the plaster. Without cathedral ceiling insulation, these rooms feel cold in winter, hot in summer, and the roof above them is often where ice forms first.
Three Ways To Do Cathedral Ceiling Insulation
When the ceiling is closed and the rafter bays are empty or thin, dense-pack insulation can be blown in through small holes and patched afterward. When the ceiling is open during a renovation, closed cell spray foam sprayed straight onto the roof sheathing packs the most R-value into a shallow rafter. When there is an attic above a flat section of ceiling, that section is insulated like any other attic insulation top-up.
We tell you which method fits your room, and why, on the free visit.
Air And Moisture Control With Cathedral Ceiling Insulation
In a sloped ceiling, warm air leaking through the drywall has a short trip to the cold roof boards. That is why cathedral ceiling insulation needs a good air barrier on the room side, and why spray foam is popular for these spaces. Where the roof is vented, a channel is kept open between the insulation and the roof boards.
Cathedral Ceiling Insulation Pricing
Expect cathedral ceiling insulation to land between $3.50 and $7.00 a square foot of ceiling, depending on the method and whether the ceiling is already open. The written quote explains the method and the finished R-value. The Ontario attic insulation rebate also has a cathedral ceiling level.