Cathedral ceilings must provide space between the roof deck and home’s ceiling for adequate insulation and ventilation. This can be achieved through the use of truss joists, scissor truss framing, or sufficiently large rafters.

Do you need to leave an air gap for insulation?

Insulation is technically a solid with a lot of air in it therefore, it is NOT an air gap. You literally must have a VOID, nothing in the air gap except air itself. So if you are installing under a roof or in a wall, you must create an air gap.

Does a cathedral ceiling need to be insulated?

Cathedral ceilings are beautiful, but they must be properly insulated to keep ceiling temperatures closer to room temperatures. To do this, the cathedral ceiling must be built with space between the roof deck and your home’s ceiling for adequate insulation and ventilation.

How do you add insulation to a cathedral ceiling?

Quote from the video:
Quote from Youtube video: So again basic steps you cut an access strip in the drywall of the cathedral ceiling remove the existing insulation that's in there and then spray foam down each stud cavity to get your fill.

Do cathedral ceilings need to be vented?

Like all ceiling roof assemblies, cathedral ceilings need ventilation. Usually, this involves soffit venting between every roof rafter under the eaves of the home and an equal amount of ridge venting near the roof peak.

How much space should be between roof and insulation?


1 address the requirement for a minimum 1-inch clearance between the insulation and sheathing to provide proper airflow. Note that most building scientists will recommend at least 2 inches of clearance for best performance (i.e., more than the code minimum).

Should you touch roof insulation?

We’ve done some searching and have the answer for you. Attic insulation should not touch the roof. Although it can be tempting to over insulate, resist the urge. Too much insulation hinders airflow and can keep excess moisture from escaping, especially in attics.

What kind of insulation do you use for a cathedral ceiling?

In general, closed-cell foam is the best choice for unvented cathedral ceilings. It is also one of the most expensive, and most building inspectors will not allow it to be left uncovered (for fire-code reasons). Foil-faced iso-board can be cost-effective insulation for finished attics and cathedral ceilings.

What R-value do I need for cathedral ceiling?

High-performance batts are specially designed for the space limitations in common cathedral ceilings. They have R-values of either 30 or 38. R-30 high-performance batts are 8-1/4˝ to 8-1/2˝ thick as opposed to standard R-30 fiber glass insulation batts of 9-1/2˝ to 10˝ (thickness may vary by manufacturer).

Do you insulate a vaulted ceiling?

Often vaulted ceilings are not insulated correctly. For years, fiberglass batt insulation was the only way to insulate vaulted ceilings. Over time, fiberglass batts can slide out of place and compromise your home’s energy efficiency. When insulating a vaulted ceiling, R-value and moisture management must be addressed.

Do cathedral ceilings need baffles?

Most builders and designers feel that a lining material is not necessary in the airspace of a cathedral ceiling except at the eaves [to avoid wind-wash or moved insulation]. At the eaves a rigid baffle is recommended to keep the insulation in place and to keep wind out of the insulation.

How do you insulate cathedral ceilings without ridge vents?

In cases where there is no under-roof venting system (no soffit intake vents, no ridge vents), a “hot roof” design is followed: the roof cavity between rafters can be filled with insulation, followed by installation of a perfect vapor barrier, followed by finish surface of drywall or whatever else.

Do cathedral ceilings have an attic?

A cathedral ceiling is considered a compact, or “warm,” roof assembly, which means each roof system component is in direct contact with the preceding component; therefore, there is no attic space between the ceiling and roof deck.

How much insulation do you need in a vaulted ceiling?

General principles. R-value minimums. In Climate Zones 4, 5, 6, 7, and 8, most prescriptive building codes require ceiling insulation to have a minimum R-value of R-49. In Zones 2 and 3, the minimum requirement is R-38, while in Zone 1, it’s R-30.

How do you frame a cathedral roof?

Quote from the video:
Quote from Youtube video: The rafters hang over the wall creating an overhang. The gutter board has attached the ends of the rafters. So that the trim and eventually the gutter can be installed.

Are cathedral ceilings outdated?

Are cathedral ceilings outdated? An alternative to a conventional flat ceilings, cathedral ceilings are far from outdated. However, you will find that there are polarizing opinions on vaulted or cathedral ceilings, so ultimately you must make sure you really like the raised ceiling style.

What is the difference between a vaulted and cathedral ceiling?

Vaulted vs.

While a cathedral ceiling has equal sloping sides that are parallel to the actual pitch of the roof, a vaulted ceiling does not follow the roof’s pitch, with more styles to choose from.

Are cathedral ceilings expensive?

While the end cost is heavily dependent on where you build and the unique design of your home, vaulted ceilings do cost more to build than the usual shorter ceilings. You’ll need a plan to mitigate higher heating and cooling costs. The simple truth is that vaulted ceilings make a room more expensive to heat.