Cathedral Ceiling Insulation

Insulating a cathedral ceiling can be somewhat complicated and labor intensive if you are not familiar with the requirements of ventilation and thermal heat transfer. Depending on the construction method and materials used there are multiple options for insulating between the exterior roofing and the interior finish.

Here we will concentrate on the most common insulation method for a cathedral ceiling with a finished interior. If you have questions pertaining to a different application please call our sales team at 888-349-3645.

Reflective Bubble Insulation Installs Easily and Without Mess

As with any residential roof structure, there must be adequate ventilation provided from the eave of the building to the peak of the roof. This is important for proper natural airflow in order to eliminate the opportunity for condensation to form between the roofing materials. The easiest way to ensure a ventilation gap in a cathedral ceiling is to install insulation baffles between each ceiling joist. These are easily stapled to the roof sheeting and they create a 1" airspace that will run continuously from the eave to the ridge.

The next step is to insulate between the ceiling joists with a mass insulation such as fiberglass batting. The thickness of the fiberglass batt is determined by your ceiling joist size.

The final step is to install EcoFoil bubble insulation under the fiberglass batts to form a reflective vapor barrier which will also add R-Value to the entire assembly. You will want to make sure to tuck the EcoFoil reflective insulation between the ceiling joists at least 1" that provides optimal airspace for maximum reflectivity and R-Value. The air space is crucial for allowing radiant heat barrier to work properly.

Please view our installation sheet to better understand the steps and methods for this procedure. Click on the following link to download a printable Cathedral Ceiling Installation Sheet.