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Insulating Cathedral Ceilings


Residential Solutions - Insulating Cathedral Ceilings
Energy Tip

The roof area can be the area of highest heat loss in buildings. In order to
conserve energy and to make buildings more comfortable, building codes
stipulate higher thermal resistances (R-values) for the roof area compared
to other building components.

On traditional cathedral ceilings where tongue and groove timber exposed
on the inside is used as an architectural feature, PlastiSpan insulation board
is ideal for both single and double layered applications.

Product Selections for this application:
PlastiSpan Plastispan HD DuroFoam



Review the Project Profile
Cathedral Ceiling Retrofit


Download the printable How-To
Instructions


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Follow these simple How-to steps to install your PlastiSpan insulation to have an insulated
cathedral ceiling.

1.Follow the building code.
Be sure to follow the building
code requirements applicable
in your region.


4. Fastening Layers of Insulation.Fasten second layer nailer to first layer nailer where they intersect. If the thermal resistance requires extra layers of insulation, add layers to the bottom of the system changing the nailer direction as required. The top nailer must always run from the bottomof the roof slope to the ridge of roof.
2.First Layer of Insulation.
Use nailers the same thickness as the first layer of insulation. Lay nailer, then insulation,
then nailer up the slope of the roof, all joints tightly butted. Fasten nailer to deck as work proceeds.

5.Finish. Nail roof sheathing to nailers taking care that air movement is unobstructed in ventilation space.
3. Second Layer of Insulation.
Lay second layer of insulation perpendicular to first layer.
Lay insulation with joints
tightly butted. Lay nailers
over insulation spaced to
support roof sheathing.
Second layer of nailers to achieve a minimum airspace
as determined by local
building code.

6. Roofing Cover. Install roof covering in accordance with manufacturer's instructions. Adequate ventilation must be insured using an acceptable method to the applicable building code and/or local regulations.