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Spray Foam Cathedral Attics

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Offering years of industry led spray foam knowledge. 

Insulation That Performs Where Heat Escapes Most

Cathedral attics are one of the most challenging areas to insulate properly. Sloped ceilings, tight cavities, and airflow issues make traditional insulation unreliable. Spray foam insulation creates a continuous air and thermal seal that helps keep your home comfortable year-round.

In cathedralized attic spaces, spray foam insulation is applied to the underside of the roof deck, while the ceiling remains flat. This method is standard for all spray foam applications in residential construction, regardless of whether the ceiling is flat or sloped.

By keeping the spray foam against the roof deck, the airspace within remains warm and conditioned. This design allows the flat ceiling to function similarly to a suspended ceiling in a basement—primarily serving as a finish for the interior and accommodating lighting, speakers, TVs, or bulkheads without compromising the seal and insulation stability of the building envelope.

This approach not only offers architectural flexibility for intricate designs but also ensures superior insulation stability and energy efficiency, providing long-term comfort and cost savings for homeowners.

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Our products and services are backed by a 2-year warranty guarantee.

What to Expect

We assess your attic structure, explain the best approach, and install spray foam safely and to Canadian building code — with clear communication every step of the way.

Why Spray Foam Works for Cathedral Attics

Spray foam is especially effective in cathedral ceilings where space is limited and performance matters most.

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Seals air leaks that cause heat loss and drafts

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Helps prevent condensation and moisture issues

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Maintains consistent indoor temperatures

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Doesn’t sag or shift over time

March 16, 2021

Cathedral Ceilings, Attics & Roofs with Spray Foam Insulation | 1 of 4

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