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Jan 23, 2013
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What is a Hot Roof?

Traditionally in the Midwest, homes are insulated with fiberglass or cellulose insulation.  However, a newer trend being seen in homes is the use of spray foam insulation, also known as hot roofing.  Just as the name implies, this type of insulation comes in spray cans. It’s a combination of resin and chemicals such as polyurethane & isocyanides.   As the insulation is sprayed, it expands and fills up the entire area it is being applied to.  The term “hot roof” comes in because the spray foam insulation is being affixed directly to the roof sheathing which removes the need for ventilation.

Hot Roof vs. Cold Roof

Attics typically have an insulated floor and have ventilation.  A cold roof, often referred to as a vented roof, allows air from the outside to come in through the soffits, and exit through the top of the roof which creates a cold attic during the winter months.  This method is intended to deter ice dams by keeping the roof cooler. When your attic is filled with spray foam insulation to create a hot roof, your attic’s temperature rises because the thermal envelope is shifted to the underside of your roof because ventilation is not present.

hot roof

Warranties on Hot Roofs:

Industry studies show that shingle temperature is only raised by a few degrees with a hot roof.  However, these few degrees can lower shingle lifespan by up to 10% and cause shingles to fade.  GAF, North America’s largest manufacturer of residential and commercial roofing, offers a “Golden Pledge” warranty which covers roofing material and labor for 50 years.  This warranty is not pro-rated.  However, those with a hot roof are not eligible for GAF’s highest level of warranty because a hot roof does not have the insulation standards that their asphalt shingles were designed for.  Before moving forward with a hot roof, check with your roofing manufacturer to make sure that doing so will not void your roofing warranty.  Be sure to check with your city to see if they have restrictions on hot roofing before proceeding with your project.

Learn More About GAF’s 50-Year Roofing System:

Perks of a Hot Roof Insulation: The unit of measurement for hot roof insulation is called the “R-Value”. The R-value measures how well insulation is able to resist heat going through it. The bigger the R-value, the better it will insulate your home.  Hot roofs contain the highest R-Value because there are no chances for air to leak.  If the attic contains duct work, it won’t need to be insulated because there is no energy loss.  Hot roofing prevents energy loss and can lower your utility bills.

Browse Our Roofing Projects:

Roofing & Insulation Reviews:

"They were contracted to insulate the garage ceiling which they did in a two-step process with both foam and blown-in insulation. They then returned to put up new gutters facia and soffits in a two day process that was professional, neat , and used materials economically."

Stephen G.
MInneapolis, MN
April 28, 2022

"Excellent and efficient work. Thankful that the Lindus crew was accommodating to our needs as homeowners and for their communication throughout."

Christian
Bloomington, MN
April 19, 2022

"Please pass on that Randahl and crew did a wonderful job re-roofing our house yesterday. It looks just wonderful. Everybody worked very hard to complete it in just a day. Awesome."

Warren & Sue T.
Lindstrom, MN
April 12, 2022

“I want to thank and commend Andy Lindus and his crew for a fantastic job.  I recently had my attic completely foam insulated and had some new windows installed.  Everything turned out fantastic.  I am very pleased.  I do have to note that the foam insulation made an immediate difference in keeping my house nice and warm this winter which helps on the heating bills.  Thanks again!”

Rob L.
Cottage Grove, MN
March 19, 2022

"We highly recommend Lindus Construction. They showed up everyday and did quality work. Very professional, polite, and answered all of our questions and concerns. The work ethic we saw was superior. We’re very pleased with the insulation and venting project they just completed. They get the highest a 5+ rating from us."

Lee Ann S.
Maplewood, MN
February 4, 2022

"You replaced my roofing.  Everything went well."

Dennis F.
Little Canada, MN
January 14, 2022
75% Off Installation Labor on LeafGuard® Brand Gutters, GAF Asphalt Shingles, & Infinity® From Marvin Windows. We Are Also Offering A Complimentary Heat Map Analysis With Insulation Estimates Through August 2022.
Some restrictions may apply. Call for details.
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