Seahawk Remodeling - Sealing the Attic Envelope
Seahawk Remodeling New Technology Building Science
Spray Foam Insulation in the Attic Floor (Non-Vented Attic Spaces)

In this application, considered the most effective, by most of the SPF industry, the foam is sprayed directly to the underside of the roof between the joists, down around the rim and into the soffit areas, on the gable wall ends, and effectively sealing off and insulating the entire attic space from any air infiltration.

By now you have probably heard of this procedure with terms like: "Hot Roof design", Unvented Attic, Conditioned Attic, or "The Insulated Envelope." We at Seahawk Remodeling use the term "Unvented Attic."
Click here to view the ICC Unvented Roof Complaince in PDF format. Click here to view the ICC Unvented Roof Complaince in PDF format.
Energy Savings
A vented attic situation will become approximately 130-140 degrees in the summer. There's no reason for your air-conditioning and vent-ductwork to have to work in that type of severe conditions. There is also opportunity for moisture to form due to condensation on these appliances.

By applying spray foam directly to the underside of the roof deck, it now insulates the attic space from the extreme heat that once radiated thorough the hot shingles sheathing and roof. The severe temperatures no longer exist in the attic. In short, the attic now becomes a passively "conditioned" space of the house that is just as comfortable as any other room in the home.

A roof system insulated with Premiere's Spray Foam reduces energy several ways. Energy loss from ducts located in the attic is essentially eliminated. The top of the building is much tighter resulting in less infiltration and exfiltration, so excess moisture isn't pulled into the attic. Infiltration through the ceiling is also reduced. In addition, the attic temperature is remarkably lower, which further reduces energy loads.
Conduction, Convection and Radiant Heat Transfer
Seahawk Remodeling - Insulating the Attic Envelope - Standard In a standard insulation system, ceiling insulation reduces the transfer of heat from the attic to the living space (in the summer). Attic temperatures can often approach 140°F during the day. Most of this heat enters the attic space through a multi-step process.

First, solar energy warms the shingles and sheathing. The hot sheathing then transfers heat to the rest of the attic through conduction, convection and radiant heat transfer. The 140°F temperature of the underside roof surface drives the heat transfer process.

Seahawk Remodeling - Insulating the Attic Envelope - Hot Roof




By having Seahawk Remodeling insulate the roof surface with spray foam, the surface temperature exposed to the attic (the temperature driving the heat transfer) is reduced by as much as 40°F.

Both conduction and convection heat transfer are proportional to a temperature difference, so that heat transfer will be reduced proportional to the drop in surface temperature.


The benefits of including the attic in the insulated space are:
Seahawk Remodeling Research PDF's
Learning the Difference between Open Cell and Closed Cell Spray Foam. Click here to view the Learning the Difference between Open Cell and Closed Cell Spray Foam in PDF format.

Spray-in-Place Polyurethane Foam Insulation Engineering Report. Click here to view the Spray-in-Place Polyurethane Foam Insulation Engineering Report in PDF format.