Hot Roof Foam Insulation

The movement of air into indirect conditioning of an unvented attic is a slow gradual process that will not be noticeable by occupants and typically will not put any strain on the hvac system.

Hot roof foam insulation.

While some try to do this with fiberglass or cellulose their efforts are for naught and quite simply it is not allowed by any legitimate building code out there. Attics typically have an insulated floor and have ventilation. Unvented roof assemblies should be insulated either with air impermeable insulation rigid foam or spray polyurethane foam or with a combination of foam and air permeable insulation. Both papers basically came to the same conclusion.

Which is more expensive. The benefits of a conditioned attic. If you don t want to use sips or nailbase read this article tolearn the four basic approaches to insulating unvented roof assemblies. Open cell spray foam insulation is risky in all climate zones we already know open cell spray foam is risky in cold climates.

In this case you can learn a lot from foam tech s article vented vs. In the next section we will discuss the process of installing rigid foam board insulation in the roof deck. A hot roof will work great in any climate. How hot roofs differ from traditional roofs.

Depends on what you are factoring in all the insulation the coating a roof replacement if needed air sealing new or existing the hot roof will usually run more but it generally doesn t need any ongoing maintenance. Moisture from indoors can diffuse through the foam and find the cold roof sheathing where it accumulates and eventually rots the roof. A hot roof is one where there is no ventilation required as the insulation is directly attached to the roof sheathing. Basically the term cold roof refers to a traditional roof or vented roof while hot roof refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing.

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. This product is suitable for use in wall sheathing applications in new. But spray foam insulation used at the underside of the roof deck would need to be covered by a thermal barrier and intumescent coatings are commonly used.