Closed Cell Vs Open Cell In Attic In Southern Climate

In unvented roof assemblies open cell foam has been associated with damp roof sheathing and sheathing rot so closed cell foam is usually preferred for this application.

Closed cell vs open cell in attic in southern climate.

Closed cell foam has a higher r value per inch and is vapor impermeable. If you do not use the attic for a habitable purpose you might want to keep your thermal barrier on the floor of the attic. With the open cell vs. Closed cell foam can also increase the racking strength of attic walls which.

It also will perform better below or above grade. Fire rated e84 kit 605 sf coverage. In other words the cells are deliberatly left open. It is either open cell foam where the tiny cells of the foam are not completely closed.

Architectural firms can specify both the building envelope for a total performance option. Closed cell spray foam exterior applications. 280dc uv protecting paint for foam. Can be applied at very low temperatures as low as 5of.

Open cell foam is full of cells that aren t completely encapsulated. This makes the foam a softer more flexable material. Kit 105 sf coverage. When applied on the interior open cell spray insulation provides performance advantages that differ from those of closed cell spray foam used on the exterior.

Cavity fill slow rise. They are broken and air fills all of the open space inside the material. Open cell should be at least 6 inches in depth and closed cell 4 inches or more of each depending on local code. Quick cure best seller kit 605 sf coverage best seller kit 205 sf coverage.

Open cell is a lower cost alternative for basements in cold climates closed cell is preferable in parts of your home that are vulnerable to flooding hot and humid climates zones 1 thru 4 roof attic exterior walls. Senior editor martin holladay replies. A spray insulation is referred to open cell or closed cell because of the difference between the small bubbles cells that make up the foam. The cells are pressed together so air and mositure are unable to get inside the foam.

The first is the nature of the foam. Kit 60 sf coverage. Kit 43 cubic ft. Closed cell issue there are two major factors to understand and consider.

Kit 340 sf coverage.