Closed Cell Vs Open Cell In Attic In Southern Climate

The cells are pressed together so air and mositure are unable to get inside the foam.

Closed cell vs open cell in attic in southern climate.

Closed cell foam is made up of cells that are as the name suggests completely closed. Closed cell foam has a higher r value per inch and is vapor impermeable. With the open cell vs. 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.

This makes the foam a softer more flexable material. Kit 340 sf coverage. Open cell foam is full of cells that aren t completely encapsulated. It is either open cell foam where the tiny cells of the foam are not completely closed.

Can be applied at very low temperatures as low as 5of. Cavity fill slow rise. Closed cell foam can also increase the racking strength of attic walls which. They are broken and air fills all of the open space inside the material.

280dc uv protecting paint for foam. Open cell should be at least 6 inches in depth and closed cell 4 inches or more of each depending on local code. 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. Open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch.

Quick cure best seller kit 605 sf coverage best seller kit 205 sf coverage. Closed cell spray foam exterior applications. Kit 105 sf coverage. Kit 60 sf coverage.

Fire rated e84 kit 605 sf coverage. Senior editor martin holladay replies. Closed cell issue there are two major factors to understand and consider. 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.

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. Kit 43 cubic ft. Architectural firms can specify both the building envelope for a total performance option. Kit 205 sf coverage.

In other words the cells are deliberatly left open.