Closed cell foam can also increase the racking strength of attic walls which.
Closed cell vs open cell in attic in southern climate.
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The cells are pressed together so air and mositure are unable to get inside the foam.
It is either open cell foam where the tiny cells of the foam are not completely closed.
Closed cell foam is made up of cells that are as the name suggests completely closed.
They are broken and air fills all of the open space inside the material.
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.
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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 issue there are two major factors to understand and consider.
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.
Architectural firms can specify both the building envelope for a total performance option.
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.
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.
In other words the cells are deliberatly left open.
Open cell should be at least 6 inches in depth and closed cell 4 inches or more of each depending on local code.
With the open cell vs.
Open cell foam is full of cells that aren t completely encapsulated.
Can be applied at very low temperatures as low as 5of.
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Closed cell foam has a higher r value per inch and is vapor impermeable.
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.
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Senior editor martin holladay replies.
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280dc uv protecting paint for foam.
This makes the foam a softer more flexable material.
