Open Vs Closed Cell Attic Insulation

The cells are pressed together so air and mositure are unable to get inside the foam. R value is a critical part when comparing spray foam to other types of insulation. 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.

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However open cell and closed cell have their different uses.

Open vs closed cell attic insulation.

When it comes to insulating a home whether that s a roof insulation or floor insulation it is ideal to use icynene open cell spray foam. 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. Closed cell is denser better insulating. Both icynene open cell and closed cell spray insulation are effective insulators with both working as barriers for air leakage.

Architectural firms can specify both the building envelope for a total performance option. Closed cell foam is made up of cells that are as the name suggests completely closed. Closed cell spray foam exterior applications. Closed cell foam can also increase the racking.

Insulating value and strength 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. The insulation is blown into the wall or attic one layer 1 at a time. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area.

This makes the foam a softer more flexable material. Id go with closed cell. Open cell has an r value of 3 7 and closed cell has an r value of 6 5 based per inch of installed spray foam. Open cell foam is full of cells that aren t completely encapsulated.

In other words the cells are deliberatly left open.

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