Closed Cell Or Open Cell Attic
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Id go with closed cell.
Closed cell or open cell attic. The higher the density the foam the heavier or stronger it becomes. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. Roofing applications typically use a 2 8 to 3 0 lb cu. Closed cell foam has a higher r value per inch and is vapor impermeable.
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. In other words the cells are deliberatly left open. 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. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area.
Senior editor martin holladay replies. The cells are pressed together so air and mositure are unable to get inside the foam. To support traffic and loads better. Most insulation contractors are recommending open because it s cheaper and also because if i go with closed cell and the roof leaks it will not penetrate the insulation and could remain stuck between the sheathing and the insulation and could rot the wood and or travel to a more hidden spot of the roof or attic causing worse problems that are harder to notice than if the roof leaked and water penetrated through the open cell which i would be able to see and fix if necessary.
Closed cell foam for insulation applications range in density from 1 7 lb cu. On may 26 2018. It also will perform better below or above grade. Open cell foams typically weigh in at 0 4 to 0 5 lb cu.
Closed cell foam is made up of cells that are as the name suggests completely closed. Closed cell is denser better insulating. 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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