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 vs closed cell attic insulation.
However open cell and closed cell have their different uses.
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.
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.
Open cell foam is full of cells that aren t completely encapsulated.
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.
Id go with closed cell.
Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me.
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.
Closed cell foam can also increase the racking.
The cells are pressed together so air and mositure are unable to get inside the foam.
The insulation is blown into the wall or attic one layer 1 at a time.
In other words the cells are deliberatly left open.
Architectural firms can specify both the building envelope for a total performance option.
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.
Closed cell spray foam exterior applications.
R value is a critical part when comparing spray foam to other types of insulation.