05/01/2022
Letās talk about SPRAY FOAM ATTICS;
To prevent moisture problems in a attic that has been spray foamed you need to think about temperature and dew point.
Leaving insulation in an attic floor after insulating the roofline with spray foam, the attic temperature will be cooler during the winter than if you removed the insulation.
Many spray foam the roofline to make attic more airtight and heat efficient. Doing this actually makes the attic a conditioned space, much like the rest of your house.
By conditioning the attic, the air in the attic combined with the air in the house now have the potential to create levels of humidity that are greater than the outdoors, as well as a vented attic.
š© SOLUTION
Removing any insulation in the attic floor will help solve this problem, but itās not the only solution.
Whether or not the insulation remains in the attic floor, spray foamed attics need to treated as conditioned spaces. The air in the attic needs to be addressed and the problem will go away.
Depending on the age of the insulation, but old insulation is often full of dust, debris, mouse droppings, bat guano and the remains of a dead rodents. Rodent bait and other scents create a potential odor problem from the LACK of VENTILATION!
ā ļø It is recommend to remove the old insulation, vacuum in between ceiling joists, cleaning up all rodent and bat guano.
So if you apply spray foam insulation on your roof deck:
š»Remove ALL insulation in between ceiling joists
šŗBe sure to install a whole-house ventilation and condition the air in the attic.
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