From my research it looks like the best option is to make the attic a conditioned nonvented space.
Converting attic to conditioned space.
The attic is fairly small at about 1 000 sqf total.
R 30 blown insulation at ceiling floor.
R 30 in ceiling attic floor assembly.
One way is by working within the home s existing footprint and converting the attic into living space.
Looking for a way to expand your home s square footage without building an entire new addition.
With full home additions costing 75 000 minimum and usually far higher many homeowners search for creative ways to increase living space without overly decreasing their bank account.
If the space above your head stands empty chances are good you can transform your blank attic canvas into an entertainment area play room craft room or man cave.
If you planned to leave the open cell foam exposed to the attic it would certainly.
Making the attic a conditioned space taking the building envelope to the roof is a good approach and will save energy another approach is to use radiant coated deck sheathing seal all ceiling attic penetrations and blow in r 60 insulation as it will cost less than spray foam and should give at least the same energy efficiency to the home.
However you do not describe the potential uses for that space and that gives me pause as to how to properly evaluate the risks of your options.
Your stated goal is to turn your attic into a non vented conditioned space.
Typically the conversion or.