Spray foam is not a safe product because there are so many variables and you can't even get a UL listing because it's not manufactured in a controlled environment. 

 

2 chemicals have to be mixed precisely and applied at a certain temperature and thickness to ensure that it cures properly and doesn't off-gas. 

 

It is also hard to find qualified installers as the process presents obvious health risks to the installer.

 

Spray foam is very challenging to apply in an existing house as there are many tight spaces and if every area doesn't get completely sealed moisture can come in and not get out. 

 

This is a perfect environment for mold. 

The other issue is that it cooks the shingles and if you get a roof leak you won't know it until the entire roof can be compromised. 

 

(Check with your shingle manufacturer as the warranty may be voided by the application of spray foam)

 

 

Not a cheap fix as pulling off the plywood that is glued on the trusses is very challenging and expensive!

 

 

You may inquire with your homeowner's insurance to see if they will cover the replacement of a roof that can be damaged because of a leak going unnoticed due to spray foam.

 

 

Don't believe the lie that open cell will drip through and help you find the leaks. 

 

 

It holds the moisture like a sponge to the roof allowing it to migrates throughout the decking.

 

 

If safety and performance are your goals spray foam may not be the best choice for your family.

 

 

 

 

 

 

RESOURCES & EDUCATION

 

 How can something so toxic be considered green?

 

Why SprayFoam Fails?

 

Losing health

 

EPA Raises Health Concerns with Spray Foam Insulation

 

Is it a fire hazard?

 

Massachusetts Fires Tied to Spray Foam

 

Reason Foam Fails

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https://www.epa.gov/saferchoice/health-concerns-about-spray-polyurethane-foam