Foam has been around since the early 1940’s late 1930’s It has been used in various applications and today has a wide variety of uses. https://99restoration.com/foam/

3. Foam has been around since the early
1940’s late 1930’s It has been used in
various applications and today has a wide
variety of uses. Polyurethane Foam is one
of the most diverse Products that is used
in many applications of home building.
We use a 3LB Roofing foam that is denser
than the average insulation foam. There
have been many forms of foam
throughout the years, and it’s always
improving.

6. We have experimented with Different ways to
apply spray foam to flat roofing substrates. Tar
and gravel, Tpo, Epdm, and modified Bitumen
(BUR), but have found that if we apply foam
over another substrate that it leaves room for
error because the substrate can fail and cause
a leak. We only apply foam directly to the
wood decking this ensures a watertight bond
between the foam and the house The only way
for the roof to leak is for there to be a
noticeable crack in the foam leading down to a
cracking the decking. The advantage of foam is
it’s extremely easy to repair and see what
needs to be repaired.

10. Adding spray foam to any home is a rewarding
improvement to your property the added
insulation to the freedom from worry. Foam
will outlast any product on the market with the
least amount of maintenance. As long as the
foam is shielded from the uv rays of the sun
with a silicone coating it will be the last roof
you’ll ever install on your home. Spray
Polyurethane Foam (SPF) is regarded among
the longest lasting types of roofing systems.
Many SPF roofing systems have endured over
50 years with few signs of failing.

12. https://99restoration.com/foam