Frequently Asked Questions
Here are some common questions about Spray Foam Insulation. If you don't get the answer you need please give Porter's Spray Foam Insulation a call and we'll be happy to answer all of your questions!
Q: Why is Spray Foam better than
fiberglass blow in or batt insulation in my attic?
A: Fiberglass insulation (blow in or batt) allows hot attic air to leak
into your house through the ceiling. This is called convection.
Spray Foam insulation is sprayed onto the inside of the roof plywood and
seals the attic tight not allowing the hot air to enter or build up in
the attic space. This prevents the hot air from leaking in through
the ceiling or around lights in the ceiling. Also, your A/C
ductwork is not exposed to hot attic air and condensation problems.
Q: How does Spray foam affect my
Air Conditioner?
A: With Spray Foam, your A/C ductwork(typical duct R-value = 6) is not
exposed to hot attic air and condensation, also the house is sealed
tight not allowing hot air to enter, (hot air can blow through typical
fiberglass insulation) You can reduce the size of your A/C or even
the number of A/C units in larger homes. What you save with fewer
or smaller air conditioners can pay for the cost of Spray Foam
insulation!
Q: Do I need to vent my attic?
A: No, with Spray Foam insulation attics are designed without venting.
On existing homes we will seal attic vents. Traditional attic and
crawlspace venting allows hot humid outside air to saturate your attic
and insulation (Providing ideal conditions for mold & mildew).
Unvented Spray Foam attics keep Hot, Humid air outside sealing your
building envelope. This is not traditional, but most Architects &
Builders see the advantages and building codes have changed to delete
venting with Spray Foam.
Q: Why does it cost more?
A: Spray Foam costs less in the long run, but does cost more up front.
Energy savings and smaller A/C's will pay for the additional cost of
Spray Foam insulation.
Q: How much money can I save?
A: Expected energy bill savings are 30-50%.
Q: Can Spray Foam only be used in new
construction?
A: NO, spray foam can be installed in the attic of a new or existing
home or in the walls during a remodel.
Q: Why haven't I heard of this before?
A: Spray foam has been used since the 1950's and has improved to follow
all emissions regulations and meets building codes. Contractors
are steadily becoming aware of the tremendous benefits for savings and
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