I had our attic spray-foamed in 2010. Our HVAC
contractor recently did a semiannual service. The
technician came down from the attic, where he was
checking the air handler, and he was wringing wet with
technician said we needed an energy consultant to check
the spray-foam job since leaks in the foam were likely
allowing hot, humid air into the attic.
consultant suggested removing all the batt insulation in
the ceiling and redoing the spray foam to totally
encapsulate the attic.
this good advice? Will removing all the batt insulation
affect the heating/air conditioning service in the
house? Will it now be trying to condition the air in the
We asked Harris Gross of Engineers for Home Inspection
in Cherry Hill, Pa., and Joe Ponessa of Rutgers
Cooperative Extension for their takes.
says: "Make sure all the vents are sealed. If open
vents are found, sealing them should resolve the matter.
If not, the second step would be to verify that the
spray foam insulation was properly installed.
said that installing batt insulation matters only if you
have a supply and return vets. It doesn’t make a
difference one way or the other if there are no vents.
no air vents are added, the attic will be a little
hotter or cooler than the outside air temperature, and
that will transmit to an extent down into the current
living space," he said. "So if no air-supply
vents are added, I would suggest keeping the batt
would not redo the spray foam unless it was improperly
says: "This sounds like the beginning of what is
called a ‘non-ventilated’ or ‘conditioned’
attic, defined as being part of the heated and cooled
space of the building.
is generally a good thing: It reduces summer ceiling
temperatures in the floors below (more so than attic
ventilation), reduces summertime moisture loading in the
attic, and provides a much better environment for any
heating, air conditioning and ductwork equipment located