| Rigid insulation
is generally purchased in 2’ x 8’ or 4’ x 8’
sheets, ranging in thickness from ½” to 2”, in
½” increments. The Expanded polystyrene
(white, not pictured here) is similar to the old surfboards and commonly
used in packing. Expanded polystyrene tends to be the most economical
insulation per volume yet has a lower R-value then Extruded polystyrene
(see below). Typical usage for the Expanded polystyrene is under poured
slabs of concrete in a heated space.
Extruded polystyrene (blue or pink) has a higher
R-value than the expanded, is more durable, and less porous.
Foil faced polyisocyanurate has the highest R-value
per inch, reflects radiant energy, and is the most effective of
these three rigid insulations In a recent renovation project we
covered the entire existing roof with 1½” foil faced
rigid polyisocyanurate, gaining greater efficiency in the home at
a economical price (installed). Installation of rigid insulation
with tapes and caulks makes an effective air-barrier that can be
used during new construction or renovation.
These are just a few ways rigid insulation can be effective. We
are consistently employing new proven practices with the many uses
and locations rigid insulation can be utilized. |
