A little ingenuity can replace a crane when installing roof panels. This 4x16-foot panel is 4 1/2
inches thick and weighs in at about 250 pounds.
frame. A decade later, after much experimentation,
the stressed-skin panel has
become our preferred insulation
system.
Recipe for a onestep
shell: Plan
for minimal
waste, measure
and cut with
precision, and be
sure to seal 'em
tight.
A stressed-skin panel is nothing more
than a sandwich of a thick core material
bonded to two thin outer skins. The
structural principle is similar to that of
an I-beam; the outer skins serve as the
flanges of the beam, while the insulation
core performs the role of the I-beam
web.
The panels we now use have a
polyurethane core