Stick building energy-efficient exterior
walls may be simplified with Nascor
Systems. This company makes interlocking
columns, panels, cripples, and
splines that can be assembled on site
to build pre-insulated, structural walls.
The components can be fit together to
accept any configuration of window
and door openings. They are then
nailed to 2x6 or 2x8 plates, and tipped
up like conventionally framed walls.
The 5-1/2- and 7-1/4-inch walls boast
ratings of R-20 and R-30, respectively.
The high R-values are reportedly due
to the thermal break provided by
sandwiching expanded polystyrene
(non-CFC-foamed) between flatframed
wood studs. Thermal bridging
occurs only at the top and bottom
plates. Using a specified sealant and
taping the joints between each component,
the manufacturer claims the
walls meet Canadian