For exterior trim, we'd all like to use clear verticalgrain,
all-heartwood western red cedar or redwood.
These materials have successfully protected homes
for centuries. They resist decay, remain stable, hold
paint well, and are a pleasure to work with. That's
why they and a few other solid wood species account
for 90% of the nonvinyl trim that builders install.
Unfortunately, the supply of quality solid wood has
been strained in the last few years, driving prices up
and making it hard to find the
"good stuff." As a result, builders
are exploring engineered trim
materials, including finger-jointed
wood, laminated veneer lumber
(LVL), hardboard, and fibercement
panels. These materials
hold great promise, but they have
distinct characteristics that