One inch of plastic foam insulation can have the R-value of a four-inch thick piece of wood and it's lighter in weight as well.
(One inch of plastic foam insulation; can have; the R-value of a four-inch thick piece of wood) (it; 's as well; L:in weight)
One inch of plastic foam insulation it
can have 's as well
the R-value of a four-inch thick piece of wood
L:in weight