When pressure treated wood was developed in the 1960s it became possible for wood to be used in foundation walls without being prohibitively vulnerable to damage from insects.
Permanent wood foundation lumber vs pressure treated.
A pwf consists of a stud wall and footing substructure constructed of approved preservative treated plywood and lumber which supports an above grade superstructure.
And it provides builders and architects with detailed construction tips for a variety of building styles including both crawl space and full basement foundations.
A pwf system consists of load bearing wall systems framed with pressure treated lumber and sheathed with pressure treated plywood.
Of permanent wood foundations.
But wood foundations may not last as long as a concrete or concrete block foundation.
Foundation grade wood used in foundations is treated by steam impregnating it with a chemical called cca chromated copper arsenate at a concentration of at least 6 lbs.
The permanent wood foundation pwf is an innovative building system that saves builders time and creates comfortable living areas that enhance a home s value.
Of chemical per cubic foot of wood so that the chemical penetrates deep into the core of the wood.
While traditional basement walls are made from masonry materials such as concrete or stone inspectors should be prepared to encounter permanent wood foundations pwfs.