Eliminating the Negatives Wooden I-Joists permit greater spans than solid dimension lumber and long framing members are available to builders, but additional components such as web stiffeners, squash blocks, backer blocks and blocking panels must be properly installed to handle floor load situations. And, cutting and drilling through I-Joists can only be safely done after consulting a chart which considers joist span, distance from bearing, size of opening, shape of opening and proximity to the next opening. And while the strength of wood is one of nature's most wonderful gifts, common defects in sawn lumber can turn into nightmares for framers. Most important, continual in-plant testing ensures that troublesome and even dangerous lumber defects are never shipped to a job site. The savings can be calculated by an energy-engineering consultant and guaranteed by an independent insurance company.
Boric acid is added to the cellulose material during production.
Boric acid is a widely used insecticide. It has been proven to kill insects, termites and eliminates nesting of rodents within insulation. Boric acid is a salt. It is used in shampoos and eye washes when burned. Eliminates mildew Fiberglass releases toxic vapors when burned.