Does GP offer a one-hour shaftwall for corridor ceilings?
Yes. The Series 622 one-hour shaftwall design can be used as a one-hour ceiling assembly. This one-hour rated assembly is a wall design and may not be acceptable as a one-hour rated corridor ceiling in some parts of the country. Ask your local building code official prior to construction. An alternative is to install the tested 2-hour horizontal shaftwall system series 623, 624, or 627, although only a one-hour fire rating is required. Series 622 uses a single layer of 5/8″ ToughRock Fireguard® in addition to DensGlass Ultra® Shaftliner, while the 2-hour design involves the use of three layers of 5/8″ Type X or Type C product. Q: How do we convince a building inspector who insists on an Underwriter’s Laboratory (UL) test reference, that a GP system complies to code even though it has been fire tested at a different test agency? A: Either ignorance or unjust biases cause some building inspectors to insist only on UL test references. Many of our fire-rated designs were tested at UL. But
