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Fireproof vaults to protect important paper documents are usually built using concrete or masonry blocks as the primary building material. [citation needed] In the event of a fire, the chemically-bound water within the concrete or masonry blocks is forced into the vault chamber as steam, which soaks the paper documents to keep them from igniting.
An example of a typical NATCO hollow clay tile as advertised in their 1910 catalogue. "The visible points of superiority, as compared with similar tile of different makes, are the deep dovetail scoring for the better bonding of stucco or plaster, the absence of imperfections and the better general symmetry due to the more accurate machining by this company's unequaled equipment.
Fire-retardant materials are designed to burn slowly.. Fire-retardant materials should not be confused with fire-resistant materials. A fire resistant material is one which is designed to resist burning and withstand heat.
A gypsum block is made of gypsum plaster and water. The manufacturing process [1] is automated at production plants where raw gypsum (CaSO 4 ·2H 2 O) is ground and dried, then heated to remove three-quarters of the bound water and thus transformed into calcium sulfate hemihydrate (CaSO 4 ·½H 2 O), also known as gypsum plaster, stucco, calcined gypsum or plaster of Paris.
The base layer should be 6" deep for walkways, or 12" deep for driveways. [10] The base material should either be 3/4" crushed stone (to allow water to drain through it) for a 1/4" crushed stone bedding, or 3/4" minus crushed stone (to prevent sand from sinking through it) for a concrete sand bedding. The base should be compacted every 6".
The Homasote base reduces the incidence of impact injuries such as shin splints caused by dancing on the concrete floor. Homasote is used in theatrical sets as a noise deadening layer for stage platforms consisting of a 3 ⁄ 4 -inch (19 mm) plywood sublayer, a 1 ⁄ 2 -inch (13 mm) Homasote layer, and a 1 ⁄ 4 -inch (6 mm) Masonite top layer.