Advertisement of hollow structural tile circa 1920.
Structural clay tile describes a category of burned-clay building materials used to construct roofing, walls, and flooring for structural and non-structural purposes, especially in fireproofing applications. Also called building tile, structural terra cotta, hollow tile, saltillo tile, and clay block, the material is an extruded clay shape with substantial depth that allows it to be laid in the same manner as other clay or concrete masonry. In North America it was chiefly used during the late 19th and early 20th centuries, reaching peak popularity at the turn of the century and declining around the 1950s. Structural clay tile grew in popularity in the end of the nineteenth-century because it could be constructed faster, was lighter, and required simpler flat falsework than earlier brick vaulting construction.[1]
Each unit is generally made of clay or terra-cotta with hollow cavities, or cells, inside it. The colors of terracotta transform from gray (raw, moist clay) to orange, red, yellow, and cream tones. This is due to an effect of the firing process which hardens the clay so it can be used for structural purposes.[2] The material is commonly used in floor arches, fireproofing, partition walls, and furring.[3] It continues to be used in Europe to build fire-resistant walls and partitions. In North America the material has largely been replaced by concrete masonry units.
^Friedman, Donald (2010). Historical Building Construction. New York: W. W. Norton & Company. pp. 108–109. ISBN 978-0-393-73268-9.
^"Terracotta Tile (The Complete Guide & Video) | Terracotta Floor Tiles Tips". Rustico Tile & Stone. 15 October 2020.
^Twentieth-century building materials : history and conservation. Jester, Thomas C.,, Getty Conservation Institute. Los Angeles, California. August 2014. ISBN 9781606063255. OCLC 878050864.{{cite book}}: CS1 maint: location missing publisher (link) CS1 maint: others (link)
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