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Tabernacle (tin) A name given to a corrugated-iron clad church building. The word tabernacle is also used in Catholic churches for a chamber with a door, used for the Reservation of the Host.   Tanking The coating of a section of a wall with an impervious material to prevent water penetrating it.   Terne coated steel Steel coated with an alloy of tin and lead, used as a roofing material. Related Words  Lead; Steel Terra cotta Used of fired clay pieces with a fine red surface, made at a high temperature so that they are dense and impervious to water. In church buildings terra cotta ware would be most commonly used for roof ridging and finials. Related Words  Ridge, ridging Tiles Tiles are pieces of roofing material, regular in size and shape so as to allow a roof to be covered evenly and rapidly. Tiles may be made of fired clay or of concrete. Clay tiles may be flat (rosemary tiles), of an S-shaped section (pantiles), or of some special section. They are usually fixed on battens. Concrete tiles may be flat, and diamond-shaped, or profiled in some way, for example to resemble pantiles. Concrete tiles are heavier and less durable than clay tiles or slates. Related Words  Batten; Concrete; Rosemary tiles Toughened glass Glass treated to be resistant to impact. It is designed to break up into tiny fragments, rather than to splinter.   Tracery The pattern of stone, wood or iron strips used to subdivide a large window opening into smaller sections. Tracery is used to describe the pattern of major subdivisions of a window.   Transept A projection from the main body of a church. In a fully-developed Latin cross-plan church there are two transepts ('north and south') forming the arms of the cross. In some buildings intended to be cruciform the long nave was never built. In many post-Reformation churches the 'transepts' are projections built primarily to house side galleries.   Related Words  Cruciform; Nave Transom A cross-member in the subdivision of a window opening.   Truss A wooden or metal flat frame, usually made of triangular elements. In church building a series of trusses, with rafters and purlins, forms the supporting structure of the roof.   Related Words  Rafter Tympanum The masonry or brickwork inside a pediment, or the head of an arch, sometimes filled with sculpture. Related Words  Arch; Pediment