Batten: A strip of wood usually fastened to the structural deck for use in attaching a primary roof system such as tile; or a strip made of plastic, wood or metal bar which is used to fasten or hold the roof and/or base flashing in place.

Ceiling flux: The transfer or passage of solar heat from the roof through the ceiling into the interior.

Cut-up roof: Roof of unique shape differing from standard rectangular, curved or polygonal shapes.

Drip Edge: A metal piece bent at a 90-degree angle and installed around roof perimeters in order to protect the edge of the roofing system.

Eave closure: A material used to seal a roof edge that extends outward past the exterior wall line.

Eave course: The initial path of tiles installed along the eave line.

Field tile: An area of tile that covers a wall or floor.

Lap: The part of the roofing material that overlaps a section of adjacent material.

Rafter span chart: The maximum weight a rafter span can withstand.

Surface bubbling: The unwanted presence of small bubbles or rings on the surface of the tile.

Tile head lug: A fastener going across the underside of the tile but engaging over the battens.

Transition point: Area at which a portion of roofing ends, such as the edge or the top of a pitched room.

Trim tile: Specially cut tiles at the edges of the roof or surface.

Transverse break strength: The weight that can be withstood when applied across the length of the tile or other material.

Underlayment: A sheet of material installed between the roof deck and the roof covering to separate the roof covering from the roof deck, shed water and provide secondary weather protection.

Weep hole: A small hole allowing moisture gathered inside a building component to drain.