Definition of the term Algae
Microorganisms that may grow to colonies in damp environments, including certain rooftops. They can discolor shingles. Often described as "fungus."
Definition of the term Compression Fitting
Used to join or connect pipes and conduit by causing a ring to compress against the connecting tube when tightening with a wrench.
Definition of the term Fixture
In plumbing, the devices that provide a supply of water and/or its disposal, e.g. sinks, tubs, toilets.
Definition of the term Metal Edge
Brake metal or metal extrusions which are secured at the perimeter of the roof to form a weather-tight seal.
Definition of the term Roof Deck
See deck.
Definition of the term Valley
The internal angle formed by the junction of two sloping sides of a roof.
Definition of the term Alligatoring
A condition of paint or aged asphalt brought about by the loss of volatile oils and the oxidation caused by solar radiation. Causes a coarse checking pattern characterized by a…
Definition of the term Compression Gasket
A gasket designed to function under compression.
Definition of the term Flagstone (Flagging or Flags)
Flat stones, from 1 to 4 inches thick, used for rustic walks, steps, floors, and the like.
Definition of the term Metal Lath
Sheets of metal that are slit and drawn out to form openings. Used as a plaster base for walls and ceilings and as reinforcing over other forms of plaster base.