26 September 2006
Green Building Technology. Technology that reduces impact on the earth. Includes
recyclability, reduction in carbon dioxide, ozone or other atmospheric pollutants, and
reduction of urban heat islands.
Gutter. A channel member installed at the eave of the roof for the purpose of carrying
water from the roof to the drains or down spouts.
Heat Seaming. The process of joining two or more thermoplastic films or sheets by
heating areas in contact with each other to the temperature at which fusion occurs. The
process is usually aided by a controlled pressure. In dielectric seaming, the heat is
induced within films by means of radio frequency waves.
Heat transfer. The transmission of thermal energy from a location of higher
temperature to a location of lower temperature. This can occur by conduction,
Humidity. The amount of moisture contained in the atmosphere. Generally expressed
percent relative humidity. (The ratio of the vapor pressure to the saturation pressure for
given conditions times 100.)
Hydrocarbons. An organic chemical compound containing mainly the elements carbon
and hydrogen. Aliphatic hydrocarbons are straight chain compounds of carbon and
hydrogen. Aromatic hydrocarbons are carbon-hydrogen compounds based on the cyclic
or benzene ring. They may be gaseous (CH4, ethylene, butadiene), liquid (hexene,
benzene), or solid (Natural rubber, napthalene, cispolybutadiene).
Inorganic (adj.). Comprising matter other than hydrocarbons and their derivatives, or
matter not of plant or animal origin.
Insulation. See Thermal Insulation.
Internal Pressure. Pressure inside a building, a function of wind velocity, building
height, and number and location of openings.
A highly reactive chemical grouping composed
of a nitrogen atom bonded
to a carbon atom bonded to an oxygen atom: =N=C=O; a chemical compound, usually
organic, containing one or more isocyanate groups.
Isoboard. Abridgement of polyisocyanurate foam insulation board.
Lap. Dimension by which a felt covers an underlying felt in BUR membrane. "Edge" or
side lap indicates the transverse cover; "End" lap indicates the cover at the end of the
roll. These terms also apply to single-ply membranes.
Lapped joint. A joint made by placing one surface to be joined partly over another
surface and bonding the overlapping portions.