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DEFINITIONS

[MP] STATIONARY FUEL CELL POWER PLANT. A [MP] SUMP. A tank or pit that receives sewage or waste,
self-contained package or factory-matched packages that located below the normal grade of the gravity system and that
constitute an automatically-operated assembly of integrated must be emptied by mechanical means.
systems for generating useful electrical energy and recover- [MP] SUMP PUMP. A pump installed to empty a sump.
able thermal energy that is permanently connected and fixed These pumps are used for removing storm water only. The
in place. pump is selected for the specific head and volume of the load
[MP] STORM SEWER, DRAIN. A pipe used for convey- and is usually operated by level controllers.
ing rainwater, surface water, subsurface water and similar liq-
uid waste. [RB] SUNROOM. A one-story structure attached to a dwell-
ing with a glazing area in excess of 40 percent of the gross
[RB] STORY. That portion of a building included between area of the structure’s exterior walls and roof.
the upper surface of a floor and the upper surface of the floor For the definition applicable in Chapter 11, see Section
or roof next above. N1101.6.
[RB] STORY ABOVE GRADE PLANE. Any story having [MP] SUPPLY AIR. Air delivered to a conditioned space
its finished floor surface entirely above grade plane, or in through ducts or plenums from the heat exchanger of a heat-
which the finished surface of the floor next above is either of ing, cooling or ventilating system.
the following:
[MP] SUPPORTS. Devices for supporting, hanging and
1. More than 6 feet (1829 mm) above grade plane. securing pipes, fixtures and equipment.
2. More than 12 feet (3658 mm) above the finished [MP] SWEEP. A drainage fitting designed to provide a
ground level at any point. change in direction of a drain pipe of less than the angle spec-
[RB] STRUCTURAL COMPOSITE LUMBER. Structural ified by the amount necessary to establish the desired slope of
members manufactured using wood elements bonded the line. Sweeps provide a longer turning radius than bends
together with exterior adhesives. and a less turbulent flow pattern (see “Bend” and “Elbow”).
Examples of structural composite lumber are: [MP] TEMPERATURE- AND PRESSURE-RELIEF (T
AND P) VALVE. A combination relief valve designed to
Laminated strand lumber (LSL). A composite of wood function as both a temperature-relief and pressure-relief
strand elements with wood fibers primarily oriented along valve.
the length of the member, where the least dimension of the
wood strand elements is 0.10 inch (2.54 mm) or less and [MP] TEMPERATURE-RELIEF VALVE. A temperature-
their average lengths are not less than 150 times the least actuated valve designed to discharge automatically at the
dimension of the wood strand elements. temperature at which it is set.
[RB] TERMITE-RESISTANT MATERIAL. Pressure-pre-
Laminated veneer lumber (LVL). A composite of wood
veneer elements with wood fibers primarily oriented along servative-treated wood in accordance with the AWPA stan-
the length of the member, where the veneer element thick- dards in Section R317.1, naturally durable termite-resistant
nesses are 0.25 inch (6.4 mm) or less. wood, steel, concrete, masonry or other approved material.
[RE] THERMAL ISOLATION. For the definition applica-
Oriented strand lumber (OSL). A composite of wood ble in Chapter 11, see Section N1101.6.
strand elements with wood fibers primarily oriented along
the length of the member, where the least dimension of the [RE] THERMAL RESISTANCE, R-VALUE. See “R-
wood strand elements is 0.10 inch (2.54 mm) or less and value.”
their average lengths are not less than 75 times and less [RE] THERMAL TRANSMITTANCE, U-FACTOR. See
than 150 times the least dimension of the wood strand ele- “U-factor.”
ments.
[RE] THERMOSTAT. For the definition applicable in
Parallel strand lumber (PSL). A composite of wood Chapter 11, see Section N1101.6.
strand elements with wood fibers primarily oriented along
the length of the member, where the least dimension of the [MP] THIRD-PARTY CERTIFICATION AGENCY. An
wood strand elements is 0.25 inch (6.4 mm) or less and approved agency operating a product or material certification
their average lengths are not less than 300 times the least system that incorporates initial product testing, assessment
dimension of the wood strand elements. and surveillance of a manufacturer’s quality control system.
[MP] THIRD-PARTY CERTIFIED. Certification obtained
[RB] STRUCTURAL INSULATED PANEL (SIP). A
structural sandwich panel that consists of a lightweight foam by the manufacturer indicating that the function and perfor-
plastic core securely laminated between two thin, rigid wood mance characteristics of a product or material have been
structural panel facings. determined by testing and ongoing surveillance by an
approved third-party certification agency. Assertion of certi-
[RB] STRUCTURE. That which is built or constructed. fication is in the form of identification in accordance with the
requirements of the third-party certification agency.
[RB] SUBSOIL DRAIN. A drain that collects subsurface
water or seepage water and conveys such water to a place of [RB] TOWNHOUSE. A single-family dwelling unit con-
disposal. structed in a group of three or more attached units in which

2018 INTERNATIONAL RESIDENTIAL CODE ® 25
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