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definitions index
BUILT-UP ROOF
COVERING. Two
or more layers of felt cemented together and surfaced with
a cap sheet, mineral aggregate, smooth coating or similar
surfacing material.
INTERLAYMENT.
A layer of felt or
nonbituminous saturated felt not less than 18 inches (457
mm) wide, shingled between each course of a wood-shake roof
covering.
MECHANICAL
EQUIPMENT SCREEN. A
partially enclosed rooftop structure used to aesthetically
conceal heating, ventilating and air conditioning (HVAC) electrical
or mechanical equipment from view.
METAL ROOF
PANEL. An
interlocking metal sheet having a minimum installed weather
exposure of 3 square feet (0.279m2) per sheet.
METAL ROOF
SHINGLE. An
interlocking metal sheet having an installed weather exposure
less than 3 square feet (0.279m2) per sheet.
MODIFIED BITUMEN
ROOF COVERING. One
or more layers of polymer-modified asphalt sheets. The sheet
materials shall be fully adhered or mechanically attached
to the substrate or held in place with an approved ballast
layer.
PENTHOUSE.
An enclosed, unoccupied
structure above the roof of a building, other than a tank,
tower, spire, dome cupola or bulkhead, occupying not more
than one-third of the roof area.
POSITIVE ROOF
DRAINAGE. The
drainage condition in which consideration has been made for
all loading deflections of the roof deck, and additional slope
has been provided to ensure drainage of the roof within 48
hours of precipitation.
REROOFING.
The process of recovering
or replacing an existing roof covering. See “Roof
recover” and “Roof
replacement.”
ROOF ASSEMBLY.
A system designed
to provide weather protection and resistance to design loads.
The system consists of a roof covering and roof deck or a
single component serving as both the roof covering and the
roof deck. A roof assembly includes the roof deck, vapor retarder,
substrate or thermal barrier, insulation, vapor retarder and
roof covering.
ROOF COVERING.
The covering applied
to the roof deck for weather resistance, fire classification
or appearance.
ROOF COVERING
SYSTEM. See
“Roof assembly.”
ROOF DECK.
The flat or sloped
surface not including its supporting members or vertical supports.
ROOF RECOVER.
The process of installing
an additional roof covering over a prepared existing roof
covering without removing the existing roof covering.
ROOF REPAIR.
Reconstruction or
renewal of any part of an existing roof for the purposes of
its maintenance.
ROOF REPLACEMENT.
The process of removing
the existing roof covering, repairing any damaged substrate
and installing a new roof covering.
ROOF VENTILATION.
The natural or mechanical
process of supplying conditioned or unconditioned air to,
or removing such air from, attics, cathedral ceilings or other
enclosed spaces over which a roof assembly is installed.
ROOFTOP STRUCTURE.
An enclosed structure
on or above the roof of any part of a building.
SCUPPER.
An opening in a wall
or parapet that allows water to drain from a roof.
SINGLE-PLY
MEMBRANE. A
roofing membrane that is field applied using one layer of
membrane material (either homogeneous or composite) rather
than multiple layers.
UNDERLAYMENT.
One or more layers
of felt, sheathing paper, nonbituminous saturated felt or
other approved material over which a steep-slope roof covering
is applied.
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