| Edge Sheets |
felt strips
that are cut to widths narrower that the standard width
of the full felt roll. They are used to cover joints.
|
| Edge Stripping |
application of felt strips cut
to narrower widths than the normal width of the full
felt roll. |
| Edge Venting |
the practice
of providing regularly spaced protected openings along
a roof perimeter to relieve moisture vapor pressure.
. |
| EIP |
Ethylene Interpolymer |
| Elastomer |
a macromolecular material that
returns rapidly to its approximate initial dimensions
and shape after substantial deformation by a weak stress
and the subsequent release of that stress. |
| Elastomeric |
the term used to describe the
elastic, rubber like properties of a material. |
| Embedment |
(1) the process of pressing a
felt, aggregate, fabric, mat, or panel uniformly and
completely into hot bitumen or adhesive; (2) the process
of placing a material into another material so that
it becomes an integral part of the whole material. |
| Emulsion |
the intimate dispersion of an
organic material and water achieved by using a chemical
or clay emulsifying agent. |
| End Lap |
the distance of overlap where
one ply extends beyond the end of the immediately adjacent
ply. |
| Envelope |
a continuous felt fold formed
by wrapping and securing a portion of a base felt back
up and over the felt plies above it. The envelope is
intended to prevent bitumen seepage from the edge of
the membrane. |
| EPDM |
Ethylene
Propylene Diene Monomer (commonly referred to as
a "rubber roof") |
| Epoxy |
a class of synthetic, thermosetting
resins that produce tough, hard, chemical-resistant
coatings and adhesives. |
| Equilibrium Moisture Content (EMC) |
(1) the moisture content of material
stabilized at a given temperature and relative humidity,
expressed as percent moisture by weight; (2) the typical
moisture content of a material in any given geographical
area. |
| Equiviscous Temperature (EVT) |
the temperature at which bitumen
attains the proper viscosity for built up membrane
application. |
| Expansion Joint |
a structural separation between
two building elements designed to minimize the effect
of the stresses and movements of a building's components
and to prevent these stresses from splitting or ridging
the roof membrane. |
| Exposure |
(1)the transverse dimension of
a roofing element not overlapped by an adjacent element
in any roof system. The exposure of any ply in a membrane
may be computed by dividing the felt width minus 2
inches by the number of shingled plies; thus, the exposure
of a 36-inch-wide felt in a shingled, four-ply membrane
should be 8 1/2 inches; (2) the time during which a
portion of a roofing element is exposed to the weather. |
| Extrusion |
a manufacturing process which
consists of forcing batched and formulated material
through an orifice. |
