Glossary of Commercial Roofing Terms
Click on a letter, to view the terms below.
A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Deck: the structural surface to which the roofing or waterproofing system (including insulation) is applied.
Degradation: a deleterious change in the chemical structure, physical properties, or appearance of a material due to natural or artificial exposure.
Delamination: separation of the plies in a roof membrane system or separation of laminated layers of insulation.
Dew Point: the temperature at which water vapor starts to condense in cooling air at the existing atmospheric pressure and vapor content.
Drain: a device that allows for the flow of water from a roof area.
Dropback: a reduction in the softening point of bitumen that occurs when bitumen is heated in the absence of air. see Softening Point Drift.
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 see page from the edge of the membrane.
<<Previous -
