MIL-HDBK-1001/SA
Delamination. Separation of felt plies in a built-up membrane or separation of previously factory-laminated insulation boards.
Dew Point. Temperature at which condensation of water vapor in a space begins for a given state of humidity and pressure as the vapor temperature is reduced; the temperature corresponding to saturation (100% relative humidity) for a given absolute humidity at constant pressure.
DFT. Dry film thickness, used as a measure of liquid-applied coatings.
Double pour. A doubling of the flood-coat, graveling-in operation, to provide additional waterproofing integrity to the membrane (done once, loose aggregate removed and done again).
Edge stripping. Application of narrow felt strips to cover a joint between flashing and built-up membrane.
Elastomer. A macromolecular material that rapidly regains its original shape after release of a light deforming stress.
Elastomeric. Having elastic properties, capable of expanding or contracting with the surfaces to which the material is applied without rupturing.
Emulsion. An intimate mixture of bitumen and water, with uniform dispersion of the bitumen globules achieved through a chemical or clay emulsifying agent.
Envelope. The continuous edge formed by folding an edge base felt over the plies above, securing it to the top felt. The envelope thus prevents bitumen seepage through the exposed edge joints of the laminated, built-up roofing membrane.
Equilibrium moisture content. The moisture content of a material at a given temperature and relative humidity, expressed as
percent moisture by weight.
Equiviscous temperature (EVT). The temperature at which bitumen has the viscosity of 12S centistokes for hot mopping.
Ethylene propylene diene monomer (EPDM). A thermosetting, synthetic rubber used in single-ply elastomeric sheet roof membranes.
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