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| Eave | A roof edge that extends out past the exterior wall line. |
| Eaves-Trough | Another name for Gutter. |
| ECH | Polyepichlorohydrin. See also Epichlorohydrin. |
| Edge Stripping | Roofing material used to seal perimeter edge metal and the roof itself. |
| Edge Venting | The installation of vent material along a roof edge (e.g., Starter Vent) as part of a ventilation system. Edge vent material should be used in conjunction with other venting material (e.g., ridge vent) as it not intended for use by itself. |
| Elastomer | A material which, after being stretched, will return to its original shape. |
| Elastomeric | Properties of a material that will permit it to return to its original shape after being stretched. |
| Elastomeric Coating | A coating that can be stretched to twice its dimensions and that will return to original when tension is released. |
| Elongation | The ability of a material to be stretched or lengthened. |
| Embedment | In roofing, to uniformly press one material into another, such as aggregate into bitumen, roofing felt into bitumen, or granules into a coating. |
| Emulsion | Fine particles suspended in a liquid solution. See also Asphalt Emulsion and Bituminous Emulsion. |
| End Lap | The extension of one component of material past the end of an adjacent piece of material. |
| Envelope | A continuous seal for preventing bitumen from leaking down into or off a building. Is constructed by extending the base sheet or other non-porous ply of felt beyond the edge of the field plies. It is then turned back onto the top of the system and adhered. See also Bitumen-Stop. |
| EPDM | Ethylene Propylene Diene Monomer. |
| Epichlorohydrin (ECH) | A synthetic rubber material similar to EPDM with a stronger resistance to animal fats and oils than EPDM. |
| Epoxy | A type of synthetic, thermosetting resins that produce tough, hard, chemical-resistant coatings and adhesives. |
| Equipment Screen | A nonstructural wall or screen constructed around rooftop equipment such as HVAC units, curbs, etc. to hide the look of the equipment and make the structure more aesthetically pleasing. |
| Equiviscious Temperature (EVT) | The temperature at which a bitumen attains the proper viscosity for use in built-up roofing. There is usually a twenty-five degree Fahrenheit (25° F) variance permitted above and below the recommended EVT. The EVT is measured in application equipment just prior to application using a standard thermometer or it can be measured just after application using a laser thermometer. |
| Ethylene Propylene Diene Monomer (EPDM) | A thermoplastic rubber with high tear strength that can be cross-linked by both peroxides and sulfur. |
| EVT | Equiviscous Temperature |
| Exhaust Vent | A device used to vent air from the roof cavity with vents that are installed on or near the higher portions of the roof such as the ridge. |
| Expansion Cleat | A cleat designed to handle thermal movement of the metal roof panels. |
| Exposed-Nail Method | A method of installing roll roofing materials to where all nails/fasteners are visible and exposed to the elements. |
| Exposure | The portion of the membrane that is not overlapped by the succeeding ply or course. Or, the portion of the roofing material exposed to the weather after being installed. |
| Extrusion | The process of manufacturing and/or shaping a material by forcing it through a die. |
| Eyebrow | A small, shed roof protruding from the main roof or located on the side of a building below the level of the main roof. |