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A coating designed to prevent excessive absorption of finish coats into porous surfaces; a coating designed to prevent bleeding.

A rubber or neoprene washer, sometimes metal-backed, typically placed on a fastener to prevent water from migrating into and through the fastener hole.

(1) an edge or edging that differs from the main part of a fabric, granule-surfaced roll roofing or cap sheet, or other material; (2) a specially defined edge of the material (lined for demarcation), which is designed for some special purpose, such as overlapping or seaming.

To convert into a fixed or hardened state by chemical or physical action

The continuous longitudinal overlap of neighboring like materials.

A flashing of the bottom horizontal framing member of an opening, such as below a window or door.

The formation of a dense film on the surface of a liquid coating or mastic.

An opening in a roof that is glazed with a transparent or translucent material; used to admit diffused light to the space below.

A horizontal placement of concrete placed directly over a prepared earth substrate.

In SPF roofing, a small cut about 1 inch x ½ inch x ½ inch (25 mm x 13 mm x 13 mm), in a half-moon shape, used to measure coating film thickness.

In SPF roofing, the condition of the foam in which the surface shows spray undulation and is ideal for receiving a protective coating.

A roof membrane without mineral granule or aggregate surfacing.

A separate cap that snaps on over the vertical legs of some single standing or batten seam metal roof systems.

A series of devices attached to the roof in a pattern that attempts to hold snow in place, thus preventing sudden snow or ice slides from the roof; any device intended to prevent snow from sliding off a roof.

The live load due to the weight of snow on a roof; included in design calculations.

A sanitation pipe that penetrates the roof; used to vent plumbing fixtures

A lead/tin mixture that is melted and used to bond two pieces of some types of metals together.

The percentage by weight of the nonvolatile matter in an adhesive.

Any liquid used to dissolve another material.

Used to clean some single-ply roofing membranes prior to splicing, typically including heptane, hexane, white gasoline, and unleaded gasoline.

A process where a liquid solvent is used to chemically weld or join together two or more layers of certain membrane materials (usually thermoplastic).

Breaking off of plate-like pieces from a concrete, rock or masonry surface

asphalt complying with ASTM D 312, Type IV. (see Asphalt.)

A precise statement of a set of requirements to be satisfied by a material, product, system, or service.

A small masonry or polymeric block laid on the ground or lower roof below the opening of a downspout used to help prevent soil erosion and aggregate scour in front of the downspout.

Bonding or joining of overlapping materials. (see Seam.)

A metal plate placed underneath the joint between two pieces of metal.

Cured or uncured synthetic rubber tape used for splicing membrane materials.

a term used to describe two separate concrete slabs. The first is placed as a slab on grade or suspended slab, and covered with waterproofing and a drainage system. The second slab, also referred to as a topping slab, is then placed over the underlying slab and waterproofing.

See Mopping

A foamed plastic material, formed by spraying two components, PMDI (A component) and a resin (B component) to form a rigid, fully adhered, water-resistant, and insulating membrane.

A manufacturing process in which membranes are formed using a liquid compound that is spread onto a supporting reinforcement base layer and then dried to its finished condition

To remove the roofing aggregate and most of the bituminous top coating by scraping and chipping.

A nonwoven fabric made by mechanically bonding a dry-laid staple fabric by water jet, which entangles the individual fibers.

(1) a blade of leather or rubber set on a handle and used for spreading, pushing or wiping liquid material on, across or off a surface; (2) to smooth, wipe or treat with a squegee.

In metal roofing, a type of seam between adjacent sheets of material made by turning up the edges of two adjacent metal panels and then folding or interlocking them in a variety of ways.

The first layer of roofing, applied along a line adjacent to the downslope perimeter of the roof area. With steep-slope watershedding roof coverings, the starter course is covered by the first course.

(1) felt, ply sheet or membrane strips that are made or cut to widths narrower than the standard width of the roll and used to start the shingling pattern at an edge of the roof; (2) particular width sheets designed for perimeters in some mechanically attached and fully adhered single-ply systems.

Roll roofing or shingle strips applied along the downslope eave line before the first course of roofing and intended to fill spaces between cutouts and joints of the first course.

Any load, as on a structure, that does not change in magnitude or position with time.

A malleable alloy of iron and carbon produced by melting and refining pig iron and/or scrap steel; graded according to the carbon content (in a range from 0.02 to 1.7%); other elements, such as manganese and silicon, may be included to provide special properties.

Normally used as a horizontal supporting member between beams or other structural members, suitable for the support of some roof decks.

Asphalt complying with ASTM D 312, Type III. (see Asphalt.)

A category of roofing that generally include water-shedding types of roof coverings installed on slopes exceeding 3:12 (14 degrees).

Individual pieces of sheet metal material used to flash walls, around chimneys, dormers and such projections along the slope of a roof. Individual pieces are overlapped and stepped up the vertical surface.

In waterproofing, a non-penetrating fastener that is adhered to the waterproofing surface; typically used to retain insulation, drainage panels, prefabricated protection materials, etc., against the waterproofing to prevent sliding and displacement.

Small intermediate bends in a metal pan used to strengthen the panel.

see Wind clip.

A method of installing roofing rolls or sheet good materials parallel with the slope of the roof.

A long-shanked nail. Sometimes used for fastening over tile at hips and ridges.

The internal resistance of a material to a force, measured as a force per unit area.

A parallel series of small grooves, channels, or impressions typically within a metal roof panel used to help reduce the potential for oil-canning.

See mopping

Asphalt shingles that are manufactured in strips, approximately three times as long as they are wide.

(for metal) added protection of plastic films sometimes applied to coated or finished metals after the coil coating process. Applied after prime and top coats to resist damage to the finish prior to and during shipping, fabrication and installation.

Application of membrane stripping ply or plies.

Membrane flashing strips used for sealing or flashing metal flashing flanges into the roof membrane.

A metal roof panel designed to be applied over open framing rather than a continuous or closely spaced roof deck.

High molecular weight polymers having rubber-like properties, formed by the random copolymerization of styrene and butadiene monomers.

The surface upon which the roofing or waterproofing membrane is applied (e.g., in roofing, the structural deck or insulation).

An intentional depression around a roof drain or scupper that promotes drainage.

A metal pan used to create a depression around a drain or scupper to enhance drainage.

Loads that are added to existing loads. For example, a large stack of insulation boards placed on top of a structural steel deck.

The wearing away of a surface due to abrasion, dissolution or weathering.

The resulting surface from the final pass of SPF. The following terms are used to describe the different SPF surface textures: smooth orange peel, coarse orange peel, verge of popcorn, popcorn, treebark, and oversprayed.

The top layer or layers of a roof covering, specified or designed to protect the underlying roofing from direct exposure to the weather.

Contraction for “surface active agent;” a material that improves the emulsifying, dispersing, spreading, wetting or other surface-modifying properties of liquids.