Absorption: the capacity of a material to approve within its body quantities of gases or fluid, such as dampness.
Accelerated Weathering: the procedure in which products are subjected to a controlled setting where various direct exposures such as warmth, water, condensation, or light are altered to multiply their effects, consequently accelerating the weathering process. The product's physical residential properties are measured after this procedure and also contrasted to the initial buildings of the unexposed material, or to the residential properties of the product that has actually been exposed to natural weathering.
Adhere: to cause two surface areas to be held with each other by adhesion, normally with asphalt or roofing concretes in built-up roofing and also with contact cements in some single-ply membranes.
Aggregate: rock, rock, crushed stone, smashed slag, water-worn crushed rock or marble chips utilized for appearing and/or ballasting a roof system.
Aging: the result on products that are revealed to an environment for an interval of time.
Alligatoring: the cracking of the surfacing bitumen on a built-up roof, producing a pattern of cracks comparable to an alligator's conceal; the fractures may or may not extend through the appearing asphalt.
Light weight aluminum: a non-rusting metal occasionally utilized for steel roofing as well as flashing.
Ambient Temperature: the temperature level of the air; air temperature level.
Application Rate: the quantity (mass, volume, or density) of product applied per unit area.
Apron Flashing: a term used for a blinking located at the juncture of the top of the sloped roof and an upright wall surface or steeper-sloped roof.
Architectural Tile: shingle that gives a dimensional appearance.
Asphalt: a dark brownish or black substance discovered in a natural state or, more commonly, left as a residue after evaporating or otherwise refining crude oil or petroleum.
Asphalt Solution: a mixture of asphalt particles and an emulsifying representative such as bentonite clay as well as water. These components are integrated by using a chemical or a clay emulsifying representative as well as blending or mixing machinery.
Asphalt Felt: an asphalt-saturated and/or an asphalt-coated really felt. (See Felt.).
Asphalt Roof Concrete: a trowelable mix of solvent-based asphalt, mineral stabilizers, other fibers and/or fillers. Classified by ASTM Requirement D 2822-91 Asphalt Roof Cement, and also D 4586-92 Asphalt Roof Cement, Asbestos-Free, Types I and II.
Attic: the tooth cavity or open space above the ceiling and promptly under the roof deck of a steep-sloped roof.
Back-Nailing: (likewise referred to as Blind-Nailing) the practice of toenailing the back part of a roofing ply, high roofing system, or various other elements in a manner to make sure that the fasteners are covered by the next sequential ply, or training course, and are not subjected to the weather in the finished roof system.
Ballast: an anchoring material, such as accumulation, or precast concrete pavers, which use the force of gravity to hold (or aid in holding) single-ply roof membranes in place.
Barrel Vault: a structure profile including a spherical profile to the roof on the short axis, but with no angle adjustment on a cut along the long axis.
Base Flashing (membrane base flashing): plies or strips of roof membrane product used to close-off and/or seal a roof at the roof-to-vertical intersections, such as at a roof-to-wall juncture. Membrane layer base blinking covers the side of the area membrane layer. (Also see Flashing.).
Base Ply: the lowermost ply of roofing in a roof membrane or roof system.
Base Sheet: a fertilized, saturated, or layered really felt positioned as the very first ply in some multi-ply built-up and modified bitumen roof membranes.
Batten: (1) cap or cover; (2) in a metal roof: a steel closure established over, or covering the joint in between, adjacent metal panels; (3) timber: a strip of timber usually set in or over the structural deck, used to boost and/or connect a main roof covering such as ceramic tile; (4) in a membrane roof system: a narrow plastic, wood, or steel bar which is made use of to attach or hold the roof membrane layer and/or base flashing in place.
Batten Joint: a metal panel profile attached to and also created around a diagonal wood or metal batten.
Asphalt: (1) a class of amorphous, black or dark colored, (strong, semi-solid, or viscous) cementitious sub-stances, all-natural or made, composed principally of high molecular weight hydrocarbons, soluble in carbon disulfide, and also discovered in petroleum asphalts, coal tars and also pitches, wood tars and asphalts; (2) a generic term used to signify any product composed mostly of bitumen, normally asphalt or coal tar.
Blackberry (in some cases described as Blueberry or Tar-Boil): a little bubble or sore in the flood coating of an aggregate-surfaced built-up roof membrane.
Blind-Nailing: the use of nails that are not subjected to the weather in the ended up roofing system.
Sore: an encased pocket of air, which may be blended with water or solvent vapor, trapped in between imper-meable layers of felt or membrane, or between the membrane and also substratum.
Barring: sections of timber (which might be preservative dealt with) developed right into a roof assembly, generally attached above the deck and also listed below the membrane or flashing, utilized to tense the deck around an opening, serve as a quit for insulation, sustain a curb, or to work as a nailer for add-on of the membrane layer and/or blinking.
BOMA: Structure Owners & Managers Organization.
Brake: hand- or power-activated machinery made use of to develop steel.
British Thermal Device (BTU): the heat required to elevate the temperature level of one extra pound of water one level Fahrenheit (joule).
Brooming: an activity accomplished to help with embedment of a ply of roofing product right into hot asphalt by using a broom, squeegee, or special apply to smooth out the ply and guarantee contact with the bitumen or adhe-sive under the ply.
Twist: an upwards, lengthened tenting variation of a roof membrane often happening over insulation or deck joints. A fastening may be an indicator of activity within the roof assembly.
Building regulations: published policies and ordinances developed by an acknowledged firm suggesting style tons, procedures, and also building details for structures. Normally applying to marked territories (city, county, state, and so on). Building regulations regulate style, construction, as well as quality of materials, usage and occupancy, location as well as maintenance of structures and visit this site right here frameworks within the area for which the code has actually been embraced.
Built-Up Roof Membrane (BUR): a continuous, semi-flexible multi-ply roof membrane layer, containing plies or layers of saturated felts, coated felts, fabrics, or floor coverings in between which alternative layers of asphalt are used. Normally, built-up roof membranes are appeared with mineral aggregate and also bitumen, a liquid-applied coat-ing, or a granule-surfaced cap sheet.
Package: a specific plan of drinks or shingles.
Butt Joint: a joint formed by nearby, different sections of material, such as where 2 surrounding items of insulation abut.
Button Punch: a procedure of indenting 2 or even more thicknesses of metal that are pressed versus each other to avoid slippage in between the steel.
Butyl: rubber-like product produced by copolymerizing isobutylene with a small amount of isoprene. Butyl may be made in sheets, or mixed with various other elastomeric materials to make sealants as well as adhesives.
Butyl Finish: an elastomeric finishing system stemmed from polymerized isobutylene. Butyl finishes are char-acterized by low tide vapor leaks in the structure.
Butyl Rubber: a synthetic elastomer based on isobutylene as well as a small quantity of isoprene. It is vulcanizable and features low leaks in the structure to gases and water vapor.
Butyl Tape: a sealer tape occasionally made use of between metal roof panel joints and end laps; also made use of to secure other sorts of sheet metal joints, as well as in different sealer applications.
Camber: a mild convex curve of a surface, such as in a prestressed concrete deck.
Canopy: any type of overhanging or forecasting roof structure, usually over entryways or doors. In some cases the extreme end is unsupported.
Cant: a beveling of foam at an appropriate angle joint for toughness and also water run.
Cant Strip: a diagonal or triangular-shaped strip of timber, timber fiber, perlite, or other material made to act as a steady transitional airplane between the straight surface area of a roof deck or stiff insulation and an upright surface.
Cap Flashing: normally made up of metal, used to cover or protect the upper sides of the membrane base flashing, wall flashing, or primary flashing. (See Flashing and Coping.).
Cap Sheet: a granule-surface layered sheet utilized as the top ply of some built-up or customized bitumen roof membrane layers and/or blinking.
Capillary Action: the activity that triggers activity of liquids by surface area tension when touching two surrounding surfaces such as panel side laps.
Caulking: (1) the physical procedure of securing a joint or juncture; (2) securing and making weather-tight the joints, joints, or voids between surrounding devices by full of a sealer.
Cavity Wall surface: a wall developed or arranged to supply an air space within the wall (with or without insulating product), in which the inner and also outer materials are looped by architectural framing.
CCF: 100 cubic feet.
Chalk: a grainy deposit on the surface of a material.
Chalk Line: a line made on the roof by breaking a tight string or cord dusted with tinted chalk. Used for positioning objectives.
Chalking: the deterioration or movement of an ingredient, in paints, coatings, or other materials.
Smokeshaft: rock, masonry, upreared steel, or a timber mounted structure, consisting of several flues, forecasting through and above the roof.
Cladding: a material utilized as the exterior wall room of a building.
Cleat: a steel strip, plate or steel angle item, either constant or specific (" clip"), made use of to safeguard 2 or even more elements together.
Closed-Cut Valley: a technique of valley application in which shingles from one side of the valley expand throughout the valley while shingles from the opposite side are trimmed about 2 inches (51mm) from the valley centerline.
Closure Strip: a steel or resistant strip, such as neoprene foam, utilized to close openings created by signing up with steel panels or sheets and also flashings.
Coal Tar: a dark brownish to black colored, semi-solid hydrocarbon obtained as residue from the partial evapo-ration or distillation of coal tars. Coal tar pitch is more improved to adapt the complying with roofing grade specifications:.
Coal Tar Asphalt: an exclusive trade name for Type III coal tar made use of as the dampproofing or waterproof-ing representative in dead-level or low-slope built-up roof membranes, complying with ASTM D 450, Kind III.
Coal Tar Pitch: a coal tar made use of as the waterproofing agent in dead-level or low-slope built-up why not try here roof mem-branes, complying with ASTM Specification D 450, Kind I or Type III.
Coal Tar Waterproofing Pitch: a coal tar used as the dampproofing or waterproofing representative in below-grade frameworks, complying with ASTM Specification D 450, Type II.
Covered Base Sheet: a felt that has actually previously been filled (filled up or impregnated) with asphalt as well as later covered with more difficult, extra thick asphalt, which significantly increases its impermeability to dampness.
Coated Textile: textiles that have actually been impregnated and/or covered with a plastic-like material in the form of a remedy, dispersion hot-melt, or powder. The term additionally applies to products arising from the application of a preformed film to a material using calendering.
Covered Felt (Sheet): (1) an asphalt-saturated really felt that has actually likewise been covered on both sides with more difficult, a lot more viscous "finish" asphalt; (2) a glass fiber felt that has actually been at the same time fertilized and coated with asphalt on both sides.
Coating: a layer of material spread over a surface area for defense or decoration. Coatings for SPF are normally fluids, semi-liquids, or mastics; spray, roller, or brush used; and cured to an elastomeric consistency.
Communication: the level of inner bonding of one substance to itself.
Cold Process Built-Up Roof: a constant, semi-flexible roof membrane layer, containing a ply or plies of felts, floor coverings or various other reinforcement fabrics that are laminated along with alternating layers of liquid-applied (generally asphalt-solvent based) roof seals or adhesives mounted at ambient or a somewhat raised temperature level.
Flammable: capable of burning.
Compatible Products: 2 or even more materials that can be mixed, combined, or attached without separating, reacting, or impacting the materials adversely.
Composition Shingle: an unit of asphalt shingle roofing.
Concealed-Nail Method: an approach of asphalt roll roofing application in which all nails are driven right into the underlying program of roofing and also covered by an adhered, overlapping training course.
Condensation: the conversion of water vapor or various other gas to liquid state as the temperature goes down or atmos-pheric stress surges. (Likewise see Humidity.).
Conductor Head: a change component between a through-wall scupper as well as downspout to gather and also route run-off water.
Contact Cements: adhesives used to adhere or bond different roofing elements. These adhesives adhere mated elements immediately on contact of surfaces to which the adhesive has been applied.
Contamination: the process of making a material or surface unclean or inadequate for its desired objective, usually by the addition or attachment of undesirable foreign substances.
Coping: the covering item in addition to a wall which is exposed to the weather, usually constructed from metal, stonework, or stone. It is ideally sloped to drop water back onto the roof.
Copper: an all-natural weathering metal made use of in metal roofing; generally utilized in 16 or 20 ounce per square foot thickness (4.87 or 6.10 kg/sq m).
Cornice: the ornamental straight molding or projected roof overhang.
Counterflashing: developed steel sheeting secured on or right into a wall, aesthetic, pipeline, rooftop system, or various other surface, to cover as well as shield the upper edge of the membrane base blinking or underlying metal flashing as well as linked fasteners from exposure to the weather condition.
Course: (1) the term utilized for every row of shingles of roofing product that creates the roofing, waterproofing, or flashing system; (2) one layer of a series of materials put on a surface area (e.g., a five-course wall surface blinking is made up of 3 applications of roof concrete with one ply of felt or fabric sandwiched between each layer of roof cement).
Protection: the area covered by a certain amount of a certain product.
Cricket: a raised roof substratum or framework, created to draw away water around a smokeshaft, visual, far from a wall surface, development joint, or various other projection/penetration. (See Saddle.).
Cross Air flow: the result that is given when air actions via a roof dental caries in between the vents.
Cupola: a fairly little roofed structure, typically set on the ridge or optimal of a major roof location.
Curb: (1) a raised member made use of to sustain roof infiltrations, such as skylights, mechanical devices, hatches, and so on over the degree of the roof surface area; (2) an increased roof perimeter relatively reduced in elevation.
Cure: a process wherein a material is caused to create irreversible molecular links by exposure to chemicals, warmth, stress, and/or weathering.
Cure Time: the moment needed to effect healing. The time required for a product to reach its desirable long-term physical characteristics.
Cutoff: an irreversible detail developed to seal and avoid side visit the site water motion in an insulation system, and utilized to isolate areas of a roofing system. (Note: A cutoff is various from a tie-off, which may be a short-lived or long-term seal.) (See Tie-Off.).
Intermediary: the open parts of a strip tile between the tabs.