___________________________
ARCHITECTURAL ROOF COATINGS
4821 GRISHAM DR.
ROWLETT, TEXAS
75088-3950
Ph: 972 - 864 - 0240
Fax: 972 - 200 - 4419
E-MAIL arc1913@yahoo.com
________________________
THE FOLLOWING IS PROVIDED AS THE BASIS UPON WHICH ROOF COATINGS, INC. dba ARC
ENGAGES IN COMMERCE IN THE UNITED STATES OF AMERICA, ITS TERRITORIES AND ANY
JURISDICTION IN ANY COUNTRY WHEREIN THERE IS AN ESTABLISHED UNITED STATES OF
AMERICA EMBASSY.
[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]
A
ASTM
American Society for Testing and Measurement is a not-for-profit organization which provides a forum for producers and consumers to meet on common ground and to write standards for materials, products, systems, and services.
Aggregate
(1) crushed stone, crushed slag or water worn gravel used for surfacing a built-up roof
(2) any granular mineral material
Alligatoring
the cracking of the surfacing bitumen on a built-up roof, producing a pattern of cracks similar to an alligator's hide; the cracks may or may not extend through the surfacing bitumen.
Application Rate
the quantity (mass, volume or thickness) of material applied per unit area.
Area Divider
a raised, double wood member attached to a properly flashed wood base plate that is anchored to the roof deck. It is used to relieve thermal stresses in a roof system where no expansion joints have been provided.
Asbestos
a group of natural, fibrous, impure silicate materials.
Asphalt
a dark brown to black cementitious material in which the predominating constituents are bitumens, which occur in nature or are obtained in petroleum processing.
Dead-Level Asphalt: a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type I.
Flat Asphalt: a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type II.
Steep Asphalt: a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type III.
Special Steep Asphalt: a roofing asphalt conforming to the requirements of ASTM Specification D 312, Type IV.
Asphalt, Air Blown
an asphalt produced by blowing air through molten asphalt at an elevated tempertaure to raise its softening point and modify other properties.
Asphalt Felt
an asphalt-saturated felt or an asphalt coated felt.
Asphalt Mastic
a mixture of asphaltic material and graded mineral aggregate that can be poured when heated but requires mechanical manipulation to apply when cool.
Asphaltene
a high molecular weight hydrocarbon fraction precipitated from asphalt by a designated paraffinic naptha solvent at a specified temperature and solvent-asphalt ratio. NOTE: The asphaltene fraction should be identified by the temperature and solvent asphalt ratio used.
Assembly
joining together of individual roofing and waterproofing products.
B
Backnailing
the practice of blind-nailing roofing felts to a substrate in addition to hot mopping to prevent slippage.
Base Ply
the lowermost ply of roofing material in a roof assembly.
Base Sheet
a saturated or coated felt placed as the first ply in some multi-ply built-up roof membranes.
Bitumens
(1) a class of amorphous, black or dark colored, (solid, semi-solid or viscous) cementitious substances. natural or manufactured, composed principally of high molecular weight hydrocarbons, soluble in carbon disulfide, and found in asphalts, tars, pitches and asphaltites;
(2) a generic term used to denote any material composed principally of bitumen.
Bituminous
containing or treated with bitumen. Examples: bituminous concrete, bituminous felts and fabrics, bituminous pavement.
Bituminous Emulsion
(1) a suspension of minute globules of bituminous material in water or in an aqueous solution;
(2) a suspension of minute globules of water or an aqueous solution in a liquid bituminous material (invert emulsion).
Blind Nailing
the practice of nailing the back portion of a roofing ply in a manner that the fasteners are not exposed to the weather in the finished product.
Blister
an enclosed pocket of air mixed with water or solvent vapor, trapped between impermeable layers of felt, or between the felt and substrate.
Blocking
wood built into a roofing system above the deck and below the membrane and flashing to stiffen the deck around an opening, act as a stop for insulation, or to serve as a nailer for attachment of the membrane or flashing.
Bond
the adhesive and cohesive forces holding two roofing components in intimate contact.
Breaking Strength
The amount of tension required to cause material or a system to give way or collapse. It is calculated by measuring the amount of force rewuired to fracture a uniform sized sample.
Brooming
embedding a ply of roofing material by using a broom to smooth out the ply and ensure contact with the adhesive under the ply.
British Thermal Unit (BTU)
the heat energy required to raise the temperature of 1 pound of water 1 degree Fahrenheit.
Built-Up Roof Membranes
a continuous, semi-flexible roof membrane assembly, consisting of plies of saturated felts, coated felts, fabrics or mats between which alternate layers of bitumen are applied, generally surface with mineral aggregate, bituminous materials, or a granule-surfaced roofing sheet. (Abbreviation: BUR)
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C
Cant Strip
a beveled strip used under flashing to modify the angle at the point where the roofing or waterproofing membrane meets any vertical element.
Capillarity
the action by which the surface of a liquid (where it is in contact with a solid) is elevated or depressed, depending upon the relative attraction of the molecules of the liquid for each other and for those of the solid.
Cap Sheet
a granule-surfaced coated sheet used as the top ply of a built-up roof membrane or flashing.
Caulking
a composition of vehicle and pigment, used at ambient temperatures for filling joints, that remains plastic for an extended time after application.
Coal Tar
a dark brown to black, semi-solid hydrocarbon obtained as residue from the partial evaporation or distillation of coal.
Coal-Tar Pitch
a coal tar used as the waterproofing agent in dead-level or low slope built-up roof membrane, conforming to ASTM Specification D 450, Type I.
Coal-Tar Waterproofing Pitch: a coal tar used as the damproofing or waterproofing agent in below-grade structures, conforming to ASTM D 450, Type II.
Coal-Tar Bitumen: a coal tar used as the waterproofing agent in dead-level or low slope built-up roof membrane, conforming to ASTM D 450, Type III.
Coal-Tar Felts
a felt that has been saturated with refined coal tar.
Coated Sheet Felt
(1) an asphalt felt that has been coated on both sides with harder, more viscous asphalt;
(2) a glass fiber felt that has been simultaneously impregnated and coated with asphalt on both sides.
Cold-Processing Roofing
a continous, semi-flexible roof membrane, consisting of plies of felts, mats, or fabrics that are laminated on a roof with alternate layers of cold-applied roof cement and surfaced with a cold-applied coating.
Condensation
the conversion of water vapor or other gas to liquid as the temperature drops or the atmospheric pressure rises.
Coping
the covering piece on top of a wall exposed to the weather, usually sloped to shed water.
Counterflashing
formed metal or elastomeric sheeting secured on or into a wall, curb, pipe, rooftop unit or other surface, to cover and protect the upper edge of a base flashing and its associated fasteners.
Course
(1) the term used for each application of material that forms the waterproofing system or the flashing;
(2) one layer of a series of material applied to a surface (i.e., a five-course wall flashing is composed of three applications of mastic with one ply of felt sandwiched between each layer of mastic.)
Coverage
the surface area continuously covered by a specific quantity of a particular roofing material.
Crack
a separation or fracture occurring in a roof membrane or roof deck, generally caused by thermal induced stress or substrate movement.
Creep
the permanent deformation of a roofing material or roof system caused by the movement of the roof membrane that results from continuous thermal stress or loading.
Cricket
a relatively small, elevated area of a roof constructed to divert water.
Cutback
solvent-thinned bitumen used in cold process roofing adhesives, flashing cements and roof coatings.
Cutoff
a detail designed to prevent lateral water movement into the insulation where the membrane terminates at the end of a day's work, or used to isolate sections of the roofing system. It is usually removed before the continuation of the work.
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D
Damproofing
treatment of a surface or structure to resist the passage of water in the absence of hydrostatic pressure.
Dead Level
absolutely horizontal, or zero slope.
Dead Loads
non-moving rooftop loads, such as mechanical equipment, air conditioning units, and the roof deck itself.
Deck
the structural surface to which the roofing or waterproofing system is applied.
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.
Double-Pour
the process of applying two layers of aggregate and bitumen to a built-up roof.
Drain
a device that allows for the flow of water from a roof area.
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E
Edge Sheets
felt strips that are cut to widths narrower than the standard width of the full felt roll, used to start the felt shingling pattern at a roof edge.
Edge Stripping
application of felt strips cut to narrower widths than the normal felt roll width to cover a joint between flashing and built-up roofing.
Edge Venting
the practice of providing regularly spaced protected opening along a roof perimeter to relieve moisture vapor pressure.
Elastomeric
a rubber like synthetic polymer that will strecth when pulled and will return quickly to its original shape when released.
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 pressing granules into coating in the manufacture of factory prepared roofing.
Emulsion
the homogeneous dispersion of an organic material and water achieved by using a chemical or clay emulsifying agent.
Envelope
a continuous membrane edge seal formed at the perimeter and at penetrations by folding the base sheet or ply over the plies above and securing it to the top of the membrane. The envelope prevents bitumen seepage from the edge of the membrane.
Equiviscous Temperature (EVT)
the temperature at which the viscosity is 75 centipoise for asphalt and 25 centipoise for coal tar products; the recommended temperature for mopping asphalt plus or minus 25 F at the time of application.
Expansion Joint
a structural separation between two building elements that allows free movement between the elements without damage to the roofing or waterproofing system.
Exposure
(1) the traverse dimension of a roofing element not overlapped by an adjacent element in any roof system. The exposure of any ply in a membrane may be computed by dividing the felt width minus 2 inches by the number of shingled plies.
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F
Fabric
a woven cloth of organic or inorganic filaments, threads or yarns.
Factory Mutual (FM)
an organization that classifies roof assemblies for their fire characteristics and wind uplift resistance for insurance companies in the United States.
Factory Square
108 square feet of roofing material
Felt
a flexible sheet manufactured by the interlocking of fibers through a combination of mechanical work, moisture and heat. Felts are manufactured principally from vegetable fibers (organic felts), or glass fibers (glass fiber felts); other fibers may be present in each type.
Felt Layer
a machine used for applying bitumen and built-up roofing plys.
Fine Mineral Surfacing
water-insoluble, inorganic material, more than 50 percent of which passes the No. 35 sieve, used on the surface of roofing.
Fishmouth
(1) a half-cylindrical or half-conical opening formed by an edge wrinkle;
(2) in shingles, a half-conical opening formed at a cut edge.
Flashing
the system used to seal membrane edges at walls, expansion joints, drains, gravel stops, and other places where the membrane is interrupted or terminated. Base flashing covers the edge of the membrane. Cap flashing or counterflashing shields the upper edges of the base flashing.
Flashing Cement
a trowelable mixture of cutback bitumen and mineral stabilizers, including organic or other inorganic fibers.
Flood Coat
the top layer of bitumen into which the aggregate is embedded on an aggregate-surfaced built-up roof.
Fluid Applied
an elastomeric material, fluid at ambient temperature, that dries or cures after application to form a continuous membrane. Such systems normally do not incorporate reinforcement.
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G
Glass Felt
glass fibers bonded into a sheet with resin and suitable for impregnation in the manufacture of bituminous waterproofing materials, roof membranes, and shingles.
Glass Mat
a mat composed of glass fibers with or without a binder.
Glaze Coat
(1) the top layer of asphalt in a smooth surfaced built-up roof assembly;
(2) a thin protective coating of bitumen applied to the lower plies ot top ply of a built-up roof membrane when application of additional felts or the flood coat and aggregate surfacing are delayed.
Gravel
course, granular aggregate, with pieces larger than sand grains, resulting from the natural erosion of rock.
Gravel Stop
a flanged device, frequently metallic, designed to provide a continuous finished edge for roofing material and to prevent loose aggregate from washing off the roof.
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H
Headlap
the minimum distance, measured at 90 degrees to the eaves along the face of a shingle or felt, from the upper edge of the shingle or felt to the nearest exposed surface.
Holiday
an area where a liquid-applied material is missing.
Hot
"Hot Stuff" or "Hot", the roofer's term for hot bitumen.
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I
Ice Dam
a mass of ice formed at the transition from a warm to a cold roof surface, frequently formed by refreezing meltwater at the overhang of a steep roof, causing ice and water to back up under roofing materials.
Incline
the slope of a roof expressed either in percent or in the number of vertical units of rise per horizontal unit of run.
Inorganic
being or composed of matter other than hydrocarbons and their derivatives, or matter that is not of plant or animal origin.
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J
Job-Average Basis
a technique for determining the average dimensions or quantities of material, by analysis of roof test cuts. The technique requires a minimum of three test cuts per roof area, plus one cut for each additional 10,000 square feet of roof area. Job-average basis is computed by dividing the sum of all measurements taken by the number of measurements taken. The results would describe the job-average for the quantity or dimension.
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K
Knot
an imperfection or non-homogeneity in materials used in fabric construction, the presence of which causes surface irregularities.
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L
Live Loads
moving roof installation equipment, wind, snow, ice or rain.
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M
owner or building occupant shall inspected a minimum of every 12 months the completed ARC system and remove as needed (a) dirt build-up, (b) debris, (c) stored materials, (d) plant growth, (e) mold, algae, fungus growth; and repair as needed (a) cracks, (b) peeling, (c) ruptures or separation in the finish product with same materials as was originally supplied from manufacturer. declaration of particular product ingredients that are hazardous and physical properties in accordance with EPA strict standards for the use, handling, storage, clean up and disposal.
Membrane
a flexible or semi-flexible roof covering or waterproofing layer, whose primary function is the exclusion of water.
Metal Flashing
(See Flashing.) Metal flashing is frequently used as through-wall flashing, cap flashing, counterflashing or gravel stops.
Mineral Granules
opaque, natural, or synthetically colored aggregate commonly used to surface cap sheets, granule-surfaced sheets, and roofing shingles.
Mineral Stabilizer
a fine, water-insoluble inorganic material, used in a mixture with solid or semi-solid bituminous materials.
Mineral-Surfaced Roofing
built-up roofing materials whose top ply consists of a granule-surfaced sheet.
Mineral-Surfaced Sheet
a felt that is coated on one or both sides with asphalt and surfaced with mineral granules.
Modified Bitumen
are composite sheets consisting of a copolymer modified bitumen often reinforced and sometimes surfaced with various types of films, foils, and mats.
Mop-and-Flop
an application procedure in which roofing elements (insulation boards, felt plies, cap sheets, etc.) are initially placed upside down adjacent to their ultimate location, are coated with adhesive, and are then turned over and applied to the substrate.
Mopping
the application of hot bitumen with a mop or mechanical applicator to the substrate or to the felts of a built-up roof membrane.
Solid Mopping: a continuous mopping of a surface, leaving no unmopped areas.
Spot Mopping: a mopping pattern in which hot bitumen is applied in roughly circular areas, leaving a grid of unmopped, perpendicular bands on the roof.
Sprinkle Mopping: a random mopping pattern in which heated bitumen beads are strewn onto the substrate with a brush or mop.
Strip Mopping: a mopping pattern in which hot bitumen is applied in parallel bands.
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N
Neoprene
a synthetic rubber (polychloroprene) used in liquid-applied and sheet applied elastomeric roof membrane or flashings.
Ninety-Pound
a prepared organic felt roll roofing with a granule surfaced exposure that has a mass of approximately 90 pounds per 108 square feet.
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O
Organic
being or composed of hydrocarbons or their derivatives, or matter of plant or animal origin.
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P
Parapet Wall
that part of any wall entirely above the roof.
Perlite
an aggregate used in lightweight insulating concrete and in preformed perlitic insulation board, formed by heating and expanding siliceous volcanic glass.
Phased Application
the installation of a roof system or waterproofing system during two or more separate time intervals.
Picture Framing
a rectangular pattern of ridges in a roof membrane over insulation or deck joints.
Pitch Pocket
a flange, open-bottomed, metal container placed around columns or other roof penetrations that is filled with hot bitumen or flashing cement to seal a projection.
Ply
a layer of felt in a built-up roof membrane system. A four-ply membrane system has four plies of felt.
Ponding
a roof surface that is incompletely drained.
Positive Drainage
the drainage condition in which consideration has been made for all loading deflections of the deck, and additional roof slope has been provided to ensure drainage of the roof area within 48 hours of rainfall.
Primer
a thin, liquid bitumen applied to a surface to improve the adhesion of subsequent applications of bitumen.
Product Data Sheet
declaration in writing regarding a
particular product which can include physical characteristics, design,
recommended use, limitations, benefits, cautions, disclaimer, etc.
Properly Installed
application of products specified in
accordance to written specification provided by manufacturer not the contractor.
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Q
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R
Rake
the slope edge of a roof at the first or last rafter.
Re-covering
the process of covering an existing roofing system with a new roofing system.
Re-entrant Corner
an inside corner of a surface, producing stress concentrations in the roofing or waterproofing membrane.
Reglet
a groove in a wall or other surface adjoining a roof surface for use in the attachment of counterflashing.
Reinforced Membrane
a roofing or waterproofing membrane reinforced with felts, mats, fabrics or chopped fibers.
Relative Humidity
the ratio of the weight of moisture in a given volume of air-vapor mixture to the saturated (maximum) weight of water vapor at the same temperature, expressed as a percentage. For example, if the weight of the moist air is 1 pound and if the air could hold 2 pounds of water vapor at a given temperature, the relative humidity is 50 percent.
Replacement
the practice of removing an existing roof system and replacing it with a new roofing system.
Re-roofing
the process of re-covering or replacing an existing roofing system.
Ridging
an upward, tenting displacement of a roof membrane frequently occurring over insulation joints, deck joints and base sheet edges.
Roll Roofing
smooth-surfaced or mineral-surfaced coated felts.
Roof Assembly
an assembly of interacting roof components (including the roof deck) designed to weatherproof and, normally, to insulate a building's top surface.
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S
Saddle
a small structure that helps channel surface water to drains, frequently located in a valley, and often constructed like a small hip roof or like a pyramid with a diamond shape base.
Saturated Felt
a felt that has been saturated with low softening point bitumen.
Screen
an apparatus with circular apertures for separating sizes of materials.
Scuttle
a hatch that provides access to the roof from the interior of the building.
Seal
(1) a narrow closure strip made of bituminous materials;
(2) to secure a roof from the entry of moisture.
Sealant
a mixture of polymers, fillers, and pigments used to fill and seal joints where moderate movement is expected; it cures to a resilient solid.
Selvage
an edge or edging that differs from the main part of (1) a fabric, or (2) granule-surfaced roll roofing material.
Selvage Joint
a lapped joint designed for mineral-surfaced cap sheets. The mineral surfacing is omitted over a small portion of the longitudinal edge of the sheet below in order to obtain better adhesion of the lapped cap sheet surface with the bituminous adhesive.
Shingle
(1) a small unit of prepared roofing material designed for installation with similar units in overlapping rows on inclines normally exceeding 25 percent;
(2) to cover with shingles;
(3) to apply any sheet material in overlapping rows like shingles
Shingling
(1) the procedure of laying parallel felts so that one longitudinal edge of each felt overlaps and the other longitudinal edge underlaps, an adjacent felt. Normally felts are shingled on a slope so that the water flows over rather than against each lap.
(2) the application of shingles to a sloped roof.
Slag
a hard, air-cooled aggregate that is left as a residue from blast furnaces, used as a surfacing aggregate.
Slippage
relative lateral movement of adjacent components of a built-up membrane, It occurs mainly in roofing membranes on a slope, sometimes exposing the lower plies or even the base sheet to the weather.
Smooth-Surfaced Roof
a built-up roof membrane surfaced with a layer of hot-mopped asphalt, cold-applied asphalt clay emulsion, cold-applied asphalt cutback, or sometimes with an unmopped inorganic felt.
Softening Point
the temperature at which bitumen becomes soft enough to flow, as determined by ASTM D 36-86.
Softening Point Drift
a change in the softening point of bitumen during storage or application.
Specification
a written statement prepared by ARC and
no other entity based on a variety of Product Data Sheets incorporated into a
systematic assembly to provide a waterproofing, coating or protective finish.
a membrane tear resulting from substrate or membrane stress.
Spudding
the process of removing the roofing aggregate and most of the bituminous top coating by scraping and chipping.
Square
the term used to describe 100 square feet of roof area.
Stack Vent
a vertical outlet in a built-up roof system designed to relieve the rpessure exerted by moisture vapor between the roof membrane and the vapor retarder or deck.
Stripping or Strip-Flashing
(1) the technique of sealing a joint between metal and the built-up roof membrane with one or two plies of felt or fabric and hot-applied or cold-applied bitumen;
(2) the technique of taping joints between insulation boards or deck panels.
Substrate
the surface upon which the roofing or waterproofing membrane is applied.
Sump
an intentional depression around a drain.
Superimposed Loads
loads that are added to existing loads. For example, a large stack of insulation boards placed on top of a structural steel deck.
System
combination of products that when
joined together provides an assembly.
Systematic Assembly
the incorporation of individual products to satisfy a desired result such as but
not limited to; protective coating over existing roofs or waterproofing a
horizontal or vertical surface.
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T
Tapered Edge Strip
a tapered insulation strip used to (1) elevate the roof at the perimeter and at curbs that extend through a roof; (2) provide a gradual transition from one layer of insulation to another.
Tar
a brown or black bituminous material, liquid or semi-solid in consistency, in which the predominating constituents are bitumens obtained as condensates in the processing of coal, petroleum, oil-shale, wood, or other organic materials.
Test Cut
a sample of the roof membrane that is cut from a roof membrane to: (a) determine the weight of the average interply bitumen moppings; (b) diagnose the condition of the existing membrane.
Thermal Conductance (C)
a unit of heat flow that is used for specific thicknesses of material or for materials of combination construction, such as laminated insulation.
Thermal Conductivity (k)
the heat energy that will be transmitted by conduction through 1 square foot of 1 inch thick homogeneous material in one hour when there is a difference of 1 degree Fahrenheit perpendicularly across the two surfaces of the material.
Thermal Insulation
a material applied to reduce the flow of heat.
Thermal Resistance (R)
an index of a material's resistance to heat flow; it is the reciprocal of thermal conductivity (k) or thermal conductance (C).
Thermal Shock
the stress-producing phenomenon resulting from sudden temperature changes in a roof membrane when, for example, a rain shower follows brilliant sunshine.
Through-Wall Flashing
a water-resistant membrane or material assembly extending through a wall and its cavaties, positioned to direct water entering the top of the wall to the exterior.
Tuck Pointing
(1) troweling mortar into a joint after masonry units are laid;
(2) final treatment of joints in cut stonework. Mortar or a putty-like filler is forced into the joint after the stone is set.
Type of Warranties: ARC offers (1) Material Warranty, (2) Material and Labor Limited Warranty, (3) Joint Warranty, (4) and NDL Warranty and is issued based upon assumptions.
Type of Warranties
ARC offers (1) Material Warranty, (2)
Material and Labor Limited Warranty, (3) Joint Warranty, (4) and NDL Warranty
and is issued based upon assumptions.
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U
Underwriters Laboratory and Warnock Hersey
Organizations that test and classify consumer products such as roof assemblies to methods defined by objective forums like ASTM.
Used In Accordance With: that ARC specifications and none other is followed and should any part of the specified system or assembly be omitted (left out) the warranty is voided and the performance of the system or assembly is unknown.
that ARC specifications and none other is followed and should any part of the specified system or assembly be omitted (left out) the warranty is voided and the performance of the system or assembly is unknown.Vapor Migration
the movement of water vapor from a region of high vapor pressure to a region of lower vapor pressure.
Vapor Retarder
a material designed to restrict the passage of water vapor through a roof or wall.
Vent
an opening designed to convey water vapor or other gas from inside a building or a building component to the atmosphere, thereby relieving vapor pressure.
Vermiculite
an aggregate used in lightweight insulating concrete, formed by the heating and consequent expansion of a micaceous mineral.
Voided Warranty
the release of ARC from its liability
and the owner’s forfeiture of remedies to ARC’s providing replacement of ARC’s
Roof Coating and labor for the original ARC’s Roof Coatings.
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W
Waterproofing
treatment of a surface or structure to prevent the passage of water under hydrostatic pressure.
Warranty
refers to roofing and waterproofing Systems and Assemblies with
limitations and exclusions which requires performance of building owner or
building occupants to keep the warranty valid for the expected time duration
statement that varies upon the warranty offered.
X
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Y
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Z
DISCLAIMER
ARC will continue to add to this GLOSSARY to bring clarification to questions that arise from contractor or building owners. The definitions assigned to clarify questions will be those of ARC and no other. ARC definition to each question will be the sole interpretation and all parties buying any or part of ARC products or system agrees to this by purchasing ARC products directly or indirectly. ARC will not assume or be liable for misrepresentation by contractors or independent salesperson to buyers, buyer’s agents or representatives or building owner or its representative or agents.