As the premier family-owned roofing company in the Sarasota and Bradenton area since 2006, AKVM values transparency in our practices. That includes ensuring our customers understand exactly what we mean when we speak our roofing language so that you can confidently make informed decisions regarding the roofing services performed on your home or business. This comprehensive glossary of roofing terms is a great tool to help you learn more about the inner workings of your home’s front line of defense against wind, rain, algae and pests.
The measure of a material’s ability to accept or soak up moisture
The process in which materials are tested by intentional exposure in a controlled environment to various elements such as heat, water, condensation or light.
A composition of rock, stone, crushed stone, crushed slag, water-worn gravel and/or marble chips used for surfacing a roof system
A type of roof discoloration caused by the growth of algae on its surface
Patterned cracking of the surfacing bitumen on a built-up roof resembling an alligator’s hide
A lightweight non-rusting metal used in the construction of some roofing components
The temperature of the air
Method of applying very large individual roofing shingles in which the long dimension is parallel to the rake and shingles are applied with a 3/4-inch space between adjacent shingles in a course
A flashing located at the point where the top of the sloped roof and a vertical wall or steeper-sloped roof join
Roofing shingle that provides a dimensional appearance
A bituminous waterproofing agent applied to roofing materials during manufacturing
An asphalt-based cement used to bond roofing materials
The practice of nailing the back portion of a roofing ply so that the fasteners are concealed by the next sequential ply or course and are not exposed to the weather in the finished roof system
Fine mineral matter applied to the back side of shingles to keep them from sticking
A ventilation system in which half of the required ventilation is provided by vents located in the upper portion of the roof with the other half provided by soffit vents
An anchoring material, such as aggregate or concrete pavers, that uses gravity to hold single-ply roofing membranes in place
An arched or rounded roof profile
Flashing attached with the purpose of directing the flow of water onto the roof covering
The lowermost ply of a roof system
An impregnated, saturated or coated felt placed as the first ply in some multi-ply built-up and modified bitumen roof membranes
A metal or wood strip or cap that covers the joints between adjacent roofing panels or tiles.
A metal panel profile attached to and formed around a beveled wood or metal batten
A type of liquid binding agent that holds asphalt together
A small bubble or blister in the flood coating of roofing membrane
Bubbles that may appear on the surface of asphalt roofing after installation
Sections of wood built into a roof assembly, typically used to reinforce the deck around an opening, act as a stop for insulation, support a curb or to serve as a nailer for attachment of the roofing membrane and/or flashing
A method of reroofing in which the new shingles follow the contour of the old roofing.
A flat or low-slope roof consisting of multiple layers of asphalt and ply sheets
A semi-flexible multi-ply roofing membrane, consisting of layers of felts or fabrics between which alternate layers of bitumen are applied
A single package of shingles. There are 3, 4 or 5 bundles per square.
The lower edge of the shingle tabs
A joint formed by adjacent sections of material, such as shingles or insulation
A practice of indenting two or more thicknesses of metal that are pressed against each other, forming a ‘button’ or dimple that secures the two pieces together
Rubber-like material produced in sheets or blended with other elastomeric materials to make sealants, coatings and adhesives
A slight convex curve of a surface that serves to allow water to run off of the roof
Any overhanging or projecting roof structure, typically over entrances or doors
A beveling of foam at a right-angle joint for strength and water runoff
A beveled or triangular-shaped strip of wood or other material that serves as a transitional plane between the horizontal surface of a roof and the vertical surface of the outer wall of the structure
Flashing, typically metal, used to cover the upper edges of the membrane base flashing
A coated sheet used to cover and protect the layers of roofing below it for the purpose of helping to extend the life of the roof
The movement of water through porous materials through water’s cohesive and adhesive properties. Capillary action causes water to be sucked into any small gap in a building; the action is lessened when the gap is larger than a half-inch.
To fill a joint or crack with mastic or asphalt cement to help prevent leaks
A wall built or arranged to provide an air space within the wall (with or without insulating material), in which the inner and outer materials are joined together by structural framing
100 cubic feet
The degradation or migration of an ingredient in paints, coatings or other materials
The material that makes up the exterior layer of a building
The highest fire-resistance rating for roofing; indicates roofing is able to withstand severe exposure to fire originating from sources outside the building
Fire-resistance rating that indicates roofing materials are able to withstand moderate exposure to fire originating from sources outside the building
Fire-resistance rating that indicates roofing materials are able to withstand light exposure to fire originating from sources outside the building
A metal strip, plate or metal angle piece used to secure two or more elements together
A method of applying roofing materials in which shingles from one side of the valley extend across the valley, while shingles from the other side are trimmed two inches from the valley centerline. This method ensures that the valley flashing is not exposed.
A metal or foam strip used to seal openings between joined metal panels and flashings
A coal tar used as the waterproofing agent in level or low-slope built-up roof membranes
A semi-flexible roof membrane consisting of a ply or plies of felts, mats or other reinforcement fabrics that are laminated together with layers of liquid-applied adhesive installed at ambient or slightly elevated temperatures
Pre-formed flange placed over a vent pipe to seal the roof around the vent pipe opening
A unit of asphalt shingle roofing
Application of roll roofing in which all nails are driven into the underlying course of roofing and covered by a cemented, overlapping course so that nails are not exposed to the weather
A transition component between a through-wall scupper and downspout to collect and direct run-off water
An exposed piece of metal or stone covering the top of a wall; typically sloped to allow water to roll back onto the roof
The decorative horizontal molding or projected roof overhang
A portion of flashing attached to a vertical surface to help prevent water from getting behind the base flashing
A row of shingles or roll roofing running the length of the roof
Amount of weather protection provided by the roofing material, i.e. a single-ply roof provides single coverage, a 2-ply roof provides double coverage, etc.
A peaked saddle construction at the back of a chimney to deflect water and help prevent snow and ice from accumulating around the chimney
A relatively small roofed structure, generally set on the ridge or peak of a main roof area
A raised member used to support roof penetrations such as skylights above the level of the roof surface
A process whereby a material is caused to form permanent molecular linkages by exposure to chemicals, heat, pressure and/or weathering
A permanent detail designed to seal and prevent lateral water movement in an insulation system and used to isolate sections of a roofing system
The open portions of a strip shingle between the tabs
An adjustable plate for controlling draft
A surface, such as a rooftop with no intentional slope, that is effectively horizontal or flat
Permanent non-moving loads that result from the weight of a building’s structural and architectural components, mechanical and electrical equipment, and the roof assembly itself Essentially the same as “dead weight” or “dead weight loads”
The surface to which the roofing is applied; typically plywood or oriented strand board (OSB)
The downward displacement of a roofing system under heavy loads of snow, ice or water
Separation of the laminated layers of a component or system
Those loads specified in building codes or standards published by federal, state, county, or city agencies, or in owners’ specifications to be used in the design of a building
A rounded roof that is shaped like a half-circle
A framed window unit projecting through the sloping plane of a roof
Application of asphalt roofing such that the lapped portion is at least two inches wider than the exposed portion, resulting in two layers of roofing material over the deck
The process of applying two layers or flood coats of bitumen and aggregate to a built-up roof
A standing seam that utilizes an overlapping interlock between two seam panels
A pipe for draining water from roof gutters
A weather-resistant material used along the eaves and rakes to allow water runoff to drip clear of the underlying structure
Application of very large individual shingles with the long dimension parallel to the eaves; shingles are applied to overlap adjacent shingles in each course as well as the course below
The horizontal, lowest edge of a sloped roof that extends beyond the exterior wall
Additional layer of roofing material applied at the eaves to help prevent damage from water backup
Boards nailed along eaves and rakes after cutting back existing wood shingles to provide secure edges for reroofing with asphalt shingles
The formulation of crystalline deposits, generally whitish in color, on the surface of stone, brick, concrete, or other masonry surface when moisture moves through and evaporates on the masonry May also be caused by free alkalis leached from mortar, grout or adjacent concrete
A coating system which, when fully cured, is capable of being stretched at least twice its original length (100% elongation) and recovering to its original dimensions
An extension of a building at right angles to its length
A structural separation between two building elements that allows free movement between the elements without damage to the roofing or waterproofing system
Application of roll roofing in which all nails are driven into the topmost course of roofing; nails are exposed to the weather
Type of plywood approved by the American Plywood Association for exterior use
A process by which some single-ply roofing membranes are manufactured, which consists of forcing batched and formulated material (which may be molten) through a die. The shape and dimensions of the die determine the shape and dimensions of the finished product.
A splice/seam made by the manufacturer during the assembly of sections of materials into large sheets
A flat board, band or face located at a cornice's outer edge
Any of a wide variety of mechanical securement devices and assemblies, including nails, screws, cleats, clips, and bolts, which may be used to secure various components of a roof assembly
Tapered wood filler strips placed along the butts of old wood shingles to create a level surface when reroofing over existing wood shingle roofs
Fibrous material saturated with asphalt and used as an underlayment or sheathing paper
A small metal sleeve placed inside a gutter at the top; a spike is nailed through the gutter into the fascia board to hold the gutter in place while the ferrule acts as a spacer to help retain the gutter’s original shape.
An asphalt roofing base material manufactured from glass fibers
The central or main portion of a roof, excluding the perimeter and flashing
System for classifying the fire resistances of various materials. Roofing materials are rated Class A, B or C, with Class A materials having the highest resistance to fire originating outside the structure.
A half-cylindrical-shaped opening in a lapped edge or seam, usually caused by wrinkling or shifting of ply sheets during installation; also refers to the half-conical opening formed at a cut edge of shingles.
Detachment of a uniform layer of a coating or surface material, usually related to internal movement, lack of adhesion, or passage of moisture
The projecting edge of a rigid or semi-rigid component. Ex. metal edge flashing flange, skylight flange, flashing boot, structural member, etc.
The lowest temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture with air near its surface
Pieces of metal or roll roofing used to prevent seepage of water into a building around any intersection or projection in a roof such as vent pipes, chimneys, adjoining walls, dormers and valleys
A method of interlocking metal panels in which one panel edge is folded back on top of itself and the other panel is folded under, hooking the two panels together
The procedure where a controlled amount of water is temporarily retained over a horizontal surface to determine the effectiveness of the waterproofing Free-tab Shingles Shingles that do not contain factory-applied strips or spots of self-sealing adhesive
The upper portion of a sidewall that comes to a triangular point at the ridge of a sloping roof
A type of roof containing a sloping plane on each side of a single ridge with a gable at each end
Trade name for a protective metal roof coating made from aluminum zinc to prevent corrosion
To coat with zinc
A type of roof containing two sloping planes of different pitch on each side of the ridge. The lower plane has a steeper slope than the upper; this type of roof features a gable at each end.
Ceramic-coated colored crushed rock that is applied to the exposed surface of asphalt roofing products
A low profile upward-projecting metal edge flashing with a flange along the roof side, usually formed from sheet or extruded metal. Gravel stops are typically installed along the perimeter of a roof to provide a continuous finished edge for roofing material, which acts as a bitumen-stop during mop application of hot bitumen.
The trough that channels rainwater from the eaves to the downspouts
Shortest distance from the butt edge of an overlapping shingle to the upper edge of a shingle in the second course below; typically, this portion provides triple coverage of the top lap of strip shingles.
The edge created by folding metal back on itself
Shingles that have the appearance of a hexagon after installation
The inclined external angle formed by the intersection of two sloping roof planes Runs from the ridge to the eaves
A type of roof containing sloping planes of the same pitch on each of four sides. This type of roof contains no gables.
Shingles used to cover the inclined external angle formed by the intersection of two sloping roof planes
Ice formed at the lower roof edge by the thawing and refreezing of melted snow on the overhang; can force water up and under shingles, causing damage and potential leaks
The ability of a roofing assembly to resist damage from falling objects
Individual shingles that mechanically fasten to each other to provide wind resistance
Strip shingles containing more than one layer of tabs to create extra thickness
To cover the surface of one shingle or roll with another
An asphalt-based cement used to adhere overlapping plies of roll roofing
Method of installing asphalt shingles on roof slopes between 2:12 and 4:12 (18.5° TO 9.5°)
A slanted opening for ventilation
A type of roof containing two sloping planes of different pitch on each of four sides. The lower plane has a much steeper, often approaching vertical, pitch than the upper. This type of roof includes no gables.
An asphalt-based primer used to prepare masonry surfaces for bonding with other asphalt products
Finely ground limestone, slate, traprock or other inert materials added to asphalt coatings for durability and increased resistance to fire and weathering
Asphalt shingles and roll roofing that are covered with granules
A ventilation system in which openings in the attic are utilized to circulate natural air flow, drawing hot or moist air out to replace it with fresh outside air
A method of reroofing with new asphalt shingles over old shingles in which the top edge of the new shingle is butted against the bottom edge of the existing shingle tab
Area unobstructed by screens, louvers or other materials
Shingles consisting of a single, solid tab with no cutouts
Any wood-based panel that does not contain veneer and carries an APA span rating, e.g. OSB or wafer board
Method of installing asphalt shingles on roof slopes between 4:12 and 21:12
Method of valley construction in which shingles on both sides of the valley are trimmed along a chalk line snapped on each side of the valley. Shingles do not extend across the valley, and valley flashing is exposed
An asphalt roofing base material manufactured from cellulose fibers
That portion of the roof structure that extends beyond the exterior walls of a building
Wooden platforms used for storing and shipping bundles of shingles
Anything, such as a vent, pipe, stack or chimney, that penetrates a roof deck
The degree of roof incline expressed as the ratio of the rise, in inches, to the span, in feet
The number of layers of roofing materials
An asphalt-based cement used to adhere tabs of strip shingles to the course below. Also used to adhere roll roofing laps applied by the concealed nail method.
Roofing application method in which shingle courses are applied vertically up the roof rather than across and up; not an industry-recommended method.
The supporting framing member immediately beneath the deck, sloping from the ridge to the wall plate
The inclined edge of a sloped roof over a wall from the eave to the ridge
Shingles on which tabs vary in size and exposure
A plastic or paper strip that is applied to the back of self-sealing shingles which prevents the shingles from sticking together in the bundles and is not removed prior to application
The uppermost, horizontal external angle formed by the intersection of two sloping roof planes
Shingles used to cover the horizontal external angle formed by the intersection of two sloping roof planes
The vertical distance from the eaves line to the ridge
Asphalt roofing products manufactured in roll form
A compound used to seal flashings, seal down shingles and for other small waterproofing jobs
An asphalt-saturated tape used with asphalt cements for flashing and patching asphalt roofing
The horizontal distance from the eaves to a point directly under the ridge; one-half the span
Asphalt used to impregnate an organic felt base material Saturated Felt An asphalt-impregnated felt used as an underlayment between the deck and the roofing material
A thermal-sealing tab cement built into the shingle to firmly cement the shingles together automatically after they have been applied properly and exposed to warm sun temperatures
Shingles containing factory-applied strips or spots of self-sealing adhesive
Factory-applied adhesive that bonds shingle courses together when exposed to the heat of the sun after application
That portion of roll roofing overlapped by the succeeding course to obtain double coverage
Slight differences in shingle color that may occur as a result of normal manufacturing operations
Exterior-grade boards used as a roof deck material
A roof containing only one sloping plane Has no hips, ridges, valleys or gables
Asphalt roofing that provides one layer of roofing material over the deck
The degree of roof incline expressed as the ratio of the rise, in inches, to the run, in feet
Roll roofing that is coated with ground talc or mica instead of granules
The finished underside of the eaves
A vent pipe that penetrates the roof
The horizontal distance from eave to eave
A self-adhesive waterproofing shingle underlayment designed to protect against water infiltration due to ice dams or wind-driven rain
A unit of roof measure covering 100 square feet
Shingles on which tabs are all the same size and exposure
Asphalt roofing applied at the eaves that provides protection by filling in the spaces under the cutouts and joints of the first course of shingles
Method of installing asphalt shingles on roof slopes greater than 21 inches per foot
Flashing application method used where a vertical surface meets a sloping roof plane
A single-layer shingle commonly known as a three-tab shingle because it has three tabs
The exposed portion of strip shingles defined by cutouts
A shingle distortion that may arise when a new roof is applied over an uneven surface
That portion of the roofing covered by the succeeding course after installation
Custom-engineered components that supplement rafters in many newer homes and buildings
Underwriters Laboratories, LLC
Label displayed on packaging to indicate the listing for fire and/or wind resistance of asphalt roofing
Underside area of the overhang at the eave of the roof
A layer of asphalt-saturated felt which is laid down on a bare deck before shingles are installed to provide additional protection for the deck
The internal angle formed by the intersection of two sloping roof planes to provide water runoff
Any material used to prevent the passage of water vapor
Any outlet for air that protrudes through the roof deck, such as a pipe or stack
Devices that eject stale air and circulate fresh air
Method of valley construction in which shingles from both sides of the valley extend across the valley and are woven together by overlapping alternate courses as they are applied; the valley flashing is not exposed.