Abstract: A roofing composition is formed as a shingle or from one or more separate sheets. The roofing composition includes a storage layer with an inert non-growing storage medium to absorb and detain precipitation for gradual release. The roofing composition reduces hydraulic discharge rates to avoid overloading downstream drainage systems.

Abstract: An adhesive composition is provided for adhering together roofing materials such as EPDM rubber and thermoplastic polyolefin (TPO). The adhesive composition includes a rubbery polymer comprising a blend of a thermoplastic block copolymer selected from the group consisting styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene-butylene-styrene, styrene-ethylene-propylene-styrene, styrene-ethylene-propylene, ethylene-propylene, and combinations thereof, and a paraffinic hydrocarbon polymer. Roofing articles incorporating the adhesive composition are also provided. The composition is a pressure sensitive adhesive that allows roofing articles to be applied in a peel and stick manner.

Abstract: A construction panel that contains polymer and natural plant fiber. The construction panel has an upper portion in which the polymer is recycled, and a lower portion in which the polymer is not contaminated. The upper portion may contain a large proportion of fire retardant material, so as to increase the burn-through rate. The construction panel can carry a low emissivity covering in non-exposed portions.

Abstract: A hip, ridge or rake shingle is provided, in which a pair of substantially rigid panel portions are connected by a hinge portion, and wherein the shingle is pre-assembled, but can conform to a variety of different angles to accommodate different angular relationships between surfaces of a hip, ridge or rake of a roof. The substantially rigid panel portions are connected by a hinge and may or may not have a reinforcement member, and all of the panels, hinges and reinforcement members are of synthetic thermoplastic polymeric construction and are welded together by ultrasonic or vibratory welding techniques.

Abstract: A roofing system comprising laminated roofing shingles having a reduced-width headlap portion and a buttlap portion, wherein the roofing system comprises a plurality of courses, and wherein a trailing edge of a subsequently installed shingle in a course overlaps the leading edge of an adjacent previously installed shingle in the same course. The reduced-width headlap portion of the roofing shingles has a width that is less than the width of the buttlap portion. The roofing shingle comprises a first and a second shingle sheet and the lateral edges of the first shingle sheet are aligned with the lateral edges of the second sheet.

Abstract: The present invention relates to wall and surface veneering products and systems that provide a replica image of a natural surface, such as stone, brick or wood, and is easily installable due to its lightweight characteristics and securement design. The present invention further includes systems for attachment of the veneering product to walls or other surfaces and also includes systems for assembling such products to provide pleasing arrangements and complete wall coverage. The present invention also includes methods of manufacture, which ensures the natural appearance of stone or wood by imaging a natural surface, such as stone or wood, and preparing a mold from that image to mass produce a replica of that particular surface.

Abstract: The present invention is a vinyl siding panel and a method of making the vinyl siding panel. One embodiment of the vinyl siding panel comprises a planar row extending the longitudinal length of the vinyl siding panel. The siding panel may also have a slightly curved row. A reinforcement panel may be secured to the siding panel. In such case, the slightly curved row of siding may be secured to a planar portion of the reinforcement panel. In addition, an intermediate portion of the siding panel may be thicker than the outer portions of the siding panel.

Abstract: A building includes a tile roof including a plurality of courses of tiles and a roof-cover above which the tiles are positioned, a ceiling below the roof, and a skylight apparatus. Each tile engages adjacent tiles according to a repeating engagement structure. The skylight apparatus includes a main body in place of one or more of the tiles of the tile roof and engages adjacent tiles substantially according to the repeating engagement structure, at least one window, a tubular body below the main body and extending through an aperture in the roof-cover, a light conduit extending downward from below the tubular body and defining an inner passage, and a bottom translucent member at an opening in the ceiling and below a bottom end of the light conduit. Light is able to shine through the window, the inner passage, and the bottom translucent member into a room below the ceiling.

Abstract: A shaped roof element (1) for roofs made of elements, the roof element (1) comprising a first and a second side edge (4, 6), an upper edge (8) and a lower edge (10), a profile substantially parallel to the side edges (4, 6) and a series of steps comprising two or more steps (12, 14) extending substantially parallel to the upper and lower edges (8, 10), the steps being produced so that the lower edge (10) forms one of the steps (14). The step (14) on the lower edge (10) is produced in the form of a round bend (20) bending underneath the shaped roof element (1), the profile of the bend corresponding substantially to a profile parallel to the side edges (4, 6) of the shaped roof element (1).

Abstract: An improved roof tile that is composed of a polymeric isocyanate and water blown component, mineral fiber or fiberglass, said roof tile being molded producing a roof tile with a high R-value thermal insulation and being very light weight. Each tile includes a flat bottom surface including a groove of a predetermined pattern that receives poly foam adhesive for attaching each tile to a roof substrate.

Abstract: A hip, ridge or rake shingle comprised of a plurality of panels sandwiched on each panel portion side of a layer of shingle material, such that each panel portion can be folded along a fold line, and wherein tabs are provided for each panel portion, adapted to be bent backwardly upon themselves, sandwiching thickening panels therebetween. The shingles can be laid up on a hip, ridge or rake of a roof, to yield desirable thickened features.

Abstract: A weather resistant shingle system is provided, wherein a starter strip course of shingles is applied to a roof, and with successive courses of field shingles applied thereover, with adjacent underlying and overlying shingles adhesively secured together to provide wind resistance to tabs of next overlying shingles from being upwardly lifted under wind conditions, and to prevent moisture, such as rain, from entering beneath tabs of shingles.

Abstract: A building panel of the roofing or siding type is disclosed, as well as a building structure having such roofing or siding panels, in which the panels are comprised of two different types of building materials. The composite panel includes at least one layer of synthetic polymeric building material, having adhesively secured thereto at least one layer of asphalt based building material, with outer, upper surfaces of the panel, that would be weather-exposed in the installed condition on a building structure being comprised of the asphalt based building material, and with the synthetic polymeric layer(s) of polymeric building material being weather-protected in the installed condition on a building structure.

Abstract: A composite shingle having unitary construction is presented that includes a body shell, a plurality of longitudinal ribs, and a plurality of rib stiffeners. Further, the present composite shingle may also include transverse ribs, a depressed nailing zone, nailing zone ribs, and/or at least one alignment aid. The present composite shingle may also include spacing nibs. At least a portion of the outside face of composite shingle is textured to resemble slate or wood shake shingles. The butt end wall has a height that creates depth in composite shingle to more closely resemble true slate and shake shingles. The first side wall and second side wall generally taper from a greater height at the butt end to a lesser height at the top end. The longitudinal ribs extend downward from the bottom surface of the body shell to a common plane. There is a plurality of rib stiffeners that also extend downward from the bottom surface of the body shell and each rib stiffener end is integral with a longitudinal rib.

Abstract: An in-line process for forming pre-finished siding manufactured from cellular poly vinyl chloride comprising embossing, milling, parting, punching, and coating the poly vinyl chloride such that the resulting siding is suited for use in an environment exposed to a wide range of fluctuating temperatures and moisture. The process accommodates the natural expansion and contraction of cellular poly vinyl chloride by producing a novel milled clapboard configuration that, when used as siding, can be installed to create a historically correct clapboard installation.

Abstract: Siding panels having indicia indicating a zone into which fasteners should be placed, and methods for manufacturing and installing the panels are disclosed herein. In one embodiment, the siding includes a panel of siding material having a first edge extending along a first dimension, a second edge spaced apart from the first edge a first distance, and a first side with indicia. The indicia define a zone into which at least one fastener should be placed to install the panel. The zone extends along the first dimension and has a width of approximately 0.2 inch to approximately 0.3 inch. The zone has a center line spaced apart from the first edge a second distance of approximately 7 percent to approximately 22 percent of the first distance. The siding material is composed of a continuous, single fiber-cement compound including cement, silica, and cellulose fiber.

Abstract: A shingle blank comprises a substrate coated with an asphalt coating and having an upper surface and a lower surface, the upper surface configured to include a first prime region and a second prime region. The first prime region is substantially covered by prime granules having a first overall visual effect and the second prime region is substantially covered by prime granules having a second overall visual effect different from the first overall visual effect. The shingle blank is capable of being divided into individual cap shingles that can be applied to a roof ridge or hip, with the cap shingles including both the first and second prime regions, thereby enabling the cap shingles to be installed in an overlapping manner on the hip or ridge with either the first or the second prime colors being exposed.

Abstract: A photovoltaic shingle having a photovoltaic assembly with a photovoltaic cell or cells. The substrate has an outward face and an inward face and a profile having a plurality of traverse parallel ridges with each ridge separated from the next ridge by a traverse parallel trough. The substrate facilitates vertical and horizontal nesting and alignment. The photovoltaic cell substantially spans the outward face except for a portion thereof that is intended to be overlapped by another similar shingle. The substrate can have two tiers or more, each tier being separated by an integral riser that creates the appearance of two rows or more of shingles. The substrate can be produced from recyclable plastic. The shingles have a translucent color enhancing means for imparting an uniform color and can be produced in many colors and shapes. The shingle is attached directly to a building or roof structure without an intermediary support or framing structure therebetween.

Abstract: A method and apparatus for installing a stanchion on a tile roof includes a tile which has an aperture and a stanchion which fits through the aperture. An existing roof tile is removed and the stanchion is connected to the roof sheathing at the place of removal. The tile is then placed over the stanchion so that the stanchion project through the aperture. In an embodiment of the invention, a sleeve surrounds the aperture and a seal provides a weather proof seal between the stanchion and the sleeve.

Abstract: The present invention comprises an asphalt roofing shingle with integrated thin film solar cells that is easy to install and scalable to each particular application. The system of the present invention comprises a standard asphalt roofing shingle manufactured with an integrated thin film solar cell connected to two electrodes configured on opposing sides of the shingle. The shingle is dimensioned to that of a standard asphalt shingle. Roofing nails, which are used to install the shingle to the roof, physically attach the shingle to the roof, may also establish an electrical connection between the electrodes of the respective shingles creating a unified electrical circuit amongst the attached solar shingles.

Abstract: A method comprises: providing a fiber cement substrate, and joining a porous, closed cell foam to a substantial portion of a major surface of the fiber cement substrate.

Abstract: An improved roofing material having an upper and lower surface in which a thin layer comprising re-melted polypropylene or other suitable plastic is adhered to at least a portion of its lower surface.

Abstract: Disclosed herein are photovoltaic building materials and related methods of manufacturing and installing such materials. In one embodiment, a modular roofing structure comprises a photovoltaic shingle panel having a planar lower surface and an upper surface, and a rigid back member having a length the same as or greater than the length of the shingle panel and attached to the planar lower surface of the shingle panel. The roofing structure also includes at least one electrical contact pad on a lower surface of the back member, and at least one electrical conductor electrically coupled to the shingle panel via the lower surface and passing through the back member and out the lower surface. In such embodiments, the electrical conductor is electrically coupled to the at least one contact pad and extends past a front end of the back member sufficient to electrically contact a contact pad on another back member of a separate modular roofing structure couplable to the first.

Abstract: A solar roofing system includes components that can be made to mimic traditional tabbed asphalt roofing shingles in size, shape, and performance. Additionally, the shingles also include photovoltaic devices embedded in the shingle tabs. Shingles are installed in a traditional manner using traditional tools and fasteners in offset and overlapping rows. Electrical connectivity among tabs is made by contact between top and bottom surfaces of shingles without the need for additional wiring or hardware. The system includes multiple shingle shapes including a variation that can be cut apart into separate tabs. This solar roofing system can be integrated with non-photovoltaic components to fit irregularities found in a variety of roof surfaces. The system, once installed, creates a redundancy of electrical connectivity throughout a roof surface to allow for interruptions and irregularities in the roof surface and to allow for highly reliable output performance.

Abstract: The invention provides a one piece shingle for use on roof ridges and hips. Shingles of the invention are preferably formed from synthetic materials and preferably comprise a blend of high and low molecular weight polyethylene resins. The unique blend of materials provides a shingle that is both strong while retaining sufficient flexibility to permit the shingle to bend to accommodate a variety of pitches at a ridge or hip. Unique features of the shape and structure of the shingle also make it particularly suited to hip and ridge applications. Furthermore, methods of manufacturing hip and ridge shingles are also disclosed.

Abstract: A sheathing assembly and method of sheathing for a roofing structure including at least one lower layer comprising at least one, but more practically a plurality of panels. The lower layer may be disposed in at least partially overlying relation to a framing assembly of the roofing structure. The sheathing assembly may further include at least one upper layer comprising at least one or more panels. The sheathing assembly may also include a substantially flat central member or layer disposed in an at least partially clamped orientation between the lower layer and the upper layer.

Abstract: A sealant composition for roofing shingles that includes a base asphalt, a linear and/or a radial copolymer, oil, and a wax is provided. The linear copolymer has an A-B di-block or an A-B-A tri-block structure. The radial copolymer may have an (A-B)n radial structure, where n is at least 4, or a tri-block (A-B-A) radial structure having from 4 to 8 arms. Blocks A and B may individually represent (1) styrene and butadiene or (2) styrene and isoprene. The oil is a petroleum-based oil that both “softens” the asphalt and reduces the viscosity of the sealant composition. The wax may be a bis-stearamide wax. Additionally, the sealant composition may be reacted with elemental sulfur to crosslink the copolymer blend. The sealant composition seals at temperatures lower than conventional sealants and promotes the easy release of the shingle from a shingle bundle.

Abstract: Modular plastic structural composites having a web section disposed along a horizontal axis and at least one flange section disposed along a horizontal axis parallel thereto and integrally molded to engage the top or bottom surface of the web section, wherein said composite is formed from a mixture of (A) high density polyolefin and (B) a thermoplastic-coated fiber material, polystyrene, or a combination thereof. Composites molded in the form of I-Beams and bridges constructed therefrom are also disclosed.

Abstract: A shingle and method is provided, wherein the shingle includes a shingle back having at least one back conductive trace and a shingle front configured to securely include at least one solar cell. The shingle front includes at least one front conductive trace configurable such that when the shingle front includes a solar cell, the solar cell is conductively connected to the at least one front conductive trace in a series fashion. At least one of the back conductive traces is conductively connected to at least one of the front conductive traces. The back conductive traces and the front conductive traces are configured such that when the shingle is associated with a like shingle, the back conductive trace of the like shingle is conductively connected to the at least one front conductive trace of the shingle to be in a series fashion.

Abstract: A method for inhibiting growths on shingled roofs, one or more of the strips installed along shingle courses. The strips are preferably formed of copper and have an upper portion formed with a pattern of through holes along the length of the strip and pattern of dimples extending along a lower portion of the length of the strips to increase the duration and extent of contact of rain or dew with the copper metal to increase the release of cupric ions effective in inhibiting growths on the roof.

Abstract: A hip, ridge or rake shingle comprised of a plurality of panels sandwiched on each panel portion side of a layer of shingle material, such that each panel portion can be folded along a fold line, and wherein tabs are provided for each panel portion, adapted to be bent backwardly upon themselves, sandwiching thickening panels therebetween. The shingles can be laid up on a hip, ridge or rake of a roof, to yield desirable thickened features.

Abstract: A system for siding a building includes at least two siding pieces each including an end that abuts the other of the siding pieces, and a slip sheet. The slip sheet includes a lip that catches a top surface of at least one of the siding pieces. The slip sheet is positioned behind the at least two siding pieces and backing the abutting ends of the at least two siding pieces. The system also includes a trim flashing apparatus which further includes a trim portion that includes a visible surface and a surface to abut a portion of a siding piece, and a flashing portion attached to the trim portion. The flashing portion is sufficiently thin so that at least a portion of the flashing portion is covered by at least one of the two siding pieces.

Abstract: A shingle blank is provided including a substrate coated with an asphalt coating and including a first fold region, a second fold region, a third region, a lower edge and an upper edge. The shingle blank has a length. The first fold region extends substantially across the length of the shingle blank. The second fold region extends substantially across the length of the shingle blank and is positioned between the first fold region and the third region. A first perforation line is positioned between the second fold region and the third region. A second perforation line is positioned between the first fold region and the second fold region. The first and second perforation lines are sufficient to facilitate folding of the first fold region and the second fold region on top of the third region to form a three layered stack configured to be applied across a ridge or hip.

Abstract: A shingle and a method of making it is provided in which the rear surface of the shingle is provided with an attached reinforcement layer through which fasteners may be applied when the shingle is applied to a roof.

Abstract: The purpose of this new roofing idea is to increase the speed of the application of asphalt roofing. It is composed of a single roof shingle that is 51 feet long. The asphalt shingle is manufactured in two parts. The first part is 51 feet long by 1 foot high. It is a continuous shingle. The second part is 3 feet long with a 6×6 inch cut outs every 6 inches (see Diagram #1). The 3 foot long sections are glued on top of the 51 foot long shingle, forming a continuous finished shingle 51 feet in length. It is folded at manufacturing into three foot sections, left over right, forming a three foot long bundle (see Diagram #2). It is applied by nailing the first shingle to the roof. The bundle is then pulled open and laid flat across a 51 foot section of the roof (see Diagram #3). The shingle is nailed every eight inches. The process is repeated in layers leaving six inches of exposed shingle. Four bundles will equal one square of roofing.

Abstract: A composite roofing board is provided, including a layer of bituminous core material having pieces or particles of shingles, rolled roofing, etc. that have been broken-up or comminuted therein, with the core material having layers of mat material on opposite surfaces thereof, also in layers, and with an adhesive applied to an outer surface of one of the layers of mat material, with a peelable and removable release liner layer covering the adhesive. The various layers are provided as a sandwich, to make the composite board. A plurality of composite boards may be applied to a roof deck or other roof structure, and they can be butt-joined and taped together with a joint tape. The method of making the composite board can be continuous.

Abstract: A process for making a plurality of hip, ridge or rake shingles, and the shingles produced thereby and stacks and packages of such shingles are provided. An adhesive impregnated mat is moved longitudinally, and granules are provided onto adhesive, in predetermined bands. An overlay band of adhesive, continuous or discontinuous is provided, with granules thereon, increasing the thickness of the shingle material being made, in predetermined bands, relative to the remainder of the shingle material. The shingle material is slit longitudinally, and one portion can be laminated to another portion, preferably creating a multiple-ply laminated shingle material with thickened overlay portions and optionally with shadow line portions. The material is then slit longitudinally, and cut transversely into a plurality of hip, ridge or rake shingles, which may be individually separated from each other, or which may comprise a plurality of connected together shingles. The shingles are then stacked and wrapped.

Abstract: This invention relates to an underlayment for use under a plurality of courses of roofing shingles. The underlayment includes a water impermeable membrane layer containing at least one flap extending horizontally across the membrane layer. The flap is movable between a flat position and a raised position. In the raised position, an upper edge of a roofing shingle can be positioned under the flap. The upper edge of the roofing shingle can then be subsequently overlapped by the flap when the flap is moved into the flat position. The flap can then subsequently be overlapped by another course of roofing shingles.

Abstract: A method for installing siding panels to a building includes providing a foam backing board having alignment ribs on a front surface and a drainage grid on a back surface and then establishing a reference line at a lower end of the building for aligning a lower edge of a first backing board and tacking thereon. Tabs and slots along vertical edges of the foam backing board align and secure adjacent backing boards to each other. A siding panel is butted against one of the lower alignment ribs and secured thereto. Another siding panel is butted against and secured to an adjacent alignment rib to form a shadow line between the adjacent siding panels on the building.

Abstract: A solar insert for shingled roofs includes an insert with a generally wedge-shaped body designed to be installed beneath a shingle and a face that is exposed and extends along a lower edge of the shingle. The face preferably is angled with respect to the shingle and a solar collector in the form of a thin-film solar strip is mounted to and extends along the face. The inserts of multiple shingles are electrically coupled together to form an electrical grid for aggregating the electrical energy of the individual solar collectors and delivering it to a remote location for storage or use. In a second embodiment, a shingle has a solar collector strip mounted to its surface extending along a forward edge of the shingle, and in another, the solar collector surrounds the tabs of their shingles. The solar collectors not only generate electrical energy from the sun; they also enhance the appearance of a shingled roof by providing a look of increased thickness and texture.

Abstract: A tile having a self-interlocking mechanism urges rain water running on the surface of the tile to run downward thus making it for rain water to leak less through a joint. The tile includes a tile base, an underlap portion on each of an upper side area and one of a left-hand side area and a right-hand side area of the tile base, and an overlap portion on each of a lower side area and the other of the left-hand side area and the right-hand side area of the tile base. The tile may be arranged horizontally and vertically in a plain in a self-interlocking manner. The tile includes a tilt portion tapered thinner toward the lower end of the tile base.

Abstract: A roofing composition is formed as a shingle or from one or more separate sheets. The roofing composition includes a storage layer with an inert non-growing storage medium to absorb and detain precipitation for gradual release. The roofing composition reduces hydraulic discharge rates to avoid overloading downstream drainage systems.

Abstract: A shingle layer of shingle is provided having an increased thickness adhesive coating on at least a portion of its rear surface, with granules embedded therein, with the granules being of a size range that is larger than the fine particles normally applied to the rear surface of a shingle layer.

Abstract: A system, method, and apparatus for constructing and installing a roofing tile having an arbitrary design of color, patterns, textures, and the like in accordance with the requirements of a user, a designer, an architect, or the like, and provides an ability to select a color scheme for a base tile, variegations within the color of the base tile, as well as accent medallions having color, textures, and the like. Moreover, a texture may be provided to improve adhesion of the accent medallions to the base tile. In alternative embodiments, no texturing is required, but may be provided simply as a design element affecting shading in varied lighting.

Abstract: A wall covering comprising plastic molded wall panels and corner moldings each formed with simulated cedar shake shingles. The corner molding shingles are mountable in partially overlying relation to the shingles of adjacent wall panels and a previously mounted corner molding. The corner moldings further each have upper marginal edge regions that are positionable into tight fitting underlying relation to the wall panels in a course immediately above the corner molding for providing a more natural hand cut shake appearance. The corner moldings have mounting latches and hooks which are longitudinally severable to permit mounting on all surfaces that define corners substantially greater than 90°, and the corner moldings preferably are formed with different patterns of simulated shake for further contributing to their natural appearance.

Abstract: The present invention generally encompasses a starter block for use in the starter course of a roofing project to facilitate the subsequent positioning of shingles upon a hip roof without causing said shingles to substantially bend. The starter block has a tapered thickness, that is, the height of the front surface is greater than the height of the back surface. In one embodiment, the height of the front surface is about twice the height of the back surface. Otherwise, the starter block is generally rectangular. In one embodiment, the starter block is formed from a composite material, such as a combination of at least a polymer component (e.g. polyethylene) and a filler component (e.g., glass, stone, limestone), and includes at least one nib extending from each of its side surfaces and at least one nailing zone on its top surface.

Abstract: A board-type or log-shaped cementitious siding system, or a cementitious roof shingle system, having a reinforcement material contained therein, and an optional foam insert at least partially enveloped by a cementitious shell. Each system is molded from cementitious slurry, including gypsum cement and a latex/water mixture. A reinforcement material and an amount of the slurry are introduced into an open molding system or an alternative closed molding system, either molding system including a mold surface member having a face defining an exposed surface of the siding or roof shingle system. The slurry introduced to the mold surface member is to a desired depth and/or weight, or for a desired period of time. A foam insert is optionally introduced into the molding system. After sufficient curing, the siding or roof shingle system is separated from the mold surface member and is ready for immediate use and/or further processing.

Abstract: The present invention is an apparatus and method that enables a single installer to attach panels, such as drywall sheets, to overhead surfaces without the help of a second person to support the sheet against a ceiling while the installer performs the fastening. Two components are included, a fixed shelf and a movable shelf. Each component is elongated to support approximately half of the edge of the panels, so that the installer need not manipulate multiple brackets before securing the panels to the ceiling.

Abstract: The present invention relates to a roof cladding element, which roof cladding element has been manufactured of profiled plate material and which roof cladding elements are adjacently and in succession mountable such that the edges of a roof cladding element will be placed a distance overlapping with the edges of adjacent roof cladding elements. The present invention also relates to a method for manufacturing roof cladding elements in which method a plate material in strip form is formed into profiled roof cladding element strip with a forming device and in which method a finished formed roof cladding element strip is cut with a cutting device at even intervals into roof cladding elements. Characteristic to a roof cladding element in accordance with the invention is the fact that to at least one corner of a roof cladding element a recess reaching at least partly under the lower surface of the part of the roof cladding element surrounding the corner has been formed.

Abstract: A wide wall angle useful in locations of seismic activity to support ceiling tile and grid tees of a suspended ceiling comprising an assembly of an elongated base angle and an elongated extension strip, the base angle having generally perpendicular legs integral with one another and intersecting at a longitudinally extending corner, one leg being adapted to be fixed against a wall with the corner down, and the other adapted to project horizontally from the wall, the extension strip having a face with greater than the width of the horizontal leg, the extension strip having a multiple layer construction, two layers of the extension strip being held together in close parallel relation by an intermediate web integral with the layers, at least portions of the two layers being arranged to frictionally engage at least a part of the horizontal leg of the base angle spaced from the corner such that the strip can be assembled on and frictionally retained on the horizontal leg of the base angle, the horizontal leg of th