Abstract: A bitumen-based waterproofing membrane is provided with an improved edge for sealing with a contiguous membrane to provide a membrane system with improved waterproofing characteristics. A bitumen-based reinforced membrane sheet is coated with granular material to protect the membrane sheet from ultraviolet rays. However, a section of the membrane sheet is first covered with a piece of protective tape which prevents any granular material from being deposited on the lateral section of exposed bitumen beneath the tape. The membrane sheets are then cut immediately prior to the tape or at the edge of the granular coating and then rolled up. Accordingly, the lateral section of bitumen which is covered by the protective tape is on the innermost part of the rolled-up membrane sheet. During installation, the tape is removed and the exposed bitumen or selvage section is disposed below an adjacent or contiguous membrane. Heat is then applied for an easy and effective seal between two adjacent membrane sheets.

Abstract: Sheet metal multiple stepped tile panels are joined to similar roof panels in interlocking relationship. On one edge running the length of the panel is a single female groove while the opposite edge of the panel has a plurality of male members which can engage the single groove of a similarly shaped panel. The stepped panel is quite long compared to its width. Hidden screws in a securing flange join the panel to a roof.

Abstract: An extruded roof tile (30) has an upper surface (11), which is contoured to give the appearance of a profiled tile and which is, for example, provided by projections (32, 34) extending between the upper and lower edges (13) and (14a) respectively of the tile, and an under surface (12) having a shape which is other than a contoured shape which generally follows that of the upper surface (11) of the tile (30). For example, the under surface (12) may have a shape which corresponds to that of a flat tile.

Abstract: An interlocking roof system of tiers of successively higher interlocking panels mounted on base members, each panel being held in place by protrusions fitted into notches in the base member of the next higher tier, the panels of each higher tier having a groove wrapped about and locked onto a lip of the adjacent lower panel, side lips and clips being used to connect adjacent panels located in the same horizontal tier. The base member of the lowest tier is mounted at its lowest edge on a riser along the lowest edge of the roof being covered and at its upper edge on the rafters of the roof being covered. The next lowest base member is located at its lowest edge along the upper edge of the adjacent lower base member and at its upper edge on the rafters.

Abstract: An apparatus and method is provided for applying building panels, such as siding panels, to building surfaces, such as walls. The panels are of a type which undergo expansion and contraction due to changes in temperature, and they are applied to a building surface, such as a wall, by means of nails, screws, staples or the like. In order to accommodate the expansion and contraction of the panels, the panels are provided with an attachment hem, such as a strip of relatively flexible material, generally rubber-like or fabric-like in nature. A strip of relatively flexible material may be secured to the relatively rigid building panel by any suitable means, such as adhesive securement, welding, heat fusing, etc., such that it becomes an integral part of the building panel, or the relatively flexible attachment hem may comprise a separate component which, when applied to a building surface, such as a wall or the like, by a suitable nailing, stapling, etc.

Abstract: An angled roofing shingle for a roof ridge line is made from an organic, resinous material and a filler material. The shingle has a first elongated portion and a separable, second elongated portion. These two portions each have a longitudinal edge provided with a mating edge surface and are joined together at an angle less than 180 degrees so that the shingle can cover and conform to the ridge line. Means are included for moving the first and second elongated portions relative to each other to change the angle of the shingle to accommodate a variety of angles of ridge lines.

Abstract: A roof shingle has parallel top and bottom marginal edge portion which are turned inwardly of a central area and are interengageable with like bottom and top marginal edge portions, respectively, of like roof shingles. The shingle further comprising, at each side thereof, an upper side marginal edge portion and a lower side marginal edge portion, which are inclined relative to said parallel top and bottom marginal edge portions, respectively, so as to converge with one another; and are interengageable with like lower and upper side edge marginal portions, respectively, of like roof shingles.

Abstract: A system for covering an exterior surface of a building comprising a plurality of members for application to the building surface in a series progressing from one end of the surface to the other end in a first lengthwise direction. The system comprises at least two such members adapted to overlap in use, one of the members having, in the overlapping zone thereof, a first type connector comprising a lock formation defining a recess opening generally in the first direction. The other member has, in its overlapping zone, a second type connector comprising a hook formation having a free end projecting generally in the second lengthwise direction and into the recess in use.

Abstract: A fully interlocking roof shingle for installing a weather-proof roof on a building. The shingles are constructed of multiple layers to expose various interlocking grooves for connection to the contiguous shingle. The interlocking grooves have a dovetail configuration to ensure secure connection of the shingles to form a substantially integral roofing system. The individual shingles include a bottom plate with a plurality of grooves disposed upwardly and a top plate with a plurality of grooves disposed downwardly. The grooves of each plate mate to form the assembled roofing shingle exposing a decorative top surface and a base surface of the upper and lower plates respectively. The plates are assembled in an offset manner so as to expose upwardly disposed grooves along two edges and downwardly disposed grooves along the other two edges. As a result, the shingles may be assembled on the roof by interlocking the grooves of the shingles.

Abstract: A plastic siding panel which includes an upper connector, a medial main portion, and a lower connector. The connectors are complementary in shape so that they interlock with other siding panels of like construction. At least one of the connectors include a strip of high strength material for rigidifying the siding panel. The siding panels are fabricated by extruding a monolithic, substantially planar sheet composed of three different materials. Two of the materials are formed as layers which extend over the entire sheet. The third material is a high strength material adapted to rigidify the siding panel. After extrusion, the sheet is formed into a siding panel having a main portion, an upper connection and a lower connection.

Abstract: The present invention provides a shingle for covering a roof or other surface. The shingle has an integral heat shield for shielding the roof from direct solar radiation. The shingle is substantially L-shaped when viewed from above and comprises two main parts, a shingle portion that is fastened to the outer surface of the roof in the usual overlapping courses, and a heat shield portion projecting upwards from the plane of the shingle portion. The heat shield portion extends over a part of an adjacent shingle, shading the shingle. The heat shield portion also provides an air passage with open top and bottom ends allowing air flow under the heat shield thereby preventing a heat build-up beneath the heat shield.

Abstract: Flat-rolled sheet metal is manufactured to preselected gage, mechanical properties and surface finish and is fabricated into unitary sheet metal shingle structures with interlocking folded over sheet metal layers providing for ease of assembly and weatherproofing along each side of a rectangular configuration portion which remains exposed after assembly of shingle structures in side-by-side interlocked relationship in a horizontal direction, and in overlapping partially-covering relationship in a vertical direction. Galvanized mild steel provides lightweight, high-tensile strength, impact-resistant and long-service-life shingle structure. Finish coating enables selection of coloring and thermosetting polymeric coatings facilitate embossing of exposed portions to simulate the appearance of cedar shakes or other types of shingles.

Abstract: Siding panels for covering the exterior wall of buildings mutually define a tongue and groove interfit which facilitates installation by placing the weight of an upper panel on an underlying lower panel instead of requiring an installer to hold the panel in place against gravity. Mounting nails are used in combination with the tongue and groove interfit to positively lock the tongue of one panel into the groove of the underlying panel. Nail placement is controlled by the relative placement of nail slots and hammer abutment surfaces formed on each panel. Because the panels must be pivoted in place and held in place by the overhanging siding nails, it is virtually impossible for the installer to make a mistake that results in an upper siding panel coming loose from the siding panel below.

Abstract: A rectangular roof element is provided in the form of a sheet-like material which is bent back towards an upper surface thereof at an upper edge to provide a first hook and which is bent back towards an opposite lower surface at an opposite lower edge to provide a second hook. One side edge includes a gutter and an opposite side edge includes a stepped portion. The hooks, gutter and stepped portion are configured such that a plurality of similar roof elements may be joined together by mating first and second hooks of respective adjacent roof elements, and also mating gutters and stepped portions of respective adjacent roof elements.

Abstract: A shingle is formed with a first, or trailing, side edge folded over toward the top surface of the shingle to catch moisture and direct it down to the top surface of the next lower shingle. A second, or leading, side edge of the shingle is not folded. An "S" shaped fold, spaced apart from the trailing edge fold, receives the unfolded leading edge of an adjacent shingle. The trailing edge and S fold form a gutter under the leading edge of the adjacent shingle. The top edge of the shingle is folded-over toward the top surface of the shingle for engagement with the folded-under lower edge of the next higher shingle. The folded-over top edge extends to the right or leading edge of the shingle and slides under the left edge of the folded-over top edge of the next adjacent shingle to the fight side. The folded-under lower edge extends along the lower edge of the shingle but leaves a gap relative to the folded-under lower edge of the lateral adjacent shingle.

Abstract: A sheet roofing system involving the use of a plastics material membrane may be applied over existing metal roofs. A plastics material extrusion which may be colour matched or contrasted with the colour of the plastics material membrane may be applied over standing seams or other ridges. The extrusion is a U shaped cover, of which one leg is hinged for easy installation of the cover over the standing seam. The hinge is designed to avoid undue stresses on the plastics material of the cover. In one embodiment, the hinge is a hollow tubular region along the length of the extrusion between the leg of the U and the web of the U which forms the top of the cover.

Abstract: Siding having members which give the structure to which they are attached the illusion of construction from wooden logs. Other accommodating features, such as half and quarter panels, allow attachment to a building having commonplace irregularities, for example, doors and windows. The structures disclosed herein also provide for the inclusion of additional insulation, for attachment of the siding members to each other, and for attaching the siding to a building.

Abstract: Exterior finishing panels are provided which contain an elongated, thermoplastic sheet which is supported by a rigid support member disposed along a portion of the length of the sheet. The rigid support member has a flexural modulus which is significantly greater than the modulus of the thermoplastic sheet, so as to support the panel during handling and installation. The panels of this invention will be more kink-resistant, and will ride uneven walls better to present a flatter-looking finished wall surface. These panels are also capable of being worked with ordinary hand tools, such as a standard wood saw made of steel or carbide.

Abstract: A composite roofing element comprises a first layer of aggregate based material, a second layer of material having a density less than that of the first layer and has a wedge shaped region depending from its underside. The wedge shaped region is preferably integral with the second layer which can be made of an expanded polymer, expanded polystyrene being particularly suitable. Overlapping structure on the side edges and a recess in the thick end of the wedge enable adjacent elements to interlock with each other. By using such lightweight roofing elements the requirement for a substantial load bearing supporting structure is reduced.

Abstract: Exterior finishing panels are provided which contain an elongated, thermoplastic sheet which is supported by a rigid support member disposed along a portion of the length of the sheet. The rigid support member has a flexural modulus which is significantly greater than the modulus of the thermoplastic sheet, so as to support the panel during handling and installation. The panels of this invention will be more kink-resistant, and will ride uneven walls better to present a flatter-looking finished wall surface. These panels are also capable of being worked with ordinary hand tools, such as a standard wood saw made of steel or carbide.

Abstract: A composite weatherboard having a timber member and a metal exterior sheath. The sheath is extruded with longitudinal projections which are fitted and pressed into permanent engagement with corresponding grooves or tongues provided in the timber member thereby obviating the need to use an adhesive or other fastener.

Abstract: The present invention provides an interlock assembly for joining adjacent building panels, said assembly comprising:(a) a pair of interlock assembly elements, each assembly element having integral therewith:(i) first complementary means for matingly engaging the assembly elements in an engaged position; and(ii) second complementary means for forcing and maintaining the first complementary means in the engaged position, wherein said second complementary means are separate and disposed away from said first complementary means.

Abstract: The modular roof structure includes a grid system with a plurality of parallel beams and a plurality of roof tiles provided on the parallel beams in an overlapping manner. The parallel beam has an engaging protrusion that projects upward. The roof tile has a front end that is provided with a hook portion to receive the engaging protrusion of the parallel beam, and a rear end which is provided with a projection to abut with the hook portion of an adjacent roof tile and a covering member which shields the hook portion from rain and sunshine.

Abstract: Invisible junction device, particularly for stretched cloths, includes a support (1, 1') for securement to a ceiling or a wall, profiles (2) for the reception of securement pads, disposed in the support (1), and an element (3) for partial or complete closure of the support (1) by pinching. The support (1) is preferably in the form of a profile provided with a surface bearing against the existing ceiling or wall or for securement on an intermediate support, and two longitudinal profiles (2) adapted to coact with securement pads of the corresponding edges of the sheet or sheets to be stretched, at the joint to be provided, the profiles (2) extending parallel and symmetrically with a slight inclination relative to the vertical, their external edge being aligned with the edge (4) of one of the sides of the support (1), while the other edge extends beyond the first in a ridge (5) in prolongation of the external edge of the corresponding profile (2).

Abstract: A lightweight roofing shingle or tile having an elongated body with top and bottom surfaces that taper lengthwise of the body, the body having laterally spaced, elongated edges; the body having a mid-region and a recess sunk upwardly into the mid-region, from the bottom surface; the recess extending widthwise of the body to intersect the body laterally spaced edges whereby the recess is adapted to receive a batten to support the body mid-region when installed on a roof. A secondary taper on the tile bottom surface engages the roof to provide leverage resisting wind up-lift forces exerted on the lightweight tile acting to rotate the tile about a nailing point fulcrum.

Abstract: A watertight and fire proof system for covering a roof is provided which comprises a plurality of tile elements which interlock in a horizontal direction relative the roof. The individual tiles can be interlocked and oriented relative each other to enable the selectable displacement of adjacent tile elements along a sloping direction of the roof which is perpendicular to the horizontal direction. An upper edge of a first one of the adjacent tile elements can be positioned at a different slope level of the roof relative an upper edge of a second one of the adjacent tile elements. Orientation of a first tile element relative a second tile element in the sloping direction is limited by contact between a lower flange of the first tile element and the abutting edge of the second tile element.

Abstract: Tile plates of standard roofing tile dimensions can engage over opposite edges of photovoltaic modules mounted on these plates to form roofing assemblies. The photovoltaic modules preferably are frameless and are anchored by formations on their edges to formations along grooves of the tile plates receiving them.

Abstract: A panel of curtain wall with an air-tight system, which is placed in position before the panel is installed, has an outer air-tight barrier and an inner air-tight barrier, one of which consists of a U-shaped profile with asymmetrical lips, the shorter lip being on the outside of two adjacent sides of the panel, the longer lip being on the outside on the other two sides.

Abstract: A solar energy collector device is disclosed for selectively collecting an electrical energy and a thermal energy at the same time from a solar energy. The device comprises an inorganic-and-metal composite in the form of a roof tile or a wall-forming member which includes a solar battery exposed to sun rays and a heat medium passageway disposed underneath the battery. The density of distribution of a particulate inorganic substance within a metal mass is varied through the areas of the tile or wall member so as to effectively collect the respective energies without adversely affecting the interior conditions of a building in which the device is installed.

Abstract: A roofing structure includes a series of overlapping, interlocking panels, each of which has a small ridge and a large ridge at opposing edges of the panel. The large ridge of each panel overlaps a small ridge on an adjoining panel, but the ridges are sized and spaced from one another to interrupt capillary movement of water between them. Each panel is fastened to a roof board using a noninvasive fastener which fits within a groove in the upper surface of each panel. The fastener can slide relative to the groove to allow expansion and contraction of the panel without buckling or breaking.

Abstract: A lap board type of corner structure which comprises a series of panels on opposite sides of a corner wherein one set of panels on one side of the corner have end corner-overlapping hook-shaped portions interlocking with similarly shaped end portions on the other set of panels on the other side of the corner.

Abstract: A metallic panel for use in a roof, for example, is disclosed. It comprises a part (second part) destined to be left exposed even after the metallic panel is overlaid by another metallic panel and a part (first part) destined to be overlaid by the second part of the other metallic panel. The boundary between the first part and the second part is so constructed as to be joined fast to the lower edge of the second part of another metallic panel. The metallic panel is provided along the edge of the first and second parts respectively with a rising rib formed by bending the edge in an upper inward direction and a falling rib formed by bending the edge in a lower inward direction. It is further provided on the surface of the first part with a plurality of oblong reinforcing protuberances arrayed parallelly in the vertical direction.

Abstract: A roofing plate for the planting on greenery on a roof, having an approximately rectangular surface as seen from above. The roofing plate comprises a wedge-shaped upper section tapering in thickness towards the ridge, a central section of uniform thickness and of a lower section with an open channel on top. The combined length of the central section and the lower section (measured in the direction of the ridge to the eaves) is greater than the length of the upper section, so that a scale-like double or multiple roof covering can be installed. Several rows (25, 26) are installed one above the other, whereby a plurality of open channels are formed, and are located one above the other, are filled with a nutritive medium (35) for the planting of greenergy (36). Shell sections (32) are preferably inserted into the channels and hook into each other by means of beads and creases (33) so as to form a strong, sealed connection.

Abstract: A building panel which can be fabricated on site to any desired length, comprising a continuous strip having two mutually interlocking edge structures running the full length of the panel, one edge structure being adapted to be fastened to the underlying roof and including an outer flange with spaced slots through which a nail or screw can be used to fasten the panel, an upwardly projecting lengthwise first ridge with a rounded upper portion, an S-shaped recess spaced inwardly from the first ridge and running lengthwise of the panel, and the other edge structure including an outer flange adapted to be inserted into the S-shaped recess of the next adjacent panel, and an upwardly projecting lengthwise second ridge adapted to overlie the first ridge of the next adjacent panel.

Abstract: In wall siding panels having vertical edge portions adapted to overlap, fasteners prevent the vertical joint so formed from bending or bulging outwardly. The panels have declinations and flat lengthwise, horizontal shoulders joining the declinations to resemble clapboard finishing. A female aperture is formed in each shoulder of one panel adjacent its vertical edge portion, and a male projection is formed in each shoulder of the other panel adjacent its vertical edge portion. When a pair of two longitudinally-spaced, oppositely-directed projections are provided, which are selectively used so as to permit panel overlapping in any order edge portions are overlapped, each projection elements have identical profiles.

Abstract: The invention concerns an extruded concrete roof tile of the kind which is designed to be laid in broken bond, is generally rectangular in plan view and has underlying and overlying side lock portions at opposed edges respectively. The upper surface of the tile at the upper end thereof, when on the roof, is recessed to receive the side locks of two similar upper tiles laid in broken bond, and the underlying side lock portion is cut away at the lower end of the tile so that the lower end portion of the tile may lie over the upper surface of the tiles down the roof (in use) to extend beyond the said recessed portions of the lower tiles. The recessed portion is arranged to receive the tile hanging nibs of an identical tile when the two tiles are stacked one upon the other.

Abstract: A tile formed from a relatively thin sheet is adapted to cooperate with similar tiles to form a tiled surface. When the tile is installed, the central axis thereof coincides with a line defining free water flow down the tile between upper and lower tile portions. The tile has first and second raised ribs extending symmetrically as mirror images of each other on each side of central axis. Each rib has upper and lower rib portions which are interconnected so as to extend continuously between the upper and lower tile portions to increase stiffness of the tile. The upper rib portions are generally complementary to the lower rib portions so that the lower rib portions of an upper tile can fit over upper rib portions of a lower tile. Thus rib axes of upper and lower rib portions are also mirror images of each other about a lateral axis disposed perpendicularly to the longitudinal axis. The tiles are effectively secured in four places to increase resistance to movement.

Abstract: A reinforced siding panel comprising, in combination, a metal sheet having interior and exterior surfaces and a contoured plastic sheet adhesively bonded to the interior surface of said metal sheet, wherein said plastic sheet includes a first regular pattern of protruding surfaces bonded to said interior surface of the metal sheet from said interior surface of the metal sheet. The plastic sheet provides greater rigidity to the panel while reducing the weight of the panel compared to a thicker metal sheet.

Abstract: The present tile is adapted to cooperate with similar tiles to form a tiled surface, and is formed from a relatively thin sheet having a periphery disposed symmetrically about a central axis. When the tile is installed the central axis coincides with a line defining free water flow down the tile between upper and lower tile portions. The tile has first and second raised ribs extending symmetrically as mirror images of each other on each side of the central axis. Each rib has upper and lower rib portions which are interconnected so as to extend continuously between the upper and lower tile portions to increase stiffness of the tile. The stiffened tile is better able to resist weight of a person walking on the roof, and also resists a tendency for the lower portion of the tile to lift when wind blows onto the roof. The upper rib portions are smaller than, and complementary to, the lower rib portions so that the lower rib portions of an upper tile can fit over upper rib portions of a lower tile.

Abstract: Decorative wall covering panels are disclosed which sealingly fit against a wall and thereby protect the wall surface from the deteriorating effects of weather. Horizontally and vertically abutting panels which simulate real shingles, such as cedar shake shingles, overlap each other on all edges when installed. Sealing surfaces are provided around the periphery of the inside surface of the panels. The fitting arrangement of the overlapping edges between panels serves to make and maintain the seals between the panels and the wall.

Abstract: A surface covering extruded plank comprising a wall surface portion having opposed transverse end walls. Each of the end walls terminate in a support flange each of which extends in a common plane substantially parallel to the planar surface of the wall surface portion. One of the transverse end walls has a fastener concealing wall extending transverse thereto and above the wall surface portion. The other of the end walls has a plank securing flange constituted by an extension of one of the support flanges. This other end wall further has a recessed portion disposed inwardly of an edge portion of the wall surface portion. A guide rib is provided in the recessed portion and defines a rear channel for receiving a portion of the concealing wall of an adjacent plank, and a front load connector holding channel.

Abstract: Thermal insulation is prepared from a series of insulative elements capable of being interconnected with each other, and a series of protective sheet elements which when fitted over the insulative elements protect the insulative elements from the environment.

Abstract: Roof system including a plurality of shingled generally wedge shaped roof members. Each roof member has a long rectangular shape with tile markings on the upper forward surface. The generally wedge shaped roof members include a relatively planar upper surface except for an upward projecting flange that leans forward toward the forward side of the roof member. The lower surface includes a first converging planer lower surface portion extending beyond the position of the upper flange of a shingled lower roof member. The lower surface includes a second converging planer lower surface portion that ends in a rear edge. A border area between the first portion and the second portion is of increased thickness. A mating flange groove is located in the first portion which is arranged and sized to mate over the upper flange and rear portion of a lower shingled roof member.

Abstract: A facing material for a building is disclosed which is capable of effectively and readily carrying out the lateral connection between facing materials as well as the vertical connection. The facing material comprises a flat plate body which is formed at both side ends thereof with a side fit-in section and a side fit-on section which are adapted to be readily securely fitted with respect to the side fit-on section of a first laterally adjacent facing material and the side fit-on section of a second laterally adjacent facing material opposite to the first one. Also, a method for vertically and laterally connecting facing materials together is disclosed which is capable of readily forming an outer face of a wall or a roof of a building.

Abstract: A corrugated sheet roof panel has one longitudinal edge formation and one marginal strip of the panel which has a width less than the pitch distance between adjacent corrugations where the edge formation includes a female receptive bead. The opposite longitudinal edge formation of the panel includes a second marginal strip of the panel where the formation includes an inverted U-shaped male bead. The male bead of one panel is adapted to be snapped into the female bead of an adjacent panel to lock adjacent panels together.

Abstract: A wall construction for use as an outer wall, a roof or the like in an architectural structure is disclosed which is capable of effectively accomplishing sound absorption and insulation and heat insulation. The wall construction includes a first coat member of sound absorbing and heat insulating properties disposed on a base member and a sheathing member of sound and heat insulating properties spaced through a support member from the first coat member to define a space therebetween.

Abstract: A panel assembly for the in-situ production of a standing seam roof has panels which, at one end, have a vertically standing hook formed atop a semi-trapezoidal fold, while at an opposite end, a vertically standing hook is formed atop and is part of a substantially trapezoidal fold. The first hook is designed to be simply and securely retained within the second hook through the use of a camming interlocking action and the free edge of the second end is upwardly bent so as to rest against the semi-trapezoidal fold of a like panel joined to said end to form a series of interconnected panels that are mounted to roof purlins by fasteners hidden by the standing seam. In a roof requiring plural parallel series of panels, upper and lower clamping bars are provided to form a tight, leak-proof lap joint between the adjacent panel series in a manner avoiding the need for the use of exposed fasteners which must extend through exposed roof portions.

Abstract: Rectangular panels, such as standing seam roof panels, which have upstanding flanges or seam sections extending along two opposed longitudinal side edges are stacked in a nested relationship. Each panel in the stack is transversely bowed about its longitudinal axis to spread the upper edges of the upstanding flanges or seam sections apart by a distance sufficient to permit the next uppermost panel to be nested between the flanges or seam sections of the lower panel. A longitudinal support member is located under the longitudinal centerline of the lowermost panel of the stack to support that panel in its bowed position. The support member and panel stack are in turn supported on a rigid, flat support base, and straps passing transversely around the support base and panel stack bind these elements into a unitary package for shipping or storage.

Abstract: An end lap seam construction for metal roof panels in a standing seam roof is provided wherein a continuous water-tight seal extends around the entire periphery of each panel. Mating factory installed mastic strips are employed to seal the standing side seams of adjacent panels. The end lap seam of the present invention incorporates a mastic tape which may be field-applied without any great degree of precision to mate with and bond to the side seam mastic strip of an overlapping mating panel.

Abstract: A plastic building panel having a thermoformed face and a thickened upper edge. The upper edge has a flange forming a downwardly facing U shaped opening. A flange at the bottom edge of the panel forms an upwardly facing U shaped opening. The panel is formed by first thermoforming a sheet of plastic and then heating along longitudinal fold lines near the edges of the panel and folding the edges along the fold lines to at least partially form the finished panel.