Abstract: A structurally reinforced, pre-fabricated and modular chimney facade system (10) is provided for enclosing a chimney stack (12) passing therethrough. The chimney facade system (10) is adapted to be secured to an external wall (16) of a building structure (14). The chimney facade system (10) includes a first one-piece base housing (22) and at least a second one-piece base housing (24) adapted to be mounted to base foundation housing (26). Facade system (10) includes a structural support mechanism (36) for at least the first and second one-piece base housings (22 and 24) for coupling each to the other and for coupling the combination to the building structure (14). The structural support mechanism (36) includes a mechanism for adjustably applying a force loading between the external wall (16) of the building structure (14) at least the combination of the first and second one-piece base housings (22 and 24).

Abstract: A reinforced concrete wall, such as a road barrier or barricade, has a monolithic surface ornamentation thereon constituted by pigmented cements and grooves simulating mortar joints. In the horizontally oriented top portions of the wall where the pigmented cements are substantially thicker than the layers of pigmented cements monolithically joined to the vertical oriented portions of the wall so that these portions, which are subject to chipping and the like during handling and use will retain their aesthetically pleasing appearance. In the molding process, ribs on the mold surface which will form the grooves have a retardant applied thereto so that the cement forming the mortar joint will set at a slower rate than the rest of the body of the concrete wall and when removed from the mold can be brushed. When the wall is in the form of a road barrier, the ends are provided with a conical projection and a conical recess, respectively, to provide coupling between adjacent wall units.

Abstract: A decorative wall panel is described which includes a reinforced base layer and a patterned top layer. The top layer comprises Portland cement, sand, and pigmented binder. The top layer is slow-cured and exhibits compressive strength of at least 1500 p.s.i. and high temperature color fastness. The top layer is firmly bonded to the base layer. The decorative panel can be made very thin and is self-supporting. It may be adhered to any desired wall substrate, for example, with adhesive, nails, screws, or other mechanical fasteners.

Abstract: The paving stone comprises a recess which divides the stone into an upper part having a smaller circumference and a lower part with a greater circumference. The lower part, having also a greater height than the upper part, comprises a ribbing or other vertically oriented interlocking means and the upper part can have the appearance of a natural stone. The shape of either the upper or the lower part may be chosen arbitrarily and independent from each other. The molding box for the manufacturing of such paving stones is made of two pieces joined together and comprises the corresponding recess. The lower piece comprises an insert for forming interlocking means.

Abstract: An insulated window panel is provided with pseudo sash bar lattices that are affixed, preferably by dual-sided adhesive foam tape, in coincidental alignment to the outwardly facing transparent surfaces of the panel. Dual-and triple-glazed window panels constructed in accordance with the present invention have the appearance of being constructed of a plurality of small panes or panels that are surrounded and held in planar array by sash bars. The resemblance to French-style windows is achieved by means of a remarkable trompe l'oeil effect that results when pseudo sash bar lattices are affixed in coincidental alignment on opposite sides of the panel. Also disclosed is a novel triple-glazed insulated panel wherein the insulating peripheral seal is protected by providing a central pane with slightly reduced height and width dimensions relative to those of the two outwardly facing panes.

Abstract: A transparent enclosure for automatic metal shaping machinery effective to contain cutting fluids, chips, shavings, broken tools and the like having a smooth planar interior wall surface for shedding readily chips, fluids and other matter striking the wall during the course of machine operation.

Abstract: A pre-fabricated and modular chimney facade system (10) is provided for enclosing a chimney stack (12) passing therethrough. The chimney facade system (10) is adapted to be secured to an external wall (16) of a building structure (14). The chimney facade system includes a one-piece base housing (18) which is adapted to be mounted to a base foundation member (20) and to the external wall (16). The base housing (18) is vertically aligned with and coupled to a transition housing (44) which is fixedly secured to the external wall (16) of the building structure (14). Additional housing members are modularly coupled to the transition housing (44) to provide a complete enclosure for smoke stack (12). The housing (18, 44) as well as additional housing units (74, 102) and cap housing (120) are formed in one-piece formation and generally molded of a plastic composition. In this manner, there is provided a lightweight easily assembled chimney facade system (10).

Abstract: A building panel for surfacing exterior and interior wall and roof structures comprises an outer shell formed of relatively thin, molded hardboard material having upper and lower edges, opposite ends, a molded outer surface adapted for exposure to the weather and a back surface. The shell is formed with a cross-sectional profile extending transversely between the upper and lower edges comprising a lower edge portion extending upwardly and outwardly of the lower edge of the panel and a back plane of the panel joining an intermediate portion which is spaced outwardly of the back plane. A row of fastener receiving depressions is formed along an upper edge of the intermediate portion and these depressions have a base spaced inwardly of the surrounding surface with a back face of said depression bases lying substantially on said back plane. The profile further includes an upper edge portion above the row of fastener receiving depressions which terminates along the upper edge of the panel.

Abstract: Decorative facing and method for applying same are described. The facing comprises Portland cement, sand, and pigmented binder. The facing may be applied to various surface or molded into individual elements of various shapes and thicknesses. The facing is slow-cured and exhibits compressive strength of at least 1500 p.s.i. and high temperature color fastness.

Abstract: Modular interlocking paving elements of uniform configuration are provided each in the form of a substantially right angular body bounded peripherally by two outer sides meeting at an outer angle apex, two inner sides meeting at an inner angle apex and two front sides each extending between respective ends of an inner side and an outer side, with dummy joint gaps formed in and extending across the top side of the body each from the inner angle apex to a midpoint of one of the outer sides. The inner sides, front sides, half sections of outer sides and dummy gaps are of substantially the same length, and each has longitudinal portions thereof projecting outside and/or recessed inside a straight base line between the ends thereof, so that the top side of each element appears to be composed of three four-sided elemental units disposed side by side and two or more of the elements will interlock laterally yet present the same surface appearance in any of a variety of side-by-side orientations.

Abstract: Disclosed is a constant contact panel interlock even during thermal expansion and contraction by providing flexible pins to bear on a tongue in a tongue and groove interlock and also by providing ramps for a bendable flange to slide over and bear on. Further, a material made of polypropylene with 20% calcium carbonate filler is used to form the panels, such material being sufficiently flexible at the temperatures common for panels exposed to direct sunlight (as on a roof or wall) to permit the pins or flange to bend without breaking and also being a material of much lower coefficient of expansion than pure polypropylene.

Abstract: A simulated clay tile roof construction is provided which includes a plurality of roof panel members which are each formed to simulate the appearance of a plurality of clay roof tiles. To minimize the weight and ease the assembly of the roof panel members, they are provided with cut-out sections at diagonally opposite corners. To optimize the strength and minimize the weight and cost of the panel members, they are constructed by molding with an upward facing weather resistant gellayer over the entire surface, with an underlayer of fiberglass reinforced gypsum over a majority of the surface thereover, and with a high strength underlayer of fiberglass reinforced plastic along the lateral edges thereof. A method of making the roof panel members is also proposed, including applying the fiberglass for the gypsum layer while the underlayer is still wet, applying the gypsum to the fiberglass layer, and then rolling the layers to mechanically bond the same together.

Abstract: A leaded came type window wherein the basic window pane is continuous, the ornamental lites are laminated to the basic pane, the ornamental lites are of substantial thickness, and the came is a channel member with its edges conformed to the marginal areas of the lamination.

Abstract: Concrete building panels include a decorative embossed pattern on an outer surface. A plurality of concrete reinforcing ribs are disposed along an inner surface of the concrete building panels. Nailing strips are anchored into tips of the respective concrete reinforcing ribs. A method for making the building panels include a step of placing anchored nailing strips into tapered rib sections of a horizontal fiberglass mold is disclosed wherein reinforcing bars and mesh and moist concrete are placed into the mold and allowed to cure until the exposed upper surface of the moist concrete is plastically deformable. The horizontal mold is passed beneath a rotating embossing roller having a cylindrical embossing pattern thereon. The plastically deformable concrete contacts the embossing pattern, producing a complementary pattern on the concrete surface. The embossed concrete is cured in the mold to produce the building panel. The concrete building panel is then separated from the mold.

Abstract: A building panel of wood composite material includes inner and outer faces outlined by opposite ends and upper and lower edges. The panels are adapted to be placed end-to-end in courses or rows arranged in parallel to extend upwardly from a lower edge or eave to cover a building wall or roof structure. Each panel includes an outer face having a lower portion of substantial surface area adapted for exposure to the weather and an upper portion of relatively smaller surface adapted to underlie one or more panels in a next higher course laid in overlapping relation therewith. A large lower portion of the outer face is formed with a surface embossed to resemble a plurality of individual shingle elements positioned in side-by-side relation. Grooves are formed in the outer face of the panel between adjacent shingle elements and each groove tapers from a minimum depth adjacent the upper portion of the outer face to a maximum or greater depth adjacent the lower edge of the panel.

Abstract: A building panel having inner and outer faces outlined by opposite ends and an upper and lower edges has opposite ends adapted to closely face the end of an adjacent panel in the same course. The outer face of the panel includes a lower segment of substantially greater surface area adapted for exposure and an upper portion of relatively smaller surface area adapted to underlie a lower portion of one or more panels in a next higher course laid in overlapping relation therewith. One of the ends of said panel includes an overlap end segment adapted to overlie an underlying end segment at the other end of an adjacent panel laid up end to end in the same course to form a ship lap end joint between the panels. The overlap end segment includes a marginal end portion of the outer face with an underside therebelow formed to slope from a minimum panel thickness adjacent the upper edge toward a maximum panel thickness adjacent the lower edge.

Abstract: A modelling method comprises building up walls 10 or like structures of individual wooden blocks 11 representing bricks and cardboard strips representing bed joints 12 and cross joints 13.A model kit comprises such blocks and strips.

Abstract: A concrete core for masonry having an upper portion with vertical surfaces on a flat top surface and a lower base portion which forms a supporting shelf about the bottom periphery of the upper portion. The invention also includes a finished masonry structure having a plurality of masonry elements supported on the ledge of the core and covering the horizontal surfaces of the upper portion of the core.

Abstract: A suspension ceiling or wall system is disclosed providing a plurality of spaced, rectangular pans or projections positioned in spaced relationship in a pattern to provide a ceiling or wall surface with the appearance of a plurality of such pans suspended in space. The pans are formed from sheet metal into elongated members having a plurality of pans supported by integral, longitudinally extending rails. The rails are provided with a dark color contrasting with a relatively light color on the exposed portion of the pans so as to obscure the presence of the connecting rails.

Abstract: A brick panel wall construction is disclosed including a backing board for a brick panel which is formed of extruded plastic foam for moisture resistance and insulation. The wall construction includes a plurality of brick panels having plastic foam backing boards and a plurality of load bearing clip members that support the bricks which are secured to the backing boards. The load bearing clip members are sandwiched within the tongue and groove joints between adjacent upper and lower brick panels. Each load bearing member includes a protruding terminal lip that extends into the joint area between the bricks of adjacent panels. Mortar is packed or tuck pointed into the joint area to cover the protruding lips of the load bearing clips, and the clips become the support for the bricks that are secured to the plastic foam backing boards.

Abstract: Interlocking panels having a decorative pattern thereon and having a system of interlocks for providing a weatherproof covering system for use as roofing, siding and the like. The panels may be of a readily formed material such as a thermoplastic having a decorative pattern thereon complimentary to the pattern on adjacent panels to provide a continuous decorative roofing or siding panel system. The panels have a simple hook-like region adjacent the upper edge thereof, just below the nail line retaining the panel to the roof, to receive and retain the lower edge of the panels of the next higher course in a manner so as to eliminate the otherwise exposed nailheads. Decorative patterns simulating conventional materials such as shake may be impressed into the panels by vacuum forming and/or other manufacturing techniques. Use of a staggered panel side provides for a substantially hidden junction between sidewise adjacent panels to provide a continuous and unbroken pattern.

Abstract: This invention relates to the collection of solar energy by use of a novel concrete block construction and to the construction of buildings from such blocks for supplying the hot water requirements for a structure and/or the total heat for the building as well as the hot water supply.

Abstract: A composite module (14) is formed by a specially constructed mold (65) and division plate (80) to form plural splitting planes (28, 31, 33, 51, 54, 56) in the composite module which is thereafter split by a series of knives (114-116, 121-123, 126, 127) aligned with such predefined splitting planes to split the module into plural blocks (12, 13) each having plural irregular decorative surface areas (25, 26, 27; 48, 49, 50) having different widths (35, 37, 39; 58, 60, 62) and depths (30, 32, 34; 52, 55, 57). Such split-type decorative areas within a course (131) are aligned out of vertical alignment with decorative areas of other blocks in adjacent courses (130, 132) to form a decorative wall (134).

Abstract: A composite insulated wall includes a pair of outer poured concrete layers cured in a form and an organic or inorganic insulating panel or panels disposed between the concrete layers and retained in place by a number of lateral tie-rods extending through the insulating panel and into the concrete.

Abstract: A method, and an apparatus for carrying out that method, for making roofing from a stretchable and deformable sheet material. The roofing sections are made from sheet material which has a preformed laterally sinu-soidal configuration which is reconfigured with longitudinally spaced steps (or folds). The finished sheet is a roofing section having the configuration of stepped tile roofing which is a substitute for true roofing tile. The sinu-soidal sheet is clamped (or pressed) in a tool between two adjacent pairs of complimentary shape clamping jaws. In that tool apparatus the two pairs of clamps are then moved relative to each in parallel paths normal to longitudinal and lateral planes through the sheet, which movement stretches the sheet to form a step (or fold) between the portions held in the two sets of clamps.

Abstract: A prefabricated wall facing panel for buildings is described. A method of making such panels is also disclosed. The panels comprise a rigid polyurethane backing sheet and a plurality of facing elements embedded in said sheet. Tongue and groove formations at the respective upper and lower edges of the panel are provided for interlocking with adjacent panels. The panels are secured to a support surface by channel-shaped attachment members which can be nailed to the support surface and which engage in the grooves in the panels.

Abstract: A simulated-brick facing material, and a process for its manufacture; the facing material being applied to imitation fireplaces; the process including a wooden panel being furrowed on one side with parallel rows of grooves in two right angle directions so as to form a plurality of brick-shaped faces, the panel then being slitted fully through along the longitudinal grooves so as to form strips which are then glued in offset positions on an imitation fireplace and thereafter are painted so to simulate brick material.

Abstract: A continuous process and apparatus are disclosed for forming products from thermoplastic polymeric material having three-dimentional patterns and surface textures on one or both faces that may be similar or dissimilar with or without a continuously changing profile and with or without shaped edges, such as shake shingle panels, board and batten panels, rough barn board panels, wainscoting panels, brick panels, stone panels, patterned door panels, similar structural wall panels, roofing or siding panels, ribbed soffits, fascia board, flooring reinforced with egg crate ribs, forms for pouring contoured concrete structures, and other three-dimensional pattern and surface textured plastic products which may extend in widths up to 4 feet or more and in lengths up to 20 feet or more.

Abstract: A building structure having outer walls and corner elements that simulate a log-type building, the corner elements having a plurality of alternate wedge-shaped blocks that project at an angle with respect to each other, and a plurality of log facing elements spaced from each other by a mortar joint spacer element, the mortar joint spacer elements abutting centrally the wedge-shaped blocks that project normal to the plane of said mortar joint spacers.

Abstract: A plastic simulated brick wall free standing section adapted to be connected to other sections to form a brick wall.The plastic sections are of a open box-like structure having a simulated brick wall front. The sections are comprised of an even number of staggered tiers in which the tiers alternate in length to provide overlapping or overhanging bricks staggered between adjacent tiers one-half brick. In this fashion the sections may be inverted with respect to one another and interlocked and connected together by a pin passing through the overhanging end sections to lock the intertwined and interlocked sections together. A cap stone is provided at both the top and the bottom and extends forwardly from the front brick simulated wall a short distance so that when the sections are placed on the ground they provide a greater degree of stability while providing a pleasing appearance through the top cap stone.

Abstract: Disclosed is an exterior grade hardboard siding panel which gives the appearance of vertically-applied solid lumber planks having a bead and cove detail. The front surface of the panel has a plurality of adjacent areas which each simulate a vertical solid wood plank. Each of these areas has a cove recess at one edge and a bead adjacent to a cove at the opposite edge. The areas are arranged with the cove of one area and the cove adjacent to the bead of an adjacent area, both facing the bead. The coves are separated from the bead by narrow grooves which provide good breaking points in the design and added damage resistance at the edges of the panels which are joined with shiplap joints.

Abstract: A multi-lap siding formed from a hardboard material is disclosed. The multi-lap siding is rectangular and has generally flat, opposed front and rear surfaces, and an upper leading edge and the lower trailing edge being configured such that the upper leading edge of one siding can cooperate and interfit with the lower trailing edge of another siding to form a continuous siding installation. The lower edge of the front surface of the siding is provided with a lower bead portion. The upper edge of the lower bead portion is defined by a first, V-shaped groove having an angled upper edge, a rounded lower edge and a rounded apex portion. The lower edge of the lower bead portion is defined by the lower edge of the siding and is also rounded. The siding is further provided with at least one central bead portion disposed intermediate the front surface of the siding. The upper edge of the central bead portion is defined by a second V-shaped groove having a configuration similar to the first V-shaped groove.

Abstract: A decorative skirting panel system for mobile homes and the like is formed with adjacent panels having a vertically slidable side edge interlock wherein a particular panel may be easily removed for replacement, repair, or access without detachment of adjacent panels. The panel is preferably formed of expanded polystyrene foam and is provided with an exterior surface simulating masonry such as brick, stone, tile or other such construction material. The side edge interlock is of a V-shaped tongue-and-groove construction. This configuration provides a minimum surface area for a given width and depth of tongue and groove, thereby reducing friction and facilitating the removal or insertion of a panel by vertical sliding movement. The V-shaped tongue and groove is especially well suited to this application since it is not prone to binding in the case of dimensional inhomogeneities and the like.

Abstract: A roofing system having the appearance of Spanish or Mission tile made of fiberglass, with an interlocking overlapping means, which may be secured by conventional means such as nails or adhesives to new roofing structure or over existing roofing.

Abstract: The invention relates to a decorative stained glass insert unit which is attachable to an existing window unit to create an esthetically pleasing window treatment effect.

Abstract: Spacing means for wall panels for preventing the buckling of said panels due to changes in climatic temperature, the panels having slotted portions along a top edge and one side thereof for receiving a flange mounted along the bottom edge and the other side of an adjacent panel, the improvement consisting of breakable spacing members extending at approximately right angle to the panel and mounted in proximity of the slotted portions whereby upon mounting one panel upon another, the spacing members of the upper panel engages and rests on the top edge of the flange of the lower panel in predetermined spaced relation to the upper edge portion of the slotted portion, said space permitting the expansion due to temperature changes of the panels without buckling same.

Abstract: A triple lap siding product is machined from a strip of wide lap hardboard siding to give the appearance of three narrow laps of natural wood siding or actual drop siding cut from 3/4" lumber. The configuration for simulating narrow lap siding is machined with beveled profiles having opposed first and second surfaces. Each strip of siding includes a plurality of inclined cuts and vertical cuts subdividing the single strip into three lap portions. The configuration for simulating actual drop siding includes a plurality of arcuate cuts and vertical cuts that subdivide each strip of siding into three lap portions. For both types of siding, the leading edge of one strip is adapted to cooperate with the trailing edge of another strip to form a continuous lap siding installation on the building or the like.

Abstract: A masonry block unit having spaced, selectively removable, vertical flanges on its inner face which are so spaced that they may be laid in the same direction and overlapped corresponding to the spacing in order that alternate flanges will provide a continuous row for attaching cladding and between such rows standard insulation may be placed, with the removal of the flanges which do not fall in the continuous lines.

Abstract: A building wall erected from blocks presenting one or more surfaces formed with a matrix of grooves generally horizontally and vertically related, and an overlay veneer or applied surface coating adapted to be impressed or indented with appropriate tools in a manner to produce a wide variety of designs by selection of different combination of the grooves in the matrix. A method of variously decorating one or more building wall surfaces or sides of walls with the guidance of a matrix of grooves and an overlay coating adapted to be impressed or indented in cooperation with preselected grooves of the matrix.

Abstract: A simulated exterior surface assembly for creating the appearance of brick, stone, or the like. A sheet of plastic material, preferably vinyl, is provided with a series of simulated brick face sections or the like, defined by lines of weakening, where such sections are separable one from another by ordinary flexing. The sheet is provided with a peel-away self-adhesive allowing the simulated sections to be readily adhered onto a suitable undersurface. An optional arrangement includes the use of a mortar colored vinyl self-adhering backing material which is first placed on the undersurface and thereafter the individual simulated sections are suitably disposed thereon.

Abstract: A panel door comprised of a rectangular wood frame defining a generally rectangular central opening which may be subdivided by one or two spaced apart transverse frame members to define two or three smaller central openings. A thin plywood panel is laminated to a front side of the door and routed out in the central open area or areas and a reinforced polyurethane sculptured panel is molded into each opening. A thin plywood panel is laminated to the back side of the door. Both the front and back plywood panels are prelaminated with a polyvinyl chloride film.

Abstract: An integrated shingle construction in which shingles are constructed perferably of foamed plastic primarily, the construction being in the form of panels in which the foamed plastic shingle is integrated with a board or wooden roofing member such as a standard sized sheeting member that attaches directly to the rafters. The integrated shingle and sheeting members are applied in courses to a pitched roof, for example, the first course being at the top or adjacent the ridge pole and then proceeding downwardly to the eves. Adjacent courses are in interlocking sealing interconnection. The integrated shingle and sheeting members are formed in extended panels with the shingle portion simulating a plurality of individual shingles. Sealing and interconnecting or joining means are provided to sealingly join panel courses at their ends.

Abstract: An interlocking building block construction comprising an overlapping masonry block having opposite sides, stepped opposite upper and lower longitudinal faces, and stepped opposite vertical end faces. A plurality of spaced tapered recesses with flat bottom surfaces are located on the upper longitudinal face, and a plurality of correspondingly shaped lugs are formed in the lower longitudinal face. There are two enlarged rectangular openings extending entirely through the block located in the central area of the upper and lower faces between the vertical end faces. A plurality of small apertures are formed in and adjacent to the lugs for receiving pins for interlocking adjacent blocks. Header blocks, pilaster blocks, partition blocks and filler blocks are provided for interlocking assembly with the interlocking building blocks to build walls of a building without the use of grout or cement.

Abstract: An integrally molded one-piece ornamental plastic shutter having marginal portions providing peripheral front surfaces and inner and outer top, bottom and side surfaces. A plurality of discrete slats extend between the inner side surfaces. The slats slope downwardly and are parallel to and spaced from one another. Their lower edge portions are extended rearwardly to simulate the appearance and the rigid feel of the slats of a conventional wooden shutter.

Abstract: The invention relates to a composite paving structure consisting of elements forming a pattern. The structure is made up of laying units each of which has a group of elements adjoining at their respective peripheries and held together by predetermined rupture zones. Supplementing stones are disposed at the boundaries of adjacent units. The stones have one or more elements and extend, in each case, into recesses in both of two adjacent units. Preferably, the stones are of one shape and the pattern is a herringbone pattern. The units may be offset relative to one another in the herringbone pattern.

Abstract: An angled cap member is provided to finish off hips and ridges for use with a simulated cedar shake panel for walls or roofs having at least two courses of simulated shakes in relief therein, the shakes being in overlapped and underlapped relation with a varied butt line, and recessed underlaps between side-by-side shakes.

Abstract: A skirting side panel for mobile homes and the like is formed of a sheet of fused polystyrene beads and a coating of water based paint on one surface thereof. The sheet is molded with a plurality of raised portions on one surface providing a masonry appearance, such as mortared slump stone. Opposite side edges of the sheet have spaced projecting portions which interlink with corresponding edges of adjacent sheets to form a continuous skirt. Moreover, the polystyrene beads define cavity interstices on the masonry surface simulating the surface cavitations normally found on masonry blocks.

Abstract: This invention relates to extrudable construction forms which in combination with each other produces prefabricated structures such as walls, floors, roofs for homes, commercial buildings and other structures.

Abstract: A simulated exterior surface assembly for creating the appearance of brick, stone, or the like. A sheet of plastic material, preferably vinyl, is provided with a series of simulated brick face sections or the like, defined by lines of weakening, where such sections are separable one from another by ordinary flexing. The sheet is provided with a peel-away self-adhesive allowing the simulated sections to be readily adhered onto a suitable undersurface. An optical arrangement includes the use of a mortar colored vinyl self-adhering backing material which is first placed on the undersurface and thereafter the individual simulated sections are suitably disposed thereon.

Abstract: Facing structures for buildings simulating brick, stone, shingle and the like consisting of rectangular shaped panels of identical construction that interlock, overlap and abut with each other, each panel having a flange extending along its top and a first side edge that terminates in a wedge shaped edge portion that is received by a mating slot portion formed along the bottom and other side edge. The top and first side flanges are provided with openings for receiving rails that are overlapped by the edges of the adjoining panels along the slotted portions; the portion of these flanges along the tops of the panels not overlapped by the adjoining panels form a continuous mortar line while the portion of the flanges along the sides of the panels not overlapped form interrupted mortar lines.