Abstract: A member (1) for securing insulation panels (7) to a structural component (8) is formed of an annular head (2) and an axially extending hollow shaft (3) extending from the head. The hollow shaft (3) is arranged to receive a nail (9) for fixing the member to the structural component (8). An axially extending section (4) is positioned within the hollow shaft (3) and has an abutment (5) at its end closer to the head (2). When the nail (9) is driven into the structural component (8) its head (2) contacts the abutment (5) and at least an axially extending part (4) of the section is collapsible to compensate for excess driving energy supplied to the nail whereby it is inserted for variable depths into the structural component (8). The collapsible part (4) of the section prevents compressive forces from exercising any damaging effect on the insulation panels (7).

Abstract: A device suitable for fastening a roofing membrane to a roofing surface comprises a pair of stress reliever plates, preferably coupled along one edge. Membrane engagement members, such as spikes, extend A device suitable for fastening a roofing membrane to a roofing surface comprises a pair of stress reliever plates, preferably coupled along one edge. Membrane engagement members, such as spikes, extend from the inner surface of one plate toward the other plate and are received in holes provided in the other plate. In the preferred embodiment, the two plates are coupled to one another by coupling or hinge systems, and a method for using the device is disclosed which comprises placing the fastener at the edge of the membrane material. Use of the dual plate stress reliever in combination with the membrane engaging the spikes provides a system with high resistance to lateral pullout and a system which is easy to install. Wrinkling of the membrane during fastener installation is also minimized.

Abstract: A shutter panel for use in a lost formwork for making a cavity floor. The panel has connection members for bearer feet. The connection members extend through holes in the shuttering panel. For marginal reinforcement of the panel around the holes, special fittings are provided, for example bracing plates, flanges or washers disposed against the underside of the panel. The holes in the shutter panel may also have an inside diameter such that the bearer feet can be passed through them from above at the time of fixing to fittings at the holes. The panel preferably consists of plaster.

Abstract: A new roofing system (14) for installation on a structure (2) whose existing roof deck (6) and membrane (12) may include depressed regions (8, 10) compensates for the depressed regions with contour cut compensation panels (18). Filler panels (20) are placed atop the roof deck, membrane and any required compensation panels, with opposed perimeter edges (64) of adjacent filler panels abutting. The filler panels are secured to the underlying roof deck with anchor plates (22) and screws (70), one anchor plate preferably securing four adjacent filler panels at the junction of their corners. The filler panels may have uniform thickness (58) or, if a sloped roofing system is to be fabricated, they may have non-uniform thickness (60, 62). Lengths (82, 88) of roofing material (76), such as galvanized metal, are laid atop the upper surface (72) of the filler panels and anchor plates and are secured to the anchor plates with screws (92).

Abstract: A method of inserting a rivet having at least a body portion and a mandrel having means for cutting and peeling back the rivet into portions which curl back on the rivet body into a solid substance. The rivet and mandrel are inserted into the solid substance without completely piercing through the solid substance. The rivet is then cut and peeled back into portions which curl back on the rivet body within the solid substance. The invention is also directed to a product comprising a solid substance, and a material fastened to the solid substance by at least one rivet which extends through the at least one material and into the substance without completely piercing through the substance. The at least one rivet has been cut back into portions which curl back on the rivet body, thereby attaching the material to the solid substance.

Abstract: A new concept wall system is provided, wherein a moisture and vapor barrier is positioned in an enterior insulation finish system to provide thermal stability regardless of climatic variations. Specifically, a two part membrane of multiple cross-laminated layers of polyethylene film fully bonded to a layer of rubberized asphalt is placed between the substrate and insulation layers of the exterior insulation finish system.

Abstract: An anchor is formed in a wall or ceiling composed of friable asbestos containing material by placing a plate member having a seal member around its peripheral edge against the wall or ceiling and then driving a fastener through the plate member and into the wall or ceiling. The plate member is of a size to permanently contain between the plate member and the ceiling any friable asbestos containing material which is dislodged by the fastener. Preferably, the seal, which comprises a sealing strip with an adhesive coating, or a sealing adhesive, temporarily secures the plate member to the wall while the fastener is being driven through the plate member to assure that the plate remains in place; however, it is the fastener which permanently secures the plate member to the wall or ceiling.

Abstract: An improved method of attaching a roofing membrane to an underlayment and an improved roofing construction made by the improved method. A screw and a composite roofing washer are used to attach the membrane to the underlayment. The composite roofing washer is an interlocked assemblage of a metal roofing washer and a thermoplastic insert. After the screw has been driven, the thermoplastic insert is heated so as to cause some of the material of the thermoplastic insert to flow over the head of the screw, thereby to heat-seal the screw to the thermoplastic insert. The thermoplastic insert may be so heated when the roofing membrane is welded to another like membrane at an overlapped seam.

Abstract: A wall construction is provided which includes a wall upon which are located siding sections to which are fastened brick sections. The siding sections are arranged in coplanar end-to-end relationship and include abutting ends with nesting tongue and groove arrangements to resist relative transverse movement between the sections. The tongue defines a passage extending transversely across the same. A clip is provided which includes a central portion located between the ends of the siding sections. The central portion extends through the aforementioned passage in the tongue. The clip includes further portions extending in opposite directions from the central portion along opposite sides of the siding sections. A protruding flange is provided which extends outwardly from the first further portion and a settable material is provided adjacent the siding sections. The protruding portion is embedded in the settable material.

Abstract: The invention concerns an assembly of roof battens which enables them to be stored in an assembled state and layed rapidly at the desired spacing on a receiving surface such as the rafters of a roof; a continuous flexible sheet is held in place by stapling strips onto the battens where they intersect with them, in such a way that, after the assembly of battens has been layed on the rafters, the continuous flexible sheet forms a deep central trough between two adjacent rafters to allow water to run off.

Abstract: An apparatus for securing adjustable roofing support spacers to underlying secondary structural supports, the adjustable roofing support spacers used to support a new sloped roof system over a preexisting roof deck. The apparatus comprises a bearing member which is positioned on top of the existing roof deck, and connectors which connect the bearing member and the support spacer to the structural support and extensive through the roof deck.

Abstract: A roof membrane anchoring system in accordance with the present invention includes an anchoring plate with a roof engaging surface and a top surface that can be attached to an existing structure. The anchoring plate has an axial opening therein into which a lip extends. An insert is inserted into the axial opening in the anchoring plate once a roofing membrane is inserted into the axial opening in the plate. The insert has a greatest diametrical dimension. The anchoring system is designed to assume a first state wherein the greatest diametrical dimension of the insert is slightly less than the inside diameter of the axial opening and slightly greater than the inside diameter of the lip extending into the axial opening and a second state wherein the greatest diametrical dimension of the insert is slightly less than the inside diameter of the lip which extends into the axial opening.

Abstract: A roofing system and method of securing insulation board to a roof deck free of mechanical fasteners includes the deck, a plurality of the insulation boards, and a flexible waterproof membrane which covers the boards. First and second embodiments of the invention include flexible polyisobutylene pads and strips respectively, which have opposite top and bottom pressure sensitive adhesive surfaces. A plurality of the pads are adhered to the insulation boards by their adhesive top surface at locations where mechanical fasteners otherwise would be necessary to secure the boards to the roof deck. A pair of the strips are adhered to the boards by their adhesive top surface at spaced locations. After removal of a release sheet from the bottom surface of the pads or strips, the boards are placed and pressed on the roof deck, and the exposed adhesive secures the boards to the deck free of mechanical fasteners.

Abstract: A free floating hard wood floor system has upper and lower subfloors sandwiched to provide a monolithic panel system which supports the floorboards above with optimum rigidity and integrity at a reduced cost. Flat nail clinching strips are located between the sandwiched upper and lower subfloors. The floorboards disposed above the upper subfloor are secured thereto by a plurality of clinching nails extending through the floorboards, the upper subfloor and into the upper subfloor after deflecting on the flat clinching strips.

Abstract: A method of installing a roofing fastener including a screw and a stress plate into a multilayered roofing structure involves bonding the outer surface of the screw to the inner surface of the plate. Such a bond may be formed by spin welding as the screw is installed in the roofing structure. The fastener is thereby installed and bonded in the same operation. A fastener assembly useful in the foregoing method includes a screw and plate having welding surfaces made of a thermoplastic resin.

Abstract: A roof system is provided for buildings having an unventilated roofing support such as concrete forming a planar receiving surface. An intermediate plate formed of an environmental-tight sheet of plastic material is placed on the planar receiving surface. The sheet contains a uniform pattern of protuberances such as frusto-conical studs having planar tops. A rigid roof covering formed of corrosion-resistant metal plates such as zinc is laid on top of the planar surfaces of the studs. The plates have interfitting, bent edges forming troughs. The studs space the rigid roof covering from the intermediate sheet forming a ventilation space for collecting leaks or condensation.

Abstract: A surface welded plastic roofing system overlying a roof-supporting deck which bears a layer of thermal insulation, the system including a plurality of thermoplastic fastener plates mounted on top of the thermal insulation and affixed to the deck by means of a suitable fastener that penetrates the thermal insulation, the system including a thermoplastic top membrane overlying all the fastener plates and covering the entire roof, the bottom portion of the top membrane overlying each fastener plate being fused to the fastener plate by means of a welding material.

Abstract: A tie anchor for sandwich panels of reinforced concrete is formed as a flat strap. The reinforced concrete sandwich panel is formed by placing a plurality of tie members vertically in the bottom of a horizontal form with reinforcing rods extending through holes in the ends of the ties adjacent to cross-feet. A network or grid of reinforcing steel is supported from a chair provided by the ties and cross-feet and the concrete for the first layer of the panel is poured about the ties, cross-feet and reinforcing steel grid. A layer of rigid insulation material is placed on top of the first layer of wet concrete about the projecting tie members immediately after pouring the first layer of concrete and a second grid of reinforcing steel rods is supported from the holes in the projecting upper ends of the tie members. The second layer of concrete may be immediately poured about the upper end of the tie members and reinforcing steel.

Abstract: A panelized roof system comprises a plurality of panels for positioning on a roof substrate. The panels comprise a foam insulation board with a rubber-modified bitumen-saturated synthetic fiber mat bonded to the top surface thereof. A plurality of fasteners penetrates the sides of the panels and secure the panels to the roof substrate. The panelized roof system is completed and rendered waterproof by a plurality of rubber-modified bitumen-saturated synthetic fiber strips which are applied with hot-mopped asphalt or other non-torched adhesive to the joints between the panels so as to overlap the adjacent fasteners securing the panels to the roof substrate.

Abstract: A fastener/plate assembly for fastening material to a roof deck employs a threaded fastener having a shank with two thread sections. The distal end portion of the shank has a thread which is loosely insertable through an opening of the plate. A second thread of the shank has a thread diameter greater than the first section and is threadably engageable with the plate. The driver end of the fastener is dimensioned so that during an overdrive condition, the fastener may threadably disengage from the plate to allow the driver end to pass through the stress plate opening.

Abstract: A foam plastic sheet attached to a primary wall, or substructure, is provided with a plurality of spaced, linear, parallel slots in its outer surface. Also securely attached to the primary wall adjacent to a lower edge of the plastic sheet are a plurality of spaced gussets for supporting an L-shaped ledge angle which is also mounted to the wall and extends the length of the plastic sheet. The ledge angle extends outwardly from the wall and includes a return flange on the distal end thereof. A grout adhesive layer is applied to the outer surface of the plastic board followed by insertion of an elongated support/spacer strip into each of the slots therein. Each strip is provided with a plurality of spaced, generally pointed tabs extending outward from the plastic sheet and through the layer of grout. A high strength fabric mesh is pressed into the grout such that the tabs extend through apertures in the mesh.

Abstract: A stress plate for clamping a membrane to a roof deck wherein the plate includes gripping prongs which grip the membrane, preferably without piercing of the membrane.

Abstract: A pin for fixing a panel to a support material is provided, having a shank (1) and a head (4), and a narrowed anchorage portion (5), a washer (2) for pressing the panel to be fixed against the support material and a guide (3) for limiting the penetration depth the shank (1). The pin, to be anchored within a material supporting the panel by means of a powder actuated tool does not damage the panel and ensures fixing of the pin with very good quality The guide (3) comprises a cylindrical tube which forms a hole within the panel, within which the cylindrical tube guide (3) is disposed so as to serve as a guide for the shank (1) of the pin as the same is being driven therethrough and into the support material.

Abstract: A locking plate which is adapted for fastening insulation to a roof deck employs a locking grommet which snaps into the roofing plate and seats the head of the fastener. The locking grommet locks the fastener to the plate and maintains a constant fixed relationship at all times between the fastener head and the locking plate thereby preventing the head from popping up above the plate.

Abstract: A fastener for insulated roofing comprises a non-metallic, screw-threaded shank, having a penetrating point at one end of the shank and a transverse plate carried at the other end of the shank. The shank and transverse plate are preferably integrally method out of a polyetherimide resin formulation which has a tensile strength of at least 15,000 psi. as tested by ASTM D638. Such a fastener has a great advantage in terms of cost and lack of corrodability, while still exhibiting the required strength. Also, a universal driver socket is provided.

Abstract: Each spacer comprises a foot portion of a polygonal cross section, which is rotatably lockable in a correspondingly profiled part of the plate. Each foot portion is topped by a star shaped surface and extended by a vertical rod or column terminated by a head portion which is hollow for passage of fastening means provided for maintaining the upper fixation element onto the head portion. The upper fixation elements are suitably stiffened by corrugation means and provided with a center hole for passage of the fastening means.

Abstract: A sealed roof deck wind vacuum transfer system is disclosed which provides the need for an air seal barrier in a roof assembly by sealing the underlying roof deck panel joints.

Abstract: An apparatus and method for securing an outer roofing membrane to a roof deck includes a flat bar anchor strip and a bar anchor tape having successive layers of an optional primer, an adhesive and a protective layer.

Abstract: A two-piece fastener system for installing roofing insulation. The fastener system includes a round disk having a hub extending outwardly from the center of one side. The outwardly extending end of the hub includes an opening adapted to accommodate a threaded fastener or nail. A thermally insulating plug is driven into the cavity through an opening at its opposite end to abut against a head of the fastener, preventing it from backing out. In one embodiment, the plug is retained by a lip that extends thereabove, and in a second embodiment, is retained by engagement of a ridge in a corresponding groove.

Abstract: A fastening assembly (1) for fastening a waterproof membrane and thick insulation to a roof deck comprises a screw threaded fastener (2) having a driving head (9), a clamp plate (5) for spreading the clamping load of the fastening assembly over an area of the surface of the waterproof membrane, a clamp tube (4) having a head (19& ) and a foot (18). The foot (18) is arranged to be engaged and held by the head (19) is arranged to engage and hold the clamp plate (5). An expanding auger (3) is formed between a screw thread (7) of the fastener (2) and the foot (18& ) of the clamp tube (4) In use, the auger (3) rotates with the fastener to expand the hole in the waterproof membrane through which the fastener (2) is inserted so that it accommodates the clamp tube (4) of the fastening assembly (1).

Abstract: An insulating and waterproofing structure for a generally horizontal roof includes an insulating layer of heat-resistant synthetic resin foam which is placed on the roof. The foam has at least a partially open-celled structure at an upper surface of the insulating layer. Molten tar is spread over the insulating layer to a thickness of only a few millimeters, and gravel is then spread over the tar layer. The tar is then heated sufficiently to penetrate and bond with the upper surface of the insulating layer and also to be drawn upwardly through the gravel layer by adhesive and capillary-type forces to form a bond with the gravel. The result is a subtantially unitary structure which insulates and waterproofs the roof while minimizing the tendency for the gravel to displace.

Abstract: A veener wall anchor system interconnects a backup wall of block construction to a brick veneer wall. The system includes a wire joint reinforcement, embeddable in backup wall mortar joints, preformed with a plurality of thin plates welded thereto. When the joint reinforcement is embedded in the backup wall mortar joint, the plates extend outwardly therefrom. A wall of rigid insulation is placed against an outer face of the backup wall with the plates extending through the insulation. The plate includes an elongated aperture outwardly of the insulation for receiving an spring clip fastener which resiliently engages the insulation wall and contact with the backup wall. A pintle tie includes leg portions received in the plate aperture and a U-shaped portion embeddable in mortar joints of the veneer wall to interconnect the veneer wall with the backup wall.

Abstract: A rotatably drivable roofing fastener of the invention of a synthetic-resinous-polymeric material, such as of an injection molded cut-glass-fiber filled nylon composition, includes means adapted for drillably cutting into insulation material during fastener installation and also means adapted to matingly engae a special tool providing rotatable driving while the tool also concurrently rotatably drives and matingly engages the head of a metal screw, which is located within an upper region of an aperture running lengthwise through the fastener's head and downwardly extending shank, so that the metal screw's threaded shank and tip extending from the aperature at the bottom of the fastener penetrates roof deck or existing roof structure upon rotatable driving so as to secure insulation material to roof deck or existing roof surface.

Abstract: The invention herein is a roofing fastener with integrated swivel means on the upper part to facilitate the process of affixing rectangularly shaped sheets of rubber roofing material to the upper surface of a roof. Specifically, the invention is a longitudinally disposed fastening member in the general form of a screw or nail-like member which is adapted to be inserted through the upper surface of the rubber roofing sheets and thence through the upper surface of the roof structure, serving thereby to anchor the rubber roofing sheets to the fixed roof structure.

Abstract: A single ply roof installation and method of making and using the same is disclosed. Flexible material securing units are provided for attaching to the underside of the membrane sheets. These securing units have a varying thickness across the surface area and are disposed in the field of the roof so as to attach to the membrane at the seam area of overlapping membrane sheets. Certain embodiments include securing units made of two pieces of the membrane material each piece having a different size, with the pieces welded together by heat or solvent welding. The securing units are distributed in the field of the roof in a regular pattern along seam sections adjoining sheets of the roofing membrane.

Abstract: A channel shaped strip formed of a resilient material that is press-fitted over the beams of a deck to protect the beams from water damage and the like. The strip also contains a series of raised resilient ribs equally spaced along its length. The inside distance between adjacent ribs is equal to the width of the planking mounted upon the beams. The strips are fitted upon the beams to that the ribs are co-aligned in rows that are perpendicular to the beams so that the planks can be laid down between the ribs in spaced apart parallel alignment.

Abstract: An anchor for releasably anchoring a membrane to a surface housing a base member for attachment to the surface, the base member including a post having a groove therearound, and a fastening assembly shaped to freely fit over the base member with the membrane thereover, the fastening assembly including a fastening ring, housed in ring fastening member, capable of inward deformation to cooperate with the groove with the membrane therebetween to captively hold the assembly on the base member and a deforming member to deform the fastening ring inwardly into that cooperation and to maintain that cooperation.

Abstract: A nonpenetrating roof membrane fastening system for covering and securing a waterproof flexible membrane on a roof deck. A plurality of flexible spot bonding pads are secured at spaced intervals to the roof by a smaller, more rigid, fastener plate or washer and a linear fastener which extends through the aligned centers of the pads and plates. An outer exposed peripheral area of each of the bonding pads has an adhesive applied thereto and bonds the pads to the underside surface of the flexible membrane which is laid over the secured pads avoiding any penetration of the membrane by the linear fastener. The membrane is a nonreinforced EPDM and the bonding pads are formed of a fabric reinforced EPDM.

Abstract: A joist protector which is placeable between a joist and a plurality of planks prevents water from entering the joist through nail holes or cracks. The joist protector has a generally planar central web and downwardly angled side flanges. A plurality of spaced water deflectors and interspersed deck planking spacers may be formed on the central web.

Abstract: A non-penetrating fastener for mounting elastomeric sheeting to a roof includes a base plate adapted to be fixedly mounted to the roof and having a surface which mounts an induction heating element coated with hot melt adhesive, and a rigid top plate having a surface which mounts a second induction heating element coated with hot melt adhesive. The rigid top plate and base plate are positioned on opposite sides of an elastomeric sheet so that their adhesive coated surfaces of their induction heating elements contact the sheet and the rigid top plate overlies the base plate. In response to bombardment with a magnetic flux from an induction welding device, the induction heating elements of both the base plate and rigid top plate heat the adhesive thereon to the molten state for adhesion to the elastomeric sheet.

Abstract: A building wall covering system for application to a wall support comprises a layer of insulative material and an overlying layer of matting which is attached to the wall support structure. The matting is particularly adapted to provide structural strength in the cementitious material applied thereto. The matting is of a bulkly layer of open construction formed by randomly directed interconnected flexible filaments. The cement layer is applied to fill the voids in the matting and cover same. A finish coat is applied to the layer of hardened cement material to complete the covering. The system has considerably enhanced impact resistance compared to existing systems.

Abstract: An insulation hanger for supporting a compressible insulation blanket upon a supporting wall which is formed of three pieces, the first of which is an end weldable stud welded to the supporting surface and upon which the blanket to be secured is impaled. The end weldable stud includes a plurality of annular grooves of reduced cross section providing a shoulder at the juncture between the groove and the body of the stud. A flat washer like blanket retainer is utilized which has a keyhole aperture which permits the retainer to pass over the stud through a larger hole to compress the blanket and thereafter to be moved translationally to an aperture of size approximating the groove to interlock the blanket retainer with the shoulder of the stud.

Abstract: A fastener assembly for securing layers of roofing material to a deck includes a nut for insertion in and engagement with a pre-drilled hole in the deck and a threaded bolt for engagement with the nut. The nut is provided with resilient legs that are disposed both above and below the hole and that deflect outwardly upon being engaged by the bolt to prevent removal of the nut from the hole. The shank of the bolt is provided with a groove that engages edge portions on the nut legs to prevent counter rotation of the bolt.

Abstract: A fastener for securing a flexible waterproof sheet to a supporting roof structure. The fastener includes an elongated mounting bracket having a base and a body including an upstanding central portion and a pair of wing members extending laterally from opposite sides of the central portion of the body. Each of the wing members include an outer tip spaced above the base which defines a sheet-receiving recess therebetween. The fastener also includes an elongated cap member for attaching a flexible waterproof sheet to the bracket.

Abstract: A free floating hard wood floor system has upper and lower subfloors sandwiched to provide a monolithic panel system which supports the floorboards with optimum rigidity and integrity at a reduced cost. The upper subfloor has grooves milled in the bottom surface with flat clinching strips received within the grooves. The floorboards are disposed above the upper subfloor and secured thereto by a plurality of clinching nails extending through the florboards, the upper subfloor and into the upper subfloor after deflecting on said clinching strips.

Abstract: A plastic shear connector for forming an insulated wall having an improved fiber composite or plastic shear connector which is used to form a composite wall formed of an insulating sheet and one or more concrete layers wherein the shear connectors are formed with tapered ends and have a holding portion injection molded and mounted on the center portion of the shear connector and which is inserted through the insulating board as the composite wall is formed.

Abstract: An anchoring system and method for fastening a plurality of veneer units (12) to a substrate wall (11) with a waterproof membrane (13) therebetween. The anchoring system (10) comprises a membrane-holding means (14) which is attached to the substrate wall (11) and holds the membrane proximate the wall (11) without puncturing the membrane (13). The anchoring system (10) also includes a support and tie structure (20) including a stationary anchor (19) and a vertically slidable, horizontal tie (24) which is positioned between adjacent units of veneer (12) for stabilization of the veneer wall. The invention further includes means for interconnecting the support and tie structure to the membrane-holding means. In one embodiment of the invention, this interconnecting means comprises a base channel (33) having upper and lower, outwardly extending horizontal legs. The base channel (33) has a central aperture (36) which accommodates the membrane-holding means (14).

Abstract: A roofing system including insulation blocks and a flexible membrane. A plurality of insulation blocks are positioned atop a roof frame with the longitudinal edges of the blocks being spaced apart. A plurality of plates are mounted atop the insulation blocks with the plate being positioned adjacent the four corners of adjacent but spaced apart insulation blocks. Downwardly depending ribs from the plate space the insulation blocks apart while preventing rotation of the plate. Additional ribs extend form the plates against and into the insulation blocks further limiting movement of the plates. A fastener secures each plate to the roof frame. A membrane extends over the entire roof and is attached thereto by adhesive means located atop the plates.

Abstract: A wire anchor comprises a member having a U-shaped portion, the legs of which span the air space between the veneer wall and a stud, a transverse offset portion on each leg that engages the external face of the stud, and a pair of attachment portions that resiliently snap into a retained position on the stud. One of the attachment portions includes an inturned part defining a slot that is captured by the free edge of the inturned leg part of the stud. Both attachment portions include arms that engage the web portion and inturned leg part, respectively, of the stud.

Abstract: A roof structure and its components comprises a series of metal panels having flanges that interlock when the panels are laid side by side and which are subsequently tightly seamed together to convert the individual panels into an integrated roof forming membrane. The roof structure may be insulated through the use of a blanket vapor barrier and insulation under the panels preferably along with thermal blocks located over the purlins. The roof structure includes unique flexible panel mounting clips that attach the panels to the purlins in such a way as to permit the panels to expand or contract in response to temperature and pressure changes, thereby minimizing roof stressing.The questions raised in reexamination request No. 90/000,342, filed 03/16/83, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U.S.C. 307 as provided in 37 CFR 1.570(e).