Abstract: A trim piece for installing at a drywall external right angle corner which is provided with a bullnose corner bead includes an intermediate portion which wraps over the convexly curved portion of the bullnose corner bead and has two edges extending parallel to the edges of the flanges of the corner bead. Two leaves are attached to the intermediate portion of the trim piece at the two edges respectively. The intermediate portion of the trim piece has an interior surface at a first end matching closely the exterior surface of the corner bead and an exterior surface which is convexly curved at the first end and is right-angled at the opposite second end and provides a transition from the convex curve to the right angle between the first and second ends.

Abstract: A boxable corner bead for finishing drywall corners that is made from two flanges with a protruding nose section. This bead can be made in regular, bullnose, or flex trim type arrangements. Once the bead is attached to a drywall corner, it can be mudded on both sides of the corner without waiting for the mud on the first side to dry. This is because of the shape of the nose which allows a mud dispensing box to apply mud on one side without getting mud on the nose. The box can then be immediately moved to the other side, where that side can be mudded. The nose itself is prepared to directly receive paint or texture, and hence does not need any mud. The flex-trim version has a raised trapezoidal section with a V-groove cut in the back. The bead hinges around the V-groove to match any corner angle. Both sides can be mudded as with the fixed bead. The beads can be used with both interior and exterior corners.

Abstract: In a drywall-trimming accessory molded from a polymeric material, such as polystyrene, and having two flanges, which diverge from each other, each flange is adapted in an intended use to cover an edge portion of a drywall panel and to have a fastener driven through said flange. Each flange has a mosaic of break-away panes. Each pane being adapted to break away from the flange having such pane, along at least one of the grooves defining such pane, if such pane is struck by a fastener being driven through the flange having such pane. Preferably, each pane is defined by two elongate, parallel apertures and by two elongate, parallel grooves, which are formed in an inner surface of the flange having such pane.

Abstract: A drywall finishing system where a continuously extruded, elongated semi-rigid member with an inner and outer layer of fibrous material has a groove running end-to-end allowing the piece to assume any angle to match a drywall seam. The groove is held at a fixed angle near 89 degrees (or any other fixed angle) by a break-apart bead running in the groove. The break-apart bead can be glue or extruded plastic or other means that holds the flanges at a rigid angle. If the seam is a right angle, the piece is used without breaking the bead. If the seam is any other angle, the break-apart bead is snapped or cut apart allowing the flanges to assume any angle.

Abstract: Sized and shaped attachments made of suitable materials and having a predetermined thickness for straightening and replacing studs, joists and rafters, squaring of openings and for aligning a plurality of the studs, joists and rafters in the framing for a building to provide a planar application surface to which exterior finishing members can be affixed. The attachments have sized and spaced openings thereon operatively associated by frictional engagement with fastening members each having a slidable member thereon to enable the attachments or devices to be adjustably fastened to a given stud, joist or rafter so a plurality of such adjusted attachments or any replacement attachments can be aligned with each other to provide the planar application surface. Methods are provided to align a multiplicity of adjoining studs, joists or rafters, to square and to square and align openings with such attachments to provide the planar application surfaces.

Abstract: A corner apparatus for forming inner or outer corner areas of wall structures. The apparatus comprises an elongated corner section having two planar panel portions attached by a living hinge. The two panel portions and living hinge are extruded from a high strength plastic. The living hinge enables the panel portions to be placed at a desired angle relative to each other to form an inner corner of a wall. When forming an outer corner, an elongated, generally L-shaped metal corner member is inserted into grooves formed in distal end portions of each of the planar panel portions of the corner section. This holds the planar panel portions in a desired angular orientation and provides a very straight corner edge for forming the outer corner area. The apparatus significantly reduces the time to form and finish corner areas of walls which are finished with drywall, thereby significantly reducing the cost of construction of the structure.

Abstract: Drywall endcaps of the type that mate with drywall seam finishing material. The endcaps can be square or bullnose and cap the ends of exterior corners with either three 90 degree or other exterior angles, or two 90 degree or other exterior angles and one 90 degree or other interior angle. The endcaps can be made of two or three laminate layers with an inner layer that faces wallboard and a rigid or semi-rigid layer that can be optionally tapered. The semi-rigid layer can be high impact plastic. An optional outer layer is of fibrous material and is prepared to directly receive paint or texture.

Abstract: A corner bead is of the tape-on type, having an elongated metal core strip with a longitudinal arcuate nose and a pair of flanges extending outwardly from the nose at approximately a right angle. A cover strip of paper is bonded to the exterior surface of the core strip, and includes wings which project outwardly beyond the extent of the flanges. The cover strip is formed of a stock paper having high abrasion resistance, tensile strength, and which is dimensionally stable on contact with wet joint compound. The surface of the cover strip is abraded to partially loosen the surface fibers, which will increase the bond strength of the comer bead when installed on wallboard. The method of manufacturing a tape-on corner bead includes the steps of conditioning a strip of stock paper by abrading the surfaces of the paper, and then bonding the paper strip to an outward face of an elongated core.

Abstract: A corner trim strip for drywall construction has a pair of parallel spaced core strips and a center bead bonded to a paper cover strip so that the trim strip has a center rib and is adjustable at the rib between obtuse and acute dihedral angles.

Abstract: A quick-assembly corner protector including an extruded aluminum retainer adapted to be attached to the corner to be protected; decorative wooden panels laterally, slidingly engaged in the retainer adjacent the corner; and a co-extruded vinyl locking member adapted to hold the panels in place and provide a cushion at the corner.

Abstract: A corner bead comprising an arcuately profiled elongated central portion having two lateral edges and defining a concave and a convex surface, flanges extending from each of the lateral edges and unitarily formed therewith. The concave surface includes a pair of longitudinal rails extending at about 90° one from the other at the geometrical centerline of the concave surface and serve to align the corner bead of the present invention with the underlying drywall when applied over a drywall corner in the conventional fashion.

Abstract: A drywall reveal and retaining clip for assuring proper alignment of abutting drywall reveal sections. The retaining clip comprises a generally U-shaped channel that engages the rear of two abutting ends of similarly shaped drywall reveal and by engagement of longitudinal ribs on the retaining clip with mating longitudinal channels on the drywall reveal provides a joint that aligns the abutting drywall reveal ends and inhibits any relative movement therebetween.

Abstract: A drywall finishing system for finishing 1) normal inside and outside corners of any angle, 2) stub wall or closet corners, 3) window wrap corners, and 4) L-metal for window sills and areas where drywall ends against some other surface like brick. The finishing system comprises a preformed trim piece comprising a semi-rigid member that is relatively thick in the center and tapers laterally to a thin edge. A layer of paper is bonded to the inside surface of the semi-rigid member for receiving joint compound to continuously bond the trim piece to the dry wall. A layer of finishing material is bonded to the exterior surface of the semi-rigid member. To install one of the pieces, it is selected from stock and cut to length. A flat coat of mud is applied to both sides of an exterior or interior angle, and the trim piece is placed over the mud and smoothed into place. Since it is preformed, the piece makes a straight line at the required angle.

Abstract: A drywall-trimming assembly comprises a drywall edge-trimming strip extruded from polyvinyl chloride and a drywall corner-trimming device molded from acrylonitrile-butadiene-styrene. The drywall corner-trimming device has a projecting tab, which fits under an end portion of the drywall edge-trimming strip so that an outer surface of the projecting tab faces an inner surface of the end portion of the drywall edge-trimming strip. The projecting tab has a pattern of alternating ridges and grooves, which extend between the lateral edges of the projecting tab. An adhesive of a type that adheres comparatively less strongly to a unit of surface area of the outer surface of the projecting tab and that adheres comparatively more strongly to a unit of surface area of the inner surface of the end portion of the drywall edge-trimming strip is used for adhering the outer surface of the projecting tab to the inner surface of the end portion of the drywall edge-trimming strip.

Abstract: A connector and method for connecting two drywall corner finishing devices. The connector connects and/or aligns the two drywall corner finishing devices positioned end to end by being inserted into corresponding openings located in the profile of the drywall corner finishing devices. The side members of the connector are pinched in, reducing the size and shape of the cross-section of the connector so as to fit within the corresponding openings. When released the side members deflect back pressing out against the sidewall of the openings.

Abstract: For trimming an archway, a drywall-trimming has a nose with an outer surface and an inner surface. The outer surface has a curved portion conforming substantially to an arcuate profile with a radius in a range from approximately 1/4 inch to approximately 3/4 inch. The drywall-trimming strip has a series of slits defining a series of tabs spaced from one another along a tabbed edge but not extending into the nose. Near the tabbed edge, the slits have widened, oblong portions. Usually, the drywall-trimming strip has a flange extending from and along an opposite edge, but the flange is omitted for some applications. A comparatively softer portion, which includes the juncture where the tabs are joined to the tabbed edge, is made from a comparatively softer, more flexible, polymeric material, such as polyvinyl chloride having a hardness of Durometer 92 Shore A.

Abstract: An edge strip for being mounted along a base structure includes a first axially extending flange, a second axially extending flange obliquely extending from the first flange. The second flange includes a first support and a second support. The first support is configured for being mounted adjacent to the base structure and includes a first head portion, a first neck portion between the first head portion and the first flange, a second neck portion spaced from the first neck portion between the head portion and the first flange, and a first strut between the first and second neck portions. The first strut has a width greater than the widths of the first and second neck portions. The second support is adjacent the first support and is configured for being mounted adjacent to the base structure.

Abstract: A drywall tape with an attached bead allows application of mud to adjacent drywall panels not oriented right angles. The bead is carried in a lengthwise orientation by the middle of the drywall tape on the side facing away from the drywall. The bead provides left and right rails that are typically 1/16 or 2/16 of an inch in height. The drywall tape is positioned in the corner between first and second drywall panels. The blade of the application tool is supported at one corner by a lip carried by one of the rails, and at the other corner by the surface of the first drywall panel. A guide tool is inserted into a groove between the rails of the bead at the upper end of the drywall tape, and is moved downwardly in tandem with an application tool. The application tool smooths mud about one side of the drywall tape carried on the first drywall panel. The guide tool carried by the groove prevents the application tool, or any mud pushed by the application tool, from contacting the second drywall panel.

Abstract: This foundation material 1 comprises a substrate 2 having a sheet form, and a surface modifying layer on at least front surface of said substrate comprising 2.about.30 parts by weight of a film formation aiding agent for every 100 parts by weight of a resin having a hydrophilic functional group. In addition, this foundation material 1 is manufactured by forming substrate 2 by extrusion molding a synthetic resin, laminating at least a front surface of substrate 2 with a surface modifying agent comprising 2.about.30 parts by weight of a film formation aiding agent for every 100 parts by weight of a resin having a hydrophilic functional group, and drying the thus formed laminated substrate.

Abstract: For trimming a drywall corner, a drywall-trimming article has an elongate portion and two flange portions, which are extruded unitarily with the elongate portion from polyvinyl chloride. The elongate portion has an arcuate profile. Each flange portion has an array of apertures. One of the convex and concave surfaces defined by the central portion is covered substantially with discrete fibers, which adhere to the substantially covered surface but which do not cover the remaining surfaces of the central portion and of the flange portions. Such adhering fibers facilitate application of a coat of paint and texturization of the coat of paint over the substantially covered surface without separating the inner surfaces of the flange portions from the underlying drywall by any appreciable thicknesses due to such adhering fibers.

Abstract: A shielding brassiere fabricated of a soft supple material such as cotton interwoven with stainless steel threads to shield and screen the breast from electromagnetic radiation.

Abstract: The present invention is a reinforced wall patch comprising a sheet of mesh material, such as fiberglass mesh, and a sheet of fibrous material, such as paper, attached to the sheet of mesh material whereby the bendability of the mesh material is enhanced. Thus, the present wall patch may be effectively used as a cornerpiece in applications which require enhanced flexibility. A sheet of protective material may be attached to the surface of the mesh material in such a manner so that the mesh material is arranged between the fibrous material and the protective material.

Abstract: Broadly, the present invention is directed to an edge protector method and system for protecting an outside corner of a room which corner is formed by two walls. The inventive method for protecting such corner includes supplying a tape wound in roll form which tape is formed from polymeric material (e.g., polycarbonate) in a thickness of about 5 to 15 mils and which is scored. The tape has a front surface and a rear surface which is coated with a pressure sensitive adhesive. Preferably, a release liner is secured to the adhesively-coated side of the tape. Also, preferably, the tape and release liner both are axially scored. The tape is unrolled from the roll with the score in axial alignment with the room corner. Finally, the coated rear surface is pressed on each wall extending from the corner to form a corner edge protector for the corner.

Abstract: An edge strip for being mounted along a base structure includes a first axially extending flange and a second axially extending flange obliquely extending from the first flange. The second flange includes a first support configured for being mounted adjacent to the base structure. The first support includes a head portion, a first neck portion between the head portion and the first flange, and a second neck portion spaced from the first neck portion between the head portion and the first flange.

Abstract: In a drywall corner-trimming assembly, a splice is employed with two corner-trimming members, which approximate each other at one end of each member. Each member has a central portion and two flanged portions. With the splice straddling the members, a portion of one expansive surface of the splice faces the interior surface of the central portion of each member, which portion is located where the splice has at least one of the perforations. An adhesive layer is interposed between the same one of the expansive surfaces of the splice and the interior surfaces of the central portions of the members and is ventilated by the perforations.

Abstract: A drywall corner bead which includes a plurality of integral preformed barbs provided at intervals along the length of the corner bead for securing the corner bead to a drywall corner. The corner bead includes first and second longitudinally-extending flanges which are interconnected by a longitudinally-extending rounded nose, and the first and second flange are disposed at an angle of less than 90.degree. with respect to each other. The barbs project inwardly from the flanges in a generally perpendicular direction and have a length of less than about 3/32 of an inch. When the corner bead is applied to a drywall corner, the barbs penetrate substantially only the paper layer of the underlying drywall and secure the corner bead to the corner. The drywall corner bead can be rapidly applied to a corner without requiring additional tools or materials, and the corner bead is securely affixed to the corner by the barbs until the corner is finished with joint compound and paint.

Abstract: An intersection assembly for use with an architectural stucco reveal system. The stucco reveal system generally includes elongated strips of material which can be attached to an underlying structure. The strips include a base portion and generally two spaced-apart walls extending from a front side of said base portion defining a channel therebetween. Flanges extend away from outside surfaces of the walls and the channel. The intersection assembly includes at least two intersecting portions which have edges which are placed in abutment to define a desired angular configuration of the intersection assembly. A support plate of a generally rigid material compatible for welding to the intersecting portions is welded to a rear side of the intersecting portions. The support plate provides structural support to retain the intersecting portions in the desired angular configuration with the edges thereof in abutment.

Abstract: For trimming a drywall corner, a drywall-trimming article has an elongate portion and two flange portions, which are extruded unitarily with the elongate portion from polyvinyl chloride. The elongate portion has an arcuate profile. Each flange portion has an array of apertures. One of the convex and concave surfaces defined by the central portion is covered substantially with discrete fibers, which adhere to the substantially covered surface but which do not cover the remaining surfaces of the central portion and of the flange portions. Such adhering fibers facilitate application of a coat of paint and texturization of the coat of paint over the substantially covered surface without separating the inner surfaces of the flange portions from the underlying drywall by any appreciable thicknesses due to such adhering fibers.

Abstract: In a drywall corner-trimming assembly providing a "bullnose" configuration, two corner-trimming members and a splice are combined. Each member has a central portion and two flanged portions. The central portion has a generally arcuate profile. Each of the flanged portions extends from one of the lateral edges of the central portion at a step defining a lateral limit of a concave surface of the central portion. The members and the splice are assembled so that the splice straddles such members, so that a portion of one of the expansive surfaces of the splice faces the concave surface of the central portion of each of such members, so that the splice is concealed at least substantially by the central portions of such members are viewed, and so that each of the lateral edges of the elongate splice is pressed firmly against the step at one of the lateral edges of the central portion of each of said members. The splice is secured adhesively to the members, as by adhesive ribbons.

Abstract: An arch casing bead having a mounting flange and a ground flange extending therefrom. The mounting flange includes a free edge and an edge proximate to a junction of the ground flange and the mounting flange. A notch is formed in the mounting flange extending from the free edge towards the ground flange. The notch defines an arcuate portion which is positioned proximate to the ground flange. A pair of spaced apart edges extend from the arcuate portion to the free edge defining a mouth of the notch. The notch facilitates arcuate deformation of the elongated casing bead without angularly deforming the ground flange.

Abstract: A system of prefabricated plaster relief forms are manufactured to be applied to prepared walls of a building, such as a home or other structure. The prefabricated forms are made of an open work lattice material formed into a channel shape having a top, two depending sides and outward directed flange portions. The lattice material is configured to receive and hold a cementitious material such as plaster. The top and the sides of the prefabricated forms are configured to present a protuberant contour projecting away from the flange sections and thereby outwardly from the prepared wall. The cross section and the ends of the prefabricated forms are shaped to align end-to-end with identically shaped forms. Alignment of a plurality of such forms in a longitudinal direction provides a continuous relief band along the wall of a structure. The prefabricated relief form flange sections are configured for attaching to the prepared walls by means of nails, screws or adhesive.

Abstract: The invention relates to a wire bead (1) for plaster, stucco and the like comprising a strip of bent diagonal wires (2) and longitudinal wires (3) welded to one another, in which the strip is bent at an angle around a longitudinal wire (4) to form a wire bead (1) having a virtually V-shaped cross-section, in which the longitudinal wire running along the apex of the wire bead (1) is provided with a longitudinal profile (7) having a virtually triangular-shaped cross-section.

Abstract: A single sheet of metal such as galvanized steel is formed to provide an improved corner cap for the juncture of three walls. The improved cap has three legs having three arcuate regions extending from an apex into orthogonal or transverse planes. Each arcuate region has two lateral flanges. The prongs are formed by cutting and bending a piece of the flange so that the prong and the flange form a right angle. The corner piece is constructed to cover an outside corner for use on the outer portion of three adjoining walls. The apex region at the center of the three legs defines a raised portion against which corner beads will fit to provide an easy alignment mechanism for the corner beads, as well as a smooth surface.

Abstract: A building material manufacture (20, 21, 22, 64, 70, 81) forming an openway (23, 24) in a building (26) and to which wet cement or stucco trim or the like (40) is applied. One embodiment (20) includes base (28) and side (29) segments having staggered slots (31) and beads (30b) coextensive in length thereto for determining the depth of plaster or stucco to be applied, and with mounting flanges (35,36). Another embodiment includes a tiered arrangement (45) of base/side segments and mounting flanges. Another embodiment is fabricated out of a skeletal configuration (51) of a reticulated foraminous sheet of metal connected to a pair of spaced flanged members (48). Another embodiment (64) is formed of wires, longitudinally and transversely oriented to each other, and including flange-like elements for connecting it to a building formation for an openway therein.

Abstract: An approved corner bead for drywall construction having a paper layer bonded to an exterior surface of a formed metal or plastic core. The paper is impregnated with a latex prior to affixing it to the core. The uniformly impregnated paper provides improved protection against adverse abrasion at all levels of thickness of the paper. An improved method for covering joints formed between abutting sheets of drywall involves spreading a bonding layer of joint compound, embedding the paper strip in that compound, applying an exterior layer of compound, and sanding the exterior layer so as to provide a smooth and continuous surface between the drywall sheets.

Abstract: A decorative molding system removably installed at a juncture of a ceiling and a vertical wall, said molding system comprising a plurality of thin molding strips of flexible plastic having a length and an upper free edge, a lower free edge, a front surface and a back surface. The upper free edge is adapted to lie against one of the ceiling and the vertical wall along a line spaced from the juncture of the ceiling and vertical wall and flex relative thereto. The lower free edge is adapted to lie against the other of the ceiling and the vertical wall along a line spaced from the juncture of the ceiling and vertical wall and flex relative thereto. A corner in the room is formed by a first flexible molding strip mounted along a first wall and extends toward the corner of an intersection with an adjacent second wall. An adjacent second flexible molding strip is mounted on the adjacent second wall.

Abstract: An extruded strip joining system including a strip and a clip which cooperate to join free ends of extruded strips in precise abutment to maintain alignment of the strips. The strip joining system includes the strip which has an elongated junction portion and at least one elongated flange extending parallel to and away from the junction portion. The junction portion includes an internal surface and an external surface. Protruding structures are provided on the internal surface of the junction portion. A pair of axially elongated tabs are formed on the protruding structures depending from internal surface of the junction portion. The tabs are axially elongated along the strip and extend inwardly defining a channel therebetween. The clip is configured to engage the tabs thereby retaining the clip in the channel. Two strips are positioned with free ends abutting each other and a clip is positioned over the channel and pressed into engagement with the tabs.

Abstract: A corner trim member for use in drywall or other sheet wall construction. The cover trim has at least two wall members joining each other along a common edge, so that each wall member can overlay a corresponding corner portion of mutually-orthogonal drywall panels. Each side member of the trim has a relatively thick portion extending from a corner common to the wall members, and a second portion of reduced thickness relative to the first portion. The difference in thicknesses of the two wall portions is substantially equal to the thickness of a conventional cornerbead member with which the trim is used. Those cornerbead members overlay the relatively thin portion of the trim, so that the cornerbead is substantially flush with the relatively thick portions of the cap. The present trim thus provides structural underpinning for drywall finishing mud applied to a wall corner covered by the trim.

Abstract: An interior corner joint for joining wall board panels, particularly wall board panels simulating tiles embedded in grout, in a corner. The interior corner joint comprises a first base section; a second base section extending upwardly from said first base section and being perpendicular to said first base section; a rib extending upwardly from said first base section disposed adjacent to said second base section and canted toward said second base section, said rib, second base section, and first base section defining a channel adapted to receive a first wall board panel; and a flange at the distal end of said rib extending outwardly from said rib and inclined toward said first base section, said rib, flange and first base section defining a second channel adapted to receive a second wall board panel in substantially perpendicular relationship to said first wall board panel. With the two wall board panels inserted into the two channels the only exposed part of the joint is the flange.

Abstract: A prefabricated corner bead for placement along a wall corner edge is disclosed. The corner bead includes an elongate metal rib bent which is along its longitudinal axis to define a pair of laterally extending flanges. The corner bead further includes a pair of mesh strips, with each mesh strip overlapping and secured to each flange. The mesh strips carry a pressure sensitive adhesive, which may be activated by the application of pressure thereto, to adhere the mesh to the wall and thereby securing the corner bead about the corner edge. Once the corner bead is secured about the corner edge a covering layer of joint compound may be applied thereto to conceal the corner bead and provide a finished wall corner.

Abstract: A combination slutter and nosing strip for covering the outwardly facing unfinished edges of tiles and a stair tread on which the tiles are mounted. The combination slutter and nosing strip includes, a horizontal anchoring flange secured between the stair tread and the tiles. The combination slutter and nosing strip further includes an upwardly extending slutter bar segment for covering the outwardly facing unfinished edge of the tiles and a downwardly projecting nosing segment for covering the exposed unfinished edge of the stair tread.

Abstract: A foldable translucent corner protector comprised of a flat strip of synthetic plastic, the corner protector having a V-shaped groove extending its length, the groove having a depth of 1/64" or less the V-shaped groove dividing the strip and enabling the strip to be bent from a flat form along its length to provide a pair of bendable strip leaves for attachment to an angled wall surface of varying sized angles about a wall corner for protecting the wall corner.

Abstract: A protective guard to be used in conjunction with a structural corner or corner edge having metal beading or metal backing is provided and consists of an injection molded, elongated resilient one-piece body divided longitudinally into two equal halves connected by integrated living hinges. The protective guard is secured in place by a plurality of integrated oriented multiple pole ceramic magnets. The protective guard includes a continuous edge border which abuts the surface of the structural corner or corner edge such that the plurality of magnets are in close proximity but not contact with the structural corner or corner edge.

Abstract: A drywall corner-finishing accessory comprises three integrally joined, elongate strips, namely two relatively rigid, lateral strips and a relatively pliable, middle strip coextruded respectively from polyvinyl chloride having different durometer hardnesses. Each lateral strip has a rib along one edge. At its opposite edges, the middle strip is joined to the lateral strips at the distal edges of the ribs, preferably being joined to lateral surfaces of the ribs, so that a broad surface of the middle strip is stepped from the lateral strips. The accessory is flexible along the middle strip selectively to define a stepped, inside corner and to define a stepped, outside corner. The rib of each lateral strip guides a drywall-finishing tool and has a grooved pocket opening toward the distal edge of such lateral strip to receive drywall-finishing material.

Abstract: A wall panel system for constructing clean rooms includes wall panels, wall studs and a "z" bracket assembly device for mounting the wall panels to the wall studs. The wall panels are covered with a protective covering of a hard core plastic laminate or a shatter-proof polyvinyl chloride (PVC) which provides a sanitizing surface. Also, the system includes wall panel seam filling, internal corner covering and external corner covering to preserve the integrity of the clean room. At least one door is provided for access to the clean room and one window may be provided for viewing access to the room. The room is constructed to provide a particulate-free environment.

Abstract: A corneraide device is provided for finishing joints at the intersection of two or more surfaces. The corneraide includes a substantially planar central web with bead members along the edges thereof. Operatively associated with the bead members and extending therefrom are flange members adapted for alignment with the two or more surfaces. Joint compound, wallboard mud, stucco or some similar formable finishing or coating material is applied over the flange members and fayed from the bead members over the respective flange members to the respective surfaces. The corneraide of the invention permits ready alignment on the intersection and efficient application of finishing material thereon. Various embodiments and adaptations of the invention may be utilized to finish arches, window corners, exposed three-way corners, and other structures.

Abstract: A tile edging trim strip comprises a body having an anchorage portion and an integral edge portion which projects from the anchorage portion and has an abutment part remote from the anchorage portion to abut against the edge of a tile, and a platform removably attached to the anchorage portion which projects towards the abutment part. The platform enables the trim strip to be adjusted for use with tiles of different thicknesses, and to allow for variations in section thickness of a tile. Thus, the platform may lift a thinner tile or tile edge off the anchorage portion into a position for abutting engagement of the abutment part with the tile, or the platform may be removed for a thicker tile or tile section to allow the tile to engage with the anchorage portion and still have abutting engagement with the abutment part. The platform may be formed integrally with, or be a separate element detachably connected to, the anchorage portion.

Abstract: An elongated "L" shaped plastic drywall corner strip containing two flat legs joined to form an acute angle, one of which is kerfed repeatedly to increase flexibility and allow installation over inside and outside arches, the outside of the legs having a surface to which joint compound adheres, and a solid bead overarching and/or interior arching the point of junction of the legs.

Abstract: In conventional drywall construction, a drywall sheet is installed on upright studs with a top edge of the sheet spaced below a top plate or track. A novel rigid trim strip of generally M cross section has a horizontal top lip or first leg resting on the top plate, an upright reveal portion or a second leg extending downward from the first leg alongside the top plate, a horizontal ledge portion or third leg extending outward from the bottom of the second leg and an upright fourth leg extending downward from the third leg alongside the drywall sheet. Finishing compound is applied to mask the fourth leg. The result is a uniform reveal along the upper edge of the drywall sheet.

Abstract: An elongate thin strip, with two similar flanges forming a 90.degree. angle, each flange having a shallow step whereby a recessed area for joint compound is provided, when used as a drywall inside corner bead.