US2313990A

US2313990A - Wallboard joint system

Info

Publication number: US2313990A
Application number: US389909A
Authority: US
Inventors: Dean D Crandell
Original assignee: National Gypsum Co
Current assignee: National Gypsum Co
Priority date: 1941-04-23
Filing date: 1941-04-23
Publication date: 1943-03-16
Anticipated expiration: 1960-03-16

Description

M r 9 D. D; CRANDELL 2,313,990

WALL BOARD JOINT SYSTEM Filed April 25, 1941 INVENTOR DFA/V 0. (RAM 05M ATTO NEY5 Patented Mar. 16, 1943 wanmoaitn Jomr SYSTEM Dean D. Crandell; Buflalo, N. assignor to Na: tional Gypsum Company, Buffalo N. Y.

Application April 23, i941 ,seria'1 No. 389,909 6 Claims. '(Cl."l216) 'This invention relates to building wall constructions and particularly to'jwall constructions composed of individual panel sections mounted with their edges in abutting relation, whereby a joint is formed over which it is desired to place a concealingand reinforcing member.

'Hereto'fore it has. been proposed to use paper tape having feathered edges and having a strength along one axis greaterthanthe strength along an axis at right angles thereto As it is customary to place cement under this tape and in many instances'over the tape whereby the same-becomes damp, the tape is subject to shrinkage with the result that hair-line cracks develop alongthe edges.-

It has also been suggested'toemploy perforated metal strips as joint reinforcing members. How-' ever, a construction in which a metalstrip' of' this type is employed does not dry out' properly due to the fact that the impervious metal tape seals moisture thereunder and the joint cement dries imperfectly and irregularly;

It has also been proposed to'use, wire fabrics as joint reinforcing members. In addition to the excessive thickness of the fabric which renders it extremely difficult to produce a decorative ef feet over this type of reinforcing member. withnut'the necessity of plastering, 'it is diflicult to form such tapes intoreinforcing elements suitable for use for interior or exterior corners. In

addition, these tapes are'very costly and are not economical in use. Y

It is an object of the present invention to provide a joint reinforcing member and a wall constructlon employing the same wherein substaniially all of the defect of the prior reinforcing members and resultant constructions are eliminated.

V It is also an object of the invention to provide a reinforcing joint member possessing a tensile strength considerably greater than the tensile strength. of acceptable members heretofore proposed. Y j y y It is an additional object of the invention to provide a joint reinforcing element or member that i impervious in itself to moisture and yet pe'rmit's ready evaporation of moisture therethrough and a member which is flexible and resilient and an element in fabric form which is not subject to the shrinkage encountered heretofore in the use of the available types of fabrics.

According to the present invention novel means are provided for treating the joints or cracks between adjacent substantially abutting panels in such a wayas to conceal such joints or' cracks and provide reinforcement thereacross as well as to facilitate painting or decorating the surface of the wall formed by the panels without the necessity for applying a coat of plaster or emplaying other means for rendering the joints or crackspermanently invisible, The novel means which the present invention affords comprises a tape or ribbon of novel construction for securement over joints or cracks by adhesion or the like.

In its preferred form the tape or ribbon comprises a' body'formed of a strip of glass fabric, that is, a strip of woven textile or the like material formed fromv threads of spun glass. In another form my improved joint reinforcement may comprise a conventional textile fabric including, partially, spun glass threads. Specificaliy, I have found that satisfactory results maybe attained by using ordinary cotton or other usual textile fiber for the warp threads running longitudinally of the tape, with glass threads comprising the weft threads running transversely of the tape. In one contemplated form of the'pres'ent invention the individual threads comprising the glass fabric are coated, usually by spraying or dipping, with either ,a thermo-plastic or a thermo-settlng resin. The resin employed may be either natural or synthetic. significant advantages are gained by the use of the fabric woven of wholly or partly spun glass threads due to its lack of stretch and also due to its non-absorbent nature and its chemical inertness.

. When used, the resin coating is of'such thickness, with respect to the count of the fabric and the diameter of the individual threads, as to leave the finished article porous. That is, the resin does not'tend to produce a flat impervious ribbon. When the glass fabric is coated with resin as contemplated in one form of the present invention the tendency'of warp and weft threads to shift relatively to each other under strain is even more thoroughly eliminated than by the use of an uncoated strip of glass fabric although certain of the advantages of the present invention may be attained without coating the glass fabric.

In the drawing: I v Fig. l is a perspective view of a wall construction embodying the principles of the present invention and with portions broken away for clearness; and v Fig. 2 is a cross-sectional view, on a greatly enlarged scale, of a piece of crack covering material constructed in accordance with one form of the teachings of my invention.

vIn the drawing like characters of reference denote like parts and the numeral l designates wall boards secured to building framework which may be in the nature of studding I l. The securement of the wall boards may be by any means conventional in the art. In the drawing nails 12 are shown for providing such securement. A seam ii of varying width will generally appear at the point of approximate abutment of adjacent panels l0.

The improved joint reinforcing tape I4 is placed over the Joint l3 whereby the marginal edges of the tape engage the abutting wall boards. Generally, joint [3 will be filled with a joint filler cement of any conventional type or composition and in addition a layer of the cement is spread over the exposed surface of the reinforcing memher M. In general, the layer of cement over the exposed surface of the reinforcing member I4, indicated at IS in Fig. 1 of the drawing, will be thinned out at the edges on application or sanded I down in order not to form a heavy or jagged edge which might be exposed through a decorative coating of, for instance, paint applied over the wall board and the joint system.

The improved Joint tape may also be employed as a reinforcing element without the necessity of filling open joint l3 with joint filler. cement due to the superior strength, rigidity and yet inherent flexibility of the fibers from which the tape is made. In such an instance the tape is applied and held in place with a suitable type of glue, as, for instance, a casein base glue or other suitable glues.

The improved joint tape reinforcing element is, in one form, made of glass fiber woven to the desired mesh size and using individual fibers of the desired thickness. In general, the total thickness of the tape should not exceed about 0.015, and the tape found most satisfactory will have a thickness bf from about 0.009 to 0.012 of an inch. It is to be understood that the mesh of the fabric is preferred to be relatively open. I have found a mesh of, around 14 threads to the inch highly satisfactory.

Although the woven glass fabric is eminently suitable as a joint reinforcing element by itself, under some conditions it may be desirable to add additional rigidity to the tape in order to prevent any suggestion of sagging of the tape in the joint in instances where the joint may he of conpull exerted in a direction transverse to the extent of the tape or, so to speak, across the Joint.

The foregoing specific description is not to be considered as limiting the scope of my invention thereto, or otherwise than as defined in the appended claims.

What is claimed is:

1. In a wall construction, a supporting member, panels secured fiatwise against said supporting member in substantially edge to edge relation to form a wall board joint, and a tape of spun glass threads woven to form a fiat fabric placed over said joint, said tape being attached to the outer surface across the edges of adjacent panels with an adhesive bonding agent.

2. In a wall construction, a {supporting member, panels secured fiatwise against said supporting member in substantially edge to edge relation to form a wall board joint, anda tape of spun glass threads woven to form a flat fabric placed over said 'joint, said tape being attached siderable width. In order to produce a tape of interstices are not clogged with the glue or cement.

The relative proportion of fiber or thread thickness, pitch of threads, and coating thickness, when a coating is used, are all shown in a preferred form in Fig. 2 of the drawing. In

Fig. 2 the numeral I 8 designates warp and weft threads of. glass and the numeral l9 refers to the coating applied thereto. I

While the embodiment specifically described has been referred to as comprising glass threads en'- to the outer surface across the edges of adjacent panels withan adhesive bonding agent, the diameter of the threads of the fabric being less than the pitch of adjacent threads so as to leave substantial interstices therebetween.

3. In a wall construction, a supporting member, panels secured flatwise against said supporting member in substantially edge to edge relation to form a wall boardjoint, and a tape of spun glass threads woven to form a fiat fabric secured over said joint, the threads of said fabric being provided with a surface coating of a stiffening agent.

4. In a wall construction, a supporting member, panels secured flatwise against said supporting member in substantially edge to edge relation to form a wall board joint, and a tape of spun glass threads woven to form a fiat fabric secured over said joint, the diameter of the threads of the fabric being less than the pitch of adjacent threads as to leave substantial interstices therebetween. said fabric being provided with a. surface coating of a stiffening agent of such thickness as not to fill said interstices.

5. In a wallconstruction, a supporting member, panels secured fiatwise against said supporting member in substantially edge to edge relation to form a wall board joint, and 'a tape of woven fabric placed over said joint and secured ,across the edges of adjacent panels with an adhesive bonding agent, said tape having weft threads of spun glass.

6. In a wall construction, a supporting member, panels secured fiatwise against said supporting member in substantially edge to edge rela-