Drywall finishing system

Abstract

A non-slip, nocoat drywall finishing system for finishing inside and outside corners of any angle, the finishing system being a preformed, continuously extruded trim piece comprising a semi-rigid member that can be relatively thick in the center and tapers laterally to a thin edge. An outer finishing layer of fibrous material that directly receives paint or texture. A pattern of protrusions, ridges, or grooves on the inner surface of the semi-rigid member to avoid the need for an inner material layer. 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. Once, the piece is in place, the edges are feathered once with a small amount of mud and a wide blade. At that point the corner is complete except for drying.

What is claimed is:  
     
         1 . A non-slip nocoat drywall corner product for finishing drywall wallboard joints comprising: 
 an elongated semi-rigid support member continuously co-extruded with a finishing layer to form a pair of flanges, said support member having a centerline and two edges, said support member having a grooved hinge running end-to-end along said centerline, whereby said flanges fold about said grooved hinge to match any wall joint angle;    said co-extruded finishing layer being of fibrous material and covering an outer surface of said semi-rigid support member, said finishing layer directly receiving paint or texture without sanding;    an inner surface of said semi-rigid support member containing a plurality of protrusions, said protrusions penetrating into wet drywall mud between said drywall corner product and said wallboard, whereby said corner product resists slipping while said drywall mud drys.    
     
     
         2 . The non-slip, nocoat drywall corner product of  claim 1  wherein said flanges taper from a maximum thickness along said centerline to a minimum thickness along said edges.  
     
     
         3 . The non-slip, nocoat drywall corner product of  claim 2  wherein said co-extruded finishing layer extends beyond the edges of said semi-rigid support member.  
     
     
         4 . The non-slip, nocoat drywall corner product of  claim 1  wherein said co-extruded finishing layer is cup stock paper.  
     
     
         5 . The non-slip, nocoat drywall corner product of  claim 1  wherein said semi-rigid member is high impact polystyrene.  
     
     
         6 . The non-slip, nocoat drywall corner product of  claim 1  wherein said protrusions form a wave pattern.  
     
     
         7 . The non-slip, nocoat drywall corner product of  claim 1  wherein said protrusions from a cross-hatch pattern.  
     
     
         8 . The non-slip, nocoat drywall corner product of  claim 1  wherein said protrusions are pointed.  
     
     
         9 . A drywall corner finishing product of the type used to finish drywall corner seams in modern construction comprising a semi-rigid plastic member co-extruded with a paper layer on an external surface, the cup stock paper layer directly receiving paint or texture after the product is installed, the semi-rigid member having a pattern of pointed protrusions on an interior surface, the semi-rigid member also being tapered from a maximum thickness along its centerline to a minimum thickness along its edges.  
     
     
         10 . The drywall corner finishing product of  claim 9  wherein the semi-rigid member is high impact polystyrene.  
     
     
         11 . The drywall corner finishing product of  claim 9  wherein the paper finishing layer is cup stock.  
     
     
         12 . The drywall corner finishing product of  claim 9  wherein the paper finishing layer extends beyond the edges of the semi-rigid member.  
     
     
         13 . The drywall corner finishing product of  claim 9  wherein the pointed protrusions run vertically.  
     
     
         14 . The drywall corner finishing product of  claim 9  wherein the pointed protrusions form a cross-hatch pattern.  
     
     
         15 . The drywall corner finishing product of  claim 9  wherein the pointed protrusions form a wave pattern.