Drywall Corner Taping

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For many years the metal bead reigned over the majority of all corner bead applications. Introduced in the era of 'the strength of metal' it offered an edge that was durable, could be precut to fit, and was attached with nails. Not only that, but the predetermined angle has a rise on which to base the corner. The only drawback normally is found in terms of of making time with the install/achieving production, and the potential for cracking -- although taping crack repairs are a possibility. Still, metal is used on a vast number of 90 degree installs for outside corners.
Tradtional Metal Corner Bead

A bead for fixed angles, rigid vinyl offers some pro's over previous choices. Attached with nails, it shapes the angle, allows for rigidity, and pretty much wipes out the possibility of rust (except from nail heads). Also, damages to the corner aren't as threatening because they have an easier repair.

An alternative is paper tape lined with metal. Applied on inside and outside corners, the tape is conformed to off angles and this is its main advantage. Fold the center, apply over the mudd with your knife and press level. Although, when serving as an outer corner, there is no preformed edge on which to rest your taping blade, or for true edge protection. In addition, the hidden metal strips may complicate repairs that could translate to the replacement of a whole piece.

The flexible, composite tape offers strong benefits as an off angle solution. Cut by knife and feed by roll style, you apply it like paper tape only this flexes about the middle fold. It does offer corner protection (brand dependent) and the composite material resists breakdown of the fibers by sanding. Beginning tapers should take care in establishing the proper angles at which to set this type of tape in relation to the plane of the wall surface. There is a way to install corner bead angles.

Screwed Corner Guard Atop Bead

Caveat for outer corners
It is worth knowing the material beneath the finished corner, whether it is metal, tape, vinyl, etc for protecting finished corners with corner guards, that have a high exposure to impact.

Look in to the right fastening method; if screw type, these should be slim, to minimize loosening of the underlying bead. And attach only the right type of guards for your corners. Certain protectors are stuck on with peeled adhesive -- these prevent breaching the bead. But screw driven guards are more apt to hold.

See Also
Repair Corner Bead

Drywall Corner Topics

Mudding and Taping Drywall How to Install Corner Beads
Drywall Finishing Install Rounded Bullnose

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