What Is Outside Corner Molding?
Outside corner molding is a type of interior wall covering which consists of plywood or other rigid material placed inside the opening between two walls. These types of wall coverings are commonly found in homes with single-story construction, where they may serve as a barrier against rainwater infiltration into the home, provide insulation for the house’s foundation, and protect the structure from rot and decay.
The term “outside” refers to the area beyond the wall, while “corner” refers to the space between two adjacent walls.
Types Of Outside Corner Wall Coverings: Plywood & Other Resilient Materials
There are many different types of exterior corner wall coverings available today. They range from simple panels made out of wood or other rigid materials such as metal and concrete block, to elaborate designs like those made out of glass and porcelain.
Plywood is one of the most common types of exterior wall coverings used in houses. It comes in various thicknesses and finishes, but all plywood must meet certain specifications before it can be installed. Some plywoods have been treated with fire retardant properties, making them ideal for use around chimneys and other flammable areas. Plywood is typically painted to prevent warping over time. It’s also possible to have plywood finished with a wood veneer, or to stain and lacquer the surface for a more natural look.
Other types of resilient materials that are commonly used as outside corner wall coverings include hardboard, fibre-cement board, oriented strand board (OSB), and plastic lumber. Each of these materials is available in a number of different finishes, colours, and thicknesses. Newer types of plywood have a waterproof coating and are often used to protect the corners of the house from water damage.
Other types of resilient material include hardboard, particle board and medium-density fiberboard. These materials are typically less expensive than plywood, making them more cost effective for homeowners on a budget. However, they do not last as long and require more maintenance. For example, they will begin to deteriorate over time if exposed to direct sunlight without protection.
Another important aspect of exterior corner wall coverings is the fastening material. There are a number of different fasteners that can be used to secure outside corner molding material, including nails, screws, and specialized framing brackets. It’s important to use fasteners that are strong enough to hold the material in place, while also being long enough to go through the wall framing members.
Vinyl, aluminum, and fiber cement siding can also be used as outside corner wall coverings. These types of siding have become more popular in recent years due to their aesthetic appeal and long life span. Vinyl and aluminum siding are both light-weight, making them relatively easy to handle during the installation process. Fiber cement siding is heavier than vinyl or aluminum, but it has the added benefit of being fire resistant.
Nails are by far the most common fastener for outside corner molding. They are typically made of steel and available in a wide variety of lengths and thicknesses. The main disadvantage of using nails is that they have a tendency to work themselves loose over time, requiring re-nailing.
Screws hold better than nails, but are more expensive. Specialized framing screws have sharp threads that cut their own hole as they are driven into the wall framing.
Installing Outside Corner Molding
The first step in installing outside corner molding is to determine the layout of the wall. These screws are more expensive, but they don’t require a pre-drilled pilot hole.
Special framing brackets are also available to help secure the outside corner molding material. These specialized brackets can be nailed or screwed directly to the framing members. They provide an anchor point for screws or nails that secure the outside corner material. Measure from the floor up to the bottom of the top plate of the exterior wall, then mark each stud at that height using a felt tip marker. Be sure to measure and mark each stud in the area where you will be installing the outside corner molding.
The next step is to cut the pieces of outside corner molding so they fit between the studs.
Once the outside corner material is in place, it should be firmly fastened to the framing members using screws, nails, or specialized framing brackets. If screws or nails are used, they should be long enough to go through the wall framing members to provide a solid attachment.
Once the corner material is in place, caulk or sealant should be applied around the inside and outside edge. This will help keep out water and improve the overall appearance of the completed corner molding installation. If you are working alone, you can affix a piece of molding in place at one end, then use a level to help ensure it is evenly spaced from the floor and ceiling. Once you have one end secured, stand beside the opposite end and slide it into position. Have a helper hold it in place while you drive nails through the framing members and into the molding.
If the outside corner material does not have a tongues and groves design, self-adhesive flashing should be applied over the top of it to help keep water from getting behind it where it can cause rot.
Finally, touch up paint can be applied to the outside corner material to hide the fasteners and seams.
It is important to follow the manufacturer’s recommended installation instructions when installing outside corner molding. You can then use a tape measure to space it evenly from the floor and ceiling, then drive nails or apply caulk as needed.
Was this page helpful? Please let us know! Each type is a little different, so read the instructions that come with the materials you are using before beginning the project.
Sources & references used in this article:
- Corner insert for vinyl siding (TD Sciuga, SJ Sciuga, KJ Tupper – US Patent 5,974,748, 1999 – Google Patents)
- Prefabricated miterless corner moulding (EJ Hillmann – US Patent 2,915,794, 1959 – Google Patents)
- Inside corner insert for steel moulding (H Frank – US Patent 2,884,669, 1959 – Google Patents)
- Decorative moulding corner cap (B Lamont, D Rozon – US Patent 5,802,790, 1998 – Google Patents)
- Corner moulding and fastener (F Delise – US Patent 4,608,794, 1986 – Google Patents)
- Drywall corner-finishing accessory (JM Koenig Jr – US Patent 5,313,755, 1994 – Google Patents)
- Soft edge moulding (J Chmela, J Chmela – US Patent 6,044,601, 2000 – Google Patents)