Knucklebones, also known as astragals or beaded molding, are used for decorative purposes and creating airtight seals. They come in various sizes and materials and can be installed easily. Talus, a type of knucklebone, aids in creating a smooth seal and weather resistance. Proper installation and preparation of the underlying surface is important for a flush and attractive look.
A knucklebone is a type of molding that can be used for everything from decorative purposes to creating an airtight seal between two doors. Astragals are among the simplest profiles to model and appear in many different types of design and aesthetic schools, sometimes in interesting variations. Mold companies typically make knucklebones, and it is also possible to hand cut this mold for specific projects.
Viewed in cross section, a talus consists of a half round of material, sometimes known as a bead, with a flat strip known as a purfling on either side. Knucklebones are sometimes called beaded molding or semi-circular molding due to the distinctive bead in the molding, and the bead itself can be carved and decorated. Some notable examples of knucklebones can be seen in many works of classical architecture, and this molding is also widely used in decorative frames and furniture mouldings.
A talus is installed on one pair of ports to aid in the formation of a smooth seal. Talus makes the door more weather resistant and also helps with fire and sound resistance. The molding is mounted on one of the doors so that it overlaps the other when the doors are closed. Door knuckles can also be installed under doors to create a lip that will also help buffer noise and create a good door seal.
This type of molding comes in a range of sizes and materials, including many types of wood along with plaster and plastic. When used decoratively, an astragalus can add texture and depth and can alleviate an otherwise dull or bland viewing experience. The knucklebones can also be used to create a smooth lip that will smooth out sharp edges, reducing the risk of injury from objects such as cabinets and furniture. This convex molding typically comes in flat strips designed to fit flush with a surface.
Installing moldings is usually not very challenging. It is important to ensure that the molding is level when being installed and if it is necessary to join two pieces of molding to span the full length, the joining should be done in an inconspicuous place. The underlying surface should also be prepared by sanding and grouting if necessary to ensure it is smooth and even so that the molding will adhere properly. Taking the time to make sure the molding is flush will ensure that it looks attractive.
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