CONSTRUCTION PLYWOOD GRADES AND BONDING TYPES
A times it is a daunting task for some people to make the distinction between the different grades of plywood though these are important features one should know during construction process. Asa matter of fact if by any chance you have been in the situation of purchasing you may have realize that these plywood comes in four grades.
The grades are represented by letters A, B, C and D where A represent those of high quality and D are those of lower quality. Despite the grading, all of them contain blemish to an allowed extend only that as the grading increases the blemish contained also increases.
Plywood grades are found in pairs. These pairs are in form of letters, one letter represent the face which is also called the better side while the other letter represent the back side. For example s sheet of grade A-C simply means the face is highly finished with the back side relatively unfinished. The grading is helpful in construction in that for example grade C-D would be the most preferable for structural purposes while another grade would be best for finish material.
Bonding is another important feature that is put into consideration when it comes to construction. There exist up to five types of plywood bonding depending on the glue applied for binding the plywood layers. Among the plywood binding types the most appropriate type to use will majorly be determined by what the material will be exposed to after the completion of installation process. Highlighted below are some of these binding types.
Marine plywood is considerate for plywood that is likely to be exposed to moisture thereafter. Here moisture resistance is the major concern. The type is made from the best quality grades, usually graded A. This is what makes this type more expensive as compared to others and is rarely found in the market. The function ability of this binding is confined to hardwoods used in environment which is moist. Conversely interior plywood make the best binding for interior use such as kitchen cabinets among others since there will be no moisture hence no need to incur extract cost of using plywood glue that are waterproof yet they are of no important in that context. This type is found in a number of grades that matches also quite a number of softwood and hardwood such as cherry and oak among others.
Exterior plywood is the most popular and available type in a home context. It is found in most grades with its glue being very much resistant to moisture as oppose to the interior plywood. Also this type is found in most hardwood species.
Sanded plywood is considered the most appropriate for projects and plans where the user needs one side of the plywood to be visible. This type is usually found as A-C bonding with the visible side sanded grade A while the invisible side is sanded grade C. On the other hand structural plywood is best where appearance is not much required but rather the material stability is of much importance. Resins used in this case have more binding power to prevent any chance of layer separation.