Why you shouldn't use interior grade plywood at the exterior. #hometips

Using plywood where it can get wet is generally not recommended because plywood is a type of wood-based panel that is susceptible to damage when exposed to water or moisture for an extended period of time.

When plywood gets wet, it can absorb the moisture, causing it to expand and eventually warp, delaminate or rot. This can weaken the strength and integrity of the plywood, making it less reliable for structural or load-bearing applications.

Additionally, if the plywood is not treated or sealed properly, the water can penetrate the wood and cause it to rot, which can be a breeding ground for bacteria, fungi, and pests. This can lead to further damage and potential health hazards.

To avoid these issues, it's important to use appropriate materials for wet or humid environments, such as marine-grade plywood, which is specifically designed to resist water damage, or other types of materials like cement board or fiber cement panels, which are more moisture-resistant.

There are many types of plywood that are available to the public, each with its own unique characteristics and uses. Here are some common types of plywood:

Structural plywood: This type of plywood is designed for use in structural applications such as flooring, roofing, and walls. It is made with a combination of softwood and hardwood veneers and is available in various thicknesses.

Exterior plywood: This type of plywood is designed for outdoor use and is treated with water-resistant adhesive to prevent damage from moisture. It is commonly used for siding, decking, and roofing.

Marine plywood: This type of plywood is designed for use in wet or humid environments, such as boats and docks. It is made with waterproof glue and is usually made with high-quality hardwood veneers.

Interior plywood: This type of plywood is designed for indoor use and is not treated for water resistance. It is commonly used for furniture, cabinets, and decorative paneling.

Fire-retardant plywood: This type of plywood is treated with chemicals that make it resistant to fire. It is commonly used in buildings where fire safety is a concern, such as schools, hospitals, and public buildings.

Flexible plywood: This type of plywood is designed to be flexible and is commonly used for curved surfaces in furniture and interior design.

Aircraft plywood: This type of plywood is designed for use in the construction of airplanes and other aircraft. It is made with high-quality hardwood veneers and is designed to be lightweight and strong.

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