Marine-type plywood products are used heavily in construction and within building interiors where durability, high moisture resistance and structural stability are critical. A frequent topic of interest that homeowners and building professionals encounter is the longevity of marine-grade plywood against termite infestation and fungus. No wooden product manufacture is immune to infestation or growth; however, if properly manufactured, installed and maintained, marine type plywood possesses a significantly higher degree of resistance than plywood.
How Marine-Grade Plywood Resists Termites Naturally
The natural ability of marine-grade plywood to resist biological threats is directly related to its internal structure.
- Manufactured with dense hardwood veneers, it is difficult for termites to penetrate through.
- The compact grain structure provides little means of access for insects.
- There are fewer internal voids, therefore less nesting opportunities for pests.
- Marine-grade plywood does not retain moisture as much as standard plywood so there is less opportunity for termite activity.
- Due to the higher density of hardwoods as opposed to softwoods, it is less attractive to termites.
How Waterproof Adhesives Prevent Fungal Development
The application of high-performance bonding systems in marine-grade plywood products gives added internal protection when used in marine applications.
- The use of waterproof phenolic resins creates a barrier for moisture escape between the layers.
- Prevents internal pockets of moisture, which promote the development of fungi.
- Prevents delamination of the veneer and bonding layer, which favour humidity to accumulate.
- Provides maintained bonding strength through prolonged periods of immersion in water.
- Through controlling moisture migration, the risk of fungal growth is minimised.
Role of Preservative Chemical Treatment
Most marine-grade plywood is treated with preservative chemicals during the manufacturing process, providing an additional barrier against pests.
- Preservative chemicals penetrate the veneer layers deep within the material.
- Create a chemical barrier to termites, borers and fungal microbes.
- Increase marine-grade plywood durability when exposed to high humidity environments.
- Increase the resistance of treated marine-grade plywood to pest infestation compared to untreated plywood.
- A chemical preservative treatment is of great value when utilized in kitchens, bathrooms, balconies and coastal properties.
Best Practices for Installation and Maintenance
Properly installed marine-grade plywood products provide an additional layer of protection.
- Sealing edges of the marine-grade plywood prevents moisture and moisture-related deterioration.
- Providing adequate ventilation reduces humidity levels in a structure.
- Providing support to install marine-grade plywood and keeping it away from water contact or a damp ground.
- Timely repairs of any leaks in a structure shall enhance the life of marine-grade plywood.
- Routine inspections will enhance the early stages of roof or floor failures.
- As a rule, care should be taken to provide consistent protection throughout the life of marine-grade plywood.
Practical Physical Limitations to Marine-Grade Plywood Products
Similar to all wood products, marine-grade plywood products both high and low-grade have limits.
- Standing water over long periods will nullify the protective nature of a product.
- Poor ventilation systems create additional risks of fungal growth.
- Failure to properly maintain marine-grade plywood products will lead to shortened product life.
- Utilising and maintaining marine-grade plywood products in balance will ensure the longevity of the products.
When purchased from reputable manufacturers such as Royale Touche, purchasers can be certain the products have the same preservative treatment, bonding quality and a predictable level of performance in demanding conditions, which will provide protection over the long term.