Plywood for Bathrooms & Wet Areas | Moisture-Resistant Panel Guide
- Cabinet Timbers
Choosing Plywood That Withstands Moisture
Not all plywood panels are created equal. Thicknesses and size dimensions aside, even the construction and composition of plywood panels can vary greatly, which means that woodworkers, carpenters, and contractors need to possess a strong understanding of the characteristics and qualities of the wood panel products they’re working with.
Accounting for specific qualities of wood composite materials becomes increasingly important, however, when you’re looking to undertake projects involving the construction of wet areas across both interior and exterior environments.
Although plywood isn’t 100% waterproof, there are particular types of treated plywood that are suitable for constructing outdoor furniture, exterior cladding, and even boats. And when it comes to residential and commercial construction, these plywood types are also well-suited to building bathrooms, kitchens, and other wet areas.
Today, our experts at Cabinet Timbers will outline some of the most suitable plywood types to be used for waterproof bathroom panels, bathroom cabinets, and other components of constructing wet areas.
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Best Types of Plywood Panels for Bathrooms and Wet Areas
The below plywood types are most commonly used for waterproof bathroom panelling, bathroom cabinetry, and for constructing other elements of bathrooms, laundries, kitchens, and wet areas across domestic and commercial construction projects.
Exterior & Marine grade plywood
Manufactured to meet the AS2271 Australian Standard, our exterior-grade plywood is resistant to delamination when exposed to moisture, ensuring strong dimensional stability across both exposed and semi-exposed exterior environments. This durability also makes our exterior-grade plywood suitable for constructing interior wet areas like bathrooms.
Manufactured with Australian-grown Hoop Pine, our exterior-grade plywood is 100% sustainably sourced alongside being uber durable, and cost-effective when compared to other more premium plywood products like birch plywood.
It’s important to note that plywood shouldn’t be in direct contact with water and that all plywood in high moisture areas should be sealed
Moisture-resistant MDF
Although MDF boards aren’t technically a plywood panel as they’re made with wood fibres rather than timber plies, these composite wood panels still offer durability and strength, thanks to their dense construction. With a quality resin bonding to support superior moisture resistance, MDF board can also be a great material for constructing wet areas.
Melamine
Like MDF, melamine panels are another type of particle board rather than a traditional plywood. The difference between MDF, particle board, and melamine is that melamine boasts stylish melamine sheets laid on a wood composite core. These sheets are available in a wide variety of colours, textures, and finishes, ranging from matte designs to glossy or satin look styles, and even wood grain options.
The versatility of melamine is what makes this material a popular choice amongst interior designers and architects. In terms of moisture-resistance, melamine performs exceptionally, offering superior performance in moisture-rich environments. Melamine sheets are also naturally mildew resistant, making them ideal for installation in environments with fluctuating humidity levels.
Plywood for Bathroom Vanities and Cabinets
The plywood types we’ve outlined above can be used for most elements of bathroom and wet area design. However, when constructing bathroom vanities, cabinets, and other functional elements that must also be highly presentable, it’s best to opt for melamine and treated moisture-resistant MDF and plywood over lower-grade structural plywood for bathroom fixtures and furnishings. There are a few key reasons for this, which we’ve outlined below:
- Warp-resistant veneers and melamine sheets support durability in moisture-rich environments
- Superior A-grade resin bonds support high-performance moisture-resistance
- A-grade timber veneers also simplify painting and sealing, as plywood surfaces boast no imperfections like voids, cracks, or bumpy knots
Generally speaking, the best choice of plywood materials for bathroom vanities and cabinets are marine plywood or melamine measuring at 16-18mm thick, with waterproof paint coatings, polyurethane coatings, or laminate to support moisture resistance.
Waterproofing and Sealing Plywood – Key Methods
Although plywood isn’t 100% waterproof, there are methods used by timber manufacturers to ensure plywood, MDF, and melamine to be used for bathroom wall panels, vanities, cabinets, and other visible, functional fixtures, can stand the test of time.
Here are a few of the key methods used for waterproofing and sealing plywood to be installed in bathrooms and wet areas:
Edge sealing
Whilst moisture can roll directly off plywood faces, edges are more vulnerable to moisture retention. Epoxy sealants or polyurethane coatings can be applied to edges to ensure plywood surfaces are fully sealed.
Waterproof paints and varnishes
For plywood faces, quality waterproof paints and marine-grade varnishes can also be applied to protect surfaces. Multiple coats are generally required to ensure thorough, long-term sealing.
Tile underlays
For floor and wall tiling, fibre cement or cement backer boards can be installed over plywood for further protection whilst still ensuring strong structural integrity.
Professional installation
With professional construction teams, you can rest assured that your plywood will be installed responsibly, treated with the right waterproofing and sealing methods, and with adequate ventilation to reduce risks of moisture ingress.
Australian Standards for Wet Areas
As is the case with all construction projects, working with plywood for wet area construction must adhere to a few relevant Australian Standards to ensure compliance with local and national building codes and regulations.
The following Australian Standards must be followed when working with plywood for bathrooms and wet areas:
- AS3740 – Waterproofing of domestic wet areas
- AS/NZS 2269 – Plywood – Structural
- AS2271 – Plywood and blockboard for exterior use
- AS1684 – Residential timber-framed construction
Before commencing construction work for wet areas in residential projects, make sure that your construction team is well-versed in at least the four standards outlined above, as well as local, state and federal building codes and regulations relating to the construction of wet areas.
Secure Moisture-Resistant Plywood Panels for Your Bathrooms, Kitchens, and Other Wet Areas
Selecting the right plywood types for constructing bathrooms and wet areas demands a strong understanding of the properties of different plywood materials, paired with a working knowledge of plywood waterproofing and sealing methods, and all the relevant codes and regulatory requirements that must be met when working with plywood in wet area construction.
For more information on our marine-grade plywood and the other plywood types we’ve recommended today, don’t hesitate to get in touch with our team at Cabinet Timbers to discuss our plywood product range and price list further. Call (03) 8353 2222 today or leave an enquiry via our website to receive a direct response from a member of our team.
