How Do I Waterproof Plywood Decks and Roofs?

Plywood decks and roofs can be a great addition to any home, providing a flat surface for outdoor living and protecting against the elements. However, these surfaces can be susceptible to water damage, rot, and mold without proper waterproofing. Fortunately, there are several methods homeowners can use to waterproof their plywood decks and roofs.

The first step in waterproofing a plywood deck or roof is to ensure that the surface is clean and free of dirt, debris, and any existing water damage. This can be done by scrubbing the surface with a stiff-bristled brush and a cleaning solution, allowing it to dry completely.

Once the surface is clean and dry, homeowners can choose from several waterproofing options, including:

  • Liquid Waterproof Membrane: This type of waterproofing is applied as a liquid coating to the surface of the plywood. It forms a barrier that prevents water from penetrating the wood and is often used for decks and roofs. It can be applied with a paint roller or brush and typically requires several coats for maximum effectiveness.
  • Waterproofing paint: There are several types of paint specifically formulated for waterproofing decks and roofs, such as Acrylic based or elastomeric paint. It can be applied just like regular paint and will protect the wood from moisture while also providing a decorative finish.
  • Waterproof Membrane Sheet: This is a sheet material made of different materials such as rubber, PVC, or TPO that can be applied to the surface of the plywood, providing a durable barrier against water. This method can be a bit more complicated to install, but it often provides the most reliable protection.
  • Screwing on a metal flashing: This is the practice of adding a metal layer around the perimeter of the plywood sheet or where the different parts of the deck or roof intersect. This will prevent water from seeping into the edges and corners of the plywood.

Regardless of the method chosen, it is important to follow the manufacturer’s instructions and to apply the waterproofing in dry conditions to ensure maximum effectiveness. Homeowners should also plan to reapply the waterproofing periodically, as the protective barrier will wear over time.

In conclusion, waterproofing plywood decks and roofs is an important step in maintaining the longevity and integrity of these surfaces. With the right methods and materials, homeowners can protect their decks and roofs from water damage and enjoy them for many years to come. It’s also important to note that waterproofing should be done to new decks and roofs before usage.

SANI-TRED has been used by contractors and homeowners to permanently waterproof plywood decks and roofs. If you have any questions on roof deck waterproofing or on your upcoming project call our experts.

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