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Marine plywood has long been used in boats and coastal structures — but despite its name, it often fails prematurely in wet environments.
Understanding why plywood breaks down is the first step to choosing better alternatives.
Marine plywood uses:
However, it is still wood‑based — and wood and water are fundamentally incompatible over the long term.
Moisture enters marine plywood through:
Once water enters, it becomes trapped between veneers, leading to internal decay.
Rot often begins below the surface, meaning:
By the time damage is visible, replacement is usually the only solution.
Even with:
Plywood relies on perfect protection, indefinitely — which is rarely achievable in real‑world marine conditions.
Premature failure leads to:
This is why many specifiers now design out timber entirely in wet environments.
Explore how composite core materials eliminate rot and moisture failure altogether.
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When Finol Oils needed an ageing flat roof brought back into service without a strip-out, Connolly Fibreglass turned to TriRoof FLEX. Discover how 240m² was overlaid in a single week, fire-rated to BROOF(t4) and backed by a 20-year materials guarantee.
Explore TriRoof’s full range of liquid roofing solutions, from advanced overlay systems to seamless coatings. Designed to deliver flexible roof performance, durability, and long-lasting protection for both new builds and refurbishment projects.
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