Spotting Hull Delamination

Why Is Delamination a Big Deal?

Your boat’s hull is constructed from layers of fiberglass or composite materials bonded together for strength and durability. Delamination occurs when these layers begin to separate, often due to moisture intrusion, prolonged stress, or improper repairs. This issue compromises the hull’s structural integrity and can lead to major safety concerns. Stories on /r/boating are filled with examples of minor cracks or bubbles in the gelcoat that snowballed into expensive repairs or catastrophic failures when left untreated.

How Does Someone Check for It?

Spotting hull delamination early can prevent costly damage and ensure your boat remains safe on the water. Here are some effective steps to identify potential issues:

• Perform a Tap Test: Use a small mallet or screwdriver handle to gently tap the hull. Listen for changes in sound—solid areas produce a sharp tone, while delaminated sections sound hollow.
• Inspect for Visual Clues: Look for bubbles, cracks, or bulges in the gelcoat. Pay extra attention to high-stress areas such as the keel or transom.
• Check for Moisture: If delamination is suspected, consult a marine professional who can use moisture meters to confirm water intrusion between layers.

By catching signs of delamination early, you can address problems before they lead to a complete hull failure or extensive structural repairs.

Rescuing a Mid-Size Runabout

Scenario: An attentive boat owner noticed a bulge forming along the side of his mid-size runabout. Concerned, he scheduled a marine survey that confirmed partial delamination caused by water intrusion. Over the winter, he had the damage repaired by professionals, restoring the hull’s integrity and preserving the boat’s resale value. By acting quickly, he avoided the potential for a catastrophic hull breach during the summer season.

Delamination Detection – Deck

Protect your investment by identifying hull delamination before it becomes a major issue. With Deck’s practical tips, you can stay ahead of damage and keep your boat in top condition.