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BoatworksToday · video

Fitting Structural Coosa Bulkheads WAY Better Than Factory!

15 March 2026 · 18 min · 17K views

Man fits OSB bulkhead into curved sailboat hull

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What this video covers

Andy replaces structural bulkheads by first creating templates from OSB before cutting the final panels from Coosa board.▶ 3:05 To ensure a precise fit without creating hard spots against the hull, he cuts the templates with a slight gap, aiming for a fit that slides into position without requiring force.▶ 3:53 He uses a laser level to ensure the new bulkheads are plumb and square, which simplifies the future installation of a door frame.▶ 16:01 When transferring the template shapes to the expensive Coosa panels, he aligns the straight edges with the factory edge of the material to maintain structural integrity and minimize waste.▶ 13:34 He notes that while the bulkheads should touch the hull for support, they must not be wedged in, as forced contact creates localized stress points.▶ 4:12 The process involves iterative trimming and fitting until the panels achieve a tolerance within 1/16th of an inch.▶ 16:29

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