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Plywood purchase

09 Sep

I purchased my first series of plywood for the construction of the bulkheads, frames, keel and stem.     Finding the marine grade wood I wanted required a number of hours of research.     There are a number of fine sources for plywood but I had a time of it figuring out the plywood I needed.  My French building plans call for plywood in mm sizes and specified the number of ply’s with several options as to actual wood material.    The Ebihen 15 calls for marine grade moabi, sapelli, sipo or equal.    I did find Sapelli (sapele) wood which is very expensive in comparison to other US sourced marine plywoods.   I could not source sipo or moabi plywoods.   The majority of boat building plywood available from local sources are Douglas Fir, Okoume, Meranti, and Sapele.    Douglas Fir was ruled out based on the large number of comments concerning the quality of this plywood and the problems douglas fir has with checking.   Checking occurs when the underlying grain of the wood shows through the finished paint.

I limited my choices to either Okoume or Meranti.   Okoume is the better choice if light weight is paramount in the construction.   Meranti has better structual strength but is also 20% heavier.  My intent with this boat is to have a stable cruiser and not a racer so more weight in the structure for me is not a liability.   I ended up picking the Meranti.   I figure my boat will be about 80 lbs heavier with this wood.     I probably will purchase Okoume for the hull planking for both it’s lighter weight and easier bending ability.   I am happy with my choice of Meranti for the structual components.

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1 Comment

Posted by on September 9, 2009 in Building Stage

 

One response to “Plywood purchase

  1. Thomas Stearns

    October 14, 2009 at 3:48 pm

    Sir: I have used a great deal of Meranti in building small sailboats. The weight can vary by 1/3 or more from panel to panel–some Meranti is quite light, close to Okume in density , and other is quite heavy.

    I urge you to examine the cut edges of your structural parts to verify the integrity of the lamination. Sand the edges to remove any disturbed material and look carefully for evidence of separation between plies particularly the outer plies. If you experience unexpected chipping or outer ply failure when you drive screws thru the material it’s likely you have low bond.

     

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