The two principal methods of traditional planking are lapstrake and carvel. The greatest difference between the two is the way the seams are shaped and fastened to prevent water from passing through. The watertight integrity of a lapstrake seam depends largely on the accuracy of the beveling of the lapped area. The accuracy of the profile (edges) of the plank, while important to the look of the boat, is not what keeps the water out. In contrast, shaping the edges of carvel planking is the key to a seam that will remain tight over the years.
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