A mix of red cedar shingles and scales make of the exterior. The design is intended to be a  Photo 8 of 9 in Boards, Battens, and Bevels: Wood Board Siding Types and Their Uses from This Minimal Japanese Getaway Was Built for Surfing

Boards, Battens, and Bevels: Wood Board Siding Types and Their Uses

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"Fancy cut" shingles are less common but equally effective in protecting interiors from the elements.