Traditional Korean floor 대청마루 ( daecheongmaru) PART I -a wooden floor without nails, screws or glue

Traditional Korean carpenters displayed thier skill and understanding of wood most expertly in the traditional 대청마루 Daecheongmaru floors found in so many Hanok houses.
A detour from the whole wooden floor process seen in much of the world, the floor boards are not cut into slim strips and nailed down to prevent their movement. Neither is there a sub floor and seperate finish floor. The Korean craftsman left the boards as large and wide as they could, and instead of controling their movement by cutting them down thin and nailing them in place, there were held within a groove cut into the joists, leaving the boards free to expand and contract as needed, but unable to cup or distort, much like a panel frame door.
Japanese joinery was used in our case to lock the floor beams and joists together.
There are various regional variations on these floors, and many ways they could be accomplished. We chose a simple dovetail groove with board ends cut at a mathing angle to be the best for us. Individual boards are further joined together with dowels.
Much thanks to Jay C Whitecloud, whose patient instruction and explaination were invaluable in this endeavor.

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