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

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Mr. Chickadee
Published at : 27 Nov 2020
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In this video we finish our traditional wooden floor without nails by adding the floorboards themselves to the joists we prepared in the last video.

This floor is our own version of a korean 우물마루 (umulmaru) technique. Our technique differs from classical korean in the use of japanese joinery and a sliding dovetail to hold the boards.

There are many ways one could accomplish this style of flooring, we chose a method we found to be the best for us, to carve a simple dovetail rebate into each joist then carefully match the ends of the floorboards to this angle. The dovetail prevents any cupping or movement of the boards but allows expansion and contraction and any size board to be used. Other methods used in Korean floors are a simple tongue at the end of each board and a groove carved into the joists to receive it.

To get the boards into the groove, a larger slot is cut out on one end of each joist, letting the boards drop down and slide forward. As the final "capping board" is not restrained by the dovetail rebate as all other boards are, its important that it is a very tightly fit quarter sawn board, as a quarter sawn board should remain the most stable and resist the temptation to cup over time.

A few important points on this floor to remember;

1. all boards are placed bark side up (outside of tree facing up) as is the custom in many asian traditions

2. Either green boards or air dried are best, not kiln dried, as a kiln dried boards may swell exponentially in subsequent humid summers and could actually rupture the buildings frame. If kiln dried wood is used it would be wise to plan for and accomodate any excessive expansion with extra covered space on one end of the rows, or the most simple solution, to utilize "galloping joists" which sit atop the carrying beams instead of flush with them.
Our floor is semi dry, boards being milled and air drying 6 months. As they continue to dry they can be tightened up.

3. Capping boards should be either single large quarter sawn boards, or made up of several slimmer quarter sawn peices joined together.

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timber framingkorean floorgreen woodworking

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