This type of flooring is stronger than single joist timber flooring. They are used over long spans of 3.6-7.5 meters and significantly block the travel of sound waves. Intermediate supports called binders are placed to bridge the joists. Binders are spaced approximately 2 m apart. Binder ends are placed on wood or stone blocks and should not be embedded in a masonry wall. Roofs can be fixed by placing a roof joist on the binder at the bottom of the binder. The lathing is fixed to the roof joists.
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