Notches in roof partition rails - take multiplex strips joining rails to planks and have trapezoidal or triangular outline

摘要

Prefabricated roof partition structure comprises rails and planks fitted together by tongued and grooved joints. Between two rails (1) are a number of planks (2, 3) joined together and to the rails by multiplex strips (4). Above the point of join with the planks, the rails have notches (6) which take the multiplex strips (4). The notches have an outline of a straight trapezium or a right-angled triangle with a height which is greater than the thickness of the multiplex strip. Normally, there are three planks in the structure between the rails.