| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult to cause disadvantage that a heating medium pipe is damaged when a nail for fixing floor plate materials is driven into a portion between auxiliary joists or no floor plate material can be fixed to a floor heating panel.SOLUTION: Two auxiliary joists 7 parallel to a longitudinal direction are embedded longitudinally between both front and rear end faces of a panel body 6 with space therebetween. When a longitudinal width of each of the floor plate materials 2 arranged longitudinally on the panel body 6 is b, and a longitudinal length of the panel body 6 is L, there is the relationship of L=N×b (N is an integer of 2 or more). When a distance from a front end face of the panel body 6 to a front end face of a first auxiliary joist 11 disposed on the front side is l, and a distance from a rear end face of the panel body 6 to a rear end face of a second auxiliary joist 12 disposed on the rear side is l, there is the relationship of l+l<b. When a distance from a rear end face of the first auxiliary joist 11 to a rear end face of the second auxiliary joist 12 is l, there is the relationship of l=b. |
