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The Technical Committee has discussed how to measure the exposed steel on insert runners as required by Specification E.2.h - Max. width exposed below wood runner body: 1-1/2" (38.1 mm) The Technical Committee believes the intent of the Spec is to limit the amount of exposed steel on insert runners. If this Spec is satisfied on a runner with wood body of minimum thickness, then the addition of wood or reinforcing material does not require the added material to be within the Specification measurement. A simple measuring gauge may be used to measure the amount of exposed steel on insert runners. The gauge should have a slot width at the minimum wood body thickness (7/8" or 22.3 mm) and depth at the maximum allowed exposure (1-1/2" or 38.12 mm) . This gauge is used as shown below to measure exposed steel. The top of the gauge should touch the bottom of the runner body. The edge of the steel may touch the bottom of the slot, or there may be a gap between the edge of the steel and the gauge. If the edge of the steel is touching the bottom of the slot and both top edges do not touch the bottom of the runner body, then the exposed steel is greater than the maximum allowed. Notes: a) Because it is impossible to determine the thickness of any reinforcement on the bottom of the runner body, the gauge should be used to measure to the outside of the reinforcement. b) This gauge should not be used on the front 6" (152 mm) of the runner (where Spec E.12 allows the body thickness to be reduced below 7/8"). c) Allowance should be made for small imperfections (porosity, damage, etc) on the bottom surface of the runner body. |
