Loose Threshold Joint
Most Benchmark thresholds are a two-piece assembly. If the joint line between the two parts is loose and rattles try injecting caulk into the joint. Experienced workmen may opt to try hammering along the joint to deform the aluminum just enough to tighten the fit, figure 15.

Detached Threshold
If the threshold seems to bounce or deflect downward when stepped on, it may be detached from the sub-flooring. The adhesive bond may have failed. If this is the case, anchor the threshold to the subfloor with several 11/2" self-tapping screws, figure 16. Countersink the screw holes so that the screw heads will be flush with the top of the threshold. If the screws fail to engage, carefully inspect the floor on both sides of the door for signs of water damage. If the flooring has rotted under the door, this is a serious condition and will require complete removal of the door and frame unit. See Section 7 for instructions.