Gap Under Interior Door Threshold

Mike gn builders please cite the location of this ada requirement.

Gap under interior door threshold.

37 in x 4 625 in wood door threshold install with screws item 130223 model 45837oaksl45837oaksl. There is an approximately 1 5 gap at the bottom of the doors. But a gap of 1 5 inches seems excessive. I think it is too big and think a 1 4 1 2 gap would accommodate any unevenness in our floors and allow us to use area rugs.

There is a 1 5 inch gap between the threshold and the bottom of the wooden door. My contractor just hung our fancy dancy un painted solid wood door slabs in my 100 year old house with solid hardwood floors throughout. I ve just paid a series of professionals to measure order install and paint a pre hung exterior door.