This door is suppose to sit directly over aluminum threshold, but the door sits behind the threshold. The existing aluminum threshold is 4" wide.
This poor detail is a major source of heat loss in winter and heat gain in summer. There is no insulation or thermal breaks anywhere around this door.
The top of the aluminum threshold is less than 2 1/4" above subfloor while the bottom of the door is 2 3/4" above subfloor. The neoprene door bottom should fit tightly between the door and threshold. This door bottom will barely come into contact with the finished wood floor allowing 1/2" of outdoor air inside. This is a very poor detail.
Architectural sketch of existing bad threshold detail. Note the neoprene door bottom never comes into contact with the aluminum threshold.
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