A threshold is designed to provide a seal underneath the door, as a protection against heat and cold. It protects the interior from drafts that flow inside and also protects the interior from rainwater entering the building.
5" X 1/2" x 36"
ADA Compliant - These Thresholds have less than 1/4" Vertical Rise
Beveled rise slope no greater than 1:2 up to 1/2"
Ramps with slopes less than 1:12 meet the ANSI Spec A1171