Final answer:
In construction standards, the floor or landing by an exterior door should not be more than 1.5 inches below the top of the threshold to ensure safety and accessibility.
Step-by-step explanation:
The question pertains to the construction standards for landings by exterior doors. According to building codes, the floor or landing on each side of each exterior door should not be more than 1.5 inches below the top of the threshold. This requirement is in place to ensure safety and accessibility at entrances.
It's important for the landing to be within this height range to prevent tripping hazards and to accommodate for wheelchairs, if necessary. The local building code may have specific requirements, but as a general rule, the 1.5-inch maximum difference is commonly accepted.
According to building codes, on each side of each exterior door, there should be a floor or landing. The floor or landing should not be more than 1/2 inch below the top of the threshold.
This ensures a smooth transition from the exterior to the interior of the building and minimizes tripping hazards.