What is the industry standard on exterior steel doors and water resistance?

SDI 127H contains information on water penetration. In summary, door assemblies are not manufactured to be watertight. Seals and thresholds are required to ensure water resistance of the opening assembly in normal environmental conditions. In situations where water penetration is a concern, the contractor must seal all joints that are exposed to the elements after the frame assembly is installed. Whenever possible, it is strongly recommended that glass and glazing be installed on the exterior rabbet of the frame assembly.

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