Adjustable rail assembly for exterior door still assembly and components for the same

A modular exterior threshold and door sill assembly for an entryway, wherein the entryway includes a pair of vertically extending jamb members, a header structure and at least one door, comprising:

• an elongated sill assembly connected at opposing ends to the pair of vertically extending jamb members, wherein the elongated sill assembly includes a longitudinally extending sill base having a leading edge and a trailing edge, an upwardly extending portion extending from the trailing edge of the sill base, and an upwardly extending lip structure extending from the sill base, wherein the upwardly extending lip structure is laterally spaced from the upwardly extending portion, wherein the upwardly extending lip structure, the upwardly extending lip structure and an interconnecting portion of the sill base form an elongated channel;
• an elongated rail assembly extending at least a portion of the length of the elongated sill assembly, wherein a portion of the elongated rail assembly is received within the elongated channel, a leading portion of the elongated rail assembly engages the upwardly extending lip structure, and a trailing portion of the elongated rail assembly contacts a free end of the upwardly extending portion, wherein the elongated rail assembly is selectively positioned within the elongated channel;
• and
• at least one sill component connected to one of the elongated rail assembly and the elongated channel, wherein the at least one sill component includes at least one of a cover assembly, an astragal bolt receiver assembly, a mullion boot assembly, and a side panel spacer assembly.

An adjustable threshold and door sill assembly, comprising:

• an elongated sill assembly having a length, wherein the elongated sill assembly includes at least one elongated channel extending substantially the length of the elongated sill assembly, wherein the elongated sill assembly includes an upwardly extending lip structure positioned adjacent one of the at least one elongated channel;
• an elongated rail assembly extending at least a portion of the length of the elongated sill assembly, wherein a portion of the elongated rail assembly is received within the at least one elongated channel, wherein the elongated rail assembly includes a leading portion of the elongated rail assembly that engages the upwardly extending lip structure;
• and
• at least one spacer component for uniformly adjusting the vertical position of the elongated rail assembly with respect to the elongated sill assembly along the length of the elongated rail assembly, wherein each of the at least one spacer component is sized to be received in one of the at least one elongated channel and extend the length of the one channel, wherein each of the at least one spacer component has an installed position whereby the spacer component is positioned within the one elongated channel below a lower portion of the elongated rail assembly for supporting the elongated rail assembly in the vertical position.