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Recommended Selection and Usage Guide
for Standard Steel Doors

SDI 108-10

Purpose

To establish guide criteria for the selection and usage of 1-3⁄4" and 1-3⁄8" standard steel doors.

Selection

Standard steel doors are classified in four levels:Level 1 – 1-3⁄4" and 1-3⁄8" standard duty, Level 2 – 1-3⁄4" heavy duty, Level 3 – 1-3⁄4" extra heavy duty and Level 4 – 1-3⁄4" maximum duty.

Each of the four levels noted above offer a range of construction models and designs to meet architectural
requirements for preference and appearance. The standard steel door construction models are full flush, seamless and, stile and rail.

Recommended minimum gauge requirements for the various levels and models of standard steel doors are indicated in table 1.

Usage

Selection of standard steel doors for general usage is made by analyzing criteria such as frequency of use, including subjection to and degree of possible abuse. Other criteria to be considered in door selection are: conformance to local building codes and fire code regulations; sound attenuation and/or insulation requirements; and architectural design and appearance.

Table 2 is a reference aid matching standard duty, heavy duty, extra heavy duty and maximum duty doors with general usage requirements within the classification of buildings. Where optional door levels and models are indicated, further analysis on an individual job basis is recommended.

When unusual or special door usage conditions are encountered, contact a representative member of the Steel Door Institute for consultation and guidance.

Table 1 – Standard steel door grades and models

Level
Model
Full Flush or Seamless
Construction
MSG No.
IP in
SI mm
1
Standard Duty
1
20
0.032
0.8
Full Flush
2
Seamless
2
Heavy Duty
1
18
0.042
1
Full Flush
2
Seamless
3
Extra Heavy Duty
1
16
0.053
1.3
Full Flush
2
Seamless
3
*Stile & Rail
4
Maximum Duty
1
14
0.067
1.6
Full Flush
2
Seamless

*Stiles and rails are 16 gauge; flush panels, when specified, are 18 gauge.

For complete standard steel door construction specifications and available sizes, refer to ANSI/SDI A250.8-2003 (R2008) (SDI-100), Recommended Specifications for Standard Steel Doors and Frames and ANSI/SDI A250.4- 2001 Test Procedure and Acceptance Criteria for Physical Endurance for Steel Doors, Frames, Frame Anchors and Hardware Reinforcings.

Table 2 – Suggested door levels and applications

Note:Table 2 is only a guide. Please consult ANSI A250.8 (SDI-100) and applicable building codes for additional requirements. For additional designs refer to ANSI/SDI A250.7, “Nomenclature for Standard Steel Doors and Frames.”

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Steel Door Institute Standard Steel Door Design Nomenclature