DASMA TDS 154 - DASMA Metal Gauge Chart for Garage Door Steel

Garage door specs list steel thickness in gauge numbers, but higher gauge means thinner steel, which is the opposite of what most buyers expect. DASMA TDS 154 provides the authoritative conversion chart so that a "24 gauge" claim from one manufacturer means the same thing when compared to a "25 gauge" spec from another.

What this data sheet says

TDS 154 lists the standard gauge values used for garage door steel skins and components, along with the equivalent thickness in decimal inches. The Manufacturers Standard Gauge (MSG) system governs steel sheet products in the North American door industry.

"The DASMA Metal Gauge Chart provides a standardized reference for steel thicknesses used in garage door construction."

Key values from the chart:

• 24 gauge equals approximately 0.0239 inches thick.
• 25 gauge equals approximately 0.0209 inches thick.
• 26 gauge equals approximately 0.0179 inches thick.
• 27 gauge equals approximately 0.0164 inches thick.
• 28 gauge equals approximately 0.0149 inches thick.

The difference between 24 and 25 gauge is about 0.003 inches. That is small in absolute terms but represents roughly 14% more steel per unit area, which translates to measurably higher dent resistance and rigidity.

When it applies

The gauge chart matters whenever you are comparing door specifications or evaluating a quote:

• Buying a new door: a builder-grade door is often 27 or 28 gauge. A mid-range residential door is typically 25 or 26 gauge. A premium door is usually 24 gauge. Knowing the actual decimal thickness lets you compare across product lines.
• Matching a panel for repair: if a panel is dented and you want to replace one section, the replacement section must match the existing gauge so the sections seal and align correctly.
• Commercial specifications: design professionals writing door specifications for commercial projects need to cite exact thickness values. TDS 154 provides the DASMA-standard reference values.

In Colorado, where hail is a common hazard, gauge thickness directly affects dent resistance. A 24-gauge skin will survive a medium-sized hailstone that dents a 26-gauge skin.

What this means for you

Do not compare doors by gauge number alone without checking the decimal thickness. Some manufacturers use non-standard gauge definitions or round their gauge claims. Ask for the nominal thickness in decimal inches and compare that number directly.

Thicker is better for dent resistance, but heavier doors need stronger springs. Moving from 26 gauge to 24 gauge can add 10 to 20 lbs to a typical two-car door. If you upgrade the steel gauge, confirm that the spring system is recalculated for the new weight.

Double-skin doors have two steel layers. The gauge spec usually refers to the outer skin. Ask for both inner and outer skin thickness if you want the full picture on a double-skin insulated door.

G Brothers can confirm the gauge specs on any door model we carry and help you choose the right steel weight for your location and budget.

Full text and source

Download DASMA TDS 154 from the official TDS index at https://www.dasma.com/technical-data-sheets/.

This entry applies to cold-rolled steel garage door panels. Aluminum, wood, and fiberglass doors use different thickness standards not covered by TDS 154.