Republic Doors and Frames (http://republicdoor.com)

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Thermal Performance / STC Core Ratings

These results are based off two different thermal tests, ASTM C518 (calculated) and ASTM C1363 (operable); and 2 different STC tests, ASTM E90 and ASTM E413

  • "U" Factors: The lower the value the better the rating.
  • "R" Factors: The higher the value the better the rating.
  • STC Values: The values represent core standards only.
Republic Standard Hollow Metal Doors
Description Sound Transmission Class (ASTM E90, ASTM E415) "U" Factor Calculated (ASTM C518) "R" Factor Calculated (ASTM C518) "U" Factor Operable (ASTM C1363) "R" Factor Operable (ASTM C1363)
Flush with Honeycomb Core 38 0.34 2.94 0.59 1.70
Flush with Polystyrene Core 35 0.13 7.61 0.41 2.43
Flush with Polyurethane Core 33 0.10 10.11 0.39 2.56
Flush with Gypsum Fiberboard Core 38 0.26 3.85 0.56 1.80
Flush with Steel Stiffened Core n/a 0.15 6.80 0.61 1.65
Embossed with Styrene Core 30 n/a n/a 0.46 2.18

Thermal Performance Positioning

ASTM C518 tested central portion of door panel while ASTM C1363 tests entire operable door assembly

Universal Rough Opening Calculator

Instructions: Use decimal inches, face dimensions, and nominal opening size for butted application
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Drywall Rough Opening Calculator

Instructions: Use decimal inches and results are for standard 2 inch face
Width must be number (ex. 99 or 99.99)
Height must be number (ex. 99 or 99.99)
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