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GridMarX Gypsum Board
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Gold Bond® SoundBreak XP Retrofit™ Board


Gold Bond® BRAND SoundBreak XP Retrofit Board consists of a high-density mold-, mildew- and moisture-resistant gypsum board with specially designed PURPLE® paper on the front and a sound damping, viscoelastic polymer adhered to the back paper.  This acoustically enhanced, fire-resistnace gypsum board is encased in heavy paper that is 100-percent recycled on both sides and offers superior abrasion, mold-, mildew- and moisture-resistance.

Use SoundBreak XP Retrofit on one side of a gypsum board wall to improve the acoustical performance by creating a constrained damping layer when laminated over the existing surface.

For speed of installation, GridMarX® guide marks are printed on the paper surface.

Basic Uses

  • Use SoundBreak XP Retrofit to improve the acoustical performance of an existing wall assembly, and to achieve a higher Sound Transmission Class (STC) rating for existing interior gypsum board walls where sound transmission has become a concern.
  • Laminated 5/16 in. (7.9 mm) thick SoundBreak XP Retrofit over existing interior gypsum board walls in residential, multifamily and commercial applications for additional sound damping between rooms or dwelling units.


  • When installing over an existing interior wall assembly, SoundBreak XP Retrofit enhances Sound Transmission Class (STC) values per an independent third-party acoustical laboratory using ASTM E90 test procedures.
  • Achieves increased STC values in a thinner wall assembly, increasing usable floor space.
  • Superior sound damping, cost-efficient material that finishes easily and decorates in the same manner as standard gypsum board.
  • For speed of installation and lower installation costs, vertical board joints do not require acoustical sealant.
  • Heavy abrasion-resistant paper and dense core provide greater resistance to surface abuse when tested in accordance with ASTM C1629.
  • Resists the growth of mold per ASTM D3273 with a score of 10, the best possible score.
  • Resists the growth of mold per ASTM G21 with a score of 0, the best possible score.
  • Fire-resistant material with a gypsum core will not support combustion or transmit temperatures greatly in excess of 212°F (100°C) until completely calcined, a slow process.
  • Easily scored and snapped to exact size without sawing.
  • Dimensionally stable product with negligible expansion and contraction under normal atmospheric conditions.
  • Features GridMarX® guide marks on the board to allow for faster and more accurate installation.
  • Achieves GREENGUARD and GREENGUARD Gold Certification. GREENGUARD Certified products are certified to GREENGUARD standards for low chemical emissions into indoor air during product usage. For more information, visit:
  • Qualifies as a low-VOC emitting material by meeting California Specification 01350. For more information, visit:


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Technical Data
Literature   PDF
PostCards   PDF  PDF
SDS   PDF  PDF (espaƱol)
Submittal   PDF
Checked items above will be available for email and download on the Submittal Builder page.