SECUROCK® Glass-Mat Sheathing

USG Boral SECUROCK® Glass-Mat Sheathing are non-combustible, moisture- and mould-resistant panels for wet areas, backer tile, and semi-exterior applications. The panels have inorganic non-woven glass mat facers that repels water and feature square edges. The front facer glass mat is primed and engineered to accept the application of USG Boral finishing systems. 


Non-combustible, Moisture and Mould-resistant
  • Inorganic non-woven glass mat front and back facers, offering exceptional water and weather resistance.
  • Patented Mold Tough® technology with moisture and mould-resistant gypsum core.
  • A1 Non-combustible according to EN 13501-1+A1:2013 and BS 476 Part 4 1970.
  • Mould-resistant: Scores a 10 (highest) when tested in accordance with ASTM D3273.
Meets Industry Standards
  • Meets or exceeds the requirements of ASTM C1177 (Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing).
  • Meets or exceeds the requirements of ASTM C1178 part 5.2.5 (Standard Specification for Coated Glass Mat Water-Resistant Gypsum Backing Panel).
  • Meets or exceeds the requirements of EN15283-1 (Gypsum boards with fibrous reinforcement - Part 1).
  • Conform to the provisions of the European CPR-Construction Products Regulation and related CE Marking technical requirements.
  • Non-combustible core when tested in accordance to BS 476 Part 4 1970, and Class A1 non-combustible according to EN 13501-1+A1:2013.
Quick Installation
  • Simple score-and-snap, with no sawing or special tools required.
Warranted Performance
  • Exposure: Can be exposed to limited-weather for up to 12 months after installation in interior and exterior applications.
  • USG Boral SECUROCK® Glass-Mat Sheathing is guaranteed for five years against manufacturing defects.
  • Backed by the high-quality standards and outstanding service of USG Boral.
  • 12.7mm (1/2”) SECUROCK® Glass-Mat Sheathing Panel.
  • 15.9mm (5/8”) SECUROCK® Glass-Mat Sheathing Panel.


Application Fields

  • Backer tile walls in public shower, bathroom areas for commercial and residential projects.
  • Non-Tile walls with high moisture and mould requirements.
  • Wet area ceilings.
  • Industrial Kitchens Ceilings.
  • Swimming pool ceilings.
  • Exterior Ceilings.

  • Level 5 can be achieved for paint finishing (walls and ceilings)
  • Supports tiling up to 75 kg/m2 (interior walls)
  • Exceeds requirements for both cementitious and acrylic adhesives per ASTM C297 and BS EN 12004.

Technical Data and Notes

USG Boral SECUROCK® Glass-Mat Sheathing

Please refer to USG Boral representative for other board sizes.

Physical Properties (According to ASTM C1177 and EN 15283-1)

1/2" (12.7mm) USG Boral Securock™ Glass-Mat Sheathing (Interior and Semi-Exterior)

5/8" (15.9mm) USG Boral Securock™ Glass-Mat Sheathing Type F and Firecode™ X (Could be used for exterior walls)

 Thickness, in. (mm)
 1/2" (12.7mm)  5/8" (15.9mm)
 Width and Lengths, mm. (ft)
 1220mm x 2440mm
1200mm x 2400mm
 1220mm x 2440mm
1200mm x 2400mm
Weight, nominal (kg/m2)
11.0 ± 0.5 13.6 ± 0.6
Flexural strength, parallel, lbf. (N)
>80 (356) >140 (445)
Flexural strength, perpendicular, lbf. (N)
>140 (445) >140 (623)
*R-Value – Thermal resistance (m2.K/W)
0.05 0.06
Reaction to Fire (A1 – EN-13501-1)
Non-combustible Non-combustible
  Resistance to growth of mold - ASTM D3273 score
10/10 10/10
Water absorption (% of weight) - EN 15283-1
 < 5 %  < 5 %

Glass-Mat Systems

Interior wall tiling (Direct water exposure)

Interior wall tiling (Non-Direct water exposure)

Non - Tile Wall

Interior Ceiling Systems - Wet Area

Interior Ceiling Systems - Harsh Environment

Exterior Ceiling Systems – Small Area (Typically < 3 meters span)

Exterior Ceiling Systems – Big Area (Typically > 3 meters span)

Exterior Metal Cladding System

USG Boral Glass-Mat Absorption Test

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