For commercial and residential exterior applications with indirect exposure to the weather. CertainTeed Exterior Soffit Type X and CertainTeed Exterior Soffit Type C Gypsum Boards are used for the underside of eaves, carport ceilings, canopies and other commercial and residential exterior applications with indirect exposure to the weather. CertainTeed Soffit Type X and Type C Board have a specially formulated core for use in fire resistance-rated designs. Both types consist of a solid set gypsum core covered with durable water resistant backing paper and are available in a variety of lengths.

Technical Information

Exterior Soffit Boards consist of a solid set gypsum core covered with durable water-resistant backing paper.

Product Data:

  • Thickness: 5/8" (15.9mm)
  • Length: 8' (2440mm)
  • Width: 4' (1220mm)
  • Edges: Tapered
  • Paper: 100% recycled durable water-resistant backing paper
  • Applicable Standard: Meets ASTM C1396 

For complete product description and detailed Technical Data, please see the Product Data and Submittal Sheet.

Installation

CertainTeed Regular Gypsum Board accepts most types of paints, textures and wall covering materials. The surface shall be primed and sealed with a full-bodied latex primer before applying a final decorative material. This will equalize the suction between the joint compounds and the paper surface. For best painting results, all surfaces, including joint compound, should be clean, dust-free and not glossy. If glossy paints are used, a thin skim coat of compound over the entire surface, Level 5 finish, is recommended to reduce highlighting or joint photographing. This method is also recommended for areas of critical sidelighting of natural or artificial light sources. A sealer application under wallpaper or other wall coverings is also recommended so the board surface will not be damaged if the covering is subsequently removed during redecorating. Joint treatment must be thoroughly dry before proceeding with primer-sealer application and final decoration. Please refer to the Gypsum Association's GA-600 Fire Resistance Design Manual or to the UL Fire Resistance Directory for important specific fire safety information. For complete installation instructions please see Install Like the Pros, Gypsum Board Installation Guide.

Warranty Details

Please see the attached document for complete warranty details.

Sustainability Information

CertainTeed takes pride in providing the best solutions to make the spaces where we work, live, and play healthier and safer. This means offering high-performing products that create better living environments.

Our products improve building energy efficiency and reduce building energy consumption for the life of the structure. As a result, they help conserve non-renewable energy sources, decrease dependence on hydrocarbons, and lower greenhouse gas emissions.

CertainTeed’s ongoing commitment to sustainability in our manufacturing operations incorporates the principles of industrial ecology, managing energy and water, and reducing waste.

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