Gypsum Sheathing

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8.5" x 11"
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Gypsum Sheathing

Use this 3 part SimpleSpecs™ specification template to specify exterior gypsum sheathing with glass fiber facings for use behind masonry, EIFS, siding, and plaster.

Sheathing has a water repellent core and facings and allows temporary exposure to the elements, typically from 3 to 6 months.

A weather barrier is required over the sheathing to prevent moisture infiltration to the interior of the structure.

Older style paper-faced sheathing is not included but may be edited into this section. This type of sheathing is not intended to be left exposed for even short periods and must be covered with a weather barrier.

Installation is covered by ASTM C1280 – Standard Specification for Application of Exterior Gypsum Panel Products for Use as Sheathing.

 

Comparing Gypsum, Wood and Cementitious Sheathing

Gypsum sheathing offers a distinct set of characteristics and benefits when compared to other sheathing materials like wood-based or cementitious sheathing. Here’s how gypsum sheathing stands apart:

1. Material Composition:

  • Gypsum Sheathing: Made from gypsum, a mineral composed of calcium sulfate dihydrate. It is often faced with water-resistant paper or fiberglass mats to enhance its moisture resistance.
  • Wood Sheathing: Typically made from plywood or oriented strand board (OSB), derived from wood.
  • Cementitious Sheathing: Made from a mixture of cement, sand, and sometimes fibers (wood or fiberglass) for reinforcement.

2. Moisture Resistance:

  • Gypsum is designed to be moisture-resistant, making it suitable for use in exterior wall assemblies where exposure to moisture is a concern. Its water-resistant facer and the core’s ability to breathe make it effective at managing moisture.
  • Wood sheathing can absorb moisture if not properly treated or protected, leading to potential issues with mold, rot, or structural integrity.
  • Cementitious sheathing offers excellent moisture resistance due to its cement-based composition but can be more brittle and prone to cracking.

3. Fire Resistance:

  • Gypsum inherently has fire-resistant properties, making gypsum sheathing a good choice for adding fire protection to exterior wall assemblies.
  • Wood sheathing requires additional treatments to achieve fire resistance.
  • Cementitious sheathing also offers good fire resistance due to its inorganic nature.

4. Weight and Installation:

  • Gypsum sheathing is lighter than cementitious sheathing, making it easier to handle and install. However, it can be more fragile and susceptible to damage during handling.
  • Wood sheathing is generally lightweight and easy to cut and install but lacks the inherent moisture and fire resistance of gypsum or cementitious materials.
  • Cementitious sheathing is heavier, which may require more labor for installation but offers durability and resistance to pests.

5. Environmental Considerations:

  • Gypsum sheathing has a smaller environmental impact in terms of production energy compared to cementitious sheathing. It can also be recycled at the end of its life cycle.
  • Wood sheathing comes from a renewable resource, but concerns about deforestation and the treatment chemicals used for enhancing its resistance to elements can impact its environmental footprint.
  • Cementitious sheathing involves energy-intensive production processes, contributing to a higher carbon footprint.

Conclusion

Choosing between gypsum, wood, or cementitious sheathing depends on the specific requirements of a construction project, including considerations for moisture and fire resistance, weight, installation ease, and environmental impact. Gypsum offers a balanced solution with its moisture and fire-resistant properties, making it a preferred choice for many exterior wall applications.

 

Related Industry Association:

Gypsum Association

 

Related SimpleSpecs™ master specifications:

 

gypsum sheating

Industry Resources
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