Stucco sheathing forms the foundational backing material of stucco layers in both residential and commercial buildings. Various materials such as wood, cement, gypsum, and fiberglass are used for sheathing. This article aims to provide a comprehensive understanding of these materials, their properties, and applications.
Wood Sheathing
The most prevalent form of sheathing in residential projects, wood sheathing, comes mainly in two variants: OSB and Plywood.
OSB (Orientated Strand Board)
- Description: OSB is a manufactured product consisting of wood flakes bound by adhesives and compressed in layers.
- Properties: It is relatively inexpensive and widely used in both residential and commercial buildings for wooden sheathing needs.
- Specifications: Typically, OSB sheathing is about 3/8″ to 5/8″ thick, suitable for most stucco applications, depending on building plans or local regulations.
- Availability: Commonly available at large home improvement stores in 4′ x 8′ sheets.
- Additional Resources: Wikipedia, HowStuffWorks.com
Plywood
- Description: Composed of thin layers of plywood glued together, plywood is known for its strength and water resistance.
- Specifications: Similar to OSB in terms of thickness and size for stucco applications.
- Cost: Slightly more expensive than OSB but offers better water resistance and strength.
- Helpful Links: Wikipedia, HowStuffWorks.com
- Properties: Gypsum sheathing is typically 1/2″ to 5/8″ thick and available in various lengths.
- Usage: More specialized and not as readily available as wood sheathing, it is used for its faster installation process, especially in commercial projects.
- Manufacturers: Georgia Pacific (Densglass), National Gypsum, CertainTeed, American Gypsum.
- Related Links: ASTM.org, Gypsum.org
Glass Mat Sheathing
This variant of exterior gypsum board uses a fiberglass barrier for additional protection.- Specifications: Available in similar sizes to exterior gypsum.
- Cost and Availability: It’s a specialty item found at stucco supply yards or upon order, and is slightly more expensive.
- Manufacturers: Georgia Pacific (Densglass), USG, CertainTeed, National Gypsum.
- Specifications: Available in 1/4″ or 1/2″ thickness and in various sheet sizes.
- Availability and Pricing: Easily found at large home improvement stores and priced reasonably.
- Resources: Wikipedia, About.com
- Manufacturers: Hardie Backer Board, USG, CustomBuildingProducts.com, National Gypsum
