DensGlass Sheathing Guide: The Gold Standard in Exterior Wall Protection
Explore DensGlass Sheathing, the industry-defining fiberglass mat gypsum board from Georgia-Pacific, trusted for over 30 years in exterior wall applications worldwide. Known for its iconic golden finish, DensGlass Sheathing delivers unmatched moisture resistance, fire safety, and durability—making it the preferred choice for architects, builders, and contractors in 2025. This guide dives into its features, specs, benefits, and installation tips to showcase why DensGlass remains a global leader.
What is DensGlass Sheathing?
DensGlass Sheathing is a premium gypsum panel with fiberglass mats on both faces and a moisture-resistant core, designed as a superior substrate for exterior cladding systems. Introduced over three decades ago as a pioneer in its category, it’s engineered for steel or wood framing and offers exceptional performance under harsh conditions. Backed by a 12-month limited warranty against delamination or deterioration, DensGlass is the gold standard for exterior sheathing.
Key Features:
- Mold Resistance: Scores a perfect 10 on ASTM D3273 tests, outpacing paper-faced boards.
- Fire Protection: Non-combustible (ASTM E136) with a Class A rating.
- Durability: Resists warping, cracking, and weather-related wear.
- Versatility: Ideal for brick, siding, stucco, and EIFS applications.
DensGlass Sheathing Specifications
| Feature | Details |
|---|---|
| Thickness | ½ in. (12.7 mm), ⅝ in. (15.9 mm) |
| Standard Sizes | 4 ft x 8 ft, 4 ft x 12 ft |
| Weight | 1.9 lb/ft² (½ in.), 2.4 lb/ft² (⅝ in.) |
| R-Value | 0.56 (½ in.), 0.67 (⅝ in.) |
| Fire Rating | Class A, Non-combustible |
| Mold Resistance | Score of 10 (ASTM D3273) |
| Exposure Warranty | Up to 12 months |
Custom lengths available through Georgia-Pacific distributors.
Why Choose DensGlass Sheathing?
1. Superior Moisture Resistance
The fiberglass mat design eliminates paper facings, preventing mold growth and water damage. DensGlass excels in wet climates, earning its top mold resistance rating (ASTM D3273).
2. Exceptional Fire Safety
With a flame spread of 0 and minimal smoke development (ASTM E84), DensGlass enhances building safety without compromising structural integrity.
3. Contractor-Friendly Handling
Lightweight and easy to cut, DensGlass snaps cleanly with a utility knife, streamlining installation and reducing labor costs.
4. Ideal Cladding Base
From traditional brick to modern exterior insulation systems, DensGlass provides a stable, reliable substrate compatible with air and water-resistive barriers.
Applications
DensGlass Sheathing shines in a variety of construction settings:
- Residential: Exterior walls, soffits, and foundations.
- Commercial: High-rise buildings, retail spaces, and offices.
- Institutional: Schools, hospitals, and government facilities.
Its proven track record makes it a staple in architectural specifications globally.
How to Install DensGlass Sheathing
- Prepare the Frame: Confirm wood or steel framing is plumb and spaced per code (16″ or 24″ O.C.).
- Cut Panels: Score with a utility knife and snap, or use a saw for precision.
- Fasten Securely: Use corrosion-resistant screws or nails, spaced 6″ along edges and 12″ in the field.
- Seal Joints: Apply compatible flashing tape to seams and penetrations for weather protection.
Performance Highlights
- Mold Resistance: Lab-tested to resist mold for 4 weeks (ASTM D3273), with real-world performance dependent on site conditions.
- Weather Durability: Withstands up to 12 months of exposure without degradation.
- Fire Standards: Meets stringent codes like ASTM E136 and BS EN 13501-1 (A1 rating).
Frequently Asked Questions (FAQs)
What sets DensGlass apart from traditional gypsum boards?
Its fiberglass mats replace paper facings, offering superior moisture and mold resistance unmatched by conventional sheathing.
Can DensGlass handle extreme weather?
Yes, its 12-month exposure warranty and robust design make it perfect for rainy, humid, or coastal regions.
Is DensGlass available internationally?
Absolutely—Georgia-Pacific ensures global availability with localized support for contractors worldwide.
Why DensGlass Sheathing Reigns Supreme in 2025
With over 30 years of innovation, DensGlass Sheathing from Georgia-Pacific combines field-tested reliability with cutting-edge performance. Its golden fiberglass mats signal quality that architects and builders trust for projects of all scales. Choose DensGlass for a sheathing solution that stands the test of time.