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D2822 – Standard Test Method Technical Guide
🏗️ Classification and Types
This specification covers asbestos-containing asphalt roof cement for trowel application to roofing and flashings. The material is classified into Type I and Type II based on the characteristics of the asphalt base. Type I is made from asphalts that are self-healing, adhesive, and ductile, conforming to Specification D312 Type I, D449 Types I or II, or D946. Type II utilizes asphalts with high softening point and relatively low ductility, conforming to D312 Types II or III, or D449 Type III.
Each type is subdivided into two classes: Class I for application to essentially dry surfaces, and Class II for application to damp, wet, or underwater surfaces. These classifications ensure appropriate selection for specific site conditions.
📊 Composition Requirements
The asphalt roof cement must adhere to strict composition limits as determined by Test Methods D6511. The following table outlines the required proportions:
| 🧪 Property | 📏 Minimum (%) | 📏 Maximum (%) |
|---|---|---|
| Water | — | 1.0 |
| Nonvolatile matter | 70 | — |
| Asbestos and other mineral stabilizers | 15 | 45 |
| Asphalt | 30 | 60 |
The cement consists of an asphalt base, volatile petroleum solvents, and mineral stabilizers including asbestos fiber, mixed to a smooth, uniform consistency for trowel application.
🛠️ Application Considerations
Proper class selection is critical for performance. Class I cements are formulated for dry surfaces, while Class II cements can be applied to damp, wet, or underwater substrates. The standard emphasizes that values in SI or inch-pound units must be used independently to avoid non-conformance.
💡 Tip: Always verify the class of cement required for your project conditions. For underwater applications, exclusively use Class II cement.
⚠️ Warning: This product contains asbestos. Users must follow all safety and health regulations, and assess applicability of regulatory limits prior to use.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D2822?
It specifies asbestos-containing asphalt roof cement for trowel application to roofing and flashings. It covers classification, composition, and performance requirements.
💡 What are the key composition limits?
Water must not exceed 1.0%, nonvolatile matter at least 70%, mineral stabilizers 15%–45%, and asphalt 30%–60%.
⚡ How is the cement classified?
It is classified as Type I (ductile, self-healing) or Type II (high softening point). Each has Class I (dry surfaces) and Class II (damp, wet, or underwater).
📌 What test methods are referenced?
Composition is tested under Test Methods D6511, which includes procedures for water, nonvolatile matter, and stabilizer content.