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D6221 – Standard Test Method Technical Guide
📐 Scope and Classification
ASTM D6221/D6221M details factory-prepared reinforced bituminous flashing sheets for roofing and waterproofing. These sheets utilize bitumen (asphalt, coal-tar pitch, or polymer-modified) reinforced with organic, polyester, or glass fiber felts, woven fabrics, or thermoplastic films. Surfacing includes mineral powders, granules, or metal foils.
| 🟦 Property | 📐 Type 1 (Heavy / Thick) | 📏 Type 2 (Lightweight / Thin) |
|---|---|---|
| Classification | Heavy, thick flashing sheets | Lightweight, thin flashing sheets |
| Permitted Bitumen | Asphalt, coal-tar pitch, or polymer-modified | Asphalt, coal-tar pitch, or polymer-modified |
| Reinforcement | Organic, polyester, or glass fiber felts/fabrics | Organic, polyester, or glass fiber felts/fabrics |
| Surfacing | Mineral powders, granules, or metal foils | Mineral powders, granules, or metal foils |
⚙️ Physical Properties and Verification
Section 6 requires that all materials conform to the specific criteria in Table 1 of the standard. Compliance is verified using the following referenced test methods:
| 🎯 Test Method | ⚡ Property Evaluated | 📌 Standard Context |
|---|---|---|
| D228/D228M | Sampling and Analysis | Asphalt roll roofing components |
| D751 | Coated Fabric Strength | Fabric-reinforced sheet tensile/elongation |
D3746/D3746
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