Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D225-07 – Standard Test Method Technical Guide
The ASTM D225-07 specification covers asphalt shingles made from organic felt, surfaced with mineral granules. It provides requirements for classification, materials, manufacturing, and physical properties to ensure reliable performance in steep roofing applications.
📐 Classification and Styles
Shingles are classified as Type I or Type III, both of which may have uniform or nonuniform thickness and come in any style as agreed upon by manufacturer and purchaser. The weather-exposed portion is the part visible after application, excluding cutouts. Minimum headlap of 51 mm (2 in.) is required for all shingles.
| 🟦 Type | 📏 Thickness | 🎯 Style | 📐 Headlap |
|---|---|---|---|
| Type I | Uniform or nonuniform | Any | ≥51 mm |
| Type III | Uniform or nonuniform | Any | ≥51 mm |
⚙️ Material and Manufacturing Requirements
In manufacture, dry organic felt is impregnated with hot asphaltic saturant, coated on both sides with hot asphaltic coating, and surfaced with mineral granules on the weather side. The reverse side receives an anti-stick treatment. The felt must be uniform and free from lumps.
The asphaltic coating may include a fine mineral stabilizer insoluble in water to improve durability and performance.
📊 Physical Properties and Performance
Shingles must withstand handling without cracking above 10°C and must not be sticky below 60°C. They must meet physical requirements such as loss on heating, wind resistance, granule adhesion, and fire resistance as per the standard’s tables.
| 🟦 Property | 📏 Requirement | ⚡ Test Method |
|---|---|---|
| Handling Condition | No crack >10°C, no stick <60°C | Visual inspection |
| Loss on Heating | Per Table 2 | ASTM D228 |
| Wind Resistance | Per Table 2 | ASTM D3161 |
| Granule Adhesion | Per Table 2 | ASTM D4977 |
| Fire Resistance | Per Table 2 | ASTM E108 |
Always apply shingles with a headlap of at least 51 mm to maintain weatherproofing as specified in the scope of D225-07.
❓ Frequently Asked Questions
🔍 What is the minimum headlap required for asphalt shingles under D225-07?
The standard requires a headlap of not less than 51 mm (2 in.) for all shingles meeting this specification.
💡 How should shingles be handled during application in cold weather?
Shingles must not crack at ambient temperatures above 10°C and should not be sticky below 60°C to ensure safe handling and application.
⚡ What are the standard test methods for wind resistance of these shingles?
Wind resistance is tested using ASTM D3161, the fan-induced method for asphalt shingles.
📌 What classifications apply to shingles in this specification?
Shingles are classified as Type I or Type III, both available in uniform or nonuniform thickness and any style.