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D3747-79 – Standard Test Method Technical Guide
📐 Scope and Classification
This specification covers emulsified asphalt adhesive for adhering preformed roof insulation to steel roof decks with inclines up to 33%. When applied as a continuous film, it functions as both an adhesive and a vapor retarder.
The adhesive is classified into Type I for use at temperatures above 4°C (40°F) and Type II for use at temperatures above -7°C (20°F). These types ensure suitable performance under varying application conditions.
⚙️ Physical Requirements and Application
The emulsion must be homogeneous with no water separation or coagulation. It shall be manageable by hand stirring at temperatures above 10°C (50°F). The consistency must permit application at a rate of 0.8 to 1.0 L/m² (2 to 2½ gal/100 ft²) using a brush, long-napped roller, or spray. For a continuous film, spray application is recommended to achieve uniform coverage.
| 🟦 Type | 📏 Min. Application Temperature | 📐 Application Rate (L/m²) | 🎯 Application Rate (gal/100 ft²) |
|---|---|---|---|
| Type I | Above 4°C (40°F) | 0.8 to 1.0 | 2 to 2½ |
| Type II | Above -7°C (20°F) | 0.8 to 1.0 | 2 to 2½ |
💡 Tip: When applying a continuous film, spray application is recommended to ensure even distribution and optimize both adhesive bonding and vapor retarder effectiveness.
🧪 Test Methods and Key Properties
Sampling and testing shall be conducted in accordance with Test Methods D2939. Water vapor permeance is determined per Test Methods E96/E96M, Procedure E. Specimens are prepared by casting the emulsified asphalt at the specified rate onto silicon-treated aluminum foil, then dried at room temperature for 24 hours. Talc may be dusted on the specimen to facilitate handling.
Adhesive strength is evaluated using a ring stand and specified apparatus to verify adequate cured performance, as outlined in the standard.
| 📐 Test Parameter | ⚡ Specification |
|---|---|
| Specimen Preparation Rate | 0.8 to 1.0 L/m² (2 to 2½ gal/100 ft²) |
| Drying Conditions | Room temperature for 24 hours |
| Test Procedure | E96/E96M, Procedure E |
| Handling Aid | Dust with talc if necessary |
⚠️ Safety Note: This standard does not purport to address all safety concerns. Users are responsible for establishing appropriate safety and health practices and determining the applicability of regulatory limitations prior to use.
❓ Frequently Asked Questions
🔍 What are the temperature limits for each type?
Type I is suitable for use above 4°C (40°F), while Type II is suitable for use above -7°C (20°F). Select the type according to the ambient temperature during application.
💡 Can this adhesive be used on inclines greater than 33%?
No, the standard specifies application on steel roof decks with inclines only up to 33%. For steeper inclines, alternative adhesives or methods are required.
📌 How should the emulsion be handled if separation occurs?
The emulsion must be homogeneous; any separation should be correctable by hand stirring at temperatures above 10°C (50°F). Ensure it is free of coagulation or packing before use.
⚡ What is the recommended application method for continuous film?
Spray application is recommended for continuous film to ensure uniform coverage and maximize both adhesion and vapor retarder performance.