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D6506 – Standard Test Method Technical Guide
The ASTM D6506/D6506M-01 (Reapproved 2024) specification defines requirements for asphalt-based protection boards used to safeguard below-grade waterproofing systems. These boards shield waterproofing membranes from backfill, construction activities, and weathering prior to the application of surfacing or backfilling. The standard is under the jurisdiction of ASTM Committee D08 on Roofing and Waterproofing.
📐 Classification and Material Requirements
Section 3 of the standard defines two classes of protection board. Class A is composed of an asphalt-saturated organic felt bottom layer and a coated or saturated non-woven glass felt top layer. Class B utilizes glass fabrics for both the top and bottom layers. Each class is available in three nominal thicknesses, with the option for one side to be covered with a thin plastic antistick sheet. The material must consist of layers of asphalt and reinforcing mat, with one surface uniformly coated with a bituminous material for limited weather protection, as per Section 4. Length and width tolerances are ±6 mm [±1/4 in.] as specified by the manufacturer.
⚙️ Physical Specifications and Tolerances
Section 6 outlines the physical requirements, including nominal thicknesses such as Type 1 board at 1/16 in. The board surfaces must be uniform and free from defects such as cracks or indentations, and edges must be uniform. Sampling per Section 5 requires one representative sample per 10,000 ft² or fraction thereof, with each sample providing at least five test specimens. Referenced test methods include D545, D5147/D5147M, and E154/E154M.
| 🟦 Parameter | 📏 Specification | 🎯 Tolerance |
|---|---|---|
| Nominal Thickness (Type 1) | 1/16 in. | As per manufacturer |
| Length and Width | As specified by manufacturer | ±6 mm [±1/4 in.] |
| Surface Condition | Uniform, no cracks or indentations | Mandatory |
| Edge Condition | Uniform | Mandatory |
| Sampling Frequency | One per 10,000 ft² | Fraction thereof |
⚠️ Note the ɛ1 editorial correction in November 2024 to Section 7.1 of the standard. Verify compliance with the latest revision for accurate test method references.
💡 For optimal performance, ensure the protection board is fully compatible with the waterproofing system and properly installed to withstand backfill pressures and construction traffic.
❓ Frequently Asked Questions
🔍 What is the primary purpose of an asphalt-based protection board? It protects below-grade waterproofing systems from damage during backfilling, construction, and weathering before the final surface or backfill is applied.
💡 How do Class A and Class B protection boards differ in composition? Class A uses an organic felt bottom with a glass felt top, while Class B uses glass fabrics for both top and bottom layers. Both classes are available in three thicknesses per the standard.
⚡ What dimensional tolerances apply to protection boards? The length and width tolerances are ±6 mm [±1/4 in.] as specified by the manufacturer in Section 4.2 of the standard.
📌 How is sampling performed for compliance testing? One representative sample is required per 10,000 ft² or fraction thereof, providing at least five test specimens for the tests listed in Section 7.