ASTM E1993/E1993M

ASTM E1993/E1993M is the ASTM standard for bituminous water vapor retarders used in contact with soil or granular fill under concrete slabs. It provides a technical basis for specifying a retarder material intended to help limit moisture migration beneath slab-on-grade construction. For designers, contractors, and purchasers, this standard matters because it supports clearer product selection, more consistent quality expectations, and better alignment between material performance and project requirements.

Overview of ASTM E1993/E1993M

The official title of ASTM E1993/E1993M points to a specification for bituminous water vapor retarders placed against soil or granular fill beneath concrete slabs. In practical terms, it helps define the material requirements and performance expectations for a product used in slab construction where moisture control is important. As an ASTM standard, it serves as a reference for procurement, verification, and quality control when evaluating retarder materials for this application.

Common use cases of ASTM E1993/E1993M

This standard is commonly used in projects involving concrete slabs laid over soil or granular fill, such as slab-on-grade floors and similar ground-supported assemblies. ASTM E1993/E1993M may be referenced when specifying bituminous water vapor retarders for new construction, material submittals, or acceptance checks. It is especially useful when moisture management under the slab is part of the design intent and the project team needs a clear specification basis for the retarder product.

Benefits of using ASTM E1993/E1993M

Using ASTM E1993/E1993M helps bring consistency to product evaluation and specification writing for under-slab vapor retarder materials. It can support more reliable procurement by giving buyers and suppliers a common technical reference. The standard also helps reduce ambiguity during quality control and compliance review, since it ties the material to a recognized ASTM specification. For projects where moisture control under concrete slabs is important, that clarity can help lower risk and improve coordination.

• Bituminous water vapor retarder specification
• For use under concrete slabs
• Intended for contact with soil or granular fill
• Supports material selection and compliance checks