ASTM C1764-20 PDF Download

The ASTM C1764-20 standard provides guidelines for evaluating the performance of non metallic plaster bases when used with Portland cement based plaster in vertical wall applications.

The standard includes several test methods to assess the performance of the plaster bases under different conditions and exposures. These test methods are not necessarily applicable to all projects, as the specific test conditions and exposures may vary depending on the project requirements.

Some of the test methods covered in the standard include:

4.2 Transverse Load: This test method evaluates the ultimate wind load resistance of the wall assembly, considering the influence of framing, sheathing, and means of attachment.

4.3 Vertical Load: This test method determines the ultimate vertical load capacity of the cladding assembly, taking into account the weight and attachment mechanism of the Portland cement based plaster.

4.4 Embedment: This test method assesses the effectiveness of the plaster bases in serving as a key, reinforcement, and attachment mechanism for the plaster. It ensures that the plaster bases are adequately embedded in the Portland cement based plaster.

4.5 Fastener Pull Through Resistance: This test method evaluates the effectiveness of the fastener attachment used to secure the non metallic lath to the building frame or substrate.

Additionally, the standard includes a test method for alkali resistance, applicable only to glass fiber materials.