Page 1 of 1

ASTM D1970 can be used to demonstrate

Posted: Thu Jul 10, 2025 6:35 am
by akterchumma699
The test method included in this standard applies a membrane to horizontally-oriented plywood with two nails penetrating the membrane and plywood (Figure 3). The nails are backed out 6.3 mm (¼-in.) and a 127-mm (5-in.) head of water is applied for three days. The results are classified as pass or fail and based on the observation of visible leakage. However, what do these test results mean? Can the user assume the results are similar with alternate substrates or other variables?

The industry is not yet consistent on terminology related to the performance rcs data of fastener penetrations through materials. Design and construction professionals should be aware of the significance and intent of the different terms. As discussed,

a material’s self-sealability around a nail. However, other terms such as “self-healing” and “self-gasketing” are also used interchangeably, when in fact, they have very different meanings. When it comes to defining self-sealing, certain manufacturers indicate the material properties can provide a seal around the shaft of the fastener. However, a fastener applied perpendicularly typically has a greater likelihood to pass the test than a fastener installed on an angle to the substrate.

The probability of a perfectly installed fastener perpendicular to the substrate being replicated consistently and reliably in the field is challenging. Without an awareness of such limitations, users might assume a laboratory “pass” yields similar field performance.