Revision of D6694/D6694M-15(2023) Standard Specification for Liquid-Applied Silicone Coating Used in Spray Polyurethane Foam Roofing Systems
Rationale
Ballot Rationale:
The current test method description for Permeance is incomplete, it states:
“6.4 Permeance Method (Test method E96/E96M, Procedure B) – A 0.5 mm [20 mils] +/- 10% film shall be used.
6.4.1 Test condition: 23 +/- 2 C {73.4 +/- 3.6 F].
6.4.2 The test is run in the inverted position with water on contact with the film.
6.4.3 Value is reported in inch-pound and SI units.”
Test Method E96 offers this option:
X1.1.3 Procedure BW – Inverted Water Method at 73.4°F [23°C] and 50% RH.
Adding the “BW” reference supplied proper %RH, and cup geometry.
The BW method does not describe the contact of liquid water to the roof coating applicable in this case.
Work Item Status
Date Initiated: 09-06-2025
Technical Contact: Steve Heinje