The UL Fire Resistance Directory 2017 wasn't just a catalog; it was a bridge between the era of paper-heavy specifications and the modern era of instantaneous, cloud-based code verification.
The 2017 directory reflected the evolution of building codes. With the widespread adoption of the around that time, the 2017 directory was the primary reference used to verify that assemblies met the new requirements for fire-resistance ratings and sound transmission (STC) ratings.