Final answer:
OBS sheets that are less than 24 inches in width are typically installed near the ridge of the roof for adequate support and fastening.
Step-by-step explanation:
The question appears to be related to the rules and guidelines for installing Observation (OBS) units or materials on a roof in construction or engineering. In usual construction practices, if an OBS sheet gets ripped or cut to a width less than 24 inches, it should be installed near the ridge of the roof.
The reasoning behind this placement is related to structural support and the ability to provide sufficient fastening, as smaller pieces may not provide adequate coverage or may not be able to be securely fastened if located elsewhere on the roof structure. Always consult the latest building codes and manufacturer's specifications for the materials used when unsure of installation requirements.