Although it will also be relevant for residential buildings, the content in this section on low slope roofing is focused mainly on commercial and industrial buildings on which these roof systems are more common.

At times when no documentation for the current roof system is available and no manufacturer's mark is visible on the membrane or flashing, you may not be able to positively identify the roof system. Unless you are experienced enough to feel confident in making a positive identification visually, your report should state the limitations of your roof inspection.

Faced with this situation, you would disclaim any deficiencies, the identification of which would require positive identification of the system manufacturer. You would then proceed to identify any obvious or generic deficiencies. As an alternative, or in addition, you can recommend evaluation of the roof system by a qualified contractor.