The need to properly assess the condition of the roof system is critical from an environmental and monetary point of view. The visual and physical inspection of the roof is the first step in deciding whether to repair, replace or recover the system. This information is required to properly budget and manage resources. Additionally, it would help the environment by reducing the amount of material sent to landfills. Every country has its own standards and all practitioners have their own approach to the assessment. This report attempts to provide a guideline for the assessment of low-slope roof systems. A flowchart for the assessment is presented. Use of this flowchart to carry out inspections should help minimize incorrect actions such as needlessly replacing roofs. Moreover, different test methods and standards are offered from various countries. This report is geared towards individuals who are involved in the roofing industry and who have a general understanding of condition assessment. The flowchart, standards, and test procedures mentioned in this document are presented as a resource for reference purposes. All decisions as to the use of the flowchart, test methods and interpretation of any data are to be based on professional knowledge and expertise.