# Roof Determination Roofs can be created using various methods. A classical and in most cases very effective method is roof determination. In roof determination, a building outline is entered. Each line of the building outline is assigned the so‑called roof attributes. With this information, the program can determine a roof surface for each side of the building, which will also intersect with the others during this determination. Only by considering all roof surfaces together can certain roof surface geometries be identified. If multiple building outlines with their own roof surfaces are entered, they will automatically intersect with each other depending on the specified intersection priority. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.dietrichs.com/dietrichs-intelligent-documentation/docs-de-en/design-program/modellbereiche/dach/dachausmittlung.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.