Jake walks through the practical calculation of "L over 360," a critical structural guideline for installing tile over floor joists. He explains that this standard limits how much a floor joist can bend (or deflect) over a given span to prevent tile cracking. For example, a 10-foot span can deflect no more than 5/16 of an inch for tile installation. Jake also covers the more stringent L/720 standard for natural stone, which requires stronger framing or closer joist spacing due to its brittleness. He demonstrates how these calculations help ensure safe, code-compliant installations, particularly in remodeling scenarios, without needing to reference complex code books. Understanding this math empowers builders to assess whether a floor is suitable for tile or natural stone, ensuring longevity and safety.