Your foundation sets the stage for your entire home—and you only get one chance to get it right. In this module, you’ll learn how to build a dry, durable, and mold-resistant foundation that will last the life of the house. You’ll explore how grading, drainage, waterproofing, and proper vapor barriers protect your structure from water intrusion and radon. You’ll learn the pros and cons of different foundation types (slab, crawl space, basement, stilts), insulation strategies, and how to detail subfloors for both strength and indoor air quality. You'll learn the difference between building a vented or conditioned basement or crawlspace. Whether you're building on a slab or digging a basement, this module provides the blueprint for a healthy foundation system that won’t let you down.