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Know Your House: What Makes Up a Home's Foundation Learn the components of a common foundation and their purpose to ensure a strong and stable house for years to come. The three structural parts of this kind of foundation: A continuous concrete footing A foundation wall of either poured concrete or concrete masonry units (CMUs) A concrete floor slab
Figure 3-14 illustrates a vented crawl space with a concrete foundation wall. The insulation consists of foil-faced polyisocyanurate attached to the bottom of the floor joists, with all joints sealed and tape to prevent moisture accumulation in the wood structure. Batt insulation is placed between the floor joists over the rigid foam.