Concrete Slab
Main structural floor system.
Slab Foundation Cutaway Diagram
Full-width visual guide
Tip: A well-built slab foundation starts with proper site preparation and attention to each component. This helps ensure a strong, durable base for your new home.
Control Joints
Score cuts in the concrete help control cracking by creating weaker planes at regular intervals, typically 10–15 feet. Cuts are usually about one-quarter of the slab thickness.
Component Summary
What each part doesReinforcement
Adds strength and controls cracking.
Plumbing Pipes
Installed before the pour for drains and vents.
Electrical Conduit
Provides a pathway for electrical wiring.
Rigid Edge Insulation
Improves energy efficiency and helps prevent moisture issues.
Vapor Barrier
Blocks ground moisture from rising into the slab.
Compacted Aggregate Base
Supports the slab and promotes drainage.
Compacted Soil
Provides a stable, even foundation.
Thickened Edge (Footing)
Stronger perimeter for support and crack resistance.
Anchor Bolts
Secure the wood framing to the slab.
Before the Pour, Confirm
- Soil is properly compacted and ready to support the slab.
- Aggregate base is placed and leveled to support drainage and stability.
- Vapor barrier is continuous and properly lapped to reduce ground moisture.
- Plumbing pipes and electrical conduit are positioned before concrete placement.
- Reinforcement, anchor bolts, edge insulation, and thickened edges match the approved plans.
Important Notes
- Proper drainage around the home helps protect the slab.
- All work should meet local building codes and engineering requirements.
- Slab thickness, reinforcement, and footing details can vary by region and soil conditions.