Block and base foundations are common in older homes and regions with unstable soil conditions. While they offer advantages such as better ventilation and easier access to plumbing and electrical systems, they are also prone to specific issues that can compromise a home’s stability. Duratech Foundation knows that it is important to understand these problems and how addressing them can help homeowners maintain a safe and solid foundation.
What is a Block & Base Foundation?
A block and base foundation consist of concrete or wooden blocks that support a home’s structure, with wooden beams spanning across them to create the floor system. Unlike slab foundations, this type of foundation has a crawl space underneath, making it easier to inspect and repair. However, it is also more vulnerable to shifting, moisture damage, and wood deterioration.
Common Block & Base Foundation Issues
Uneven Settling and Shifting: Block and base foundations rely on multiple support points, and if the soil beneath them shifts, some blocks may sink while others remain stable. This can cause floors to become uneven and lead to structural instability. What signs to watch for:
• Sloping or sagging floors
• Gaps between walls and floors
• Doors and windows sticking or not closing properly
To repair these problems a few strategies can be implemented. Adjusting or adding shims between the blocks and beams can correct minor shifts. For severe cases, installing concrete or steel piers beneath the foundation can stabilize and lift it back to level.
Moisture & Wood Rot
Since block and base foundations have crawl spaces, they are prone to moisture accumulation, which can lead to wood rot, mold growth, and termite infestations. Some signs to watch for:
• Musty odors in the home
• Soft or bouncy floors
• Visible mold or mildew in the crawl space
To improve drainage, install French drains or gutters to direct water away from the foundation. For the crawl space, use vapor barriers and proper ventilation which can reduce moisture buildup. Rotted beams and joists should be replaced to maintain structural integrity.
Pier & Block Movement
Over time, the blocks supporting the foundation can shift due to soil movement, erosion, or poor initial construction. This causes gaps in the structure and can make the home unstable. Signs of pier and block movement to watch for:
• Noticeable tilting of support blocks
• Cracks in interior or exterior walls
• Wobbly or unstable feeling when walking through the house
To help to prevent pier and block movement, adding additional blocks or piers can help redistribute weight evenly. Using gravel or compacted soil under the blocks can prevent further shifting.
Foundation Inspection & Repair Services in Crosby, Cypress, Friendswood & Greater Houston, Texas
Block and base foundations are a reliable option for homes, but they require ongoing maintenance to prevent issues like moisture damage, shifting, and wood rot. By staying vigilant and addressing problems early, homeowners can ensure their foundation remains strong for years to come. If you are experiencing foundation problems or need an expert opinion, contact DuraTech Texas and schedule our services today.