Is a block foundation better than poured concrete?

Poured Concrete Foundations

Poured concrete foundations are known for their robustness and durability. They involve pouring concrete into pre-designed moulds or forms, typically at the construction site. Here are some of the key benefits and drawbacks:

Strength and Durability

Poured concrete is incredibly strong, making it resistant to the pressures of soil and water. It's less likely to shift or crack, providing a solid base for any structure.

Water Resistance

With fewer seams than block foundations, poured concrete offers excellent resistance to moisture, reducing the risk of water damage and basement leaks.

Maintenance

This type of foundation typically requires less maintenance over time due to its resistance to decay and pests.

Cost

Poured concrete can be more expensive initially due to the materials and labor required to set up forms and perform the pour.

Flexibility

Modifications or repairs can be challenging because concrete is difficult to alter once it has cured.

Block Foundation

Block foundations, or cinder block foundations, are constructed from individual blocks laid and bound together with mortar. This method has been traditionally popular due to its adaptability and ease of installation.

Cost-Effectiveness

Generally, block foundations are less expensive upfront, both in terms of materials and labour.

Flexibility

Easier to install, modify, and repair. Blocks can be added or replaced without disturbing the entire structure.

Accessibility

Ideal for sites that are difficult to access, where pouring concrete might be logistically challenging.

Strength and Water Resistance

While strong, blocks have more joints, which can become avenues for water seepage if not properly sealed.

Maintenance

Requires more maintenance to ensure the joints and the blocks remain waterproof and structurally sound.

Which One Should You Choose?

The decision between a block foundation and a poured concrete foundation largely depends on specific project needs and external conditions. Here are a few considerations to guide your choice:

Local Climate

In areas with excessive moisture or where freezing and thawing are concerns, poured concrete might provide better protection.

Soil Type

Poured concrete is often preferable in areas with volatile soil conditions because of its superior strength and stability.

Budget and Timeline

If you are constrained by budget or require a quicker installation, block foundations might be the way to go.

Long-Term Goals

Consider future modifications or expansions. Block foundations offer more flexibility for future changes.