What happens if a house is just built on a concrete slab?

Cost and Time Efficiency

One of the most significant advantages of a concrete slab foundation is its affordability. It requires less labour, fewer materials, and less time to construct compared to other foundation types. This straightforward approach not only reduces construction costs but also speeds up the overall building process, allowing residents to move in sooner.

Durability and Maintenance

Concrete slabs are known for their strength and longevity. They are resistant to pests such as termites and rodents, which can be detrimental to wood-based foundations. Additionally, slabs are less prone to decay and mould, assuming moisture is controlled, which translates into lower maintenance costs over the life of the home.

Energy Efficiency

A well-constructed slab can provide excellent thermal mass, helping to stabilise indoor temperatures by absorbing heat during the day and releasing it at night. This can be particularly beneficial in regions with significant temperature variations, reducing the need for constant heating and cooling and thereby lowering energy costs.

Moisture and Drainage Issues

Perhaps the most significant challenge with slab foundations is managing moisture. Poor drainage and inadequate sealing can lead to water seeping up through the slab, promoting the growth of mould and mildew inside the home. Proper site preparation, including effective grading and the use of moisture barriers, is critical to prevent these issues.

Comfort and Cracking

Concrete is a rigid material that can lead to hard, cold floors, which may be uncomfortable without the addition of insulating layers or soft floor coverings. Moreover, concrete can develop cracks over time due to environmental stresses such as settling and temperature fluctuations. These cracks not only affect the appearance but can also become entry points for moisture, necessitating timely repairs to avoid structural damages.

Accessibility for Repairs

Unlike homes with crawl spaces or basements, houses built on concrete slabs do not have easy access to plumbing and electrical systems once the slab is poured. Any repairs or modifications to these systems can be disruptive and expensive, as they may require cutting into the concrete.