Welcome to Unitech SA, your trusted partner in construction right here in Johannesburg. We are proud builders who provide excellent services, including crafting strong raft foundations. Let’s dive into what a raft foundation is, why we use it in construction, and the fantastic benefits it brings.

What is a Raft Foundation?
A raft foundation, also called a mat foundation, is a big concrete slab that covers the whole area under a building. This solid slab mat foundation distributes the load of the structure evenly across a wide area. A raft foundation spreads weight evenly, unlike traditional foundations. It is ideal for soft or unstable soil because it supports the building at multiple points.
Why Do We Use Raft Foundations?
Here in Johannesburg, soil conditions can vary quite a bit. We frequently select mat foundations for our projects.
Mat foundations are best for keeping buildings stable on weak soil. They help ensure safety and stability. By distributing the load evenly, we can prevent settlement issues and keep your structure standing strong.

Types of Mat Foundations
There are several types of raft foundations that we employ, each suited to different types of buildings and load requirements:
- Solid Slab Raft Foundation: This is a continuous, reinforced concrete slab that covers the entire building area. Perfect for distributing heavy loads across a larger area, ensuring stability.
- A slab beam raft foundation combines a slab with reinforced beams to give extra support to load-bearing walls and columns.
- Piled raft foundation is used for buildings with heavy loads or on soft soil. Piles are driven into the ground to support the raft. This type of foundation is ideal for providing stability and preventing settlement. It is a popular choice for construction projects that require extra support.
- Cellular Raft Foundation: It has a floor slab and interconnected cells that make the foundation lighter without losing strength.

Benefits of Raft Foundations
- Raft foundations evenly distribute the weight of a building across a large area, providing better load distribution. This is crucial for large structures or those built on weak soil. By doing so, we can prevent differential settlement and avoid structural damage.
- Versatility: Raft foundations are incredibly versatile, making them suitable for various building types—be it residential, commercial, or industrial. They work especially well for buildings with large footprints or unique shapes.
- Less Excavation Needed: With raft foundations, we don’t need to dig as much as we would for other types of foundations. This not only saves time but also reduces costs related to digging and soil removal. Efficiency is key, and we’re all about providing cost-effective solutions for our clients.
- Enhanced Stability: In areas prone to seismic activity or ground movement, raft foundations offer superior stability. The solid slab moves as one piece, reducing the chance of cracks or failures during earthquakes or ground movements.
- Quick Construction: Building a raft foundation is a relatively quick process. Once the site is prepared, the concrete slab can be poured in a single operation, speeding up the overall construction timeline.
- Materials may cost more at first, but overall expenses are lower due to reduced digging, quicker construction, and less expensive labor. This is because the initial investment in materials pays off in the long run.
- Less digging means less time and effort spent on construction. Faster construction also means less money spent on labor costs. Plus, long-term savings from decreased maintenance and repairs make raft foundations a smart financial choice.

Why Choose Us for Your Mat Foundation Needs?
At Unitech SA, we’re more than just builders—we’re your partners in bringing your construction vision to life. Our team of experienced engineers and builders understands the ins and outs of local soil conditions and building regulations. This expertise ensures that every raft foundation we build is up to the highest standards.
Our engineers use advanced techniques and modern equipment to ensure accuracy and quality in all projects. We use top-notch materials and follow strict safety rules to make sure our mat foundations are strong and dependable.
In Johannesburg, Unitech SA is dedicated to being your top choice for construction projects in the changing industry. Our expertise in raft foundations, combined with our dedication to quality and customer satisfaction, sets us apart. Our raft foundations make buildings stable and strong for homes, businesses, and factories, ensuring safety and longevity.
Let’s build something great together! Contact us today to learn more about how our raft foundations can benefit your next project.
Our Professional Services Include:

Office: 010 023 0507
Business Whatsapp: 079 526 1950
Email: admin@unitechsa.co.za
Norman Koster – 066 239 0382
Desiree Koster – 082 608 2291