A garage slab foundation is the most common type of foundation used for garages. It is also one of the most cost-effective and easy-to-install solutions. A garage slab foundation is a concrete slab that is poured directly onto the ground. 

This type of foundation is durable and strong, but it needs to be designed and installed correctly to ensure that it will last for years. When designing a garage slab foundation, the most important factor is the soil conditions of the area. 

This information will help the engineer determine the depth and width of the slab that is needed. There should also be a layer of crushed stone or gravel under the slab to help provide drainage and prevent the concrete from cracking.

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The type of concrete mix used for the slab should also be taken into consideration. A higher-strength concrete mix is usually used for garage slab foundations, as it is more resistant to cracking and will last longer. 

The edges of the slab should also be designed with a slight angle to help prevent water from pooling around the edges. A lip or bevel of 1-2 inches should be designed around the perimeter of the slab to help drain water away from the foundation.

Finally, the slab should be sealed with a concrete sealant to help protect it from moisture and freeze/thaw cycles. This will help to prevent the slab from cracking due to the expansion of freezing water. The sealant should be applied after the concrete has cured for at least 28 days.