What the difference is between a ground beam and a strip foundation and why choosing the right one for the specific ground conditions and structural loads is a decision that cannot be made without proper engineering assessment

Ground beams and strip foundations are both linear reinforced concrete elements that sit beneath load bearing walls and transfer vertical loads from the structure above into the ground below. From a distance they can look similar on a drawing and serve a comparable function in the overall structural hierarchy of a building. But the way they work structurally, the ground conditions they are suited to, and the consequences of specifying one where the other is required are fundamentally different, and the choice between them should always be the output of a proper engineering assessment rather than a default based on what has been used on similar projects in the same area.

A strip foundation bears directly on the ground beneath it, spreading the wall load over a sufficient area of soil to keep the bearing pressure within the allowable limit for that soil type. Its performance depends entirely on the ground beneath it being capable of providing uniform, stable support throughout the life of the building. A ground beam spans between pile heads, carrying load independently of the ground between those support points. Its performance depends on the piles beneath it and on the beam itself being structurally adequate for the loads and spans involved, not on the ground between pile positions providing any support at all.

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