What kind of foundation should I choose for a house on clay soil?
We're building in the Moscow Region, the plot is on clay soil, groundwater is shallow. Which type of foundation would be more reliable and cost-effective - pile, strip, or slab?
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I agree with the pile foundation option, but I'll clarify - if groundwater is actually close to the surface, you need either driven or bored piles below the frost line and below the aquifer, otherwise it won't do any good. A slab foundation is also an option if money's no object, and you'll sleep better at night - the slab "floats" on clay and isn't afraid of ground shifts, but it costs a pretty penny.
On clay with shallow groundwater, I'd go with a pile foundation - it's the most reliable for these conditions since it bears on denser soil layers below. A strip foundation is risky here, clay loses its bearing capacity when it gets wet, and frost heave can cause uneven settlement. A slab would be pretty expensive, though it's also a workable option if your budget allows for it. In the Moscow region there are lots of houses built on piles for these kinds of soils, so it's a tried and tested solution.
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