They are like snowshoes. If you stick your foot in the snow, it sinks. If you stick your foot in the snow while wearing snowshoes or skis, they do not sink!
Here’s a worse sounding example. If I were to take a stick and poke you in the chest with it, it will hurt you and possibly even stab into you. If you put a book between the stick and your chest and I poke the stick with the same force…you will not be hurt by it.
This is because the book (foundation) is spreading out the force of the stick(the weight of the house along the load bearing walls).
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