The footing was the concrete pad at the bottom of the foundation. Wider than the wall it supported because the footing spread the weight of the building across the earth the way a snowshoe spreads the weight of a man across the snow. The footing was the building's handshake with the ground. The building said I need to stand here and the footing said I will make sure the ground agrees.

The footing was the first thing they built and the last thing anybody saw. You dug the trench and poured the concrete and the concrete set and then you built the foundation wall on top of the footing and then you backfilled the trench and the footing disappeared. The footing did its work in the dark for the life of the building. Fifty years. A hundred years. Two hundred years. The footing never moved. The footing never complained. The footing was the most patient part of the building.

The footing was sized to the soil. Clay needed a wider footing because clay is soft. Rock needed a narrower footing because rock is hard. Sand needed the widest footing of all because sand shifts. The mason who dug the trench read the soil the way a doctor reads a pulse. The soil told the mason everything he needed to know about how big to make the footing. The modern engineer reads a soil report. The soil report is data. The mason's hands were data that could feel.

The footing cracked when it settled. Every building settles. The weight of the building pushes the footing into the soil and the soil compresses and the building drops a fraction of an inch. The settling is normal. The crack is normal. The crack in the footing is the building finding its balance. A building that does not settle is a building that is not heavy enough to be taken seriously. The crack is the signature of gravity. The engineering that prevents all cracking prevents the building from being honest about its own weight.

Nobody thinks about the footing. The footing is below grade. The footing is underground. The footing is the most important part of the building and nobody has seen it since the day they poured it. The owner thinks about the roof. The tenant thinks about the windows. The architect thinks about the facade. Nobody thinks about the footing until the wall cracks and the floor tilts and somebody digs down and finds the footing and the footing is still there doing exactly what it was told to do on the day it was poured. The footing does not fail. The soil fails. The footing just tells the truth about what happened underneath.

See also: Joist, Ridgepole