In Defense of the Unfinished Surface

We poured the slab, stripped the boards, and stopped. The argument for leaving béton brut exactly as the formwork left it — form-ties, grain, and all.

For two weeks last winter I argued with a contractor in São Paulo about a wall. He wanted to plaster it; I wanted the form marks left exactly where the plywood had pressed them. He thought it looked unfinished. It was finished — that was the whole point.

The Honesty of the Tie-Hole

A board-formed wall keeps a record of how it was made: the seams between panels, the small recessed holes where the form-ties held the boxing together against the wet pour. Cover that with render and you erase the labor. Leave it, and the gray ground starts carrying a single bright red line of circulation across it — a stair, a handrail, a sliding partition — and suddenly the building tells you exactly where to walk.