How to Say "joist" in Spanish
The Spanish word for “joist” is “viga” — B1 level.

Examples
La casa tiene una viga de madera muy antigua.
The house has a very old wooden beam.
Los arquitectos instalaron vigas de acero para reforzar el techo.
The architects installed steel beams to reinforce the roof.
Siempre ves la paja en el ojo ajeno y no la viga en el tuyo.
You always see the speck in someone else's eye and not the beam in your own.
Always Feminine
The word 'viga' is always feminine, so you must use 'la' or 'una' with it, even if it's a heavy steel beam!
Describing Material
To say what a beam is made of, use 'de' followed by the material (e.g., 'viga de madera' for wooden beam).
Confusing Viga and Vía
Mistake: “El tren corre por la viga.”
Correction: El tren corre por la vía. 'Vía' means track, while 'viga' is a support beam in a building.
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