Why was there no mortar in Inca architecture?

Why was there no mortar in Inca architecture?

• A. Because the lack of mortar made buildings less likely to collapse in case of earthquakes.
• B. Because mortar was unavailable locally.
• C. They used steel joints.
• D. Earthquakes were rare.

Answer: (B)

This question tests how material availability shaped Inca construction. The Inca built with dry-stone masonry, shaping stones so they fit together tightly without any binding material. This approach relies on precise cutting and the weight and friction of the stones to hold walls together, rather than cement or mortar. The reason mortar wasn’t used is that lime-based binders—needed to make mortar—were not available locally in the Andean region. Without those binding materials, the builders developed interlocking stonework that could endure loads and even absorb some seismic movements. It isn’t that the lack of mortar was chosen to prevent collapse or that earthquakes were rare; rather, the absence of compatible binding material dictated the construction method. Steel joints didn’t figure into Inca architecture, and earthquakes were a common challenge in the region.

This question tests how material availability shaped Inca construction. The Inca built with dry-stone masonry, shaping stones so they fit together tightly without any binding material. This approach relies on precise cutting and the weight and friction of the stones to hold walls together, rather than cement or mortar.

The reason mortar wasn’t used is that lime-based binders—needed to make mortar—were not available locally in the Andean region. Without those binding materials, the builders developed interlocking stonework that could endure loads and even absorb some seismic movements. It isn’t that the lack of mortar was chosen to prevent collapse or that earthquakes were rare; rather, the absence of compatible binding material dictated the construction method. Steel joints didn’t figure into Inca architecture, and earthquakes were a common challenge in the region.