Which problem increased when Roman fortifications switched from wood to concrete walls without weep holes in humid climates?

💡 Explanation

When concrete walls lacked weep holes and faced humidity, moisture buildup increased the fungal decay of organic material like timbers. Therefore, increased fungal decay results, rather than reduced projectile reisitance, iron oxidation, or seismic vulnerability which involve different material properties and environmental stress factors.

• Which mechanism allowed early suspension bridges, like China's ancient chain bridges, to span wider gaps?
• Which mechanism allowed 18th-century shipwrights to construct larger, more stable wooden sailing vessels for transoceanic voyages?
• Which structural mechanism employed in Roman fortifications reduced the success of siege ram attacks?
• Which structural consequence appears from geometrically similar arches not scaled proportionally with varying span?
• Which structural vulnerability appeared earliest in Roman castra fortifications utilizing a vallum with timber palisade construction?
• Which adjustment compensates for variation in observer latitude when using a historical astrolabe?