Source GM Core pg. 96
Walls are where architecture, class, and survival meet—what you build them from decides whether they keep out nosy neighbors, small‑arms fire, or the vacuum itself.
A wall can be decorated drywall between neighbors or a nanocarbon belt that keeps a city from spilling into the Rift.
Well‑built exteriors: Inner Sphere towers and Commission stations wrap themselves in steel, concrete, brick‑equivalents, ferrocrete, or starship‑interior composite panels—smooth, often Climb DC 30–40 surfaces that laugh off small‑arms fire.
Cheap or temporary shells: Frontier habs and slum stacks use wood, plastic, and scrap panels, just strong enough to hold pressure and stop casual intrusion, easy for a determined raider to breach with time and tools.
Interior partitions: Inside, many walls are no more than thin planks, composite panels, or even thick fabric or paper in frames, providing privacy and a little acoustic dampening but very little real protection.
Underground and bunker walls: Deep facilities and asteroid burrows rely on solid rock and reinforced masonry or concrete to hold off collapse; breaching them is a mining job, not a combat action.
Nanocarbon and starship‑interior walls are the gold standard of modern protection—ubiquitous in reactor rooms, hangar rims, and outer hull layers. Transparent aluminum fills the niche of armored viewport and luxury facade, letting the rich see the stars without eating hard vacuum.