Layered Walls

You can pick more than one material for your walls by simply noting both and adding the material costs together. This method is good for two things: extra thick walls (pick the same thing twice), and composites (a layer of iron over hewn stone).

When building a tall freestanding wall, you can substitute other materials (such as packed earth) for the extra layers required; however, these layers must be at least as thick as the layer of material they replace (which may require extra layers). For instance, if you replace a layer of hewn stone with packed earth, you must use a full 6-foot thickness of packed earth (which is actually the equivalent of two standard layers of packed earth). See Figure 3 for an example of a 30-foot-tall freestanding wall of hewn stone with a packed earth core (layers 2 and 3).

Lead-Lined Walls

Adding a thin layer of lead has no effect on a wall’s statistics (hardness, hp, break DC, climb DC), though it will block detection spells and other effects blocked by this material. This costs 1,000 gp per stronghold space (or per 1,600 square feet of freestanding wall) so protected.