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How durable do you think those walls would be. The players are thinking to break down the wall rather than traverse the planks layed out. They are suspicious of everything after the doppelgangers in the jail cell and the mimics in the prior room.
So what would you set the thickness to? 1 inch (Hardness 5/ 10HP)? I am trying to figure out how the bad guys are going to react to this tactic, suggestions welcomed.
The adventure states them to be superior masonry walls (on p.44, left column), the statistics can be found in the DMG on pp.59-60 (and on the pages suggested in the adventure).
By the way: my players did the exact same thing.
I thought that was the exterior walls. No matter, masonry will be harder to get through. What did the you know who's do? I have some ideas involving grapples and pulling.
The map shows a hole in the floor of the room beyond the planks. Although the text describes it as being unconnected to the water in the plank room, I determined as soon as I saw the map that any player who thought to investigate swimming under the wall would be able to cross through. None did, however, as a protection from evil and magic circle against evil kept the IS's at bay.[I assumed that stalkers would be subject to a cop evil as their description contains the word summon it its second sentance]