Apologies in advance if this is a silly question; I just want to clarify. I came across what I think is the same thing on two houses within a month, in the same neighborhood. It appears to me to be a small square brick chimney, which I assumed was originally ventilation for a wood-burning stove or something. Both were approximately in the middle of the house. Both had a metal grate on top and looking down from the top all i could see was bricks all the way down. Both terminate in the crawl space. On both reports I marked that a rain cap should be added.
But now I’m wondering 1) should a rain cap be added? They don’t appear to be in use for anything and the chase inside the house is walled over. I’m assuming rain cap should still be added so water doesn’t get into the crawl space, but a second opinion would be greatly appreciated.
and 2) what was the original purpose of these? I realize it’s probably not relevant for reporting but I’d like to be able to speak intelligently about these things. Were they necessarily originally built as a chimney or vent, or could they have originally been part of the structure or something else?