Hidden Threats: Why being thorough can save your life
Here’s a great example of how being persistent about looking in all the hard-to-reach places revealed a life-threatening defect that the owners never knew of. This picture shows the inside of a chimney system’s ash pit, which is the portion of the chimney below the fireplace. This is typically not visible, and the only access to this space is through the cleanout door at the base of the pit. To get a look here, we will stick our camera through the ash dump and take a photo looking up and down.
To orient you, this picture was taken looking up; the plywood you see is the underside of the fireplace hearth. That’s the first problem; that plywood is a fire hazard as embers can fall into the ash dump and ignite it. You can see some singe marks around the opening. Removing the plywood is an expensive repair, as it involves opening up the chimney so a person can climb inside and cut the plywood out.
But that’s not the only thing going on here. Look at the lower left; see the silver pipe coming through the chimney wall? That comes from the water heater exhaust. If you look at the upper left of the plywood base, you will see a round opening; this is probably where the water heater vent pipe should have been connected to. Instead, it is dumping the exhaust — which contains Carbon Monoxide — directly into the chimney, where it can easily flow through the fireplace ash dump opening and enter the house.