Block chimneys are really meant to be surrounded with bricks.
Attic concrete chimney fire blocking old homes.
Basically have your chimney lined as soon as possible.
Block chimneys in old houses.
If fire blocking or stopping is not in place the space between each of the wall studs acts like its own high velocity chimney.
Block chimneys do work but as a general statement they are less than desirable.
Fire blocking between studs.
If a fire starts within the wall the top block stops the fire from getting into the attic.
On average seven people died in home fires every day between 2011 and 2015.
During a remodel of this type of house it is wise to install fire blocking at the top and bottom of the stud walls.
You can think of it like we re filling the smoke chamber with concrete.
But imagine what happens if you do put a solid piece of wood at the bottom and top of the wall in between all of the wall studs in this house.
They are more subject to cracking leaning and leaking.
We then allow this concrete like material to harden and then remove the blocking from the fireplace damper.
After a fire has been put out by the fire department they may say the house is basically safe structurally or that it is not safe and the city building inspector checks the house for safety.
Draft fire blocking fire departments in the united states respond to more than 350 000 home structure fires each year according to the national fire protection association.
The bottom block stops the fire from getting into the wall cavity to begin with.
Most any problem you can imagine.