A fire block is used around stairway walls to prevent two
things, just in case there ever was a fire in the home. The first thing
they do is prevent the fire from spreading into the next level and then
prevent the fire from getting fresh oxygen from another section of the
home.
Fire blocks are strategically positioned at stair
landings and next to stair stringers. They're usually located in the
wall framing, next to the stairway.
The white arrows in the picture above are pointing to a couple of
stairway fire blocks. After the walls have been drywalled, plastered or
finished, these blocks will be in the perfect position to do their job.
Fire blocks are also used through out the rest of the home, around the
ceiling framing.
If the blocks are positioned correctly around the stair landing, they
can also provide the floor trim installation carpenter with additional
backing to nail the floor trim into.
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