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Prefabricated Chimney Firestop Installation

Prefabricated chimney diagram.

Prefabricated chimney diagram.

Deep within the bowels of your prefabricated chimney’s chase is something called a “Firestop”. Do you have any guesses as to what it does? I’ll give you a hint….. who’s buried in Grant’s tomb?

Just as its name implies, a firestop stops fires…well, sort of…it actually just slows them down.

A firestop is a horizontal fire-blockade constructed of non-combustible materials (usually sheet metal or gypsum board) and/or plywood of a minimum thickness. It’s job is to make sure that if a fire starts somewhere within your hollow wooden framed chimney chase, it’s spread will be slowed down as much as possible until your friendly fire department can get there to put it out.

Outside view of a prefab chimney.

Outside view of a prefab chimney.

In the absence of a firestop, a fire inside of your chimney chase would likely spread so rapidly that fire crews couldn’t respond quick enough to save your home, or worse yet, before you and your family were able to escape safely.

Building code requires that a firestop be installed anywhere the chimney passes through a ceiling or floor, and the material directly surrounding your chimney pipe be constructed of galvanized sheet metal not less than 26 gauge.

Looking straight down a hollow wooden chimney chase, you can see the firestop missing.

Looking straight down a hollow wooden chimney chase, you can see the firestop missing.

Problem solved. The new firestop is installed and in position to do it's job.

Problem solved. The new firestop is installed and in position to do it’s job.

If it is discovered that your chimney has a missing or damaged firestop, A to Z recommends you not burn fires until you hire a professional to bring it up to code as soon as possible.

AtoZ's chimney sweeps are professionals!

AtoZ’s chimney sweeps are professionals!

We are very good at installing firestops in very tight quarters.

We are very good at installing firestops in very tight quarters.

Keeping the flashing in good repair is one of the best and simplest ways you can guard against unwanted water leaks. If your prefab chimney needs this repair, call on A to Z for dependable, quality work.


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Dear A to Z,

I just wanted to thank you for your honesty and for a thorough inspection of my chimney. One of the biggest concerns I have when hiring service professionals is being taken advantage when not having first hand knowledge of the various procedures. Last year when I had my chimney swept by one of your competitors, they claimed that I had a chimney fire, and that my flue was now cracked and needed extensive repairs.

This year, I hired A to Z to come out and sweep and inspect the flue because I heard they inspect the chimneys with a Chim Scan camera at no additional charge. The technician who came to my home, assured me I would be able to see any cracks or hazardous conditions along with him as he video scanned my flue. To my utter delight, NO EVIDENCE OF A CHIMNEY FIRE OR DAMAGE IN MY FLUE WAS DETECTED!!! Chris was extremely detailed in his inspection and really took his time educating me so I could feel comfortable. It was obvious that he knew what he was talking about and truly interested in doing the right thing…a far cry from last year’s experience with the other company. If anyone asks for an HONEST, COMPETENT, AND PROFESSIONAL chimney sweep company, I'll be sure to recommend A to Z!

~ Ms. Randi Scott, Lincoln, CA
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