Chimney Chase Cover Measurement

Certified Boston Chimney Services

Guaranteed Chimney of New England is Boston's leading chimney service company. As part of our chimney cap repair services is the repairing and replacing of chimney chase covers. Chase covers are used at the top of chimneys in order to keep out animals, snow, rain and whatever else that could enter your chimney. The chase cover should cover the entire top of your chimney and is frequently used to cover chimney chase surroundings. When done properly it should have no holes or openings and should be able to simply slide on top of the chimney like a shoe box cover. When that happens, you know the measurements were done correctly. 

What are Chase Covers?

Chase covers are an external top covering for a pre-fab chimney or a brick chimney. They are used to keep the rain, snow, animals and whatever else out from entering your chimney. 

There are several choices of materials when selecting a chase cover, but stainless steel or copper are the best choices for long-lasting efficiency and safety. Pre-fab chimneys have a metal covering to prevent water from seeping into the inside of your chimney. Most chimneys come with an original chase cover that is made from cheap sheet metal and will need to be replaced once minimal erosion begins.

When you begin to see rust stains on the outside of your chimney, it will mark the first of many clues that you may need a chimney cap replacement or repair. Learn how to do measurements to custom fit a chase cover to your chimney.

How To Measure a Chimney Chase Cover

Length and Width

All measurements need to be done to the nearest 1/8". And make sure to measure all four sides. Mortar joints that are in between some bricks can be slightly different, which then causes the sides to be uneven. So sides may look similar, but they may not be. After the measurements, add 1/4" to provide for the correct tolerance for making the chase cover.

Hole Measurements

If a hole is required for the flue pipe to come through the cover, then it is necessary to measure the round pipe diameter and add 1/2" to that measurement. This extra bit is needed, because if the hole is not big enough then the pipe will simply not fit. The preceding gap between the pipe and the hole can be covered with an optional storm collar or sealed with a sealer.

Skirt Length

This length should be long enough to cover any exposed wood and allow for the fasteners to go through the skirt and into the structure that is behind it. This is for security purposes and ensuring the chase cover stays.

Collar Height

The standard height for a collar is 2" to 3", but can be 1" or even zero inches depending on how you want to install it. A collar will make sealing around the opening easier. And for a rectangular or square hole, you will have a clay tile flue liner protruding, which leads to a smaller height with the collar.

Drip Edge and Diagonal Creases

These are both options that can be added to the bottom of the skirt. The diagonal crease will prevent any water or snow from accumulating. The drip edges will keep any water from falling directly onto your siding or brick. When measuring, only the length, width and number of holes will determine the price of the cover.

Chase Cover Estimates

Guaranteed Chimney of New England is a trusted name in the chimney service industry. Please contact us today for more information about our various chimney services. The number to call is 866-528-1324. With your phone call you will receive a free estimate for whatever service you are looking for in regards to your chimney. We proudly service residents throughout the Boston area.

Chimney Service Estimate