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Top Mount Chimney Caps: Measuring & Selecting

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HomeArticle Library >  Top Mount Chimney Caps Measure > 

How to Select and Measure for a Top Mounted Chimney Cap

 for Single or Multiple Flues:
Chimney Caps That Attach to the Chimney Crown

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Top Mount Chimney Caps attach to the chimney crown: Top Mount Chimney Caps attach with chimney cap adhesive or with Tapcon screws through the flanges into the concrete crown.


Top Mount Chimney Caps (typically used with Gelco Model C galvanized top mount chimney capmultiple flues but Gelco Model C copper top mount chimney capalso used with chimneys with a single flue) mount on the concrete crown of the chimney.  You can attach them either with Tapcon screws that go through pre-drilled holes in the chimney cap flanges and then into the crown, or you can attach them with Chimney Cap Adhesive that affixes the chimney cap flanges to the cement crown.

 

 

Which metal is best for a top mount or multi-flue chimney cap?  Multi-flue chimney caps are manufactured from stainless steel, copper, and galvanized steel. Stainless steel is the best value for the dollar. Copper is the most elegant, especially for historic or upscale homes. Stainless steel and copper chimney caps come with a lifetime warranty. We can have some stainless steel top mount chimney caps powder coated with black or colored heat resistant finishes for you. Galvanized steel is the least expensive and the least durable.  Galvanized steel chimney caps are painted black.

Copper is not recommended for light colored chimneys. Stainless steel is the preferred metal for salt water climates. 

Whether you are using a top mount chimney cap for one or more flues, here's how to measure for and select the right chimney cap:

What to Measure:

 

You need to take three measurements in order to choose the correct top mount chimney cap. 

  • First, measure the length and width of your entire chimney, as shown by the red dotted line in the diagram to the right.
  • Next, measure the length and width of a rectangle just big enough to include all the flues on your chimney, as shown by the black dotted line. This is the minimum screen size.
  • Last, measure the height of the tallest flue above the top of the chimney, as shown by the blue dotted line .
Measuring for Top Mount Chimney Caps: Chimney Size and Screen Size
Measuring to Determine Chimney Cap Height: 5 inches taller than the tallest flue


Your chimney cap can be any screen size between the dotted red rectangle and the dotted black rectangle. Most chimney caps have mounting flanges that add 1 1/2 inches to each side of the screen. So, for example, a top mounting chimney cap with a screen size of 13 by 17 inches will cover 16 by 20 inches of the top of your chimney. The Assemble-It-Yourself Whitecaps chimney caps and Protector Top-Mount chimney caps can be installed with the mounting flanges inside the screen (facing toward the flues) or outside of it (facing toward the edges of the chimney.)

  • If your goal is to protect the top of your chimney from deterioration caused by weather and acid rain, choose the largest screen size that will fit within the red dotted line. 
  • If your goal is to be as economical as possible, select a chimney cap the size of the black dotted line.


Some chimney caps are taller than others. The height of the screen part of a chimney cap is the screen heightThere must be at least 5 inches of clearance between the top of your tallest flue and the lid (or roof) of the chimney cap. Select a chimney cap with a screen height 5 inches above your tallest flue (at least 5 inches taller than the blue dotted line.)

 

 

Top Mount Multi-Flue Chimney Caps: Copper Chimney Caps by Whitecaps, with FREE Shipping!

Whitecaps Copper Top-Mount Chimney Caps
Over 450 Stock Sizes: from 9" x 9" to 29" x 41"
Custom Sizes Available, Too!
8", 10", 12" & 14" Screen Heights
With Regular 2 1/2" Overhang Lids
or Large 4/12" Overhang Lids
 

Chimney Protector Chimney Caps in 4 heights and 100's of sizes

Chimney Protector Top-Mount Chimney Caps
Over 3600 Stock Sizes : from 9" x 9" to 28" x 58"
8", 10", 12" & 16" Screen Heights
Standard 3/4 Mesh or California Code 5/8 Mesh
 

Top Mount Chimney Caps for Multiple Flues: Whitecaps Stainless Steel Chimney Caps, with FREE Shipping!

Whitecaps Stainless Steel Top-Mount Chimney Caps
Over 450 Stock Sizes: from 9" x 9" to 29" x 41"
Custom Sizes Available, Too!
8", 10", 12" & 16" Screen Heights
With Regular 2 1/2" Overhang Lids
or Large 4/12" Overhang Lids
 

Large selection of chimney caps including hundreds of Sizes of Chim Cap Multi-Flue Stainless Steel Forever Chimney Caps.

Chim Cap Stainless Steel Top-Mount Chimney Caps
Over 85 Stock Sizes: from 9" x 9" to 28" x 28"
Custom Sizes Up to 73" x 73"
All 10" Screen Height
 

Chimney Caps for Multiple Flues that Mount to the Top of the Chimney: Stainless Steel Gelco Chimney Caps for Multiple Flues, all with FREE Shipping!

Gelco Stainless Steel Top-Mount Chimney Caps
22 Stock Sizes: from 9" x 9" to 17" x 58"
8", 12" & 16" Screen Heights
Custom Sizes Available
 

Gelco-Galv-Multi-Cap-150x85

Gelco Galvanized Top-Mount Chimney Caps
8 Stock Sizes: from 14" x 14" to 17" x 41"
8", 12" & 16" Screen Heights
Custom Sizes Available
 

Designer Lattice Chimney Caps: Top Mount Vergigris Copper, stainless steel, or copper lattice chimney caps in any size you want, with FREE Shipping!

Designer Lattice Top-Mount Chimney Caps
in Verdigris Copper, Copper or Stainless
30 Stock Sizes: from 8" x 8" to 36" x 36"
10" Screen Heights, Any Custom Screen Height
Custom Sizes Available

 

 

 

 

 

 

Still have questions about just what type of flue you have or which chimney cap you should select? Just call our friendly Chimney Cap Experts at 888-834-7375 or e-mail us your question or concerns.

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