How to Design Custom Chimney Caps that Work How to Design Custom Chimney Caps that Work

What You'll Need
Drawing board and pencils
Tape measure marked in centimeters
Notebook or tape recorder

Well-designed and fitted custom chimney caps will keep debris, birds and animals from getting into your chimney. Precise measurement and simple design will create a chimney cap that enhances the safety of your home and family.

Step 1: Measure Your Chimney Flue Top

Measure the length and width of the mortar crown of your chimney, where it narrows just below the flues. Add 1 inch to this dimension for the base size of the chimney cap. If you have more than 1 chimney flue, design a cap to surround all of them, allowing a more exact fit. Add 1½ inches to the base length and width for a mounting flange. This will be bolted into the mortar crown.

Step 2: Measure the Height of the Flue Tops

Measure to the top of all the flues. The chimney cap must be at least 4 inches higher than the tallest flue top for adequate ventilation of the chimney when capped.

Step 3: Sketch Your Chimney Cap

Make a detailed sketch of your chimney cap design including the mesh walls, ready for manufacturing in brass or copper.

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