How to Install a Chimney Cap

By Gene and Katie Hamilton

Tools Required
  • Measuring tape
  • Screwdriver
  • Ladder
Materials Required
  • Chimney cap
  • Screws

Before You Begin

Here are the installation steps in install a chimney cap. Not sure about tackling this job? Click Home Advisor, a free referral service that matches homeowners with local contractors.

  • Step 1 : Measure the inner opening of chimney

    Measure the inner opening of chimney

    Inspect the chimney flue and measure its inside dimensions to determine what size cap to buy. The caps come in a range of sizes from 9-in. square to 13-in.-by-18-in. in black metal or stainless steel. You'll see the package features a minimum and maximum opening size, so choose a size within the range.

  • Step 2 : Position and fasten the cap

    Position and fasten the cap Steady the ladder against the roof and carefully position yourself so you can work on the chimney. Place the cap on top of the chimney and insert the flue tabs of the cap into the chimney.

    Position and fasten the cap

    Use a screwdriver to fasten the screws that came packaged with the cap to hold it in place. Secure all the screws around the outside of the chimney cap base to hold it in place.

    Illlustrations courtesy of Deflecto Corp.