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How to Replace a Rain Cap

Older rain caps for metal chimneys and flue liners can deteriorate or fall apart, but installing a replacement cap is as easy as climbing onto the roof.

By the DIY experts of The Family Handyman Magazine

How to Replace a Rain Cap

Older rain caps for metal chimneys and flue liners can deteriorate or fall apart, but installing a replacement cap is as easy as climbing onto the roof.

Check your rain cap for wear

High winds, sleet and plain old corrosion can cause a rain cap to break apart, rattle and leak water into your home. If you feel comfortable climbing up on your roof, you can replace the old one yourself for about $40. That’ll save about $150 in labor from an HVAC service company.

You can buy a new rain cap and a sheet metal crimping tool at any home center. Flues are usually 5 or 6 in. in diameter, so buy both size caps and return the unused one. You’ll also need three hex-head or Phillips self-drilling 1-in. sheet metal screws and a drill and bit.

Remove the old rain cap and toss it. Select the correct cap and check the fit (Photo 1). Then secure the new cap (Photo 2).

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

    • Cordless drill
    • Crimper

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

    • Rain cap
    • 1-in. self-drilling sheet metal screws

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