Introduction

This traditional, time-tested flashing method guarantees a leakproof fix. Follow this step-by-step process and you can fix the leak and save $100s.

Chimney leaking? Look for flashing problems

Figure A: Chimney flashing details

Family Handyman

Chimneys are notorious for leaking, and the culprit is almost always the sheet metal flashings. Just ask any roofer. But it doesn’t take an expert to spot problems—simply look for water-stained ceilings or other telltale signs of leaking in the vicinity of your chimney. So what is placed around a chimney to prevent leaks?

You’ll want to install new chimney flashing if it’s missing, rusted through, falling out or completely covered with roofing tar (a typical short-term fix that’s sure to be hiding bigger problems). It’s also a good time to install new flashing when you put on new shingles because you’ll want it to last as long as the new roofing (25 to 40 years).

In this article, we’ll tell you how to order new flashing and install it on a brick chimney. Our roof has asphalt shingles, but the procedure is the same for wood shingles. Slate and tile roofs require special flashing techniques that are best left to the pros. Flashing a chimney is an advanced DIY project. For starters, you have to be comfortable working on a roof. Then you have to measure, cut and bend sheet metal to fit precisely around the chimney and layer all the parts so they shed water. Even so, if you’re handy with tools and carefully follow our instructions and diagrams, you’ll be able to flash your chimney in a day. And as far as chimney flashing repair cost goes, by doing it yourself, you’ll save hundreds of dollars.

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