Step-by-Step Guide on How to Reflash a Chimney – Rochester Pro Roofing

A worker on a roof, wearing a hooded sweatshirt and a cap, is repairing a chimney. They have tool belts with various tools attached. The roof is covered with shingles and there are trees in the background.

At Rochester Pro Roofing, we often encounter a common issue plaguing homes in Monroe County: chimney leaks caused by poor flashing techniques. Whether we’re replacing an entire roof or focusing solely on chimney repairs, our process remains consistent, ensuring a durable, watertight solution every time. Here’s our step-by-step guide to reflashing a chimney the right way.

Step 1: Remove Old Materials

We start by carefully removing all the existing roofing material and metal flashing around the chimney. This allows us to assess the underlying structure and address any hidden damage that may have been caused by leaks over time.

Step 2: Inspect and Replace Decking

Next, we inspect the roof decking beneath. If it’s deteriorated or water-damaged, we replace it with the same material originally used—OSB if the house has OSB, or CDX plywood if that’s what’s present. Matching the decking ensures compatibility and maintains the roof’s integrity.

Step 3: Install High-Quality Ice and Water Shield

To provide an extra layer of protection, we tie in a premium ice and water shield, extending it from the roof decking up to the chimney. This critical barrier safeguards against water infiltration, especially during heavy rain or snowmelt.

Step 4: Install Wall and Step Flashing

With water flow in mind, we install the wall flashing and step flashing starting from the bottom and working our way up. We integrate the shingles and flashing simultaneously, shingling upward to ensure water is directed away from the chimney. This methodical approach prevents leaks by mimicking the natural path of water.

Step 5: Seal the Metal Flashing

Once the flashing is in place, we seal the metal as needed to prevent water from seeping down the masonry and into the new flashing. Where the flashing embeds into a groove we’ve cut in the chimney, we apply a high-quality sealant. This secures the metal and adds an additional waterproofing layer.

Step 6: Final Touches for a Watertight Finish

When we’re done, your chimney is completely watertight, capable of withstanding even the most intense rain events without letting a single drop inside. Our meticulous process ensures long-lasting protection for your home.

Chimney leaks don’t stand a chance with Rochester Pro Roofing. Whether it’s a full roof replacement or targeted chimney work, our expert team delivers the same high standard of care. Call Rochester Pro Roofing today for a free evaluation and let us solve your chimney woes with precision and expertise!

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