Chimney Flashing Repair in Rancho Palos Verdes: Written Report, Licensed Technicians

Most homes along the Palos Verdes Drive South corridor and through RPV center were built in the 1960s and 1970s with factory-built prefab fireplaces. Those units had a projected lifespan of 20 to 30 years, which means they passed their end-of-life mark decades ago. When the firebox and chase age past that window, the metal housing shifts and warps. That movement pulls flashing away from the roofline, breaks sealant bonds, and opens gaps that channel water straight into your ceiling and wall cavities. A straightforward flashing repair on a masonry chimney in this area typically runs between $450 and $950, depending on whether you need step flashing replaced on one side or a full perimeter job with new counter flashing set into reglets. But when the underlying prefab chase has deteriorated, the scope changes.

Here's where the prefab factor matters to your wallet. If the chase cap is rusted through or the metal chase walls have corroded from decades of salt-air exposure, we can't just re-flash over a failing structure. The flashing repair then becomes part of a larger chimney repair scope that may include chase cap replacement, new storm collar installation, or cricket fabrication to redirect water away from the uphill side of the chimney. That broader job can range from $1,200 to $2,800. We quote after a physical inspection, not over the phone, because the difference between a $500 fix and a $2,000 fix is hidden under the roofline. We want you to know exactly what you're paying for before we start.

We start on the roof with a water test. Before pulling any flashing, we need to confirm the leak source. Stains on your ceiling could come from a cracked crown, a failed chase cap, or the flashing itself. In the Highridge Road area especially, we see homes where previous roofers caulked over old flashing instead of replacing it, which masks the real failure point. Once we confirm flashing is the culprit, we remove the existing material down to bare contact surfaces. On prefab chimney chases, this means inspecting the metal chase walls underneath for rust or perforation. Corroded chase walls can't hold new flashing, so we address that first. We then install new step flashing along each shingle course, weaving L-shaped metal pieces between layers so water always flows outward, never behind.

Counter flashing goes over the step flashing, tucked into a cut reglet in the stucco or masonry and sealed with high-grade polyurethane. We use lead flashing on masonry chimneys because it conforms to irregular surfaces, but on prefab metal chases we typically use aluminum with a baked finish that resists the marine corrosion common across Rancho Palos Verdes. If the chimney sits on the downhill slope of your roof, we'll install or rebuild a cricket, a small peaked diverter that routes rainwater around the chimney rather than letting it pool against the uphill wall. SoCal's rainy season between November and March is short but intense, and a missing cricket on a wide chase is one of the most common leak sources we find during masonry repair inspections. Every repair gets a follow-up water test before we leave the roof.

Flashing done right should last 20-plus years with periodic sealant maintenance. We document the work with photos and include a written scope summary so you have records for any future real estate transactions or insurance claims. If you want to understand roofing and flashing standards in more detail, the NRCA publishes current guidelines that align with how we approach every job.