Boral Flashing Replacement Nationwide

Boral Flashing Replacement: The San Jose Owner’s Guide

Boral flashing replacement in San Jose typically runs $350 to $900 installed, depending on penetration count, roof pitch, and whether the surrounding tile needs resetting. We stock Boral-compatible flashing profiles on our trucks and can usually complete the swap the same day we diagnose it. Most homeowners discover the problem the hard way: a water stain on the ceiling after the first heavy rain of the season, or granules washing out of a valley where the flashing has pulled loose.

Call (669) 238-2101

Flashing is the metal or membrane material that seals the joints where your Boral roof meets a wall, chimney, skylight, vent pipe, or valley. When it fails, water gets behind the tile and into the decking. By the time you see the stain inside, the flashing has usually been failing for months. Here’s what you need to know about getting it replaced properly in San Jose, where our dry summers and sudden winter downpours put real stress on roof penetrations.

One note up front: Brennan Roofing Co San Jose is an independent roofing contractor, not a Boral factory service center. That matters because we’re not tied to one product line. We match the flashing to your existing Boral installation and the local conditions, not to whatever the manufacturer happens to push this quarter.

Which Boral Models This Applies To

Boral’s concrete and clay tile roofs in the Bay Area typically fall into three families: the flat-profile tiles (like the Boral Flat and Shake styles), the low-profile S-tile, and the high-profile two-piece barrel systems. The flashing requirements differ by profile height, because the metal has to step up far enough under the tile course above it to shed water properly.

The compatibility gotcha most owners run into: a flashing that worked for a flat Boral tile won’t necessarily have enough rise for a high-profile barrel tile. If your flashing was replaced at some point with a generic step flashing meant for composition shingles, it’s undersized for Boral’s taller profiles. That means water can blow up and under the tile in a wind-driven rain, which San Jose sees during winter storm fronts coming off the Santa Cruz Mountains.

For OEM versus aftermarket: Boral’s own flashing components are solid, but the lead times can stretch to two or three weeks on less common profiles. Quality aftermarket equivalents, fabricated from 26-gauge galvanized or pre-painted aluminum, are often on a shelf in San Jose today. For most residential replacements, the aftermarket option performs just as well. We’ll tell you which is worth waiting for and which isn’t. The label on the underside of a removed tile will usually give you the profile code, and we can match from that.

Signs Your Boral Flashing Replacement Is Failing

• Water staining on ceilings or walls near a chimney, skylight, or exterior wall. This is the classic symptom. Flashing at a wall intersection has a step pattern, and if one step pulls loose or corrodes through, water finds the gap. The stain almost never lines up directly under the failure point, which is why a real diagnosis matters.
• Loose or lifting flashing visible from the ground. Wind can work flashing loose over time, especially on the leeward side of the roof where the wind creates suction. If you can see metal flapping or standing proud of the tile line, it’s already compromised.
• Rust blooms or white corrosion on exposed flashing. Galvanized flashing in San Jose’s wet-dry cycles eventually sacrifices its zinc coating. Once the base steel starts rusting, the flashing has maybe one or two seasons left. Coastal-adjacent areas of San Jose see this faster due to airborne salt from the bay.
• Granule loss or cracked caulk around vent pipes and skylights. The rubber boot at a vent pipe degrades from UV exposure, and once it splits, water walks straight down the pipe into the attic. Caulk is a temporary fix, never a repair for flashing.
• Daylight visible from inside the attic at penetration points. On a sunny day, get up into the attic with a flashlight and look at where pipes and vents exit the roof. If you can see light through a gap, water is getting through that gap too.

Replacement Cost & What’s Included

Here’s what we’re seeing in San Jose right now for Boral flashing replacement:

• Single vent pipe boot replacement: $180 to $350 installed
• Chimney flashing repair (one side, re-secure and seal): $400 to $700
• Wall step flashing replacement (per 10 linear feet): $350 to $600
• Skylight flashing replacement (curb-mounted): $500 to $900
• Valley flashing re-fabrication: $450 to $800 per valley

The range is driven by tile profile height, how many tiles have to be reset, and whether we’re working from a ladder or need full staging. Every quote from us is a written line-item price before any work starts, and that number does not move at the door. The replacement includes new flashing matched to your Boral profile, resetting any removed tiles, sealant at all penetrations, and our 365-Day Done Right Promise in writing: if the repair fails within one year, we come back and make it right at no charge.

DIY or Call Us?

There’s one thing an owner can safely do: look for obvious signs from the ground or from inside the attic. You can spot loose flashing, rust, and daylight gaps without ever touching a ladder. That information helps when you call us, because it tells us where to start looking.

What we don’t recommend is getting up on a tile roof to replace flashing yourself. Boral tile is brittle, and walking it wrong cracks tiles and turns a $350 flashing repair into a $1,500 tile replacement job. Working at the roof’s edge with sheet metal and sealant while balancing on a ladder is how people get hurt. Flashing also has to be lapped correctly or it simply doesn’t work; a backwards lap looks fine and leaks like a sieve. Tell me what you’re seeing and I’ll tell you what it actually means. If it needs repair, call (669) 238-2101 and we’ll put a written price in your hand before any work starts.

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