Boral Flashing Replacement in Seattle, WA

Boral Flashing Replacement: The Seattle Owner’s Guide

Boral flashing replacement in Seattle typically runs $340-$780 installed, depending on roof pitch and accessibility, and we stock common Boral profiles on our trucks for same-day repair in most Seattle neighborhoods. Most homeowners discover the problem during our heavy fall rains, when water shows up inside long after the actual failure started. If you’re seeing staining near valleys, chimneys, or wall transitions on a Boral roof system, the flashing is often the silent culprit that outlasted its seal but not its metal.

Call (866) 850-9676

Which Boral Models This Applies To

Boral’s flashing systems pair with their concrete and clay tile lines, including the Saxony Slate, Villa, and Shake profiles that remain common across Seattle’s older neighborhoods from Magnolia to Mount Baker. The critical compatibility point is the batten spacing and tile profile depth, not just the flashing width. Boral’s OEM valley and step flashing uses a heavier-gauge aluminum or copper with a specific hemmed edge that locks into the tile lug without crushing it.

We carry both Boral-specified OEM replacement and a qualified aftermarket equivalent from Custom-Bilt Metals that matches the gauge and hem profile for most residential applications. The aftermarket saves roughly 15-20% on material cost without sacrificing the critical dimensions. For heritage clay installations in neighborhoods like Capitol Hill or Queen Anne, where the original Boral copper has patinaed in place, we source matching copper to maintain the visual continuity that aluminum disrupts.

To identify your part: check the tile underside for a stamped Boral lot number, or measure the exposed flange width and the return leg that tucks beneath the tile. Our technicians carry a full profile gauge set on every truck.

Signs Your Boral Flashing Replacement Is Failing

• Water staining on interior ceilings below valleys or walls. Boral tile roofs shed water aggressively, so any interior sign means the flashing’s counter-flashing seal has separated or the pan itself has cracked at the fold. Seattle’s freeze-thaw cycles work the metal at stress points until the seal fails.
• Visible rust streaks on tile faces below metal transitions. Boral’s aluminum flashing resists corrosion, but galvanic reaction with incompatible fasteners or debris-trapped moisture will pit the metal from the fastener hole outward. We see this most often on north-facing slopes where moss holds moisture against the flange.
• Lifted or displaced tiles at ridges or hips. The Boral system relies on flashing clips and mortar-free installation in many profiles. When the flashing substrate warps or the fastening pattern loosens, tiles ride up and break their interlock. This is not a tile problem; it’s a flashing support problem.
• Daylight visible from the attic at wall or chimney junctions. Step flashing on Boral installations should create a continuous water barrier even if individual tiles shift. Gaps here mean the flashing has pulled, corroded through, or was never properly integrated with the wall counter-flashing.
• Granule or mortar debris in gutters below transition areas. On older Boral installations with mortar-set hips, failing flashing allows water to back up and erode the bedding. The debris you see is the symptom; the flashing breach is the cause, and it will accelerate until the mortar bed fails entirely.

Replacement Cost & What’s Included

What drives the range: roof pitch (anything over 6/12 requires tie-off and slows the crew), tile type (concrete is heavier and more fragile to remove and reset than clay), and whether we’re matching existing patina or replacing a full run. Our estimate includes removal and proper disposal of the failed flashing, installation of the replacement with Boral-specified fasteners, sealant at all penetrations, and reset of any disturbed tiles. Every flashing job carries our 90-Day Done Right Promise - if water finds a path we missed, we come back and make it right, no paperwork, no argument.

DIY or Call Us?

There’s an honest middle ground here. A homeowner can safely walk the perimeter with binoculars to spot rust streaks, lifted tiles, or gutter debris. You can check the attic during daylight for pinholes of light at transitions. What you cannot safely do is disturb a Boral tile roof from above. These tiles break underfoot if stepped wrong, and the interlocking system means one misplaced foot compromises multiple courses. The flashing itself is not dangerous like a garage spring, but the work environment is: steep pitches, moss-slick surfaces, and the structural risk of a fall.

We also see well-meaning DIY repairs that used standard box-store flashing with the wrong gauge or hem profile. It lays flat, it looks fine, and it fails inside of two Seattle winters because it never locked into the tile lug properly. If you’ve identified a problem, call (866) 850-9676 and we’ll give you a straight answer on whether it needs immediate attention or can wait until dry weather. The estimate is free either way.

FAQs