
Building Materials Collection
Flashings
Aluminum & Galvanized Steel Flashings
General-purpose flashing for residential roofing and siding details. Heavier-gauge .024″ aluminum flashing for headwall transitions and chimney bases; Z-flashing for horizontal joints above doors, windows, and siding courses; galvanized steel porch flashing where structural-adjacent rigidity matters more than weight.
Built for Performance. Designed for Life.
Builder-Grade Material
Aluminum trim coil, galvanized steel, and engineered membranes. Honest gauges, honest specs.
Finish-Matched to the Lineup
Black and White on every aluminum profile so your fascia, soffit, drip edge, and F-channel read as one system.
Project-Ready Lengths
Standard 10' and 12' lengths sized for residential framing. Coil nails ship by the carton, membranes by the roll.
The Flashings Lineup
Three builder-grade SKUs, sized and gauged for residential work, finish-matched across the line.

Aluminum Flashing
10′ · .024″4″ × 5″ × 10′
General-purpose pre-bent aluminum flashing for headwall transitions, chimney bases, and skylight perimeters. .024″ — heavier than the Step Flashing range.

Metal Z Flashing
10′ · .018″2.05″ × ¾″ × 0.4″ × 10′
Z-profile flashing for horizontal joints between siding courses, above doors and windows, and at trim transitions. Sheds water past the joint below.

Galvanized Steel Porch Flashing
10′ · galvanized steel2.5″ × 1.5″ × 0.25″ × 10′
Heavier-duty galvanized steel flashing for porch-to-wall transitions and structural-adjacent details. Stronger than aluminum at cost of more weight.
Frequently Asked Questions
Specs (gauge, length, coverage, weight) follow standard residential conventions, but our building materials are not currently sold with code-compliance certifications (ASTM, UL, etc.). If your code official requires documented testing for a specific assembly — e.g. wind-resistance testing on synthetic underlayment, or fire-rating on an ice-and-water shield — contact us before specifying and we'll confirm what documentation is available on a SKU-by-SKU basis.
Yes. Larger orders ship from our Michigan warehouse on standard 40" × 48" pallets, and full-container or partial-container quantities can be sourced direct. Email sales@shorelinebrand.com with a takeoff and we'll quote.
Specs are shown in both. Aluminum trim coil is most often spec'd in thousandths-of-an-inch (.018", .024") in the US, while our manufacturing partners spec in mm. We carry both on every spec table so you can match a takeoff against either standard without doing conversion math on site.
The Black soffit is 0.38mm and the White is 0.40mm — a real and intentional spec difference, not a typo. For most residential soffit applications the 0.02mm spread is below the threshold a builder will notice or specify against, but we list both so the spec sheet is honest. Both are well within the 0.35–0.45mm range typical of residential aluminum soffit.
In-stock SKUs ship in 3–5 business days from Michigan. Out-of-stock or larger-than-warehouse-quantity orders ship 40–45 days after the PO lands, which is standard container lead time from origin. We'll confirm the schedule on every quote.
Warranty & Care Guide
Shoreline Brands stands behind every product we manufacture.
Our building materials carry a limited warranty against manufacturing defect. Specific terms — duration, exclusions, and coverage tier — vary by product and by manufacturing partner. Contact us for product-specific warranty documentation before specifying for a project that requires written warranty terms.
Painted aluminum trim coil is warrantied against checking, peeling, and chalking under normal residential exposure. Specific warranty period varies by SKU.
Warranty Coverage
- Manufacturing defects
- Material substitution
- Painted-finish checking and peeling under normal residential exposure
Warranty Exclusions
- Damage from improper installation or out-of-spec fasteners
- Cosmetic surface damage incurred after delivery
- Performance claims requiring third-party testing (ASTM, UL, etc.) — these are not currently warranted on our building-materials line
Care Guide
Storage Before Install
- •Store trim coil and flashing flat, off the ground, under cover. Bowed coil resists straightening once it's taken a set.
- •Keep underlayment and ice-and-water shield rolls on end (not laid flat) to prevent core distortion.
- •Coil nails: keep in original cartons, indoors, until install. Field-stored cartons soak humidity and corrode prematurely.
Field Cuts and Edges
- •Cut aluminum with aviation snips or a fine-tooth blade. Don't use abrasive cut-off wheels — heat discolors the paint at the cut.
- •Cut galvanized steel with snips; seal the cut edge with zinc-rich primer in high-moisture exposure to prevent edge rust.
- •Touch up scratches or scuffs on painted aluminum with matching color-matched paint before exposure to weather.