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Westlake Royal Roofing Solutions

Westlake Royal · Unified Steel

Stone-coated steel in shake, shingle, and Spanish tile profiles.

Product line
Unified Steel® stone-coated steel roofing
Impact rating
Class 4 — the highest impact rating
Warranty
50-year limited, transferable
Profiles
Shake, shingle, high- and low-barrel tile
Westlake Royal · Unified Steel

Background

Westlake Royal Roofing Solutions makes Unified Steel® stone-coated steel roofing: steel panels pressed into shake, shingle, and Spanish tile profiles and coated with stone granules. The result looks like a traditional roof and behaves like a metal one.

The appeal is durability per pound. The panels are far lighter than clay or concrete tile, Class 4 impact rated against hail, and backed by a 50-year limited warranty. Steel does not rot, it does not feed moss the way wood does, and the stone coating is color that goes through the surface rather than paint that sits on top of it.

We use Westlake Royal for stone-coated metal, full stop. Using one manufacturer's panels, battens, trim, and fasteners is what keeps the assembly's details, clearances, and warranty coherent — mixing brands is how a good roof becomes a disputable one.

The Assembly

How a stone-coated steel roof goes together

Panels are light, so the deck and the underlayment do the heavy lifting. Trim is where the system either holds or leaks.

  1. 1

    Roof deck

    Plywood or OSB substrate

    Solid deck, because the panels are light and the deck — not the structure — is usually the limiting factor.

  2. 2

    Underlayment

    Unified Steel-specified underlayment

    The waterproof layer under the panels, and for tile profiles the drainage plane as well.

  3. 3

    Battens

    Manufacturer battens

    Set course spacing and lift the panel off the underlayment so water can pass beneath.

  4. 4

    Panels

    Unified Steel panels

    Stone-coated steel panels fastened exactly on the manufacturer's nail line.

  5. 5

    Trim

    Hip, ridge, valley, eave, and sidewall trim

    Purpose-made trim that matches the panel profile so the roof reads as one continuous surface.

  6. 6

    Penetrations

    Profile-specific flashings and solar mounts

    Vents and mounts designed for the panel — on these roofs the mount is part of the waterproofing.

Components

What Westlake Royal Roofing Solutions covers on our roofs

Each product line below, what it does, and the parts that have to come with it for the assembly to hold together.

Stone-coated steel · High barrel

BARREL-VAULT Tile

A high-barrel Spanish tile profile for Mediterranean and Spanish-revival architecture — the profile most associated with a traditional clay tile roof, at a fraction of the weight.

Components

High-barrel panels
Stone-coated steel tile panels in a high barrel profile
Ridge and hip caps
Barrel caps that continue the profile over the ridge and hips
Eave closures
Close the open barrel ends at the eave
Valley trim
Metal valley sized for the profile

What matters

  • Reads as a barrel tile roof from the street and from above.
  • Light enough to install where clay or concrete tile would need structural reinforcement.
  • Eave closures are what make the barrel ends look finished — and keep birds and wind-driven rain out.
Stone coated metal

Stone-coated steel · Low barrel

PACIFIC Tile

A low-barrel tile profile: a flatter, more modern Spanish look with cleaner roof lines than the high barrel.

Components

Low-barrel panels
Stone-coated steel panels in a low barrel profile
Ridge and hip caps
Matching profile trim
Eave and sidewall trim
Closures and flashing matched to the panel

What matters

  • A quieter roofline than the high barrel, and often a better fit on contemporary homes.
  • Same panel construction and impact rating as the rest of the line.
  • Panel layout matters more on a low profile — short courses show more than on a high barrel.
Stone coated metal

Stone-coated steel · Shake

PINE-CREST Shake

A hand-split shake profile with deep shadow lines — the look of a cedar shake roof without the moss, splitting, or annual maintenance.

Components

Shake-profile panels
Deep-ribbed panels reproducing hand-split shake
Hip and ridge caps
Matching shake-profile caps
Sidewall and step flashing
Profile-specific flashing at wall junctions

What matters

  • Gives a wood-shake streetscape on a fire-resistant assembly — important in wildland-urban interface zones.
  • No moss treatment, no shake replacement, no gutter full of cedar debris.
  • Class 4 impact rating means hail generally dents nothing.
Stone coated metal

Stone-coated steel · Shingle

COTTAGE Shingle and GRANITE RIDGE

Architectural shingle profiles on a steel panel. This is the profile that blends into a shingle neighborhood most easily while still being a metal roof.

Components

Shingle-profile panels
Laminated-look steel panels
Ridge caps
Matching shingle-profile ridge
Starter and eave trim
Closure at the eave and a finished first course

What matters

  • The easiest stone-coated profile to specify in a shingle neighborhood or an HOA with style restrictions.
  • Panel joints are less visible than on shake profiles, so layout is more forgiving.
  • Same underlying panel system: stone coating over steel over underlayment.
Stone coated metal

Accessory

Solar and mounting on Unified Steel

Adding solar to a stone-coated steel roof uses mounts made for the panel profile, so the waterproofing stays a roofing detail rather than a bolted-on compromise.

Components

Profile-specific solar mounts
Mounts that attach to the panel structure without breaching the water plane
Flashing plates
Seal the mount penetration to the panel
Conduit and penetration flashings
Route conduit without creating a leak path

What matters

  • Mounting through the panel face is not how these roofs accept solar.
  • Plan the array with the panel layout so mounts land on the structure, not between battens.
  • A 50-year roof is the right time to plan solar — doing it in two passes costs more.
Solar roofing

Watch

Installation and product tutorials

Manufacturer and field footage of these products being installed, so you can see the details we are describing.

Westlake Royal Roofing

Unified Steel stone coated roofing overview

How stone-coated steel is made and what the shake, shingle, and tile profiles look like installed.

Westlake Royal / Unified Steel

How to install a stone coated steel roof

A job walkthrough of stone-coated steel panel installation, including panel layout, fastening, and hip and ridge trim.

Westlake Royal Roofing

Mounting solar on Unified Steel

Attaching solar mounts to a stone-coated steel roof without compromising the panel or the warranty.

Get Started

Building a Westlake Royal Roofing Solutions roof?

Request a free estimate and we will lay out which system fits your building, and what it includes.

Service Areas

Roofing & Waterproofing in San Francisco & San Mateo County

We provide roofing & waterproofing for residential and commercial properties in every city and community across San Francisco and the Peninsula south to Hillsdale in San Mateo. Select your area for local building conditions, exposure, and details.

Not sure whether we cover your address? View all service areas or contact us to confirm.