About Castohn Mountain Slate 12″ × 48″ Paver

Castohn Mountain Slate 12″ × 48″ is a large-format wet-cast concrete paver designed to deliver the texture and visual character of natural slate in a long, narrow architectural format.

The 12″ × 48″ shape creates strong linear movement and works particularly well in:

• Modern patios
• Long walkways
• Pool decks
• Courtyards
• Contemporary outdoor living spaces
• Linear landscape designs

Castohn’s Mountain Slate collection features an authentic natural slate texture, consistent 2-1/2″ thickness, eased edges, and slight color variation intended to create a more natural finished appearance.

Outdoor Warehouse Supply offers the Castohn Mountain Slate 12″ × 48″ paver as a special-order product.

What Is Castohn Mountain Slate?

Castohn Mountain Slate is part of Castohn’s large-format wet-cast paving collection.

Rather than looking like a basic smooth concrete slab, Mountain Slate is molded to create a more realistic stone appearance with:

• Slate-inspired texture
• Surface depth
• Eased edges
• Natural-looking tonal variation
• Large architectural dimensions

Castohn specifically describes the collection as having authentic natural slate texture and accurate, consistent dimensions.

What Does Wet-Cast Concrete Mean?

Wet-cast concrete uses a more fluid concrete mixture poured into detailed molds.

This process allows the manufacturer to reproduce finer surface detail than many conventional machine-pressed concrete products.

Castohn notes that wet-cast production helps replicate natural textures and details while allowing colors to blend more naturally.

Why Choose a 12″ × 48″ Paver?

The 12″ × 48″ size has a distinctive 1:4 proportion.

That long, narrow shape creates a strong linear appearance and can visually direct the eye through a landscape.

It works particularly well for:

• Long running patterns
• Contemporary patios
• Walkways
• Pool surrounds
• Courtyards
• Architectural accent bands

How Much Area Does One 12″ × 48″ Paver Cover?

A 12″ × 48″ paver measures:

1 ft. × 4 ft.

So each unit covers approximately:

4 square feet of nominal surface area

before accounting for joints.

How Many 12″ × 48″ Pavers Do I Need?

A simple estimating formula is:

Project square footage ÷ 4 = approximate number of pavers

For example:

Always allow additional material for:

• Cuts
• Breakage
• Pattern transitions
• Borders
• Future replacement

Because this material is special order, ordering enough for the full project initially is especially important.

How Thick Is Mountain Slate?

Castohn lists the Mountain Slate collection at a consistent:

2-1/2″ thickness.

This helps maintain predictable finished elevations across the installation.

Why Use a Long Linear Paver?

A long rectangular paver can dramatically change the visual character of a hardscape.

The 12″ × 48″ shape can:

• Make spaces appear longer
• Create directional movement
• Reduce visual clutter
• Produce contemporary linear patterns
• Contrast effectively with square pavers

It is especially useful when designers want the paving pattern itself to become part of the architecture.

Mountain Slate 12″ × 48″ for Patios

The 12″ × 48″ size can create a distinctive patio surface.

Possible layouts include:

• Running bond
• Staggered courses
• Linear patterns
• Alternating orientation
• Mixed-size designs

The slate texture helps soften the long geometric lines and maintain a natural appearance.

Mountain Slate for Walkways

This size is particularly well suited to walkways.

Its 48″ length can visually emphasize the direction of travel when installed lengthwise.

It can also be turned across a path to create broad horizontal bands.

Mountain Slate for Courtyards

Courtyards can benefit from the elongated proportions of this paver.

The format works especially well alongside:

• Outdoor kitchens
• Fire features
• Seating areas
• Garden walls
• Large planters
• Water features

Mountain Slate for Pool Decks

Mountain Slate may be used in compatible pedestrian pool-deck installations.

The 12″ × 48″ shape can create long clean lines around:

• Pools
• Spas
• Pool houses
• Outdoor kitchens
• Covered patios

Pool installations should still account for:

• Drainage
• Finished slope
• Slip considerations
• Coping transitions
• Joint material

What Does Mountain Slate Look Like?

Castohn describes Mountain Slate as having an authentic natural slate texture.

Customers should expect:

• Stone-like surface detail
• Subtle relief
• Slight tonal variation
• A less manufactured-looking finish than smooth concrete slabs

Does Mountain Slate Have Sharp Edges?

No.

Castohn lists eased edges as a feature of the Mountain Slate collection.

This helps soften the slab visually and contributes to its natural-stone-inspired appearance.

Are All Mountain Slate Pavers Identical?

No.

Castohn notes that slight color variation is intentional and helps create a more natural appearance.

Customers should expect some variation from piece to piece.

What Colors Are Available?

Castohn’s current South-region Mountain Slate collection lists:

• Graphite
• Chocolate
• Pearl
• Southern Buff

Because OWS offers this product by special order, current manufacturer availability should be confirmed before ordering.

Graphite Mountain Slate

Graphite provides a darker gray appearance.

It pairs especially well with:

• Modern architecture
• Charcoal hardscapes
• Black steel edging
• Gray retaining walls
• Contemporary planting designs

Chocolate Mountain Slate

Chocolate provides a warmer brown appearance.

It complements:

• Brown natural stone
• Warm brick
• Rustic architecture
• Earth-tone landscapes

Pearl Mountain Slate

Pearl provides a lighter neutral appearance.

It works well with:

• White limestone
• Cream masonry
• Light stucco
• Bright contemporary designs

Southern Buff Mountain Slate

Southern Buff provides warm tan and buff coloration.

It coordinates well with:

• Texas limestone
• Cream stone
• Warm masonry
• Traditional North Texas homes

Is Mountain Slate Natural Stone?

No.

Castohn Mountain Slate is a manufactured wet-cast concrete paver designed to reproduce the look and texture of natural slate.

This provides more predictable:

• Thickness
• Dimensions
• Layout
• Installation elevations

than many natural stone paving materials.

Mountain Slate vs. Natural Slate

Mountain Slate vs. Standard Concrete Pavers

12″ × 48″ vs. 24″ × 24″ Mountain Slate

Both sizes provide approximately 4 sq. ft. of nominal surface area, but they create very different looks.

This makes them useful together in mixed-size architectural layouts.

Why Is Base Preparation Important?

The long 48″ dimension makes even support particularly important.

If the base contains:

• High spots
• Low spots
• Voids
• Poorly compacted areas

the paver may not receive uniform support.

That can contribute to:

• Rocking
• Settlement
• Uneven joints
• Cracking

How Should the Base Be Prepared?

A typical pedestrian hardscape installation may include:

1. Excavation
2. Properly compacted subgrade
3. Compacted aggregate base
4. Uniform bedding layer
5. Careful paver placement
6. Proper edge restraint
7. Compatible joint material
8. Final adjustment and inspection

Always follow Castohn’s current large-format installation guidance.

Can Mountain Slate Be Installed Over Concrete?

Potentially.

A compatible overlay or mortar-set installation may be possible depending on Castohn’s recommendations and the existing concrete condition.

The underlying slab should be evaluated for:

• Cracking
• Drainage
• Slope
• Structural stability

Does Mountain Slate Need Edge Restraint?

For flexible-base installations, proper edge restraint is generally important.

Possible restraint systems include:

• Paver edging
• Concrete edging
• Steel edging
• Structural borders

Edge restraint helps keep perimeter units from shifting outward.

What Joint Material Should Be Used?

The jointing material depends on:

• Actual joint width
• Joint depth
• Installation system
• Base configuration

Polymeric joint material may be appropriate when all manufacturer specifications are met.

Can Gator Maxx G2 Be Used?

Potentially.

Alliance Gator Maxx G2 can be appropriate for compatible paver joints provided the actual joint width, depth, and installation system meet Alliance’s requirements.

The joint dimensions should be verified after layout rather than assumed solely from the slab size.

Can Mountain Slate Be Cut?

Yes.

Wet-cast concrete slabs can be cut around:

• Borders
• Corners
• Structures
• Drains
• Custom layouts

Because this piece is 48″ long and 2-1/2″ thick, suitable masonry-cutting equipment should be used.

Proper silica-dust controls and PPE are important.

Is the 12″ × 48″ Paver Heavy?

Yes.

Although only 12″ wide, it is a 4-foot-long, 2-1/2″-thick wet-cast concrete slab.

It should not be treated like a lightweight conventional paver.

Customers and installers should plan appropriate:

• Lifting techniques
• Crew size
• Material handling
• Jobsite access

OWS should confirm the current production weight before publishing an exact per-piece figure.

Is the 12″ × 48″ Easier to Handle Than Larger Mountain Slate Slabs?

Its narrower width may make certain handling situations easier than a 24″ × 48″ or 36″ × 36″ slab.

However, its 48″ length still requires careful handling to keep the piece properly supported.

Is Mountain Slate Good for DIY Projects?

Experienced DIY customers may be able to install smaller areas, but large-format pavers require careful base preparation and handling.

Professional installation may be preferable for:

• Large patios
• Pool decks
• Complex patterns
• Projects involving many cuts

Can Mountain Slate Be Used on Driveways?

I would not market the 12″ × 48″ Mountain Slate as a driveway paver without confirmation from Castohn for the specific vehicular installation system.

OWS should primarily position it for pedestrian hardscapes such as:

• Patios
• Walkways
• Pool decks
• Courtyards

Can Mountain Slate Be Sealed?

Yes.

A compatible wet-cast concrete sealer can be considered for:

• Stain resistance
• Easier cleaning
• Color enhancement

Sealants may change the paver’s color or sheen, so a small test area is recommended first.

How Should Mountain Slate Be Cleaned?

Routine maintenance generally includes:

• Sweeping
• Removing organic debris
• Cleaning spills promptly
• Using cleaners compatible with wet-cast concrete

Avoid harsh or unapproved chemicals that could affect the finish.

Can Efflorescence Occur?

Yes.

Like other cement-based materials, Mountain Slate can occasionally show light mineral deposits known as efflorescence.

This is primarily an appearance condition rather than a structural defect.

Is Castohn Mountain Slate 12″ × 48″ In Stock at OWS?

No.

Outdoor Warehouse Supply offers the Castohn Mountain Slate 12″ × 48″ paver as a special-order product.

How Do Special Orders Work?

Customers should provide our sales staff with:

• Desired color
• Approximate project square footage
• Quantity required
• Project timeline

OWS can then confirm:

• Current manufacturer availability
• Order requirements
• Lead time
• Pricing
• Pickup or delivery options

Castohn currently identifies OWS as a dealer serving commercial and retail hardscape customers in the Dallas–Fort Worth market.

Why Should the Entire Project Be Ordered Together?

Castohn specifically notes that color variation can occur.

Ordering the full project together can help reduce the risk of visibly different manufacturing lots.

It also reduces the chance of needing to wait for another special order because the product is not routinely stocked at OWS.

Can Special-Order Material Be Returned?

Special-order policies may differ from normal stocked products.

Customers should verify OWS’s current special-order terms before placing the order.

Pros & Cons of Castohn Mountain Slate 12″ × 48″

Castohn Mountain Slate 12″ × 48″ Pavers in Dallas–Fort Worth

Castohn Mountain Slate 12″ × 48″ pavers are an excellent option for Dallas–Fort Worth projects that call for a long, linear concrete paving slab with realistic natural slate texture.

The 1′ × 4′ dimensions make this size especially effective for:

• Contemporary patios
• Long walkways
• Courtyards
• Pool decks
• Architectural outdoor spaces
• Mixed-format paving patterns

Castohn’s wet-cast Mountain Slate collection provides authentic slate texture, consistent 2-1/2″ thickness, eased edges, and intentional slight color variation.

Outdoor Warehouse Supply offers the Castohn Mountain Slate 12″ × 48″ paver by special order through our Plano and Lewisville locations.

Industry Contractor & Wholesale Pricing

Outdoor Warehouse Supply offers industry contractor and wholesale pricing for qualifying landscape contractors, hardscape installers, pool contractors, builders, designers, commercial landscapers, and other industry buyers.

Contractors can source Castohn Mountain Slate alongside base materials, Concrete Sand, polymeric joint materials, steel edging, wall products, and natural stone through OWS.

Contact our Plano or Lewisville sales staff for current color availability, special-order quantities, pricing, lead times, and delivery options.

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Frequently Asked Questions

What is Castohn Mountain Slate 12″ × 48″?

It is a long-format wet-cast concrete paver designed to replicate the texture and appearance of natural slate.

How big is the 12″ × 48″ paver?

Approximately:

12 inches × 48 inches

or:

1 foot × 4 feet

How thick is it?

Castohn lists Mountain Slate at a consistent 2-1/2″ thickness.

How many square feet does one paver cover?

Approximately 4 square feet of nominal surface area.

Is Mountain Slate real slate?

No.

It is wet-cast concrete designed to recreate a natural slate appearance.

What colors are available?

Castohn’s current South-region Mountain Slate colors are:

• Graphite
• Chocolate
• Pearl
• Southern Buff

Does the color vary between pieces?

Yes.

Castohn specifically notes slight color variation as part of the natural appearance.

Are the edges sharp?

No.

Mountain Slate features eased edges.

Is the 12″ × 48″ size good for patios?

Yes.

It works particularly well in long linear or contemporary patio patterns.

Can it be used for walkways?

Yes.

Its long rectangular shape makes it especially useful for directional walkway designs.

Can it be used in courtyards?

Yes.

Can it be used around pools?

Yes, in compatible pedestrian pool-deck installations.

How many 12″ × 48″ pavers do I need for 80 square feet?

Approximately 20 pavers before waste.

How many do I need for 200 square feet?

Approximately 50 pavers before waste.

Should I order extra material?

Yes.

Allow additional material for cuts, breakage, pattern layout, and future replacement.

Does Mountain Slate need a compacted base?

Yes for typical flexible-base installations.

Why is a flat base important with the 48″ length?

The longer slab needs even support across its entire underside to reduce rocking, settlement, and concentrated stress.

Can Mountain Slate be installed over concrete?

Potentially, when the existing concrete and installation method meet manufacturer requirements.

Does it need edge restraint?

Most flexible-base installations should use proper perimeter restraint.

Can polymeric sand be used?

Potentially yes, when the selected product matches the actual joint width, depth, and base configuration.

Can Gator Maxx G2 be used?

Potentially, provided the installation satisfies Alliance Gator’s requirements.

Can Mountain Slate be cut?

Yes.

Use appropriate masonry-cutting equipment and silica-dust protection.

Is the 12″ × 48″ paver heavy?

Yes.

It is a four-foot-long wet-cast concrete slab and should be handled appropriately.

Is it easier to handle than the 24″ × 48″ size?

The narrower width may make it somewhat easier to maneuver, but its 48″ length still requires careful support during handling.

Can it be used on driveways?

OWS should not advertise it for vehicle loading unless Castohn approves the specific installation system.

Can Mountain Slate be sealed?

Yes, with a compatible wet-cast concrete sealer.

Can efflorescence occur?

Yes.

Temporary mineral deposits can occur on cement-based concrete products.

Is the 12″ × 48″ Mountain Slate stocked at OWS?

No.

It is a special-order product.

Can OWS special order it?

Yes.

Contact our Plano or Lewisville sales team for current availability, colors, quantities, pricing, and lead times.

Should I order the entire project at once?

Yes when practical.

That helps reduce production-lot variation and ensures sufficient material is available.

Is Castohn Mountain Slate 12″ × 48″ available in Dallas–Fort Worth?

Yes, by special order through Outdoor Warehouse Supply.