Comparing Rammed Earth Board Thickness: Which Option Suits Your Project?

In the world of modern architecture and interior design, materials that blend durability, sustainability, and visual appeal are worth their weight in gold. Enter rammed earth boards—a versatile, eco-friendly choice that's been gaining traction among designers, homeowners, and commercial builders alike. Part of MCM's innovative lineup, which includes everything from flexible stone to wood grain board, rammed earth boards stand out for their earthy textures, rich color palettes, and adaptability. But here's the thing: not all rammed earth boards are created equal. One of the most critical decisions you'll face when choosing them? Thickness. Whether you're eyeing a crisp white accent wall, a warm matcha green exterior, or a dynamic gradient finish, the right thickness can make or break your project's success. Let's dive into why thickness matters, explore the most common options, and help you figure out which one aligns with your vision.

Why Thickness Isn't Just a Number

At first glance, thickness might seem like a minor detail—after all, a board is a board, right? Wrong. The thickness of a rammed earth board impacts nearly every aspect of your project, from how it feels to how it performs. Let's break down the key reasons it matters:

Structural Integrity: Thicker boards generally mean more strength. If you're using rammed earth for high-traffic areas, exterior cladding, or even load-bearing applications, skimping on thickness could lead to cracks, warping, or premature wear.

Insulation & Acoustics: Thicker boards act as better insulators, helping regulate temperature and muffle sound. This is a big deal for spaces like home offices, bedrooms, or restaurants where comfort and privacy matter.

Weight & Installation: Thicker boards are heavier, which affects installation. You'll need sturdier mounting systems, and in some cases, structural reinforcement. Lighter boards, on the other hand, are easier to handle and can be installed on more delicate surfaces.

Aesthetics: Thickness subtlety influences texture and depth. A 10mm board might have a sleek, understated look, while a 25mm board can create bold, dramatic shadows and dimensionality—perfect for making a design statement.

Cost: Thicker boards use more materials, so they're often pricier. Balancing thickness with your budget ensures you're not overspending on features you don't need.

Now that we've covered the "why," let's get into the "what"—the most common rammed earth board thicknesses and when to use them.

Common Rammed Earth Board Thickness Options

Rammed earth boards come in a range of thicknesses, but 10mm, 15mm, 20mm, and 25mm+ are the most widely used. Each has its sweet spot, so let's unpack them one by one.

10mm: Lightweight and Flexible—Ideal for Interiors

If you're dreaming of a sleek accent wall, a cozy nook, or a statement piece in a low-traffic area, 10mm rammed earth boards might be your perfect match. These thin, lightweight panels are all about versatility and style, making them a favorite for interior designers.

Take rammed earth board (white) , for example. Its clean, minimalist finish pairs beautifully with modern decor, adding warmth without overwhelming the space. Imagine it in a home office: the soft, matte texture contrasts with sleek furniture, creating a calm environment that sparks focus. Or in a bathroom, where its moisture-resistant properties (when sealed properly) hold up against steam and humidity. Because 10mm boards are thin, they're also flexible enough to be installed on slightly curved surfaces—think arched doorways or rounded niches—adding subtle architectural interest.

Pros? They're easy to handle, require minimal structural support, and are budget-friendly. Cons? They're not built for heavy wear or exterior use. High-traffic areas like hallways or commercial lobbies might scratch or dent them over time, and exposure to rain, wind, or extreme temperatures could cause warping. Save 10mm boards for interiors where beauty and lightness take center stage.

15mm: The Versatile Workhorse—Indoor or Outdoor

If there's a "goldilocks" thickness for rammed earth boards, 15mm is it. Not too thin, not too thick—just right for a wide range of projects. Meet rammed earth board (middle) , the standard option that balances strength, weight, and cost. It's the go-to choice for designers who want flexibility without compromising on durability.

15mm boards shine indoors and out. Indoors, they're tough enough for busy family rooms, restaurants, or retail spaces. Picture a café with rammed earth board (matcha green) walls: the warm, earthy tone complements wooden tables and potted plants, creating a cozy, nature-inspired vibe that keeps customers coming back. Outdoors, they hold up to light rain, sun, and temperature fluctuations, making them great for patio walls, garden borders, or even exterior accent panels on homes. Unlike 10mm boards, 15mm panels have enough heft to resist dents from accidental bumps, and their added thickness provides better insulation—handy for rooms where temperature control matters, like bedrooms or living areas.

Installation is a breeze, too. They're light enough for two people to handle but sturdy enough to be mounted directly to wood or metal frames. And because they're widely available (including in popular colors like matcha green, beige, and earthy browns), you won't have trouble finding the perfect shade to match your design. Whether you're building a home, a boutique, or a community center, 15mm rammed earth boards offer the kind of versatility that makes them a designer favorite.

20mm: Durable and Dependable—Built for Exteriors

When your project demands something tougher—think exterior cladding, high-traffic commercial spaces, or areas exposed to the elements—20mm rammed earth boards step up to the plate. These thicker panels are built to last, with a robustness that makes them ideal for projects where durability is non-negotiable.

Let's talk about rammed earth board (matcha green) again, but this time in 20mm. Imagine it as the exterior facade of a modern home in a rainy climate. The added thickness acts as a barrier against moisture, preventing water from seeping into the walls, while the rich green hue blends with the surrounding landscape, creating a home that feels rooted in nature. Or in a busy airport lounge: 20mm boards can withstand the constant foot traffic, luggage bumps, and cleaning without showing signs of wear. They also offer better sound insulation, muffling the hum of announcements and chatter to create a more peaceful environment.

Pros? Exceptional durability, weather resistance, and sound/heat insulation. Cons? They're heavier than 10mm or 15mm boards, so you'll need stronger mounting systems—think metal brackets or reinforced drywall. They also cost a bit more, thanks to the extra material. But for projects where longevity matters, the investment is worth it.

25mm+: Heavy-Duty for Structural Projects and Bold Design

For projects that demand maximum strength or make a bold design statement, 25mm+ rammed earth boards are the way to go. These thick, substantial panels are built for structural support and high-impact aesthetics, often used in commercial buildings, outdoor installations, or custom homes where "wow factor" is key.

Take rammed earth board (gradient) , for example. Imagine a hotel facade wrapped in these panels: the color shifts from deep terracotta at the base to soft sand at the top, mimicking the way sunlight fades desert landscapes at dusk. The 25mm thickness ensures the panels can withstand strong winds and heavy rain, while the gradient finish turns the building into a work of art. Or in a public park, where 30mm rammed earth boards form benches and retaining walls—sturdy enough to hold up to years of use, yet warm and inviting enough to encourage people to linger.

These thick boards also shine in structural roles. Some 25mm+ rammed earth boards are reinforced with fibers or mesh, allowing them to act as load-bearing elements in small structures like garden pavilions or outdoor kitchens. Their mass provides excellent thermal mass, too—absorbing heat during the day and releasing it at night, helping regulate temperatures in passive design homes.

Of course, with great thickness comes great responsibility (and cost). These boards are heavy—you'll need professional installers and possibly structural engineering approval. They also require more material, driving up costs. But for projects that need to stand the test of time or make a memorable impression, 25mm+ boards deliver in spades.

How to Choose: Key Factors to Consider

Now that you know the basics of each thickness, how do you decide which one is right for your project? Here are the key factors to weigh:

Project Type: Residential projects often lean toward 10mm (accent walls) or 15mm (main walls), while commercial spaces might need 20mm (high traffic) or 25mm+ (exteriors). For example, a home kitchen backsplash could use 10mm white rammed earth, while a restaurant's exterior facade might need 20mm matcha green for durability.

Location: Climate plays a big role. If you live in a rainy area, 20mm+ boards with proper sealing are a must for exteriors. In dry, sunny regions, 15mm might suffice, as long as they're treated to resist UV rays. Indoors, climate is less of a factor, but humidity (like in bathrooms) might call for thicker, more moisture-resistant boards.

Design Goals: Do you want a subtle texture or a bold, dimensional look? Thinner boards have a sleeker profile, while thicker ones add depth. Rammed earth board (gradient) in 25mm, for instance, creates a dramatic, almost sculptural effect, while 10mm white boards blend into the background, letting other design elements shine.

Budget: Thicker boards cost more, both in materials and installation. If you're working with a tight budget, prioritize thicker boards for high-impact areas (like exteriors) and save thinner ones for less critical spaces (like a bedroom accent wall).

Installation Requirements: Check if your space can support the weight. Older homes with weak walls might not handle 25mm boards, while new builds with reinforced structures can accommodate heavier options. Always consult with a contractor or engineer to ensure safety.

Real-World Examples: Thickness in Action

Sometimes, seeing thickness in action helps clarify the choice. Let's look at a few real-world projects:

The Cozy Café: A small neighborhood café wanted to create a warm, inviting atmosphere. They chose 15mm rammed earth board (matcha green) for their main walls. The thickness holds up to daily cleaning and customer traffic, while the soft green hue pairs with wooden tables and potted herbs, making patrons feel like they're dining in a garden. The 15mm boards were easy to install over the existing drywall, keeping renovation costs low.

The Modern Home Exterior: A family building a home in a rainy coastal area opted for 20mm rammed earth boards in a gradient finish. The thickness withstands the constant sea breeze and rain, while the color shift (from deep blue at the bottom to pale sky at the top) mirrors the ocean and horizon. The boards' insulation properties also help keep the home warm in winter, reducing heating costs.

The Boutique Retail Store: A high-end clothing store wanted a minimalist, luxury feel. They used 10mm rammed earth board (white) for their fitting room walls. The thin, lightweight panels create a soft, cloud-like texture that makes customers feel pampered, while the white backdrop makes the clothing colors pop. Since fitting rooms see moderate traffic, the 10mm thickness holds up well.

Final Thoughts: Let Your Project Guide You

Choosing the right rammed earth board thickness isn't about picking the "best" option—it's about picking the one that fits your project's unique needs. Whether you're drawn to the lightness of 10mm, the versatility of 15mm, the durability of 20mm, or the drama of 25mm+, remember: thickness impacts everything from how your space feels to how long it lasts.

And don't forget to explore MCM's full range of options. Beyond rammed earth, their lineup includes MCM flexible stone , wood grain board, and fair-faced concrete, each offering unique textures and finishes to complement your design. Mix and match, experiment with colors, and let the material's natural beauty shine through.

At the end of the day, the best thickness is the one that turns your vision into reality—strong enough to last, beautiful enough to inspire, and perfectly suited to the space you're creating. So go ahead: measure twice, choose wisely, and watch your project come to life, one carefully selected board at a time.