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  1. retaining wall semma
  2. retaining wall blocks semma

Techo-Bloc Semma Retaining Wall Blocks

Semma is a 6″ x 16″ double-sided retaining wall block with tapered sides and a strong mechanical interlock for vertical or sloped walls. Its 4-core, gravel-filled system boosts stability, while a ½” bond disperses joints. With an integrated Coin on each layer, Techo Bloc Semma Retaining Wall Blocks are ideal for raised patios, parapets, and dramatic pillar finishes. Polished finish available only in Canada.

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30-Day Returns Guaranteed

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30-Day Returns Guaranteed

Reliable Shipping

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Techo-Bloc Semma Retaining Wall Blocks are designed for building sturdy garden walls, raised beds, and landscape borders. Their interlocking system makes installation straightforward and helps prevent shifting over time. These blocks are ideal for homeowners, landscapers, and contractors looking for a reliable way to manage slopes, create level planting areas, and add structure to outdoor spaces.

A 6″ x 16″ double-sided segmental retaining wall, with tapered sides and an independent mechanical interlock, allowing for a vertical or battered wall. Semma also has tremendous shear strength (block to block contact), void fill interlock (4 cored system with contractor gravel-filled cores), and a ½” bond for joint dispersion. Semma wall, with an integrated Coin on every layer, makes a great solution to the raised patio quandary: building a structural wall and topping it with a parapet (free-standing wall). Use the Semma pillars to finish or add drama or light features to your wall. Polished finish is only available in Canada. Semma is part of the dry cast collection.

Weight 57.9 lbs

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Segmental Retaining Wall Blocks FAQs

Standard gravity wall blocks like EP Henry Vertica, EP Henry Diamond Pro, and NewLine Regal Stone support unreinforced heights up to 4 feet (48 inches). Taller unreinforced heights can be achieved using oversized hollow-core systems like EP Henry Verti-Block (up to 14 feet) or half-ton blocks like Techo-Bloc Skyscraper. For standard blocks, consult a structural engineer for walls exceeding 4 feet.

Blocks rely on specialized connection methods. Systems like NewLine Regal Stone use an integral rear lip for automatic setback without extra parts. Pinned systems like NewLine COMPAC and Stonegate utilize fiberglass pins to align courses, while interlocking core units like Techo-Bloc Semma use a 4-core system filled with gravel alongside independent mechanical interlocks.

Near-vertical wall systems like EP Henry Vertica are built for tight spaces and steep slopes. Their near-vertical orientation allows you to retain soil efficiently without taking up excess yard footprint or encroaching on property boundaries.

Hollow-core blocks (such as Regal Stone Pro, Verti-Block, and COMPAC) are lighter to handle and deliver high surface-area coverage per unit. Filling the internal open cores with crushed stone aggregate increases shear strength, enhances drainage behind the wall face, and locks the courses together.

Single-sided blocks have one finished face and are cost-effective choices for walls backed against soil where only the front is visible. Double-sided blocks (such as Techo-Bloc Semma, Graphix, and Travertina Raw) feature finished textures on both sides, allowing a structural retaining wall to transition into a freestanding parapet or patio wall.

You can select modern 3D profiles like Techo-Bloc Graphix with varying depths and smooth-to-chiseled faces, contemporary sleek lines with Techo-Bloc Mini-Creta Architectural, or wet-cast options like Techo-Bloc Travertina Raw, which replicates natural travertine while offering superior durability in freeze-thaw climates.

Yes. Blocks with tapered sides or shortened tail designs (like COMPAC, Semma, and Vertica) allow you to build smooth inside and outside curves. Standard structural units generally accommodate a minimum inside or outside radius of 48 inches from the back of the block.

Segmental wall blocks come with reliable shipping and a 30-day return guarantee. Because heavy block units ship on commercial freight pallets, personalized shipping quotes are calculated by phone or direct request before finalizing your order.

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Visit our 5,000 square feet indoor hardscape materials showroom in New Holland, PA where you will find hardscape layouts, outdoor kitchen ideas, patio paver designs, patio lighting features, and our high-quality patio furniture all on display. Find the colors and textures that best complement your style, and a guide to help you choose the best combinations for your hardscape project in New Holland, PA. Here you will find hundreds of hardscape materials on display along with a full display of backyard and patio ideas.

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