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Legendary Masonry St Louis offers concrete and block masonry services for homeowners throughout St Louis, MO. We build CMU walls, foundations, garages, and structural partitions that are straight, plumb, and reinforced correctly. Our crew also repairs cracked or bowing block walls to restore strength and safety.
Legendary Masonry St. Louis provides professional block masonry throughout St Louis, MO, Missouri and the surrounding area. Our licensed, insured crew delivers safe, clean, on-time work with a free estimate before anything begins. Call 314-788-7849 or request your free quote.
Concrete and Block Masonry for St. Louis Homes and Businesses
Concrete and block masonry is the backbone of many St. Louis structures, from South City basements to commercial garages in the county. At Legendary Masonry St. Louis, we focus on practical, long‑lasting solutions that fit the way buildings are actually built here, not just in a textbook.
When we talk about block masonry, we usually mean concrete masonry units (CMU) that form walls, foundations, retaining walls, and structural support elements. These blocks can be solid or hollow, and they are chosen based on what the wall needs to do: hold back soil, carry upper floors, or simply divide interior spaces. In many older St. Louis neighborhoods, a new block wall has to tie into existing brick, limestone, or rubble foundations, so our work typically combines modern CMU with older materials.
Concrete comes into play as footings, slabs, piers, and bond beams that support and lock the blockwork together. The quality of this underlying concrete work is what keeps walls from cracking or settling later. Our crew evaluates your specific structure, the soil conditions on site, and how the wall will be used so we can match the right mix design, reinforcement, and block size to your project rather than using the same approach every time.
How We Build a Durable Block Masonry Wall
A typical block masonry project in St. Louis follows a clear sequence so you know what will be happening on your property and why each step matters.
First, we inspect the site and existing structure. For example, if we are adding a new block foundation wall to a 1920s brick home, we check the current footing depth, look for past settlement, and locate any old coal chutes or window wells that might affect the new work. This inspection helps us confirm wall thickness, reinforcement spacing, and footing size.
Next comes layout and excavation. We mark the wall line with string and stakes, verify property lines if the wall is near a neighbor, then excavate to the depth required by local frost and code requirements. In St. Louis, that usually means at least 30 inches below grade for foundations, sometimes deeper for heavy loads or weak soil. We compact the bottom of the trench so the new concrete footing will sit on stable ground.
We then form and pour the concrete footing. Steel rebar is installed in the forms according to the wall design, often with vertical bars hooked and left projecting so they can tie into the block cores later. Once the concrete is poured, we allow proper curing time so the footing gains enough strength before we start stacking any block.
After the footing cures, we snap chalk lines on the footing, then start laying block on a full mortar bed. We stagger joints in a running bond pattern, check level and plumb constantly, and clean mortar out of the cores that will receive vertical rebar. As we go, we install rebar in the hollow cores and fill those specific cells with grout to create vertical columns inside the wall. For retaining walls or higher load areas, we may also install horizontal bond beams, which are special blocks with rebar that are grouted solid to act like concrete beams inside the wall.
The wall is finished with control joints at planned locations to manage thermal and shrinkage movement, then capped or parged depending on whether it will be left exposed, painted, or hidden behind finishes.
Concrete and Block Options That Make Sense in St. Louis
Legendary Masonry St. Louis offers a variety of practical options so your concrete and block masonry fits how you use your property and the way our local climate behaves.
For block types, customers typically choose standard gray CMU for structural work, but we can also use split‑face block for an attractive textured finish on visible retaining walls or commercial facades. In some city neighborhoods where the existing home is full brick, we often build a structural block wall and then add a brick veneer, which gives you the look of original brick while relying on the strength and cost efficiency of block behind it.
Concrete choices matter too. For exterior slabs, garage floors, and approaches, we often use air‑entrained concrete that handles winter freeze‑thaw better and we specify proper thickness and reinforcement so it holds up under vehicle loads. In older St. Louis basements with low ceilings, we may pour thinner interior pads over existing subgrade but add fiber reinforcement and control joints to minimize cracking while avoiding costly excavation.
We also offer drainage and waterproofing touches that pair well with block masonry here. That might mean adding a perforated drain tile system behind a new retaining wall in a hilly part of south or west county, or applying waterproof coatings to new block foundation walls in areas that are known for damp basements. These options are discussed with you up front, with clear costs, so you understand what is necessary, what is recommended, and what is simply optional based on your budget and risk tolerance.
Common Block Masonry Problems in St. Louis and How We Fix Them
Homes and buildings in St. Louis show predictable patterns of block masonry issues because of our clay soils, older construction styles, and weather swings. Knowing these patterns helps Legendary Masonry St. Louis design repairs that last instead of quick fixes.
One frequent problem is stair‑step cracking or horizontal cracking in block foundation walls. This often occurs when clay soil expands and puts lateral pressure on the wall, especially on homes built in the mid‑1900s with partial or full block basements. Our approach might involve excavating the exterior, relieving soil pressure, adding or improving drainage, and then reinforcing the wall from the inside with vertical and horizontal reinforcement, carbon fiber straps, or in extreme cases, partial or full wall rebuilds with thicker block and more rebar.
Another issue is deteriorated mortar joints and spalling block where moisture has entered unprotected walls. This is common on older garage walls, garden walls, and basement stairwells that have never been waterproofed. We grind out loose mortar, repoint with a compatible mortar mix, replace severely damaged blocks, and add surface protection such as a breathable masonry coating. Where moisture is driven by poor grading or downspouts, we recommend and can often help implement basic site drainage corrections.
We also see problems where new block work was simply not tied correctly into existing structures. In those cases, we may open small sections of wall, install proper anchors or dowels into the original foundation or brick, and rebuild the transitions so the old and new move together rather than pulling apart. Throughout any repair, we explain the root cause first so you are not paying to treat only the symptom.
What Affects Cost for Concrete and Block Masonry Projects
Block masonry costs in St. Louis vary based on a handful of very practical factors that we walk through with you before work begins so there are no surprises.
Access and site conditions matter a lot. A straight, open driveway that allows us to get a concrete truck close to the work area is less expensive than a tight city lot where everything must be wheeled in by hand or pumped from the street. If excavation is involved, depth, soil type, and the presence of rock or old buried debris will change the labor and disposal costs.
Wall type and reinforcement also drive price. A simple, non‑load‑bearing garden wall built from standard block with minimal reinforcement will be on the lower end. A tall retaining wall, a structural foundation wall supporting upper floors, or a garage addition with integrated piers will require heavier rebar, grout filling, thicker footings, and possibly engineered drawings, which all increase cost but also add long term stability.
Finish choices play a role too. Leaving a block wall natural and painting it later is less expensive than applying a decorative split‑face finish, brick veneer, or stucco. Adding waterproofing membranes, drain tile, sump pit connections, or interior insulation will add to the total but may save money over time by preventing water damage or energy loss.
Finally, project timing can influence cost. Coordinating block masonry with other trades, such as framers or plumbers, can sometimes reduce extra trips and setup time. When we prepare your estimate, we break these elements out clearly so you understand what each part costs and where you might adjust the scope to fit your budget without sacrificing structural integrity.
Why Work With Legendary Masonry St. Louis for Block Masonry
Choosing a masonry contractor in St. Louis is not just about price per block. It is about whether the crew understands how our housing stock and soil conditions behave over time, and whether they are willing to explain the plan before they start. Legendary Masonry St. Louis takes the time to show you where the new concrete and block masonry will sit, how it will be reinforced, and how it will connect to what you already have.
We are familiar with everything from 100 year old brick basements in the city to newer slab‑on‑grade homes in the suburbs, and we adjust our methods accordingly. That might mean using a softer mortar mix where new block meets old brick, adding extra lateral bracing in known problem soil areas, or working around tight alley access when replacing a block garage.
Communication is central to how we work. Before any demolition or pouring begins, you will know when equipment will arrive, how long each phase is expected to take, and what areas will be temporarily out of service. During the project, we keep you updated on what we find behind walls or below grade, and we discuss any recommended changes before they are made.
If you are considering a new foundation wall, a retaining wall, a block garage, or repairs to an existing block structure anywhere in the St. Louis area, we can inspect the site, walk you through practical options, and provide a detailed written proposal. Our goal is straightforward: concrete and block masonry that feels like a solid, worry free part of your property for decades.
