Use our block fill calculator to estimate the fill volume. Multiply this by the total number of blocks, and divide by 46,660 to get the total number of cubic yards needed. The volume of the core would therefore be: ![]() For a block is 8″ x 8″ x 16″, this would look like: The fastest way to get an accurate volume of the cells in the CMUs is to take the length and width of the block and subtract the shell and web measurements. Typical measurements for webs and shells may be around 1″ or 1.25″ depending on the size of the block. To calculate the fill volume, you will need the number of webs, their thickness, and the thickness of the shell. When looking at a block from the top down, the areas that run front to back on the block are called “webs”, while the areas that run side to side are called the “shell”. Estimating the concrete needed to fill the cells in concrete block involves getting more measurements from the blocks. Try our mortar calculator to calculate how many bags are needed.ĬMUs are hollow and designed to be filled with concrete during installation. Each formulation and brand may vary in how many blocks the mortar will bond. You can also purchase pre-mixed bags of mortar, which can come in different formulations. Once you have the number of bags, you will need one cubic yard of sand for every seven bags of cement. On average, it takes about three bags of cement for every 100 blocks.ĭivide the number of blocks being installed by 33.3 to calculate how many bags are needed. If you are planning on mixing your mortar yourself, you will need a yield of 1:3 cement to sand mixture. Mortar is a mixture of cement and sand, usually with other additives. Our calculator above may indicate a different quantity of blocks needed since it uses a more precise formula, accounting for partial blocks and cutoffs automatically.Ĭalculating the amount of mortar needed for the joints in a concrete block wall will vary depending on the mortar mix you use. We recommend adding 5%-10% additional blocks to account for broken blocks or blocks that need to be cut for the edges. So I learned.If you’re using a standard 16″ x 8″ x 8″ block, find the number of blocks needed by dividing the wall square footage by 0.89. I was just too fking cheap to higher a decorator. So I know a thing or two about retaining walls, building pools, landscaping and construction.Īs far as subing a custom home I could do it but would need quite a bit of help the first coupla times through.īTW U can call me Maurice as I even know interior design. The re bar in the pool was set 4 inches on center, required 55 yards of Gunite and was 18 inches thick. One side of the pool itself acted as a retaining wall. If I recall the footing alone required 35 yards of concrete. On my last house I built 30 ft of 6 ft high, 105 ft of 5 ft high and 240 ft of 3.5 ft high CB retaining wall. So what you are in a sense building is a wall made of cement.īuilding a retaining wall otherwise with CB is a disaster waiting to happen. Add rain and strike three.įor a roughly 3 foot high wall chances are you will need a PERMIT.which will tell you what size block, how deep and how wide your footing has to be, how much re bar, and that you have to fill all the block cells with concrete. The horizontal pressure and change in coefficient of friction in the soil is a double strike. Last thing you want is for water or moisture to build up behind a wall like that. ![]() ![]() One of the main advantages of using concrete landscape wall units is they are typically mortar free and self weeping. I suggest you focus your research in that direction. There are special interlocking Concrete landscape units designed for your application. Retaining walls are notorious for failure, even knee height ones. Bad idea, even using a rule of thumb 1:4 width to height ratio for a parapet you exceed anything reasonable going that narrow.
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