![]() ![]() Horizontal reinforcement is provided by metal reinforcement strips laid into the wet mortar after every third or fourth course of block. Vertical reinforcement is provided by lengths of steel rebar embedded in wet concrete that is poured into block cavities at prescribed intervals. The diameter and number of steel bars should be according to the design. Fastening the new steel bars with the dowels using steel wires. Installing dowels at 25-30cm spacing in both directions using an appropriate epoxy material. Freestanding block walls can be subject to stresses that can crack joints and destroy walls, so both vertical and horizontal reinforcement is common. Cleaning and roughening the concrete surface. For greatest strength, most concrete block walls are assembled so the vertical joints are offset (staggered) from one course to the next. The top of the stem wall should be 5 inches above ground level minimum, which makes a 4 inch gap from the ground to the bottom of the siding when using a 1 inch siding overhang. More footing dimensions: Footing thickness - 8 to 12 inches Footing depth - varies based on frost line and soil strength (some footings can be shallow, while other must be deep) Concrete Calculator - Figure out how much concrete youll need for your footings. Attach the shed walls to the stem wall with j-bolts embedded in the concrete 12 inches off each corner then 48 inches on center. Each row of blocks is joined to the adjoining blocks with either type N (above grade) or type S (below grade) mortar. Source: Table 403.1 CABO One- and Two- Family Dwelling Code 1995. Most cement block walls will use several different types of blocks, especially stretchers and corner units. Block shapes and sizes are chosen to match the function of the wall and the configuration of the wall. Examples of foundation walls and enclosure walls that require openings. The depth and size of the foundation will vary depending on the size of the concrete block wall and the weight it must support, but a typical freestanding wall requires a foundation that is about twice as wide as the wall itself and which extends about 1 foot down below the frost line. All concrete block walls must rest on a sturdy foundation of poured concrete.
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