84 m; grid. concrete is good in compression but not tension. (Imagine you are walking around the slab) Hit Undo Last to Undo last side. 4" is plenty, be sure the base is good - compacted, free draining, etc use a relatively tight mix, ie low water to cement ration, slump in the 3 to 3. With rebar this thick, a four-inch slab will be more durable and last longer. Main bar is also called as shortest span bar usually used at bottom of slab having spacing 4 inch between the two bar. The grade shall be as specified by the. The rated separation for two-family dwellings is 1 hour whether or not a lot line exists between units. 1. 4 bar at 48 inches (1220 mm) on center horizontally grouted in place. If shear reinforcement is required for in-plane strength, s shall not exceed the smallest of 3h, 18 inches, l w /3. Acorn International 2. It will be different from the concrete right next to it. A 4 – inch -thick slab cast on the ground and in permanent contact with it will float and rebar is not required. 25" 3,000 PSI / 28 Day Aging #6 Rebar: 12 in: D2-10 Models: 4. 2. but dig the edges deeper like a footer and use normal rebar spacing for the footer. Lay the rebar every 24 inches in both directions inside the form for the patio slab. 6 bars and bigger – 2 inches. Rebar is recommended on concrete measuring 5 – 6 inches thick. For one layer of 6x6 W1. It’s crucial to ensure that welded wire mesh be placed on chairs of the proper height. And rebar is sized by eights of an inch. That is about a #4 bar at 10 inches on center. I was thinking of the following: basement wall 8 inches thick 10 feet high backfilled up to 7 to 8 feet. Anchor bolts are located a minimum of 15 anchor diameters from the edge of the concrete perpendicular to the length of the wood sill plate. For flat slabs like driveways, a grid spacing of 18 inches is recommended, with the edge rebar placed at the same distance from each side. Does a 4-inch slab need rebar? By: Olin Wade (Remodel or Move Stuff) Watch This Video To Learn More About Using or Not Using Rebar For Concrete Driveway Watch on It. Wilkerson, PE. If rebar is used what should the spacing and size be?What size rebar do I need for a 6 inch slab? The size of rebar that you need for a 6 inch slab depends on a variety of factors including the type of construction and the specific design of your structure. (Video) Rebar Spacing, Made Easy (DesignBuildDoug). (This convention begins to break down for bar diameters above #8. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. Do you need rebar for 4 inch slab driveway? It depends. Minimum sub-base (stone) under slab shall be 4 inches for both Table 1 and Table 2. Acorn International 2. 25" 3,000 PSI / 28 Day Aging #6 Rebar: 12 in: D2-10 Models: 4. 60 per square foot. To reinforce a 4” concrete slab or driveway with steel rebar, determine the grid spacing and rebar size – #3 or #4 in a 12” to 18” grid. 2. To calculate the amount of rebar per square foot, you will need to convert the 6 foot length to a linear foot, and the 50 pounds to pounds per linear foot. Concrete strength also comes into play, but most slab concrete is around 3000 to 4000 psi, so it's not a major factor. surface. The concrete contractors said that these rebar chairs were a great idea, but the execution and labeling of the product was very poorly thought out. Minimum reinforcement is 0. Anchorage shall be in accordance with Section R403. The 2021 IRC® contains many important changes such as: Braced wall lines must be placed on a physical wall or placed between multiple walls. Rebar Spacing; D2-8F: 4. Vertical rebar every 16 inches. 4500lb mix with 4-5% air entrainment. 7 mm). Leave a few inches of space between the mesh and the edges of the forms to prevent rust. This translates to roughly 5/8 inch rebar and must be spaced equally along the slab to create a proper grid. Place concrete at a minimum thickness of 4 inches. Anchor bolts are located a minimum of 15 anchor diameters from the edge of the concrete perpendicular to the length of the wood sill plate. A concrete slab costs between $4. 4. Number of cubic yards = 64 cubic feet ÷ 27. into an existing footer with a min. 5. 3a, for two-way slabs without interior column. Never put a shop on a slab less than 6" thick. Generally, you do not need rebar for a 4-inch slab. Nathaniel P. Second level 6 inches thick 9 feet tall. If the slab is expected to bear heavier loads, such as from heavy vehicles, then larger diameter rebar or closer spacing may be required. Have a helper add or remove concrete in. surface. For patios, a grid spacing of 24 inches is. Fiber and welded wire are only used for shrinks cracks, non structure cracks, cosmetic cracks. I will drill with a hammer drill and a 3/8 bit through the expansion material and into the existing slab about 6 inches. However, the stone has been compacted to the top of the rails, which corresponds to only 2. Prices for your concrete slab will vary significantly depending on many factors, including the slab’s thickness, concrete type, and size. 1. Finally, reinforcing mesh can replace bars if needed, but it must be spaced according to manufacturer’s guidelines. 1R-89, "Guide for Concrete Floor and Slab Construction," ACI Committee 302 does not recommend keyed joints for slabs thinner than 6 inches, and also doesn't provide guidance for dowels in slabs thinner than 5 inches. Per ACI 332. Most homeowners can expect to pay between $4. If the slab is 4 inches or less than it should not be reinforced. That means placing the wire on chairs to hold it at the correct height (see below). (ii) The maximum spacing between two secondary parallel bars shall be 5dor 450 mm or. 8" - 3/4" (top cover) - 2" (4-#4 bars) - 3" (bottom. Rebar size is first number - 4,5 or 6, second number, in inches, is vertical on center spacing 2. For example, if both slabs have rebar mats that are spaced at 18 inches and use No. #5 bars are 5/8”. 2. Tie in the Rebar to Strengthen the Slab. A six inch slab can handle some thin spots - a 4" slab can't. Main reinforcement which is based on the maximum bending moment shall not be less than 0. 10% reinforcing, the slab joint spacing should be the same as for an un-reinforced slab. The tensile strength of concrete is typically taken as 10 to 15% of the compressive strength, so only about 400 or 500 psi. For a patio you can use a grid spacing of 24 inches. “Reinforce the concrete with 6×6-10/10 wire mesh. For slabs 200 mm thick or greater the bar size and spacing should be limited to control the crack width and reference should be made to section 7. (as in example diagram) Multiply the 2. Stocked in half inch increments between 6. For example, a Grade 60 #8 rebar with a 1/2-inch center-to-center spacing and encased in 4 inches of 6,000 PSI concrete can hold approximately 59,000 PSI. Do you require gravel under concrete? The minimum spacing of rebar in slabs varies depending on the application, with typical spacing distances between 5 and 6 inches on center. Drive 12-in. Generally, rebar has an immense impact on concrete. Rebar is about 15x stronger than concrete in compression, and way more than that in tension. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the slab. Generally, concrete reinforcement mesh is available in a variety of sizes, including 6×6-inch, 8×8-inch, 10×10-inch, 12×12-inch and 14×14-inch. 37 cubic yards of concrete for a 4×4 slab that is 4 inches thick. Therefore, you will need approximately 2. #5 bars are 5/8”. For slab thicknesses 12 inches or less, the concrete cover tolerance is - 3/8 inch. For residential slab on grade applications, the minimum spacing of grade 60 #3 or #4 rebar is typically 4 inches on center. It create a bending of the slab. Why Rebar Spacing is Crucial. 33_6_0. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. For example, if the percentage is 0. Unique fastening system ensures accurate positioning of rebar, to code, during concrete placement. For example, a 4″ slab should have control joints placed a maximum of 12 feet apart. For example, if the engineer calls for rebar spaced every 4 inches, you need to place three bars for every 12 inches of the form. However, if the slab is subject to heavy load or if it’s used as a structural support, you may need to go larger, such as #6 (3/4-inch diameter) or even #7 (7/8-inch diameter). on 3 feet- 6 inch square area (office for some codes) CONCRETE MIX Top size of the coarse aggregate should not exceed 3/4inchor as dictated by applicable codes. Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is. These dowels could be straight or have a hook in the bottom and only need to be a minimum of 16 inches high above the finished concrete. Q: Can rebar rust in concrete? A: Rebar can rust in concrete if it is exposed due to cracking or delamination. It is essential to check local codes and regulations before starting any construction project. PROWORX 3-in x 60-in x 3-in Steel Slab Bolster. Most concrete slabs last 30–40 years and can last up to 100 years if properly installed and sealed. CRSI’s Reinforcement Anchorage and Splices includes tables of required lap splice lengths based on these variables. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12 mm and 16 mm. Reinforced slabs – where welded wire mesh or rebar is used to reinforce the slab. 0 inches use 4 inch Schedule 40 PVC duct and internal joining coupling for 4 inch I. PROWORX 3-in x 60-in x 3-in Steel Slab Bolster. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. Use a metal-cutting blade or disc in a reciprocating saw, circular saw or grinder to cut the rebar. In other words, for a 4-inch slab, space the joints 8 to 12 feet apart. Check for level on all sides. Rebar spacing in a slab footer will depend on the size of the slab, the load it will support, and local codes. You’re likely to pay between $1,800 and. The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required . A. Concrete subject to moderate or severe weathering as indicated in Table R301. This video series w. How big is a sheet of concrete mesh? Standard sheet sizes range from 4m (length) x 2m (width) 8m2 up to 6m (length) x 2. I poured a full 4. Rebar is recommended on concrete measuring 5 – 6 inches thick. 1 Type A - The dowel structure shall comprise a single metallic material meeting the requirements of AASHTO M 255M/M 255, AASHTO M 334, ASTM A276, ASTM A312, or ASTM A1035 (CS, CM and CL). 1. 4 mm) diameter wire at 10 inches (254 mm) on center vertically. In slabs with an average thickness of less than 6 inches, the spacing should be. 1. Slabs for hot tubs generally are 8 feet by 8 feet. Number 4 rebars spaced 12 inches on center (center-to-center distance) on both the top and bottom faces and in each way as well, i. Grade of steel;Size and spacing of the steel reinforcing; and. 46 and $1. The national average cost of a concrete slab is $6. Methods used for finding slab thickness varies for different types of slabs. 5 range tops, and control joints are formed either with preformed joint material or sawcut within the first 24 hours and be sure that the curing conditions are good, at least 50 F. There has been some research in recent years to look into this as a bridge deck with no rebar is a bridge. However, many engineers and contractors use a rule of thumb of keeping the rebar spacing to 2 – 3 times the. 12% for HYSD bars (Fe500) and 0. Generally speaking, when pouring a 6 inch slab, #4 or #5 rebar is used. The Engineer shows a 4″ Slab 3500psi with 6×6-W1. For exam-ple, for a one-way solid slab, with #5 temperature-shrinkage bars, high chairs are used at 4 feet on center; for #4 bars, high chairs would be placed 3 feet on center to prevent sagging. Generally, rebar spacing in slab footings ranges from 12 to 24 inches, both for horizontal and vertical bars. Rebar Spacing for Concrete Slab: What is the Correct Rebar Grid Spacing For Concrete Slab? The. 5. 33 inches. 4 inch of p r otection. This illustrates a common problem for the concre t e s u b c o n t ra c t o r : How do you place a l e v el slab of uniform thickness ove r steel beams that can va r y in eleva-MINIMUM VERTICAL REINFORCEMENT AND SPACING (INCHES) b, c: Soil classes and lateral soil load d (psf per foot below grade) GW, GP, SW and SP soils 30: GM, GC, SM, SM-SC and ML soils 45: SC, ML-CL and inorganic CL soils 60: 6 feet 8 inches: 4 feet (or less) #4 at 48 #4 at 48 #4 at 48: 5 feet #4 at 48 #4 at 48 #4 at 48: 6 feet 8 inches #4 at. You'll also need vertical rebar hooks protruding at least 6” into the footing and out at least 18” every 48”, or less. 0. Thick slabs Thick slabs are concrete slabs with an overall thickness of 4-6" or greater and can be either grade level (slab on grade) or below grade (i. That's 144 square inches. How long the concrete lasts. Rebar Spacing. So for example if you take a 6 inch slab times 2 is twelve feet or times 3 is 18. For 0. Concrete Slab Rebar Spacing Guideline. The ACI 318-19 provides a number of requirements regarding slab thickness, concrete cover, and reinforcement ratio which facilitate the design process. Concrete has great compression strength, but it can crack or br eak under. Suppose the foreman accidentally uses #3 bars instead of #4 at a 5 inch center-to-center spacing. Check for level on all sides. There are 27 cubic feet in a cubic yard of concrete, so divide the total cubic feet by. However, depending on the intended purpose of. 4m (width) 14. For example, let’s say the project requires a 4 inch thick slab, made of 6 foot rebar and a total of 50 pounds of rebar. 60 per square foot for materials and labor. However, there is no need to tie the garage slab to the new foundation, and in fact a strong case against doing so. Why Rebar Spacing is Crucial. 5 inches of thickness at the edge of the pool. 5 mm) for concrete slab depth ≤12 inch (304. The typical depth for rebar placement for slabs is 2-4 inches. 75-in 500-Pack Polypropylene Rebar Chair. 014/4 = 0. Set the forms at the proper height before bringing in the last lift. These dowels could be straight or have a hook in the bottom and only need to be a minimum of 16 inches high above the finished concrete. Wood sole plates at all exterior walls on monolithic slabs, wood sole plates of braced wall panels at building interiors on monolithic slabs and all wood sill plates shall be anchored to the foundation with minimum 1 / 2-inch-diameter (12. The national average cost of a concrete slab is $6. 34 inch (8. 7 mm) anchor bolts spaced a maximum of 6 feet (1829 mm) on center or approved anchors or anchor straps. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. I’d probably recommend good old fashioned #4 metal bar on a 2’ grid. For a slab this thin you would use wire mesh instead. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. 1. Table 3 contains the maximum number of bars that can fit in a single layer for various beam widths based on Grade 60 reinforcement, the overall reinforcing bar diameter, 1. 25" 3,000 PSI / 28 Day Aging #6 Rebar: 12 in:. 64 mm) between longitudinal rebar 2 and 3, which is the same as the rebar construction and traditional tape measurement results. 4. For a flat slab, such as a driveway, consider placing the rebar in an 18 inch grid spacing, keeping the edge rebar at the same distance from each side. 35 to $6. I am filling a 12 ft x 12 ft sunken lounge are with 12" of Geofoam as filler and a 4" concrete slab. 6. The string will act as a guide to keep the form boards straight. Generally speaking, a 4-inch slab of normal weight concrete (145-165 pounds per cubic foot) with a 28-day compressive strength of at least. (UBC), may require the use of rebar in 4-inch concrete slabs. How do you calculate rebar for a slab? Layout of Rebar for Concrete Slabs. If the slab is more than 24 inches thick, #5 (#5/8 inch diameter) rebar may be required. The top surface needs to remain wet while the curing process takes place. This means 2x 3/8 inch rebar makes 3/4 inch of steel. For a 4 inch slab, I really wouldn’t space the bars further apart than 12 inches. Our calculator will instantly calculate the quantity of rebar required. 1. Positioning a single layer of reinforcement in the center or at mid-depth of the slab is not recommended (except for 4-inch-thick slabs). For beams and walls, the spacing should be closer and is usually 3-4 inches apart. For garage slabs, two rows of #4 rebar are recommended around the perimeter, one above the other. MATERIALS The materials used to construct the dowel bar shall meet the following requirements: 4. Similarly, a 4 inch slab of 4,000 psi concrete, 4 feet by 8 feet, with reinforcing mesh can hold up to 45,000 lbs. anchor bolts and the 4 inches (102 mm) φ pipes. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. Figure 2 shows the minimum bar extensions given in ACI 318-14, Building Code Requirements for Structural Concrete and Commentary, Figure 8. The string will act as a guide to keep the form boards straight. The structural engineer specified 3/4-inch cover for the bottom bars and a 3/4-inch aggregate mix. For example, if you’re calculating rebar for a slab, input the slab dimensions, reinforcement spacing, and desired rebar size. Additional joints should be considered if the topping slab thickness mandates a closer spacing than the base slab to limit uncontrolled cracking. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. Suggested applications - concrete slabs, precast, tilt-up, bridge deck, and other heavy applications. a car weight about 5000lb. 440 2 2. 1. New concrete slabs must conform to the above stated properties before installation of. Thickening the structure along the perimeter by another will serve as an integral footing, adding strength where the loads are. The reinforcing steel sagged during placement between the support chairs, causing the 3/4-inch spacing to be infringed upon. For an unreinforced slab, control joints should be spaced in feet 2 to 3 times the slab thickness in inches. Find the number of concrete bags in the most popular sizes in the chart below: Bag Size. The grade shall be as specified by the. com First, enter the concrete slab sizes: length = 6 m, width = 4 m. Re: rebar dowel size and spacing. They are 4 feet in height and 10 inches in width (diameter), or 4' x 10". Reinforcing bars (rebars) are an important component of concrete slabs, because they reinforce the cement and increase its load-bearing capacity. The diameter size is given in eighths of an inch. This spacing will provide the maximum reinforcement of the. Come learn how you can build your own shed! In this video I cover all you need to know about rebar for your concrete shed foundation slab. A 12-foot two-by-four and an 8-foot two-by-four on each long side. Having installed thousands of slab on grade foundations over some 26 years as an ironworker, I can say that if it was my driveway, I would probably do 5 inch thick concrete with #4 rebar at 18 to 24 inches each way at center of slab in other words 2" chairs or dobies at every intersection and deepened perimeter footings. Anchors are located a minimum of 13/4 inches (45 mm) from the edge of the concrete parallel to the length of the track. 74 equals 1824 lbs per sq feet. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. a weak concrete has a compression. H2: #5 Rebar (5 rebar size) Diameter: 5/8 inch; Weight per Foot: 1. The insulation phase is crucial for a radiant floor. Minimum sub-base (stone) under slab shall be 4 inches for both Table 1 and Table 2. spacing reinforcing bars is through. vapor retarders - some times referred to as vapor barriers, insulation, etc. The exact spacing for the expansion joints is dependent on the size and design of the slab, and should be determined by a professional engineer familiar. For a 400 square foot slab, the man hours required to finish a two-car concrete garage slab is about 13 hours. The spacing is highly dependent on the concrete mix's shrinkage potential. The appropriate rebar spacing for most of the slabbing is 12-inches. A good compacted base below the concrete is equally important. 19 rebars for the slab. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. Generally, it is recommended to have at least the. Generally I would go with the #4 rebar (1/2-inch diameter) since the difference is cost should be negligible and it provides better construction (there should not be any splices in the rebar on a slab this small). Determine the rebar gauge. ( D) Depth of slab. View More. For a 4-inch RCC (Reinforced Concrete) slab, using #3 (3/8-inch diameter) or #4 (1/2-inch diameter) rebar is typical. Rebar should be placed evenly throughout the project. If you are in a climate subjecting the floor to freezing, get air added to the concrete. So if you have, say a 3/4" max. CONTROL JOINT SPACING. No, you do not need rebar for a 4-inch slab of concrete on grade. Common practice is to place supports 2 to 3 feet apart. Most homeowners can expect to pay between $4. Here:The size of rebar needed for a 4-inch slab depends on several factors, such as the type of material used for the slab, the type of project, and the size and weight of the load it will be required to carry. 60 per square foot for materials and labor. surface. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used. Cracking is really due to a number of causes. The main reinforcement of the slab panel “A” is marked as (1). 0 CONCENTRATED LOAD 2000 lbs. Expansion grooves should be cut into the wet concrete to provide additional crack resistance. Another beam might have a 11⁄ 2-or 2-inch camber. 2 mm in diameter. Generally, rebar is Grade 32 and utilized for 3-inch slabs. For example, a size 4 rebar will have a diameter of 4/8” or ½ inches. 668 pounds; Applications: Residential foundations, thin concrete structures, and masonry walls. The dowels will then be embedded in the ICF wall concrete. For unbonded topping, the minimum thickness is 75 mm. )(100)/(6 in. 3. Anyhow, the rebar chairs are relatively cheap. The sill plate is 2-inch (51 mm) or 3-inch (76 mm) nominal. This will provide adequate reinforcement for most applications. 5 rebar, then measure and mark for your dowels at a 18. For distribution bars the maximum spacing is specified as 5 times the effective depth or 450 mm whichever is less. in thickness, columns, walls, and parapets. 26 inches (18" controls) #3 bar = 15. If the wall exceeds four feet in height, footings should be poured separately. An 8-inch slab or thicker is required for CJ’s spaced up to 20 feet. The proper way to use rebar reinforcement is to ensure that it is laid in the center or slightly above the center of the slab's thickness. area = 25′ × 25′. The #3 rebar has a weight per length of 0. Here: Multiply the measurements together to calculate the square footage of the area. However, many engineers and. Above 12 1/4” they have a single cover height per chair. For example, if the percentage is 0. Four legs allow easy placements of multiple layers of steel. You can use regular fencing material with 2' x 4' or 2' x 6' mesh. This will provide adequate reinforcement for most applications. For very thick slabs, such as those 8 inches or more in thickness, half-inch rebar or larger is used. 4. You’ll pay about $1,200 for a 6-inch slab that measures 10 inches by 20 inches. The general rule of thumb is that control joints should be place no more than 3X the slab thickness (in inches). 13. No, you do not need rebar for a 4-inch slab of concrete on grade. 10%. Rebar Spacing OC + Waste / OverlapWith this calculator, you’re trying to calculate the dimensions of your rebar grid (length and width). Using rebar in a 4-inch slab provides a multitude of benefits, enhancing the structure’s strength, stability, and durability. e. approximately the bar diameter in eighths of an inch [whole millimeters], used to designate the reinforcing bar size. Place the holes at the 2. Can I pour concrete directly on dirt?Placing 0. The thickness of rebar should be no more than 1/8 that of the slab, so a 4” slab shouldn’t have steel greater than #4 or 1/2″ bar. Works with all sizes of rebar. For example: A #5 [#16] bar is approximately 5/8 inch [16 millimeters] in diameter: a #9 [#29] bar is approximately 9/8 inches [29. When rebar is used, it needs to be laid slightly above the center or in the center of the thickness of the slab, with a spacing of 12 inches. Cover the fill with a layer of 6-mm plastic sheeting. 6, the designer can exceed the CJ spacing in Table 10. For a flat slab, such as a driveway, consider placing the rebar in an 18 inch grid spacing, keeping the edge rebar at the same distance from each side. 1: Post holes for pole buildings: 1For a flat slab, such as a driveway, consider placing the rebar in an 18 inch grid spacing, keeping the edge rebar at the same distance from each side. 10. But if one should choose to reinforce their concrete patio, the reinforcement bar they should use should be a size #3, which is 3/8 in diameter. Horizontal-need 2 rebars each run with 3 or 4 runs of rebar 2 feet apart and rebar size 1/2 inch or 5/8 inch. All thick slabs can be categorized into:. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used. 2 only if the steel reinforcing is greater than 0. 2. How do you calculate rebar spacing? Find the rebar-to-spacing multiplier with the formula M = 0. To reinforce a 4” concrete slab or driveway with steel rebar, determine the grid spacing and rebar size – #3 or #4 in a 12” to 18” grid. Rebar in patios, basement floors, footings and driveways may vary from size 3 to 6. Driveway : The total cost of a concrete driveway will depend on size. For foundations that are taller than 8 feet and slabs thicker than 8 inches, the minimum spacing should range from 7. 34 and $7. 7 mm) anchor bolts spaced not greater than 6 feet (1829 mm) on center or approved anchors or anchor straps. Placing WWR in Two-Course WorkGenerally, a #4 (1/2-inch diameter) or #5 (5/8-inch diameter) rebar should be sufficient for most residential and commercial applications over a 6-inch slab. When a load is applied it bends the concrete on end, this is how the crack starts, the point of failure. Wood sole plates at all exterior walls on monolithic slabs, wood sole plates of braced wall panels at building interiors on monolithic slabs and all wood sill plates shall be anchored to the foundation with minimum 1 / 2-inch-diameter (12. For very thick slabs, such as those 8 inches or more in thickness, half-inch rebar or larger is used. Lay down wire mesh or rebar on top of the sub-base if necessary. And rebar is sized by eights of an inch. 058 percent, which is only enough for crack containment. 4m2. Special surface finishes, including coatings. A cubic yard of concrete—equivalent to 27 cubic feet—will cover an 81-square-foot area with 4-inch-thick concrete and cost $113–$126. Minimum concrete cover over (and to the sides) of the reinforcing bars is 1 1/2-inches, whereas the minimum concrete cover under the rebar is 3-inches. Tying should include bars near the ends of the bridge and bars near the curbs.