Now, divide each measurement by the 14-inch spacing. If you are in a climate subjecting the floor to freezing, get air added to the concrete. 3 Storey Building: Larger diameter rebars, such as 16mm and 20mm, may be used to accommodate the. g. I have reinforced composite slabs 3 ways: all mesh (my least favorite), all #3 bars, or mesh w/ rebar over the beams only for slab negative reinforcement. You will be able to add radiant floor heat any time. Learn the steps to pour a concrete floor inside an existing garage, house or shed. 10) Deflection and end-slip behavior. 00 m 21 reinforced concrete slab 3 mm for every 3. 7. This article presents steel quantity computation process for slabs, columns, and footings. European, which is a carbon/steel/manganese alloy. Thickness of concrete slab depends on loads and size of the slab. 9 Factored loads Factored dead load = 3. In this video, you will learn the Spacing between the Main and Distribution steel bar. get your rebar grid down, i would use 1/2" on 12" center. Pour 6" fiber reinforced concrete over it. 1 Required design elements—Following are the minimum items that should be addressed in the construction Rebar Spacing Basics. The compaction UNDER the slab is more important than the thickness of the slab. 3%. #4 is 4/8”, or 1/2”. . 21 m 2. It depends on what the 4-inch slab is being used for, as well as the location and soil type where it will be poured. 4. Industry Practitioners. for concrete floor construction are found in ACI 360R for slabs-on-ground, ACI 223R for shrinkage-compensating concrete floors, and ACI 421. Rebar Spacing; D2-8F: 4. 1 of the 2021 International Building Code (IBC) specifies that the thickness of concrete floor slabs supported directly on the ground shall not be less than 3 1/2″. 96-8. If the owner can live with cracks over the beams, there is no need to provide negative slab reinforcement. Stainless steel rebar. This new slab design does not account for second floor installations or installations in a ground floor with a basement beneath. For the short side, 240 inches divided by 14 inches gives you 17 lengths of 20-foot rebar plus a bit left over. I recommend use of M20 grade of concrete. The minimum size and grade of rebar for slabs depends on a variety of factors, such as the thickness of the slab, the loads it supports, seismic requirements and other factors. What size rebar do I need for a 6 inch slab? The size of rebar needed for a 6 inch slab would depend on the specific application and requirements. This how-to guide will show you how a. If you want, you can cut out of a section of the steel for testing too. h. Rebar would be absolutely required in a footer located near the frost line or in the areas subject to moisture changes in shrink/swell soil areas. Concrete volume calculator plan view diagram. 15 mm) polyethylene vapor retarder with joints lapped not less than 6 inches (152 mm) shall be placed between the base course or subgrade and the concrete. If the weight of each steel beam is 62 lb/ft, determine the dead load in lb/ft supported by any interior beam. Here, ∅ is the bar diameter. #4 Rebar ; The #4 rebar is often used in residential and commercial projects to add strength in slabs and columns. 87 (round up to 13)Add one rebar. Figure 1b: Joint Spacing in Feet Contraction joints may be tooled into the concrete surface at the time of placement. 2. 3%. Here:Bar Tying Requirements. In this video i will show you about 2nd Floor Slab Rebar. Part 3. , the minimum footing width or area shall comply with Table 9. #5 rebar on a 6X6 grid, No cracks in that, poured the same time as the slab in the heated addition. 1. girder sides & slab on grade - 1 reinforced concrete beams 6 mm for every 4. It illustrates and explain. 27. vided in the slab under the net. Local code authorities often specify the type and placement of the reinforcement in a monolithic slab. Horizontal rebar starting at 12 inches and at 18 inch intervals after to the top. The simplest type of two-way slab to construct is known as a flat plate. To se-lect the appropriate steel area (As), use theFor example, if both slabs have rebar mats that are spaced at 18 inches and use No. Rebar Spacing for Concrete Slab. Often, concrete contractors don’t have solid runs of rebar anyway. Rebar SizesOn studying the drawing, Length of longer side of building = 16. (5) Concrete foundation stem walls that are formed by a thickened concrete slab edge as part of a slab on grade floor must be reinforced with one piece of No. 46 and $1. 1R-15 Guide to Concrete Floor and Slab Construction, American Concrete Institute, ACI 360R-10 Guide to Design of Slabs-on-Ground, American Concrete Institute,. The cross‐sectional area of one N28 bar is As = 620 mm2 and with N12 stirrups at 150 mm centres, Atr = 110 mm2. Concrete is cast on top to a depth of about 3 inches over the top of the forms, encasing the rebar in the beam pockets and the mesh. Reduce evaporation over the slab by using a fog spray or slab cover. The rating your floor can withstand is also factored in. 6 inches. Crack Control – when crack widths are not checked by calculations No Further Checked Required. The load needs, and the span of the slab decide the spacing, size, and placement of the bars. Minimum clear cover to reinforcements in slab depends on the. t + d Lsy. Similar “uncontrolled” or “random. Rebar comes in several types: Steel mesh, made up of steel wires that provide support to the concrete. The ACI 318-19 provides a number of requirements regarding slab thickness, concrete cover, and reinforcement ratio which facilitate the design process. Vibratory loads. e. x 18 in. square poured concrete beams and columns. 10%. Wire mesh is better then rebar, if it can be kept up off the bottom of the slab. The following guidelines given below according to BS 7973-2:2001. It has Spanish language descriptions, labels and diagrams and it also has default units in the metric system (SI). secondary containment floor slabs on grade. , interior beam dimensions = 14 in. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. The bracing comes out after curing. 2ND FLOOR CRACKING WIDTH. Maximum spacing: The maximum spacing of main bars is limited to 3d or 300 mm (whichever is less). In t e r p r etations of the ACI 318 code re q u i r ements (Ref. Concrete doesn't dry out; it undergoes a chemical curing process that creates a dry, solid mass. Tying is required at every second or third intersection, depending upon the size and spacing of bars, but with not less than three ties to any one bar, and, in any case, not more. 530 m Therefore, gross area of building = 201. a) Slab depth does not exceed 250mm when the steel grade is 250. Step 1. Inclined length = 0. A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. 00 m 21 reinforced concrete slab 3 mm for every 3. 5. , interior beam dimensions = 14 in. -i::= ::::i. Enter the slab dimensions, desired rebar spacing and the spacing from the edge to quickly find how to lay out the rebar grid. The national average cost of a concrete slab is $6. opening is framed by beam bars up to beam support in two way slab extend 400This video demonstrates how to theoretically calculate the sizes and spacing of steel bars of suspended slab and concrete stairs. ”In particular, for slabs containing less than minimum quantities of conventional tensile reinforcement (i. and 6000 btu/hr heat loss in the second. 3 For long, narrow panels, place rebar at 0. Looking at the layout of the walls i think that the slab is 1 way spanning, but i would like to know what methods are available to check this. to 9. ÞArranged bars should be strong enough not to deflect when a person steps onmaximum spacing of reinforcement in both directions. This design approach is sometimes referred to as continuously reinforced or joint-less slabs and allows numerous, closely spaced (3 to 6 feet), fine cracks to occur throughout the slab. Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. 5 cm) thick footing, the rebar mat is usually placed about 4 inches (10. Clear span of the two way slab = 5000 mm. The actual measured building width must be converted into the nominal building width for use in the Foundation De-sign Footing Tables and Anchorage Tables. 2 Storey Building: For increased load-bearing capacity, a mix of 12mm and 16mm rebars could be appropriate. Click on Calculate button to get the total weight of the steel rod in the slab. 2) Where the supported joist span exceeds 4. The maximum diameter of bar used in slab should not exceed 1/8 of the total thickness of slab. By Concrete Construction Staff. the calculator will give you the default spacing values (for rebar – rebar it’s 40cm, and for edge – grid it’s 8cm). Sub-slab details (i. 2. Column spacings are 48 feet center to center. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. 1 -The no. 2ND FLOOR CRACKING WIDTH. The thickness of RCC roof slab is vital. 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. Steel reinforcement bar size for footing of G+1/ 2nd floor building:- we will assume a structure of G+1 (two storey) residential building, using standard 4″ thick walls, according to general thumb rule, use of mesh bar of 12mm or number 4 (#4) size (diameter) of steel reinforcement as main and distribution bar (T12@6″C/C of Fe500) is most. If two or more courts are constru c t e d , expansion joints should be prov i d e d midway between court s. 5, which correspond to diameters of 3/8-inch, 1/2-inch, and 5/8-inch, respectively. Draw also the typical beam detail showing the main. AI Homework Help. last quarter of 2014, the prices i got for the rebars (12m lenght) are: 9mm deformed rebar - P110 10mm - P138 12mm - P205 16mm - P385. This wood sheeting, which should also be stronger than average, will act as a subfloor. 2. e. Number of Required Bars Formula = (Length of slab / spacing) + 1. It create a bending of the slab. 2 cm) from the bottom of the concrete, and side clearances range from 2 to 4. 5% reinforcement (reproduced here as Table 1). Contraction joints (or control joints), when cracked, are really just straight shrinkage cracks. Its rebar size in inches is 0. With this calculator, you’re trying to calculate the dimensions of your rebar grid (length and width). To assign a Slab element to the floor, go to Assign>Wall/Slab/Deck sections. Typically, once the concrete in the foundation wall has set, install the floor system. If the slab is poured against an existing foundation wall or another slab, you would use the #4 or #5 rebar to dowel it to the which ever you are butting too. AS3600-2009 P P Lsy. If the slab is more than 24 inches thick, #5 (#5/8 inch diameter) rebar may be required. • The slab is designed as a continuous slab, using theory of continuous beams (slabs), or the simplified ‘coefficient’ method (where applicable i. Thickness of concrete slab depends on loads and size of the slab. All floor elements were brought in as DECK elements. /18 in. You will be able to add radiant floor heat any time. Prices for your concrete slab will vary. make sure rebar is in the center of the slab, or close to it. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. 64 mm) between longitudinal rebar 2 and 3, which is the same as the rebar construction and traditional tape measurement results. A good GPR survey and interpretation should give you the rebar spacing and pattern. In inches the diameter of a #5 rebar is 5/8″ and that of a #4 rebar is 1/2″. Grade 40 means that the yield strength is 40,000 psi and the code allowed strength is 20,000 psi. The compaction UNDER the slab is more important than the thickness of the slab. 7. 59 per square foot. MAX and #5 top placed at center of slab" I installed the #3 dowels 12" apart and 6" into the existing surrounding floor. The building code requires a minimum of No. Where the bar used is Grade 60 and the size specified in the table, the actual spacing in the wall shall not exceed a whole-number multiple of 12 inches (i. Why Does Concrete Require Rebar? Most concrete requires some type of reinforcement. There are two types of Grade slabs: Usually after casting Plinth beams. Running Bar Points (Length - Left to Right): Running Bar Points (Width - Top to Bottom): Calculate Rebar Quantity and Mesh From Total Slab Area and Perimeter. ( rS) Rebar Size (2,3,4,5,6,7,8,9,10,11,12,14,16,18,20). ACI 330R-08, Guide for the Design and Construction of Concrete Parking Lots is. 20 Plant-applied External Fusion Bond Epoxy Coating [Abrasion-Resistant Overcoat] for Steel Pipe (CSA Group, formerly the Canadian Standards1) Except as provided in Sentences (2) and (3) and in Articles 9. Cutting that rebar ain’t going to do shit, despite all the “engineers” comments to the contrary. girder sides & slab on grade - 1 reinforced concrete beams 6 mm for every 4. Sa Episode na ito, gagawa tayo ng rebar cutting list para sa suspended slab ng 4 storey building. 1 Spacing s of transverse reinforcement in cast-in-place walls shall not exceed the lesser of 3h and 18 inches. The design of one-way slab is simple and can be carried out easily. C. A typical installation uses 6-inch by 6-inch woven wire mesh, which is supported on rebar chairs so it is positioned near the center of the finished slab. Here: Bar Tying Requirements. Place these positioners at a spacing that will not allow the rebar to bend or deflect enough to reduce the coverage you wish to obtain with the concrete you place in you forms. 3. 3. But as the depth grows, so does the need for reinforcing the structure. 0 pounds per cubic yard (0. Functions of Distribution Bars In A SLAB: Distribution bar is to provide at the long span of the slab. 6 Pedestrian Circulation--Stairs and. Corner cracking and joint faulting are reduced by using these bars. Rebar. 10. Dynamic and/or oscillatory. 1 L from the center of the support at end support and 0. Its primary purpose is to increase the tensile strength of the concrete, helping it resist cracking and breaking. The lengths are in meters and centimeters, the areas are in square meters, the volumes are in cubic meters, and the weights are in kilograms and metric tons. This design is particularly effective for structures with consistent loads. There are many variables that influence the decision of how much space to leave, including the maximum load the slab is likely to have to support, the bearing capacity of the soil, the diameter of the reinforcing rebar, the likelihood of frost heaving the. (ii) The maximum spacing between two secondary parallel bars shall be 5dor 450 mm or. For M15 concrete, lever arm = 0. Annex. , interior beam dimensions = 14 in. Round up the value of n to the next whole number to find the nominal rebar size required for that spacing. Wire mesh. x 18 in. These cracks have little impact on durability. The spacing of the main steel in a slab should not exceed the following:First, the American Concrete Institute (ACI) Residential Code Requirements for Structural Concrete (ACI 332-14) requires contraction joints and provides a table to determine joint spacing for plain and reinforced concrete containing up to 0. Parking lots have most loads imposed on interior slabs sur-11. For the trapezoidal, dovetail, and reentrant composite slabs, and RC slab, welded rebar meshes with Φ 8 ribbed bars were selected, and bar spacing was 200 mm in both directions. The performance of the paving joint is enhanced by these bars. 5 bars; There shall be a minimum clearance between parallel reinforcement bars of 2 1/2 inches; Bars larger then # 5 increase the chances of shadowing (voids behind rebar) Always use the larger of the two. ( W) Width of the slab. MINIMUM VERTICAL REINFORCEMENT AND SPACING (INCHES) b, c: Soil classes and later soil load d (psf per foot below grade) GW, GP, SW and SP soils 30: GM, GC, SM, SM-SC and ML soils 45:Concrete Floor Slabs On Grade Course# ST-702 EZ-pdh. Rebar Grid Calculator. 1 can be used for these purposes. The pri m a r y differe n c e s b e t w een each type are re i n f o rc e m e n t details and joint spacing. If too much water was. You should still use reinforcement material, but there are other options besides rebar. There are many variables that influence the decision of how much space to leave, including the maximum load the slab is likely to. Compressible floor-covering materials that compress more than 1/ 32 inch (0. unless otherwise noted, all slabs on grade are to be reinforced with 10mm bars at 400mm o. Common Rebar Sizes. Our engineers wanted to make sure that big yellow boots fit between the rods so the workers did not stand on the rod and bend or. 8. Crack Control – when crack widths are not checked by calculations No Further Checked Required. The architect's instructions on the plan are: “New conc slab with #3 transverse bars at 12” O. One Way Slab Bar Bending Schedule Calculation. 6. SLAB REINFORCEMENT SIZE REINFORCEMENT SPACING ANCHOR ANCHOR Cutting that rebar ain’t going to do shit, despite all the “engineers” comments to the contrary. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. In low- to. It follows that the design yield strength of reinforcing steel that may be used in a slab designed in accordance with AS 3600-2000 is 400, 450 or 500 MPa. These beams are not fixed together with a slab as are superstructure beams; consequently concrete has to be poured down the beam’s narrow top opening and reach the bottom of the beam. If the soil conditions on are not covered by this Part then additional guidance can be obtained from. Suspended slab/Two-way slab/One-way slabToday's video answers the questions I get asked most frequently: - How do you read or interpret slab reinforcement pl. Garage floors that are at least six inches thick should have rebar because it provides the best support, but garage slabs thinner than that do not need rebar. 00 m 7 cantilever reinforced concrete beams 18 mm for every 3. 40ft x 15ft dumpster pad, 8" thick with double mat of #4 rebar 16" OC Each way. 45 to 1. Minimum. The maximum size of reinforcement shall be No. Prepare and Place Reinforcement for Slab. 5 bars; There shall be a minimum clearance between parallel reinforcement bars of 2 1/2 inches;. 376 lbs/ft or 0. The 4″ slabs-on-grade are placed on a layer of. -Multishearing. PSI means per square inch. A 6-mil (0. The height of the slab bolster is determined by the required concrete protective cover. 6) Calculation of top rebar Please refer to the method in construction site as follows because it is very difficult to explain in theory. most of the time). In summary the design procedures for beams and floor slabs are similar with the following differences: (a) Minimum steel. Important Points. Calculation Method For Find Out The Overlapping Length Of Beam, Column And Slab; Bar Bending Schedule For Slab And Estimation Of Steel Reinforcement In Slab; Calculation steps. In a typical reinforced concrete building, reinforcement bars arranged as mats are incorporated into a concrete plate of minimum thickness 125 mm to form a reinforced concrete solid slab. 8. (1) ε = θ (h b + h s) L-L 1. Steel fibers, at 1. For flat slabs like driveways and patios, spacing is roughly 18″ to 24″. : Theoretically there is no difference because the restraint to movement is the same in all cases. Finally, you pour the concrete into the molds. I'd use: 8" thick concrete wall with #6 rebar at 12" oc EACH WAY with the VERTICAL rebar placed 3/4" clear from the face of the INTERIOR BASEMENT ROOM. In the case of the RCC slab, the maximum spacing between two secondary parallel wires should be 5D or 450 mm or whatever. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. And the rebar. I maintain a concrete cover of 40 MM. Retaining Walls: The most commonly used rebars in retaining walls are #3, #4 and #5. #3 is most commonly used for patios and driveways, #4 for columns and walls, and #5 for foundations and footers. Rebar is typically made of different types of steel. The elevation to the top of the decking (bottom of the concrete waffle slab) for forming of the second floor above-grade slab is ___. Concrete rebar calculator plan view diagram. 1 in2. 1. 00 m 14 over 6. , edge beam dimensions = 14 in. Use 3/8 min repair frame in the footing. I can't believe after being in this business for 12 years I've yet to pour a very long re-inforced concrete slab. Spacing of mechanical shear transferring devices, s, where variable from one profile to another; and . Total Volume of concrete in cubic yards. Design drawings are used as a base for computing rebar quantity in different structural elements. Input the number of mesh in slab rebar. 5 bar or two No. This calculator uses 35% of balanced rebar area as the steel area for design of slab. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. Minimum aging of new concrete slab: 28 days (cure time) Minimum width and length of slab: See new slab table & figures below MIN W L R S1 & S2 D I LIFT MODELS SLAB MIN. 3 bars may be used, for constructability and handling reasons it is common practice to use no. SLAB BOLSTER—Continuous bar support used to support bottom slab bars. Minimum aging of new concrete slab: 28 days (cure time) Minimum thickness of concrete slab: See new slab table & figures below. The procedure: Lay up the first 4-foot height of wall. In this video, you will learn the Spacing between the. ) (12 in. Select the SLAB1 property and click on the Modify/Show Section. The maximum anchor bolt spacing shall be 4 feet (1219 mm) for buildings over two stories in height. e. INSTRUCTIONS: Choose units and enter the following: ( L) Length of the slab. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. The spacing of the main steel in a slab should not exceed the following: First, the American Concrete Institute (ACI) Residential Code Requirements for Structural Concrete (ACI 332-14) requires contraction joints and provides a table to determine joint spacing for plain and reinforced concrete containing up to 0. The Rebar Calculator is now available in Spanish. 10mm, 12mm, 16mm, 20mm. The formula is, Number of bars = (length ÷ spacing) + 1. Learn More. 3. In either case, blocks should be used under the. In general,. 2130605 2 = second floor B = beam member 06 = 6/8- or 3/4-inch (1. Typically, once the concrete in the foundation wall has set, install the floor system. First, Get The Number Of Required Bars. A 6-mil. However, there is no need to tie the garage slab to the new foundation, and in fact a strong case against doing so. Pool construction crews must place each steel bar and drop of concrete with precision to avoid future structural problems. 2-way slab rebar arrangement method 1-way slab rebar arrangement method Slab main bar arrangement type classification Bent bar type. 2. rebar spacing o. in concrete slabs. 4th. The shear reinforcements are provided from the support. Consequently, building such slabs requires rebar spacing knowledge. Types of Slab Construction ACI 360. In concrete slabs, the nominal maximum size should not exceed three-fourths of the minimum clear spacing of reinforcing bars or one-third of the section depth (ACI 302. Compressible floor-covering materials that compress more than 1 / 32 inch (0. Slabs. If your concrete will be stamped, ask about the best ways to avoid interrupting the pattern. The main reinforcement of the slab panel “A” is marked as (1). That is the best way to have good concrete in such a place. It has Spanish language descriptions, labels and diagrams and it also has default units in the metric system (SI). Shrinkage cracks are probably the most common type of cracks in concrete. Once you input these values, you. So, if we have used 12mm dia rebar in column maximum permissible spacing is 72mm and for 16mm dia longitudinal rebar the spacing is 96mm and so on. If a concrete slab is 4 inches thick, the depth of the control joint should be 1 inch. The Rebar Calculator contains equations and data used in working with reinforcement bars (rebar) in concrete slabs. For this case, the lift should not be. A flat plate floor with a live load of 100 psf is only about 8% more expensive than one with a live load of 50 psf, primarily due to the minimum thick-ness requirements for. 3. Advertise Here. The gauge, or diameter, of the rebar is selected based on the purpose and the load-bearing requirements of the structure: For standard residential concrete slabs, #3 (3/8 inch diameter) to #5 (5/8 inch diameter) rebar is typically used. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. (i) The maximum spacing between two parallel main reinforcing bars shall be 3dor 300mm or whichever is less, and. In t e r p r etations of the ACI 318 code re q u i r ements (Ref. However, the boilers I have been recommended is the Electro boiler (30,000. Step 1. 1) describes six common types of floor slab con-s t r uction. 15 mm) polyethylene vapor retarder with joints lapped not less than 6 inches (152 mm) shall be placed between the base course or subgrade and the concrete floor slab, or other approved equivalent methods or materials shall be used to retard vapor transmission through the floor slab. Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. 6mm. rebar strength is in tension, so by adding rebar to BOTTOM of foundation, it counter acts the load of compression. Concrete blocks made of sand-cement mortar can be used in place of the slab bolster. (I think someone touched on this) Your floor covers some span. In the case of the RCC slab, the maximum spacing between two secondary parallel wires should be 5D or 450 mm or whatever. Generally speaking, a 4-inch slab should include some form of reinforcement such as rebar or wire mesh. normal rebar sizes (e. 00 m to 6. Locating conduits (plastic & metallic) and in-floor heating lines in concrete, or just below a slab-on-grade. And a cross-sectional area of 0. I was thinking of the following: basement wall 8 inches thick 10 feet high backfilled up to 7 to 8 feet. 8 mm) when subjected to 50 pounds (23 kg) applied over 1 inch square (645 mm) of material and are greater than 1 / 8 inch (3. Rebar is recommended on concrete measuring 5 – 6 inches thick. Contact*: Severity*: Description*:Problem #3 – Shrinkage cracks that allow moisture to reach the rebar. In that case, a layer of rebar near the bottom or at. T F 8. Steel shall be located within 2” of the top or the upper 1/3 of the slab. Vertical rebar every 16 inches. For this case, the lift should not be installed without written authorization from the building. The typical depth for rebar placement for slabs is 2-4 inches. Table 7-6. Then use USDA NRCS Standard Drawing ES-46 to select ( ) There's no generally-accepted rule of thumb as to how to space rebar in a concrete slab. ACI 318-14 Section 8. On average are required, for 10 square meter with 12cm thick slab, 19 strips of 3/8” rods (9ml each one), are 171 ml. 15% of the slab’s cross-sectional area), the spacing of tendons in at least one direction shall not exceed the smaller of eight times the slab thickness and 1. #LonbicooltvUsing the search function should turn up a lot of info. For footings that are poured before the slab, two #4 horizontal pieces of rebar are required – one 3” from the top and the other 3” from the bottom. Rebar spacing in a slab footer will depend on the size of the slab, the load it will support, and local codes. spacing requirements and to repeat bar size and spacing as often as possible. 00 m 14 over 6. Rebar size and spacing is dependent on the strength required. Minimum tensile strength of concrete: 4,000 PSI. First year, cracked! The slab out the back door is 16 X 30, 4". 42d. ASCE, SECB COURSE CONTENT Slab on Grades Construction: Introduction Concrete slabs on grade are a very common type of concrete construction. Fill in the price and single rebar length that you will buy at your supplier: rebar price = €2/m single rebar length = 6 m. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. 5 kPa), column spacing typically ranges from 15 to 25 ft (4. 1) for con-c r ete cover over re i n f o rc e m e n t h a v e not been consistent. 73 per square foot, with an average cost of $6. 5" of XPS foam board underneath, 1150 square feet, 7 feet below ground. For example in a slab of 6-inch depth, a rebar of 6/8 inch will be used.