Reading time: 4 minutes. Its rebar size in inches is 0. 42d. spacing requirements and to repeat bar size and spacing as often as possible. 1. 9 Factored loads Factored dead load = 3. In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. ) is going to be 5'-6' for 4 ksi concrete anyways. 73 Therefore, use 12 mm bars @ 0. Number of Required Bars Formula = (Length of slab / spacing) + 1. All floor elements were brought in as DECK elements. 5 m. The slab will have 1/4" vinyl applied to the top, and we were thinking of casting the slab without control joints to prevent curling at the joints. The movements of these structural elements are likely different than those of a slab-on-grade due toWhen operated by our highly trained Project Managers, GPR’s typical accuracy is +/- ¼” to the center of the object in concrete we locate: conduit, post tension cables, and rebar. 5” long, are typically dosed at the rate of 60-68 pounds per cubic yard. cedures used to design and construct slab-on-grade such as streets, highways, and floors. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. Slab may be supported on walls or beams or columns. Section 13. Advertise Here. Rebar mesh: Cut and lay 6-inch rebar mesh across the site, covering all areas except for a 3-inch band on the outside. 3. Measure the cover depth of embedments. Build the wall full height, place concrete continuously in 4-foot lifts, and consolidate each lift. 25" 3,000 PSI / 28 Day Aging #6 Rebar: 12 in: D2-10 Models: 4. to 9. MAX and #5 top placed at center of slab" I installed the #3 dowels 12" apart and 6" into the existing surrounding floor. 2. Figure 2 illustrates the typical locations of the top and bottom bars within the composite slab cross-section. (150 to 250 mm). get your rebar grid down, i would use 1/2" on 12" center. 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. I have some question regarding the placement of the expansion joints. 75 to 3. If the floor is. x 20 in. The steel rods help reinforce the strength of the concrete slabs giving the structure a strong form. The top of the wall will need "hooks" in the rebar in order to fasten the wall to the garage slab. Corner angle. Calculate how much rebar you need to reinforce a concrete slab. The performance of the paving joint is enhanced by these bars. Select the unit of dimension like meter, feet inch, etc. Tie the rebar together. 2. Besana. The footings included in this Part reflect the requirements of AS 2870 and apply to the most common types of soil conditions. 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. a car weight about 5000lb. Rebar Grid Calculator. 1: Calculate The Main bars. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. Because of this, the Building Code places limitations on the size and spacing of rebar in gunite & shotcrete. This new slab design does not account for second floor installations or installations in a. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Once you have determined that the foundation of the house is strong enough to sustain a concrete floor, lay down wood sheeting. 5. 4th. make sure rebar is in the center of the slab, or close to it. If the pressure on the concrete is to come from the top of the slab, the reinforcement should be laid deep near the bottom of the slab. The current British Standard or guideline for tying reinforcement can be found in the document BS 7973-2:2001 (Spacers and chairs for steel reinforcement and their specification — Part 2: Fixing and application of spacers and chairs and tying of reinforcement). If you want, you can cut out of a section of the steel for testing too. , and unfactored live load = 100 psf. diameter), spaced at a maximum of 24 in. mk . Slab re i n - f o r cement and joint details for this type of court are shown in Fi g u r e 3; a cross section and other typical tennis court details are shown in Fi g u re 4. Deformed bars mean that the rebar must have protrusions that will help the bar to bond mechanically with the. 1. The design of slabs for imposed loads and live loads is based on the type of the building. Select the SLAB1 property and click on the Modify/Show Section. We had twisted square bars in our 1911 second floor slab. The elevation to the top of the decking (bottom of the concrete waffle slab) for forming of the second floor above-grade slab is ___. , interior beam dimensions = 14 in. 15 feet x 12 inches per foot = 180 inches. 2 m top bars @ discontinuous edge Compute temperature bars 250 Using 10 mm f bars:. 25 inches (13 to 56 mm) in length. E. 76 Slab designation: CS1 Check if one-way or two-way slab 1 Slab is one way since it is catilever slab Minimum slab thickness min t = 69. 5 to 7. -Multishearing. 8 ). Also, a small hole in the concrete will be totally fine, given the fact that there is a rebar grid. that is 2. C. Concrete volume calculator plan view diagram. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the slab. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. Two-Way Concrete Floor Slab with Beams Design and Detailing. This new slab design does not account for second floor installations or installations in a ground floor with a basement beneath. The design of one-way slab is simple and can be carried out easily. However, in some cases, 10mm dia bars are taken for the floor slab, when there is no extra external load other than reinforcement mesh load. The distribution bars are installed in the slab’s top layer, with a minimal cover distance of 15mm from the slab’s top. My main building is 6" concrete with #4 rebar on a 6X6 grid. Patio slabs are used in pathways. 2. The specified compressive strength of concrete shall be as set forth in Section R402. The concrete floor will be reinforced according to WAC 246-359-430. Understanding the Importance of 2nd Floor Slab Thickness for Building Safety and Stability in the Philippines The safety and stability of a building depend on various factors, and one of the most crucial is the thickness of the second-floor slab. The basic building block of this application is further known as a composite floor slab. Low-carbon st eel is mostly iron and ferrit e with 0. 6: 20mm clear cover in slab is sufficient. Under code, generally, one-story buildings with footings on undisturbed soil with LBVs between 1,500 and 4,000 should have a minimum width of 12 inches. To maintain strength and longevity, concrete slab rebar spacing must fit together like a jigsaw puzzle. I can't believe after being in this business for 12 years I've yet to pour a very long re-inforced concrete slab. Second level 6 inches thick 9 feet tall. These slabs require more load-bearing capacity than other slabs. spacing, and other details. Rebar, or reinforced steel poles, are a vital structural element of a pool. This is essential to know how much Rebar for the concrete slab is required. FIrst, find number of rods required for main reinforcement and distribution. , edge beam dimensions = 14 in. ( rS) Rebar Size (2,3,4,5,6,7,8,9,10,11,12,14,16,18,20) Use Size "0" for. Space joints (in feet) no more than 2-3 times the slab thickness (in inches). 60 per square foot for materials and labor. In summary the design procedures for beams and floor slabs are similar with the following differences: (a) Minimum steel. 2L at the intermediate support. This configuration directs load transfer predominantly in a single direction toward the columns. 1 Flexural Cracking in Reinforced-Concrete SlabsFor mid-depth rebar, the program will use the bottom bar size and spacing options. So, there exist guidelines for spacing rebar inside a concrete slab. 34 inch (8. First year, cracked! The slab out the back door is 16 X 30, 4". In two-way construction, According to Clauses 8. 12% for HYSD bars and 0. It is not hurting anything by putting it in a floor slab, but unless it is in the bottom third of the slab, it is providing zero strength, just keeping the pieces together if it cracks. Minimum reinforcement is 0. of main bars – One = [Lx ÷ bar. The structural design of the concrete floor slab on-ground is dominated by the sub-grade conditions and the floor loadings. Reinforced concrete (R. For example, at Column I-4 between the basement and first floor, building plans required four pieces of horizontal rebar through the column in both directions to connect it to the slab. For single layer rebar, the design uses the top bar size, and spacing options. T F 8. 5 kPa), column spacing typicallyRepeat this process until you’ve laid all the necessary rebar. One Way Slab Bar Bending Schedule Calculation. 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. rebar strength is in tension, so by adding rebar to BOTTOM of foundation, it counter acts the load of compression. The following guidelines given below according to BS 7973-2:2001. Pool construction crews must place each steel bar and drop of concrete with precision to avoid future structural problems. of the most advantageous location for a floor opening depends on the type of two-way slab you’re designing or evaluating. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. In order to calculate this, you need to input the length and width of your slab. Reinforced concrete (R. The fibers must be high quality and tested to verify consistent strength. European, which is a carbon/steel/manganese alloy. Rebar. 00 m 4 3. ~ INTRODUCTION Cold-formed steel deck sections are used in many composite floor slab applications wherein the steel deck serves not only as the form. 3. Enjoy the Rebar Calculator for Slab. Here, ∅ is the bar diameter. 3rd. The minimum Sub-Base thickness shall be as shown in the table. For live loads of about 50 psf (2. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. 00 m to 6. A. Rebar is tied together, using wire, to hold it in place. I'm in the process of designing a elevated composite concrete and metal deck floor slab for a warehouse. For the slab's longer dimension, you'll need 360 inches divided by 14, which gives you 25 plus a bit left over. Its primary purpose is to increase the tensile strength of the concrete, helping it resist cracking and breaking. Concrete Slab Rebar Spacing Guideline Report an Issue. 3. Parking lots have most loads imposed on interior slabs sur-11. g. The installation of the rebar is critical for the success of the overall project. The 4″ slabs-on-grade are placed on a layer of. 1 of EC2, the recommended minimum spacing of reinforcing bars is 75 mm and 100 mm for laps. 5 meters and the support beams are basically 18 x 18 inch reinforced concrete beams that are really strong. Larger areas, lower loads, and higher seismic zones. One-Way Joist Slab Concrete Floors are constructed in a range of sizes with conventional spans. 4 × W1. 1 of ACI 318-111 identifies a two-way slab as a slab system designed for flexure in more than one direction. Because of this, the Building Code places limitations on the size and spacing of rebar in gunite & shotcrete. Sa Episode na ito, gagawa tayo ng rebar cutting list para sa suspended slab ng 4 storey building. Part 3. I was thinking of the following: basement wall 8 inches thick 10 feet high backfilled up to 7 to 8 feet. In either case, blocks should be used under the reinforcement to keep centered within the concrete. (Imagine you are walking around the slab) Hit Undo Last to Undo last side. 18 bar 11/2″. Wire mesh is better then rebar, if it can be kept up off the bottom of the slab. If the owner can live with cracks over the beams, there is no need to provide negative slab reinforcement. #3 is most commonly used for patios and driveways, #4 for columns and walls, and #5 for foundations and footers. Wire mesh. 1(a)(5) of ACI 318-19 states that the size limitations on aggregates are provided to facilitate placement of concrete around the reinforcement without. Sub-slab details (i. 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. Expansion grooves should be cut into the wet concrete to provide additional crack resistance. e. Construction joints also have this spacing for strip placement of the concrete. , or 5 h, where h is the slab thickness. We would like to show you a description here but the site won’t allow us. In terms of steel I was going to go with 2% of the slab cross-sectional area in each direction, with a maximum rebar spacing of say 12" to 16" to keep the crack widths small. For areas where heavy vehicles or equipment may be placed, our independent third-party engineers will specify rebar reinforcement for concrete slabs on grade. 2. Clear span of the two way slab = 5000 mm. Slabs for septic tanks may require the use. AI Homework Help. Pour 6" fiber reinforced concrete over it. 2. 21 = 183. A basic rule to follow when judging how deep a control joint should be is that it should be roughly 1/4 the depth of the concrete. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. Concrete is strong under compression, but has low tensile strength. In the Flat-plate slabs, the main bars are provided in one direction at bottom of the distribution bar (in a shorter span). Fill in the price and single rebar length that you will buy at your supplier: rebar price = €2/m single rebar length = 6 m. for early-entry sawed joints. 1 Required design elements—Following are the minimum items that should be addressed in the construction Rebar Spacing Basics. Pour 6" fiber reinforced concrete over it. 00 m 4 3. ˘ ˘ˇSpacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. The simplest type of two-way slab to construct is known as a flat plate. Thickness of concrete slab depends on loads and size of the slab. Rebar steel will be calculated for the bending moments “Mx” and “My. 04% to 0. If the slab in question is just for a patio or a similar purpose, #3 rebar with a diameter of 3/8-inch will do just fine. 3. Second, in cases where a T-beam is oriented so that it is parallel to the main slab reinforcement (e. I maintain a concrete cover of 40 MM. Wet your concrete after the pour. Thank ForSubscribeLikesShare. Annex. I am constructing a 10 unit 2 story condo building with concrete block and 10in. 74 equals 1824 lbs per sq feet. 1 Wall Reinforcements of SS and NS (a) Minimum Reinforcement in SS or NS walls - refer to TABLE 3. See full list on everything-about-concrete. The slab is constructed on well compacted granular fill, crushed stone or marl. AS3600-2009 P P Lsy. For foundations that are taller than 8 feet and slabs thicker than 8 inches, the minimum spacing should range from 7. In this article, we will examine the importance of reinforcing concrete with rebar and the proper steps. Placing the rebar at the bottom of the slab will provide no benefit to the concrete. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. Reduce evaporation over the slab by using a fog spray or slab cover. For example, if the first slab is at 12 inches and the second is spaced at 18 inches then measure and place your first mark at 9 inches and then continue spacing the marks at. Rebar is typically used to provide additional strength and rigidity to concrete slabs, so if the slab is intended. 3. (1) ε = θ (h b + h s) L-L 1. 8 of the Florida Building Code,. If you are in a climate subjecting the floor to freezing, get air added to the concrete. Slabs, walls, joists: No. The simplest type of two-way slab to construct is known as a flat plate. In either case, blocks should be used under the. 00 m 21 reinforced concrete slab 3 mm for every 3. 5-3 Dowel size and spacing. 2. The most common steel reinforcement or rebar sizes in residential construction are No. 5 bars; There shall be a minimum clearance between parallel reinforcement bars of 2 1/2 inches;. In Seismic Design Categories D 0, D 1 and D 2, slabs-on-ground cast monolithically with turned-down footings shall have not fewer than one No. If shear reinforcement is required for in-plane strength, spacing of longitudinal reinforcement shall not exceed l w /5. But as the depth grows, so does the need for reinforcing the structure. Reading time: 4 minutes. Rebar in a concrete slab is crucial to any building. GPR can help with: Pinpointing structural elements in concrete such as. C. Rebar Spacing for Concrete Slab. Matt, You need to tie the new footing and foundation wall into the existing structure's footing and foundation wall, so yes drill and epoxy the rebar in. . When two slabs are moved together, the impact loading created by the slab is reduced. 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. Crack Control – when crack widths are not checked by calculations No Further Checked Required. Check ACI 360R-10 Guide to design or slabs on ground. In some cases, concrete needs reinforcement with steel mesh. . or slab change soffit typical detail for beam 400 dowel 250 300 (typ. Understanding the Importance of 2nd Floor Slab Thickness for Building Safety and Stability in the Philippines The safety and stability of a building depend on various factors, and one of the most crucial is the thickness of the second-floor slab. 1. Enter the slab dimensions, desired rebar spacing and the spacing from the edge to quickly find how to lay out the rebar grid. The first step in getting reinforcement design for an elevated slab floor is defining design strip rules. Fiber length shall be 1 / 2 inch to 2. Input the number of mesh in slab rebar. reinforcement for the bottom fibers of the composite slab. ) slabs are plate elements used to form the floors of buildings. Types of Slab Construction ACI 360. Joints shall be spaced at 24 to 30 times the slab thickness but this need to be confirmed by a structural engineer. It has Spanish language descriptions, labels and diagrams and it also has default units in the metric system (SI). 1R). The top of the wall will need "hooks" in the rebar in order to fasten the wall to the garage slab. 1 -The no. Here: Bar Tying Requirements. Thank ForSubscribeLikesShare. 2): where f s is the calculated stress in the flexural reinforcement closest to the tension face of the section. 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. Drive a stake at the end. 11 in. 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. com Ezekiel Enterprises, LLC 301 Mission Dr. . The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm. If your two slabs have different spacing for their rebar mats, measure and mark so your dowels fall in the middle of the spacing of the second slab. 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. Reinforcing bars that are spaced too far apart could result in relatively large flexural crack widths. some different types of rebar affect not only the str ength but also the longevity and durability of concrete structures. 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. If you want to combine rods of two diameters, there would. for concrete floor construction are found in ACI 360R for slabs-on-ground, ACI 223R for shrinkage-compensating concrete floors, and ACI 421. Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. ( D) Depth of slab. Step 1. 3 Slabs-on-ground with turned-down footings. unless otherwise noted in plans or specifications, camber all r. Contraction joints (or control joints), when cracked, are really just straight shrinkage cracks. Basement slabs and interior slabs on grade, except garage floor slabs 2,500 2,500 2,500a Basement wallsc, foundation walls, exterior walls and other vertical concrete surfaces exposed to the weather 2,500 3,000b 3,000b Driveways, curbs, walks, patios, porches, carport slabs, steps and other flatwork exposed to the weather, and garage floor slabsThe Rebar Calculator is now available in Spanish. You will be able to add radiant floor heat any time. 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. , interior beam dimensions = 14 in. To define design strip rules, click the Slab Design Rules button on the Data Entry toolbar. Total Volume of concrete in cubic yards. 4, and No. Column spacings are 48 feet center to center. In this video, you will learn the Spacing between the. Local code authorities often specify the type and placement of the reinforcement in a monolithic slab. rebar strength is in tension, so by adding rebar to BOTTOM of foundation, it counter acts the load of compression. In the case of the RCC slab, the maximum spacing between the two parallel main reinforcement bars should be 3D or 300 mm or whatever. A one-way concrete joist slab, employed in building construction, is a structural system featuring a reinforced concrete slab supported by parallel, slender joists. This is one of the types of concrete slabs. 5 inches up to 12 inches. 74 sq feet 5000/2. When concrete is first mixed and poured, it has excess water in it and in the hardening process, the concrete loses its excess water which causes shrinkage cracks. extension of existing reinforced concrete (R/C) structural elements such as slabs, walls, and columns (Figure 3), either to facilitate expansion of floor space or to address other functional changes in the use of the structure. 2: Repeat and continue to draw complete (closed) shape. #LonbicooltvUsing the search function should turn up a lot of info. ) slabs are plate elements used to form the floors of buildings. If the maximum diameter for slab thickness is 75 mm, so the diameter of reinforcing bars should be 8 mm. Sixteen gauge wire is used to tie. The national average cost of a concrete slab is $6. 14 and No. 3. (as in example diagram) First, enter the concrete slab sizes: length = 6 m, width = 4 m. In this video, I'm sharing you the process of concrete pouring and sizes/spacing of rebars for the beams and slab concrete for the 2nd floor of this project. Step 2 - Prepare the Floor. 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. For instance, the ACI 318-19 specifies minimum slab thickness that satisfies deflection. The more layers of rebar you have, the harder it becomes to properly vibrate the concrete. Kim Min-Koo et al. Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. Where, d is the diameter of the bar. If the weight of each steel beam is 62 lb/ft, determine the dead load in lb/ft supported by any interior beam. These slabs are supported directly by the columns and have a completely flat soffit. Specify the spacings: rebar-rebar spacing = 40 cm, edge-grid spacing = 8 cm. 6 inches. b. vapor retarders - some times referred to as vapor barriers, insulation, etc. Lower composite deck-slab weight than 3WxH-36 for the specified concrete thickness 8 inch on center low flute spacing to allow for bearing wall studs to be at 16 inches on center Non-composite deck 7⁄ 8 inch depth, 32 inch coverage 2 foot to 7 foot Span Range No Acustadek® Options Good for short span conditions1. It is possible to pour a concrete garage floor without installing rebar for reinforcement. The minimum column size should not be less than 9 "x9". Specify the spacings: rebar-rebar spacing = 40 cm, edge-grid spacing = 8 cm. Many concrete slabs for homes, driveways, garages, and sidewalks are built according to standard thickness recommendations and do not require a specific. Floor slabs can range from a simple residential basement slab to a heavy-duty industrial floor. Matthew Stuart, P. Next fill the cores with grout and repeat the process--lay another 4-foot. MTOTAL SLAB Rebar SPACING, LOCATION Shear THICKNESS Size (Ø) mm REMARKS kN-m. A slab with this joint spacing may be reinforced with bars (ASTM A 615, A 616, A 617, or A 706) or WWF (ASTM A 185 or A 497). 7. The building code requires a minimum of No. Crack Control – when crack widths are not checked by calculations No Further Checked Required. Most residential slabs contain reinforcement of less than. 00 m shorter span one-way floor slabs under 3. Check the Buckling Capacity of Rebar. 3: Two-way slabs supported on four sides; Clause 6. , the minimum footing width or area shall comply with Table 9. L is the effective length of the beam and slab. 00 m 7 cantilever reinforced concrete beams 18 mm for every 3. 00 m to 6. e. For the rebar-truss composite slab, the top chords, bottom chords, and web bars were Φ 10 ribbed bars, Φ 8 ribbed bars, and Φ 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. Avoid using air contents over 3% for interior slabs. • Basement floor slabs with integral footings must provide for 5000 psi concrete in that portion of the slab acting as a footing. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. By Concrete Construction Staff. S. The maximum size of reinforcement shall be No. If too much water was. These slabs are supported directly by the columns and have a completely flat soffit. If consolidation of plastic soils is determined to be a potential problem a suspended slab may be the only effective solution, in which. 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. last quarter of 2014, the prices i got for the rebars (12m lenght) are: 9mm deformed rebar - P110 10mm - P138 12mm - P205 16mm - P385. When arranging joints, skilled contractors will often use them to create an attractive diamond pattern. : Regarding reinforcement in slabs, please clarify whether you find a rebar spacing of 16 inches as good in reducing crack widths as a spacing of 6 or 8 inches, assuming there is the same total area of reinforcement in any case. less than around 0. Use of 5″ to 6″ (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads. DETAILING OF SLABS (For class held on 6th March 07) By Dr. 15% for mild steel bars. Rebar in patios, basement floors, footings and driveways may vary from size 3 to 6. There are two types of Grade slabs: Usually after casting Plinth beams. The formula is, Number of bars = (length ÷ spacing) + 1. You can use the concrete Rebar calculations to find the amount of. Post-tension cables. 8. The suspended reinforced concrete slab is tied into the external capping beam. ICF Foundation and One ICF Story – The sequencing here is to build the foundation walls first, place concrete, and then build the above-grade walls second. Steel fibers, at 1. 2 and 9. 7. (i) The maximum spacing between two parallel main reinforcing bars shall be 3dor 300mm or whichever is less, and. ˘ ˘ˇ Spacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. 5 Slabs on Grade - “the purpose of isolation joints in slabs on grade is to allow horizontal and vertical movement between the slab and adjoining structures such as walls, columns, footings, or specially loaded areas (machinery bases). Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm whichever is. reqd identifying no. Sudip Shrestha. However, if the concrete slab is meant to be the footing of a small structure, #4 rebar with a diameter of 1/2-inch should be used.