Floors shall be a minimum 3 1 / 2 inches (89 mm) thick (for expansive soils, see Section R403. 9 Factored loads Factored dead load = 3. 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. The rebar used for swimming pool construction is grade 40 deformed bars conforming to the standard of ASTM A615. com Ezekiel Enterprises, LLC 301 Mission Dr. 4 bar at the top and the bottom of the footing or one No. 2 consists of a 3-inch-thick reinforced concrete slab supported by steel beams. You can use the concrete Rebar calculations to find the amount of. Finite elements 1st example 2nd example 3rd example. 4. 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. 1 For longerfloor slab rebar' • ~ #4 19 mk402 "rll ~ ii i i i i i i i i i i i i i i i i i i i k '&y ih:' ii~. Second level 6 inches thick 9 feet tall. Two layers of steel bar reinforcement are needed for secondary containment floors because tank loads induce both positive and negative bending moments in the floor. Thus, the maximum center-to-center spacing, s, of the deformed longitudinal bars to limit crack widths is given by the following equation (see ACI Table 24. bars at each corner 38mm clear 400 slab opening omit trimmer bars where typ. 10. Two-Way Concrete Floor Slab with Beams Design and Detailing . Rebar. make sure rebar is in the center of the slab, or close to it. 00 m 14 over 6. Thank ForSubscribeLikesShare. Unless you are going to park a very large truck on the slab the 2'x2' oc #4 rebar is over kill IMHO. Round up the value of n to the next whole number to find the nominal rebar size required for that spacing. Why Does Concrete Require Rebar? Most concrete requires some type of reinforcement. A good compacted base below the concrete is equally important. That has held up great over the last 8 years, no cracks at all. Prior to the placement of reinforcement for concrete floor slab construction, inspect and check forms to confirm that the dimensions and the location of the concrete members conform to the structural plans. The spacing of the rebar is also determined by the weight and size of the slab. If you are trying to put a new concrete slab on your small-scale domestic project; 6mm (#19), 8mm (#25), and 10mm (#32) rebars will do the job nicely. The main reinforcement of the slab panel “A” is marked as (1). 3% (100As/bd < 0. 3. 3%. 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. 30% carbon cont ent and only. NOTE: Section 1907. The distribution bars are installed in the slab’s top layer, with a minimal cover distance of 15mm from the slab’s top. In that case, a layer of rebar near the bottom or at. Ordinarily, the rebar supplier details, fabricates, and delivers to the site, as required. The top cover under the General tab is used to define the rebar placement from the top of the slab. ( LF) Lapping Factor. g. , where a T-beam girder is supporting T-beams that in turn are supporting slabs, as shown in Figure 8. 🕑 Reading time: 1 minuteEstimation of steel reinforcement quantity for concrete slab, footing and column, beams etc. Provide the required spacing and diameter of the rebar. The spacing of the rebar should increase to between 18 and 24 inches apart for slabs between four and six inches thick. 3, No. 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. Check the Buckling Capacity of Rebar. t 12mm stirrups at 150mm ctrs Two terminated bars A A Elevation Section A-A Lsy. By: Olin Wade (Remodel or Move Stuff) The spacing of rebar in a slab depends on the purpose and size of the slab, as well as the climate in which it is being built. One-Way Joist Slab Concrete Floors are constructed in a range of sizes with conventional spans. spacing requirements and to repeat bar size and spacing as often as possible. (150 to 250 mm). Generally speaking, a 4-inch slab should include some form of reinforcement such as rebar or wire mesh. This is illustrated in Figure 1, where #5 bars are used in both the top (T) and bottom (B) layers in T wo-way slabs are generally defined as suspended slabs where the ratio of the long to the short side of a slab panel is 2 or less. Slab may be supported on walls or beams or columns. Use of 5″ to 6″ (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads. For this case, the lift should not be installed without written authorization from theIt has stood up to some really heavy equipment for 25 years. Learn the steps to pour a concrete floor inside an existing garage, house or shed. Total Volume of concrete in cubic yards. 8 ). 5h ≤ 450mm (in areas of concentrated loads 3h ≤ 400mm) Where h is the thickness of. Figure 1a: Joint Spacing in Meters. vided in the slab under the net. MTOTAL SLAB Rebar SPACING, LOCATION Shear THICKNESS Size (Ø) mm REMARKS kN-m. Concrete volume calculator plan view diagram. This is essential to know how much Rebar for the concrete slab is required. The maximum weight of fly ash, other pozzolans, silica fume, slag or blended cements that is included in concrete mixtures for garage floor slabs and for exterior porches, carport slabs and steps that will be exposed to deicing chemicals shall not exceed the percentages of the total weight of cementitious materials specified in Section 19. 2. 87 (round up to 13)Add one rebar. Elevated Slabs - Design. R403. Content intended for mature audiences. Slabs. And the rebar details of (1) is 10mmØ @ 8″ c/c. -i::= ::::i. In the Philippines, buildings face various environmental challenges such as strong typhoons, earthquakes, and floods. The design of one-way slab is simple and can be carried out easily. For slabs of septic tanks, you usually use #3 and #4 bars. Tendons today are seven high-strength steel wires wound together and placed inside a plastic duct. Step 1. Note: Cut the two side form boards 3 in. 1 in2. 2. STRENGTH REINFORCEMENT REBAR SPACING GP‐7 SERIES MODELS 4‐1/4” 3000 PSI / 28 Day Aging #6 Rebar 12 In. We can also pinpoint the depth of every object we locate in concrete with an accuracy of +/- 10-15%. 8 ). ÝBar arrangement in the floor slab begins 50mm from the slab wall side having constant spacing. Once the wood sheeting is down, add a covering of plastic. The 4″ slabs-on-grade are placed on a layer of. If you want, you can cut out of a section of the steel for testing too. Rebar Spacing for Concrete Slab. Concrete reinforcement can be either wire mesh or ½-inch (#4) steel rebar. 24-foot joint spacing. ÞArranged bars should be strong enough not to deflect when a person steps onmaximum spacing of reinforcement in both directions. (a) A flat plate which is a two-way slab supported on a column grid without the use of beams. Contact*: Severity*: Description*:Problem #3 – Shrinkage cracks that allow moisture to reach the rebar. The procedure: Lay up the first 4-foot height of wall. However, no matter how basic or complex. In addition, the spacing of the bars will also vary by the project. Since this is a patio, you could use 6x6 10/10 wire mesh instead of the rebar. 24-foot joint spacing. c. make sure rebar is in the center of the slab, or close to it. 10mm, 12mm, 16mm, 20mm. x 27 in. It has Spanish language descriptions, labels and diagrams and it also has default units in the metric system (SI). a) Slab depth does not exceed 250mm when the steel grade is 250. 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. This calculator uses 35% of balanced rebar area as the steel area for design of slab. Select the unit of dimension like meter, feet inch, etc. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. The provision of adequate reinforcement, slab thickness, and. A 6-mil (0. 2 and 9. e. 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 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. 2. The design of slabs for imposed loads and live loads is based on the type of the building. Stainless steel rebar. Compressible floor-covering materials that compress more than 1 / 32 inch (0. For residential buildings, a live load of 2000 to 3000 N/m 2 is used as per Indian standards. ( D) Depth of slab. 3 Storey Building: Larger diameter rebars, such as 16mm and 20mm, may be used to accommodate the. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. It simply means it contains steel. , edge beam dimensions = 14 in. 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. You will be able to add radiant floor heat any time. Joint spacing that is greater than 15 feet require the use of load transfer devices (dowels or diamond plates). The practice in which steel decks are used is known as composite floor decks. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. or >) The minimum floor thickness shall be 6 inches. Annex. Study Resources. This new slab design does not account for second floor installations or installations in a ground floor with a basement beneath. 00 m 4 3. There are four types of two-way slabs. 1. Properly compacted sub-grades can reduce needs for reinforcement – as well. , and unfactored live load = 100 psf. It’s not necessarily the placement of the rebar in the slab but the amount of rebar/rebar spacing and the depth of the slab. 45 to 1. 1 the spacing of links along the FULL HEIGHT shall not exceed 6 times diameter of smallest longitudinal bar or 150mm. 9836 – 18. E. 5 bars; There shall be a minimum clearance between parallel reinforcement bars of 2 1/2 inches;. In two-way construction,According to Clauses 8. Generally, #4 rebar (1/2 inch in diameter) is the most common size used for slab on grade applications. 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,. Crack Control – when crack widths are not checked by calculations No Further Checked Required. The top of the wall will need "hooks" in the rebar in order to fasten the wall to the garage slab. diameter), spaced at a maximum of 24 in. Report Application Issues or. For Greece, the. The main reinforcement of the slab panel “A” is marked as (1). Corner angle. ACPA Guide Specification | Dowel Bars for Concrete Street and Highway Pavement | ACPA M254-21 April 8, 2021 | Page 4 of 11 CSA-Z245. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. Wire mesh. Design drawings are used as a base for computing rebar quantity in different structural elements. Dowel bars transmit the weight from one slab to its neighboring slab. This is for a building with 1st floor SOG, 2nd floor slab, 3rd floor transfer slab and wood framing above. 2 Spacing s of transverse barsUse min 3/8 inch 24 inch on center rebar (wired together) not mesh. There are two types of Grade slabs: Usually after casting Plinth beams. In low- to. First, Get The Number Of Required Bars. Floor slabs can range from a simple residential basement slab to a heavy-duty industrial floor. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. There's no generally-accepted rule of thumb as to how to space rebar in a concrete slab. 00 m to 6. By Concrete Construction Staff. In t e r p r etations of the ACI 318 code re q u i r ements (Ref. Calculate for quantities of reinforcement bars and tie wire needed for your structural footing, slab, beam or column; Minimize your workload and finish your projects on time. Rebar in a concrete slab is crucial to any building. Basement slabs and interior slabs on grade, except garage floor slabs: 2,500: 2,500: 2,500 c: Basement walls, foundation walls, exterior walls and other vertical concrete work exposed to the weather: 2,500: 3,000 d:. Development length = 40d. 3. And the rebar details of (1) is 10mmØ @ 8″ c/c. Type and spacing of the control and construction joints. 2nd. The height of the slab bolster is determined by the required concrete protective cover. Cracking Unexpected cracking of concrete is a frequent cause of com-plaints. There should be a minimum of 3 inches of clear cover from the fi nished surface of the slab. Column spacings are 48 feet center to center. For 2,000 LBV soil or greater, two-story buildings may have 12-inch minimum wide footings. ** For alternate steel schedules and/or slab thickness determine As (end area of steel, in2) as shown below and use USDA NRCS Standard Drawing ES-46 to select bar size = and spacing that meets or exceeds the computed end area of steel. ”In particular, for slabs containing less than minimum quantities of conventional tensile reinforcement (i. It has a foot print of four tires about 10 inches by 10 inches time 4. Often, concrete contractors don’t have solid runs of rebar anyway. For slabs reinforced with rebar or wire mesh, this is considered fairly routine. The two design options are a ground-bearing slab, or a pile supported suspended slab. 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. 1R-92 (Ref. 4 size rebar (½ in. Concrete doesn't dry out; it undergoes a chemical curing process that creates a dry, solid mass. SLAB BOLSTER—Continuous bar support used to support bottom slab bars. Generally, a #4 (1/2″) diameter reinforcing bar with a minimum grade of 40 is used for standard residential slabs. Build the wall full height, place concrete continuously in 4-foot lifts, and consolidate each lift. Use wire mesh for driveways that are 4 to 5 inches thick, and rebar for those that are 5 inches or more. Spacing of mechanical shear transferring devices, s, where variable from one profile to another; and . 10. Two-Way Concrete Floor Slab with Beams Design and Detailing. 006 inch; 0. 2 and 9. For example, The #3 bar size is 3/8″ diameter of the solid section, the #4 bar size is 4/8″ diameter of the solid section, and the #5 bar size is 5/8″ diameter of the solid section. 7. Insert plate. Cracking can be the result of one or a combination of factors, such as drying shrinkage, thermal contraction, restraintRebar Development Length Calculator. However, there is no need to tie the garage slab to the new foundation, and in fact a strong case against doing so. The load needs, and the span of the slab decide the spacing, size, and placement of the bars. 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. 4, and No. The provision of adequate reinforcement, slab thickness, and proper. Nail one end to the braced form and use the calculated length of the diagonal to set the form at 90 degrees. worked on the rebar behavior inspection of a sustainable RC slab. HOUSE BUILDING IN THE PHILIPPINES - EPISODE 56: REBAR LAYOUT FOR C-JOIST SLAB Message us:Facebook: retir. For live loads of about 50 psf (2. , edge beam dimensions = 14 in. 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. Note: Unless otherwise specified, all code references for elevated slabs are to ACI 318-14/ACI 318-11. The simplest type of two-way slab to construct is known as a flat plate. Multiple layers of c r ossing bars cause these pro b - l e m s . 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. Concrete blocks made of sand-cement mortar can be used in place of the slab bolster. Detail A: “Snap Tie” (diagram upper left) is the simplest and is usually used for rebar in a flat horizontal position. However, this is the absolute minimum and applies only when there is no load on the concrete slab at all. Table 7-6. I was thinking of going with the same spacing. 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. 1: Calculate The Main bars. An older reinforced concrete design calculator that computes required steel area for T-beams and 1-way slabs can be found here. Compression is a force that squeezes or crushes, and tension is a force that pulls something apart. . 8 inches. 2. FLOOR SLABS M. 2. or slab change soffit typical detail for beam 400 dowel 250 300 (typ. 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. The rating your floor can withstand is also factored in. Steel shall be located within 2” of the top or the upper 1/3 of the slab. Rebar Spacing. 2 – Contraction joints, states the following: “ (d) Joint depth shall be a minimum of ¼ the slab thickness for formed or tooled joints, or dry-cut sawed joints in hardened concrete (e) Joint depth shall be a minimum of 1 in. (Imagine you are walking around the slab) Hit Undo Last to Undo last side. 40ft x 15ft dumpster pad, 8" thick with double mat of #4 rebar 16" OC Each way. No, you do not need rebar for a 4-inch slab of concrete on grade. The typical depth for rebar placement for slabs is 2-4 inches. Advertise Here. 5 Footing and slab construction. 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. Clear span of the two way slab = 5000 mm. 9 m in buildings with light wood-frame walls, floors and roofs, footing widths shall be determined according to. 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. Most homeowners can expect to pay between $4. Section 13. 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. I’m on the second floor and the floor is 6 inch concrete slab with I think at least 1 inch steel rebar as reinforcement. Level, straighten and brace the second form board. com) 3. /18 in. Concrete volume calculator plan view diagram. Generally, you do not need rebar for a 4-inch slab. . After pouring concrete walls, they are anywhere from 8 to 10 inches thick. 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. 4. Because our accuracy while scanning with GPR is so high, we. When arranging joints, skilled contractors will often use them to create an attractive diamond pattern. The evaluation of rebar spacing results shows that the maximum standard deviation for rebar spacing is 0. 11 in. Unit 571 New Smyrna Beach, FL 32128 386-882-EZCE(3923). Here, ∅ is the bar diameter. Floors shall be a minimum 3 1 / 2 inches (89 mm) thick (for expansive soils, see Section R403. Rebar Development Length Calculator is a web application that supports the design of post-installed rebar in concrete applications by calculating the necessary tension and compression development lengths required in accordance with ACI 318-19 / ACI 318-14. 5 kPa), column spacing typicallyRepeat this process until you’ve laid all the necessary rebar. Labor Costs. The fibers must be high quality and tested to verify consistent strength. Steel fibers, at 1. Spacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. 21 = 183. Larger areas, lower loads, and higher seismic zones. Concrete slabs-on-ground containing 6 × 6 W1. Rebar is tied together, using wire, to hold it in place. INSTRUCTIONS: Choose units and enter the following: ( L) Length of the slab. Welded wire. First, enter the concrete slab sizes: length = 6 m, width = 4 m. 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. less than around 0. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. , and unfactored live load = 100 psf. In some cases, concrete needs reinforcement with steel mesh. Heavy Loads. Grid length = Slab-length – (2 * edge-Rebar-spacing) The total length needed for Rebar is measured vertically and horizontally. Concrete slab reinforcement design and code checks can be performed based on the following codes: ACI 318-19. 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. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the slab. 1. C. REBAR SPACING: GP‐7 SERIES MODELS: 4‐1/​4" 3000 PSI / 28 Day Aging #6 Rebar:. #IScodes #Concrete #Concretetechnology Recent & Related Videos Concrete. In t e r p r etations of the ACI 318 code re q u i r ements (Ref. However, for post-tensioned (PT) slabs, this can be mistakenly regarded as difficult, expensive, and. This slab will have rolling fork lift loads. 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. 46 and $1. The typical depth for rebar placement for slabs is 2-4 inches. 83-6. The minimum Sub-Base thickness shall be as shown in the table. 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. The first step in getting reinforcement design for an elevated slab floor is defining design strip rules. The number ranges from 10-to. 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. 6. Locating conduits (plastic & metallic) and in-floor heating lines in concrete, or just below a slab-on-grade. 15% for mild steel bars. I have an exiting two way concrete slab in which it is required to introduce new openings. MAX and #5 top placed at center of slab" I installed the #3 dowels 12" apart and 6" into the existing surrounding floor. Here, ∅ is the bar diameter. : Theoretically there is no difference because the restraint to movement is the same in all cases. No, you do not need rebar for a 4-inch slab of concrete on grade. a) Slab depth does not exceed 250mm when the steel grade is 250. (I think someone touched on this) Your floor covers some span. of the bars. The top of the wall will need "hooks" in the rebar in order to fasten the wall to the garage slab. LL = 6. Most residential slabs contain. Make sure it is in the very center of the slab as if it is too close to the top or bottom it is also useless. Sixteen gauge wire is used to tie. 530 m Therefore, gross area of building = 201. For residential footing use, spacing depends on the type of footing you have. The three different sizes of rebar used for home projects are usually #3, #4, and #5. However, some specific rules and requirements need to be met. 3: Two-way slabs supported on four sides; Clause 6. 8. 75 to 3. Generally, rebar spacing in slab footings ranges from 12 to 24 inches, both for horizontal and vertical bars. For this case, the lift should not be. Parking Structure Fuctional Design Parking Structures:Recommended Practice For Design and Construction Table of Contents 2. Sand is filled at a height of 0. each way at center of slab construction joint for same shall not be more than 3000mm apart. And a cross-sectional area of 0. b. 10. 8 of the Florida Building Code,. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. Whether the frame is precast, cast-in-place, masonry, or structural steel it can be accompanied by a HollowCore floor slab system. #LonbicooltvUsing the search function should turn up a lot of info. Multiple layers of c r ossing bars cause these pro b - l e m s . x 20 in. 00 m to 6. The tendency is to lay rebar the way one’s. To be memb. 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. Epoxy coated rebar. See full list on everything-about-concrete. , S. Marine Plywood Requirement Area of each marine plywood = 2. For driveways and patios, #4 (1/2 inch diameter) rebar is a common. Some brands of forms have preformed chases that run the length of each. 1. 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. The main bars are usually positioned in the slab’s bottom layer, with a minimum cover distance of 20mm from the slab’s bottom. E. 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. With some limitations, reinforcement for slabs can be sized using the Subgrade Drag Theory in order to increase the spacing of control or construction joints. For beams, these distances are 300 mm, 180 mm and 150 mm for grades of main reinforcement of Fe 250, Fe 415 and Fe 500, respectively. 4 bars. Rebar comes in several types: Steel mesh, made up of steel wires that provide support to the concrete. Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. dustrial floor slab. But if the slab is a patio or driveway, it will need rebar. Corner cracking and joint faulting are reduced by using these bars. You can use regular fencing material with 2' x 4' or 2' x 6' mesh. #5 rebar on a 6X6 grid, No cracks in that, poured the same time as the slab in the heated addition. 5 rebar, then measure and mark for your dowels at a 18. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. In the case of the RCC slab, the maximum spacing between two secondary parallel wires should be 5D or 450 mm or whatever. I am pouring a slab for radiant heat next week and I have been given a variety of advice on whether or not to use rebar. Second, in cases where a T-beam is oriented so that it is parallel to the main slab reinforcement (e. 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. 5, which correspond to diameters of 3/8-inch, 1/2-inch, and 5/8-inch, respectively. 3. (not reducing for cover/spacing, etc. Figure 1 shows an example of a floor plan with a composite slab including supple - mental reinforcing bars. Also note while no. This steel runs vertically and should lap the same size reinforcing steel out of the footing. Finally, take a look at the calculation results: grid length = 5. The performance of the paving joint is enhanced by these bars. My understanding of slabs based on limited experience and a heck of a lot of reading here is:1. Enjoy the Rebar Calculator for Slab. 10%. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Design beams B1, B2, B3, B4, and B5. Click on Calculate button to get the total weight of the steel rod in the slab.