Mesh is set on chairs and placed over the entire floor area 1 to 2 inches above the top of the forms. 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. Unfortunately, rebar can cause extensive damage to construction tools if you are performing coring or concrete cutting work. The conditions are commonly related to reinforcement ratio, size of rebars, spacing of steel bars, size and spacing of lateral ties or spirals, thickness of concrete […]3. 2nd. 1. #5 rebar on a 6X6 grid, No cracks in that, poured the same time as the slab in the heated addition. UB 610 x 179_BP_Pinned. If the soil conditions on are not covered by this Part then additional guidance can be obtained from. mk . S. Cutting that rebar ain’t going to do shit, despite all the “engineers” comments to the contrary. If 1 span is 8,000mm, 4,000mm will be center part and add 40times (40d) + rebar thickness is the length of top rebar in center part & end. Two-Way Concrete Floor Slab with Beams Design and Detailing. roof and floor inertia forces only. 5 inches of spacing (18" + 1/2" diameter of the rebar). We would like to show you a description here but the site won’t allow us. 6 inches. In that case, a layer of rebar near the bottom or at. For M15 concrete, lever arm = 0. (I think someone touched on this) Your floor covers some span. In either case, blocks should be used under the reinforcement to keep centered. 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. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. , interior beam dimensions = 14 in. Rebar being #4 grade 60. In this video, you will learn the Spacing between the. Concrete slabs: Contractors often use the 1/8 rule for determining the size of steel for a slab. 15m and then Sand level is rammed. There's no generally-accepted rule of thumb as to how to space rebar in a concrete slab. ( D) Depth of slab. Minimum clear cover to reinforcements in slab depends on the. Unless you are going to park a very large truck on the slab the 2'x2' oc #4 rebar is over kill IMHO. Figure 5. For the footing, it usually comes between 16mm to 25mm dia depending upon the size of the footing and the reinforcement bar used in compression mesh. The main bars are usually positioned in the slab’s bottom layer, with a minimum cover distance of 20mm from the slab’s bottom. The second marker expresses the bar size and is demonstrated by a number. 3. 74 equals 1824 lbs per sq feet. 1) describes six common types of floor slab con-s t r uction. Generally, a #4 (1/2″) diameter reinforcing bar with a minimum grade of 40 is used for standard residential slabs. A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. For residential footing use, spacing depends on the type of footing you have. E. ACI 302. MTOTAL SLAB Rebar SPACING, LOCATION Shear THICKNESS Size (Ø) mm REMARKS kN-m. e. On average are required, for 100 square feet with 5 inches thick slab, 19 strips of 3/8” rods (30 ft each one), are 570 ft. dustrial floor slab. (1) ε = θ (h b + h s) L-L 1. Workmanship and jobsite conditions. our detail shows rebar from the top of footing to the second floor (extended above slab for as required for lap) and from 2nd to 3rd floor slab. 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). This steel runs vertically and should lap the same size reinforcing steel out of the footing. that is 2. Step 1. x 27 in. 4. Report Application Issues or. The type of rebar used in the construction of a given section of concrete will depend on several. SLAB REINFORCEMENT SIZE REINFORCEMENT SPACING ANCHOR ANCHOR Cutting that rebar ain’t going to do shit, despite all the “engineers” comments to the contrary. The floor has been designed with two mats of steel, 7 1/2" total concrete thickness and 50 ksi steel beams with a single row of shear studs on the beams. For these cases, the flat plate is economical for spans between 15 ft and 20 ft. There should be a minimum of 3 inches of clear cover from the fi nished surface of the slab. shear stresses at the columns and bending moments in the slab con-3 trol the design. 10) Deflection and end-slip behavior. The evaluation of rebar spacing results shows that the maximum standard deviation for rebar spacing is 0. 5 kPa), column spacing typicallyRepeat this process until you’ve laid all the necessary rebar. x 20 in. Minimum RCC beam size should not be less than 9″x 9″ (225MM X 225MM), with an additional slab thickness of 125 MM. Development length Ld = 45-d. 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. 8 inches. The most commonly used rebar sizes for slabs up to six inches thick are #5 and #4. Much of your need for reinforcement will be dictated by how well your site was prepared. Tie wire is used to hold rebar in place to ensure that when concrete is placed the bars do not shift out of position. 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. 3 bars may be used, for constructability and handling reasons it is common practice to use no. 1 Spacing s of transverse reinforcement in cast-in-place walls shall not exceed the lesser of 3h and 18 inches. This table is span based since the bottom reinforcement is designed span by span. 2) Where the supported joist span exceeds 4. 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. 525 mm. 6) Calculation of top rebar Please refer to the method in construction site as follows because it is very difficult to explain in theory. Multiple layers of c r ossing bars cause these pro b - l e m s . If the slab is more than 24 inches thick, #5 (#5/8 inch diameter) rebar may be required. The cross‐sectional area of one N28 bar is As = 620 mm2 and with N12 stirrups at 150 mm centres, Atr = 110 mm2. 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. Steel fibers, at 1. 1 of ACI 318-111 identifies a two-way slab as a slab system designed for flexure in more than one direction. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. Last year added on a 30 X 30 to the shop, 6" slab, with mesh. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Then, the new slab needs to be left alone. Most residential slabs contain. For multi sided slab, first draw the shape: 1: Hit Clear + Start and enter Side Length of first side to draw, then hit appropriate direction (Arrow) button to draw. Slabs, walls, joists: No. 2 and 9. Similar “uncontrolled” or “random. The minimum Sub-Base thickness shall be as shown in the table. Why? While concrete is very strong in some ways, it also has a few. Besana. 5% reinforcement (reproduced here as Table 1). 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. of main bars – One = [Lx ÷ bar. For this case, the lift should not be installed without written authorization from the building. and 6000 btu/hr heat loss in the second. Nail one end to the braced form and use the calculated length of the diagonal to set the form at 90 degrees. LIFT MODELS. We can also pinpoint the depth of every object we locate in concrete with an accuracy of +/- 10-15%. ”. However, the boilers I have been recommended is the Electro boiler (30,000. 8 ). or >) The minimum floor thickness shall be 6 inches. Check the Buckling Capacity of Rebar. I am confused about the grid. Figure 1b: Joint Spacing in Feet Contraction joints may be tooled into the concrete surface at the time of placement. then use 1/2 PEX tubing and create about 5 floor heating circuits, bring all of them to a convenient access point in the shop. Number of Required Bars Formula = (Length of slab / spacing) + 1. These new concrete slabs do not account for second floor installations or installations in a ground floor with a basement beneath. Larger diameter bar will allow a wider spacing of the bar, our designs went from 3/8 on 12 inches to 1/2 on 18 inch when we started to build pesticide storage facility's. 1 Storey Building: Typically, smaller diameter rebars like 10mm or 12mm might be suitable, depending on the specific design requirements. 5 Footing and slab construction. Purpose. R403. . Step-4: Rebar Calculation Process Of The Slab Panel-A 4. In the case of the RCC slab, the maximum spacing between two secondary parallel wires should be 5D or 450 mm or whatever. A rebar slab calculator is a tool used to determine the quantity and spacing of reinforcing bars (rebars) needed in a concrete slab. 40 (default) and 60 are common. 3. 4. then use 1/2 PEX tubing and create about 5 floor heating circuits, bring all of them to a convenient access point in the shop. Measure the cover depth of embedments. 2. The Rebar Calculator is now available in Spanish. Slabs. The following guidelines given below according to BS 7973-2:2001. 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. 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. ÞArranged bars should be strong enough not to deflect when a person steps onmaximum spacing of reinforcement in both directions. This guide identifies the various classes of floors based on use, construction design details, necessary site preparation, concrete type, and other related materials. 4 bar at the top and the bottom of the footing or one No. Welded wire. 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. For areas where heavy vehicles or equipment may be placed, our independent third-party engineers will specify rebar reinforcement for concrete slabs on grade. The three different sizes of rebar used for home projects are usually #3, #4, and #5. com Round Measurements To Running Bar Points (Length - Left to Right): Running Bar Points (Width - Top to Bottom): Calculate Rebar Quantity From Total Slab Area and Perimeter To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. You cut as 4,000mm +760mm = 4,760mm. 8. 2)(12 in. 2 m top bars @ discontinuous edge Compute temperature bars 250 Using 10 mm f bars:. 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. 53 m). 2. 2: Repeat and continue to draw complete (closed) shape. Deformed bars mean that the rebar must have protrusions that will help the bar to bond mechanically with the. For foundations that are taller than 8 feet and slabs thicker than 8 inches, the minimum spacing should range from 7. . The compaction UNDER the slab is more important than the thickness of the slab. Section 13. In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. With our rebar calculator, you can eliminate. If a concrete slab is 4 inches thick, the depth of the control joint should be 1 inch. The specified compressive strength of concrete shall be as set forth in Section R402. 87 (round up to 13)Add one rebar. 2 Spacing s of transverse barsUse min 3/8 inch 24 inch on center rebar (wired together) not mesh. If the slab is more than 24 inches thick, #5 (#5/8 inch diameter) rebar may be required. The thickened concrete slab. We would like to show you a description here but the site won’t allow us. 1. • Basement floor slabs with integral footings must provide for 5000 psi concrete in that portion of the slab acting as a footing. I was thinking of the following: basement wall 8 inches thick 10 feet high backfilled up to 7 to 8 feet. The span is 2. CONTROL JOINT SPACING. Add the third side. If the weight of each steel beam is 62 lb/ft, determine the dead load in lb/ft supported by any interior beam. Crazing is a result of poor surface curing and only visible in hard troweled slabs. , or 5 h, where h is the slab thickness. Total Volume of concrete in cubic yards. Post-tension cables. less than around 0. 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. For live loads of about 50 psf (2. Column spacings are 48 feet center to center. Carbon steel. 8 of the Florida Building Code,. 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. S. Parking Structure Fuctional Design Parking Structures:Recommended Practice For Design and Construction Table of Contents 2. Arivoli Jayaraman. Consequently, building such slabs requires rebar spacing knowledge. The more layers of rebar you have, the harder it becomes to properly vibrate the concrete. 2. Thickness of concrete slab depends on loads and size of the slab. ˘ ˘ˇSpacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. for concrete floor construction are found in ACI 360R for slabs-on-ground, ACI 223R for shrinkage-compensating concrete floors, and ACI 421. SCI P300 is a comprehensive guide for the design and construction of composite slabs and beams using steel decking. 4m x. e. square poured concrete beams and columns. The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm. The Building Structural Standard defines a two-way slab system as a concrete slab system in which two rebars are arranged in two directions regardless of the presence or absence of a beam that transmits a load to. Rebar mesh: Cut and lay 6-inch rebar mesh across the site, covering all areas except for a 3-inch band on the outside. Where, d is the diameter of the bar. For example, one-way slab thickness. ) (12 in. The number ranges from 10-to. 7. If you are using high shrinkage concrete, you might want to decrease the cut spacing. For the short side, 240 inches divided by 14 inches gives you 17 lengths of 20-foot rebar plus a bit left over. 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. 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. (Imagine you are walking around the slab) Hit Undo Last to Undo last side. 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. 3. Use of 5″ to 6″ (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads. Parking lots have most loads imposed on interior slabs sur-11. Concrete rebar calculator plan view diagram. 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. 5" 3,000 PSI / 28 Day Aging. FIrst, find number of rods required for main reinforcement and distribution. On average are required, for 10 square meter with 12cm thick slab, 19 strips of 3/8” rods (9ml each one), are 171 ml. 2. Q. The rating your floor can withstand is also factored in. -l. I did a finite element model and the remaining reinforcement seems enough after the slab is cut. The most common steel reinforcement or rebar sizes in residential construction are No. Ex. /18 in. In the process, install bar chairs (various types are available) in cores where vertical rebar must be installed. Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of this section or ACI 332. 11 in. Unit 571 New Smyrna Beach, FL 32128 386-882-EZCE(3923). Step-4: Rebar Calculation Process Of The Slab Panel-A 4. 87 d Spacing of bar = Design of Continuous Slab Suppose a slab is supported at the ends and also at intermediate points on beams, the maximum sagging and hogging moments to which the slab is subjected to due to uniformly distributed load, can be computed as follows: Let = intensity of dead load per square metre. 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. 21 = 183. 5 kPa), column spacing typically ranges from 15 to 25 ft (4. Average: Rebar in Concrete Slab Estimator. 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. E. x 20 in. 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. In some cases, concrete needs reinforcement with steel mesh. Normally, it is assumedchanges in deck slabs, and sloped slabs over beams. Minimum aging of new concrete slab: 28 days (cure time) Minimum thickness of concrete slab: See new slab table & figures below. , edge beam dimensions = 14 in. This configuration directs load transfer predominantly in a single direction toward the columns. This guide is not a standard nor a specification, and it is not intended to be included by refer-ence in construction contract documents; ACI 330. Input the number of mesh in slab rebar. 12% for HYSD bars and 0. 24-foot joint spacing. So, pathway slabs go under heavy loads continuously. Concrete volume calculator plan view diagram. MotorCity (Structural) 22 May 17 13:44. Minimum Top Rebar Spacing defined in the Slab Design Rules spreadsheet: Max Bot bar Spac: Maximum Bottom Rebar Spacing defined in the Slab Design Rules. #construction #Philippines #staircase #stair #stairs #stairsPhilippines#steelbar #rebar #stairrebarRebar details for stairs and slab ThicknessAmerican Concrete Institute—there's not much available free from ACI, but if you want the best information on concrete and concrete parking lots, ACI has it. Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. Use 2” rebar chairs to support the rebar in the center strata of the pad. Then insert 6-foot-long vertical rebars in the cores, properly positioning them in the rebar chairs. For the slab's longer dimension, you'll need 360 inches divided by 14, which gives you 25 plus a bit left over. In order to calculate this, you need to input the length and width of your slab. 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. ACI 318-14 Section 8. Once you input these values, you. The provision of adequate reinforcement, slab thickness, and. 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. . girder sides & slab on grade - 1 reinforced concrete beams 6 mm for every 4. If you are using rebar under the weight room, raise it on stools, tie it off in a 12" grid. We recommended to use 5″ rcc roof slab thickness 1, 2 and 3 storey building. Tie the rebar together. 376 lbs/ft or 0. For corrosion protection, however, most specifications require a minimum depth of concrete cover that usually ranges from 1 inch to 2 inches. When two slabs are moved together, the impact loading created by the slab is reduced. 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. 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. I generally use a minimum of 4 bars, with 2 bars of 12 MM thickness in the bottom of the beam, and 2 bars of 10 MM at the top of the beam. 1. Figure 1 shows an example of a floor plan with a composite slab including supple - mental reinforcing bars. (Imagine you are walking around the slab) Hit Undo Last to Undo last side. Rebar should be minimum Grade 40 reinforcing steel. For example, if you must splice between floors 2 and 3 of a building and you do so just above floor 2, then the construction will look like this: Pouring of column from floor 1 to 2 without the splicing rebar (but with protruding rebar awaiting the splice). 3%. , interior beam dimensions = 14 in. Note: Unless otherwise specified, all code references for elevated slabs are to ACI 318-14/ACI 318-11. 5. 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. 1 Required design elements—Following are the minimum items that should be addressed in the construction Rebar Spacing Basics. Check ACI 360R-10 Guide to design or slabs on ground. on center, but this will depend on the structural design. The support for reinforcing steel in floor slabs is shown in figure 7-24. A concrete slab costs between $4. For corrosion protection, however, most specifications require a minimum depth of concrete cover that usually ranges from 1 inch to 2 inches. 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. Avoid using air contents over 3% for interior slabs. Local code authorities often specify the type and placement of the reinforcement in a monolithic slab. 9mm deformed rebar for walls instead of 10mm. For the purpose of analysis and design, a unit of the slab is cut out at right angles to the supporting beams, shown in Figure-2, which may be considered as a rectangular beam. in concrete slabs. 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. 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. 0 pounds per cubic yard (0. 53 Compute moments At support: ( - ) M1 = 3. -i::= ::::i. In summary the design procedures for beams and floor slabs are similar with the following differences: (a) Minimum steel. Rebar is typically used to provide additional strength and rigidity to concrete slabs, so if the slab is intended. 5" of XPS foam board underneath, 1150 square feet, 7 feet below ground. As a building material, concrete is very strong in compression but relatively weak in tension. the calculator will give you the default spacing values (for rebar – rebar it’s 40cm, and for edge – grid it’s 8cm). Specify the spacings: rebar-rebar spacing = 40 cm, edge-grid spacing = 8 cm. 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. 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. . 3% (100As/bd < 0. Standard concrete floor slab thickness in residential construction is 4 inches. 2 consists of a 3-inch-thick reinforced concrete slab supported by steel beams. Ilang Araw Ang Pagbuhos Ng Simento? 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. 600-2 DETERMINATION OF BUILDING WIDTH A. The simplest type of two-way slab to construct is known as a flat plate. Rebar is typically made of different types of steel. #IScodes #Concrete #Concretetechnology Recent & Related Videos Concrete. 00 m to 6. Place the second bar parallel to the first bar and 1 inch beyond (see Figure 2). Reading time: 4 minutes. The minimum column size should not be less than 9 "x9". 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. 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. for slab depths up to 9 in. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. 60 per square foot for materials and labor. Use 3/8 min repair frame in the footing. Second level 6 inches thick 9 feet tall. For 2,000 LBV soil or greater, two-story buildings may have 12-inch minimum wide footings. 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). That is the best way to have good concrete in such a place. square columns and concrete block wall supporting 10in beams @ 12ft on centers front to back. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. ) = 0. Reduce evaporation over the slab by using a fog spray or slab cover. 73 Therefore, use 12 mm bars @ 0. Joints shall be spaced at 24 to 30 times the slab thickness but this need to be confirmed by a structural engineer. 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. 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. 46 and $1. ACI 360, "Design of Slabs-on-Grade", refers to this as a Type B slab. 00 m 4 3. The basic building block of this application is further known as a composite floor slab. The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm. 59 per square foot. 5 rebar, then measure and mark for your dowels at a 18. (150 to 250 mm). I have some question regarding the placement of the expansion joints. 3. Common Rebar Sizes. x 18 in. Wet your concrete after the pour. c. 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. If you are in a climate subjecting the floor to freezing, get air added to the concrete. 23 Total factored load = 6. 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. t 12mm stirrups at 150mm ctrs Two terminated bars A A Elevation Section A-A Lsy. The shear reinforcements are provided from the support. x 27 in. 00 m 4 3. I can't believe after being in this business for 12 years I've yet to pour a very long re-inforced concrete slab. 5 m) with mini-mum slab thicknesses of 6 to 10 in. Crack Control – when crack widths are not checked by calculations No Further Checked Required. An older reinforced concrete design calculator that computes required steel area for T-beams and 1-way slabs can be found here. Whether the frame is precast, cast-in-place, masonry, or structural steel it can be accompanied by a HollowCore floor slab system. 1 m) and post-tensioned spans of 13’-28’ (3. E. ( D) Depth of slab. Thank ForSubscribeLikesShare. Ordinarily, the rebar supplier details, fabricates, and delivers to the site, as required. For slabs of septic tanks, you usually use #3 and #4 bars. Figure B-10: Alternative Floor Slab Detail. AS3600-2009 P P Lsy. to 9. These slabs are supported directly by the columns and have a completely flat soffit.