1R). 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. The suspended reinforced concrete slab is tied into the external capping beam. It covers the principles, methods and best practices for various types of composite structures, including simply supported, continuous and cantilevered beams, and slabs with different decking profiles. The second marker expresses the bar size and is demonstrated by a number. Dig a min of 24 inch deep by 36 inch square footing below the point of connection to the equipment above the slab. ) slabs are plate elements used to form the floors of buildings. 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. 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. 2. 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. Reinforcing steel should be properly tied with wire to rigidly support it in its proper. The three different sizes of rebar used for home projects are usually #3, #4, and #5. 4, and No. Also, a small hole in the concrete will be totally fine, given the fact that there is a rebar grid. 9. Design of Floor Slabs (fc' = 28 MPa, fy = 276 MPa) Common design parameters: 0. Typically, once the concrete in the foundation wall has set, install the floor system. The diameter of bar generally used in slabs are: 6 mm, 8 mm, 10 mm, 12mm and 16mm. 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. bars at each corner 38mm clear 400 slab opening omit trimmer bars where typ. Once the concrete has gained strength to 2000 psi, typically within the 3 to 10 days recommended by PTI, the tendons are stressed. 5. A 6-mil. And the rebar details of (1) is 10mmØ @ 8″ c/c. . The 4″ slabs-on-grade are placed on a layer of. A. To calculate Total Area of a multi sided slab, first divide the shape into rectangles or squares. 9mm deformed rebar for walls instead of 10mm. ( rS) Rebar Size (2,3,4,5,6,7,8,9,10,11,12,14,16,18,20) Use Size "0" for. The shear reinforcements are provided from the support. 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. This is one of the types of concrete slabs. The article elaborates the elastic and inelastic methods for design of. 1. 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. In general, 6 inch (150mm) slab thickness is considered for residential and commercial buildings with reinforcement details as per design. , interior beam dimensions = 14 in. . A residential post-tensioned concrete slab will typically be 8 inches thick and use 3000 psi concrete. D bar or 10 mm if you are using Plain bars. Part of the building is 2 storeys high. c. Tie the rebar together. This table is span based since the bottom reinforcement is designed span by span. get your rebar grid down, i would use 1/2" on 12" center. Figure 1a: Joint Spacing in Meters. The distribution bars are installed in the slab’s top layer, with a minimal cover distance of 15mm from the slab’s top. get your rebar grid down, i would use 1/2" on 12" center. Just one 3/8 bar will qualify as reinforced. Rebar is typically used to provide additional strength and rigidity to concrete slabs, so if the slab is intended. 00 m shorter span one-way floor slabs under 3. 2 (ACI 318-11 Section 13. In addition, the spacing of the bars will also vary by the project. ”In particular, for slabs containing less than minimum quantities of conventional tensile reinforcement (i. The numbers range from #3 (smallest) to #18 (largest). Y. 64 mm) between longitudinal rebar 2 and 3, which is the same as the rebar construction and traditional tape measurement results. However, no matter how basic or complex. This calculator uses 35% of balanced rebar area as the steel area for design of slab. 376 lbs/ft or 0. , where a T-beam girder is supporting T-beams that in turn are supporting slabs, as shown in Figure 8. The size of the columns depends on the total load on the columns. Much of the time, the depth that finishers install control joints is less than what is normally recommended. • The slab is designed as a continuous slab, using theory of continuous beams (slabs), or the simplified ‘coefficient’ method (where applicable i. Standard concrete floor slab thickness in residential construction is 4 inches. 18 bar 11/2″. First, Get The Number Of Required Bars. 8 ). 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. Slab Reinforcement Two-way slabs are generally defined as suspended slabs whose ratio of long span to short span (bay length to width ratio) is less than two. Expert Guide to 2nd Floor. 4. 3rd. Select the SLAB1 property and click on the Modify/Show Section. 🕑 Reading time: 1 minute The design of reinforced concrete (RC) column is carried out by following certain procedures. 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″. There are two types of Grade slabs: Usually after casting Plinth beams. 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. Dynamic and/or oscillatory. The first step in getting reinforcement design for an elevated slab floor is defining design strip rules. The mesh reinforcement in the slab is placed in the top with 1" covers. Unfortunately, rebar can cause extensive damage to construction tools if you are performing coring or concrete cutting work. 1. Compressible floor-covering materials that compress more than 1 / 32 inch (0. Floors shall be a minimum 3 1 / 2 inches (89 mm) thick (for expansive soils, see Section R403. Elevated Slabs - Design. In general,. . 83-6. Minimum and Maximum Spacing between the Main and Secondary Steel Bars in Slab ISpacing of Steel bars. To define design strip rules, click the Slab Design Rules button on the Data Entry toolbar. 02 To control deflection, r. Modeling floor diaphragms. These provisions are not meant to prohibit the use. If the concrete slab in question is meant to be the footing of a house, then #5 rebar with a. The fibers must be high quality and tested to verify consistent strength. , interior beam dimensions = 14 in. Floor Under Solids or Semi- solids and Single Axle load (15,000 lbs. Measure the cover depth of embedments. SLAB BOLSTER—Continuous bar support used to support bottom slab bars. 36 Live load Canopy = 1. Use of 5″ to 6″ (125mm to 150mm) is recommended if the concrete will receive occasional heavy loads. Matthew Stuart, P. Main bars in the slabs should not be less than 8 mm if you are using the H. The specified compressive strength of concrete shall be as set forth in Section R402. ** 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. 3. 00 m 14 over 6. 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. or >) The minimum floor thickness shall be 6 inches. Ex. 00 m span 3. Thickness of concrete slab depends on loads and size of the slab. The no. 60 per square foot. t + DWhen a concrete slab is stressed by the post-tensioning method, it means the steel is being tensioned and the concrete is being compressed. 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. 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 mm) in thickness in the uncompressed state shall not extend beneath walls, partitions or columns, which are fastened to the floor. Free Reinforcement Calculator. Input all the dimensions in the input section of the above calculator. Finally, you pour the concrete into the molds. Deformed bars mean that the rebar must have protrusions that will help the bar to bond mechanically with the. 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 formula is, Number of bars = (length ÷ spacing) + 1. For slabs. Average: Rebar in Concrete Slab Estimator. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. Column spacings are 48 feet center to center. 2. Whether the frame is precast, cast-in-place, masonry, or structural steel it can be accompanied by a HollowCore floor slab system. Section 13. 1. Space joints (in feet) no more than 2-3 times the slab thickness (in inches). Ordinarily, the rebar supplier details, fabricates, and delivers to the site, as required. 4. Here, ∅ is the bar diameter. One-Way Slab Concrete Floors are constructed in a range of sizes with conventional spans between 6’-20’ (1. C. slab along the shorter span, 3mm per meter span. is crucial for the cost evaluation for the construction. See full list on everything-about-concrete. Rebar is typically made of different types of steel. Spacing of mechanical shear transferring devices, s, where variable from one profile to another; and . The Rebar and Concrete in a Slab calculator computes the total length and weight of rebar and the volume of concrete needed for a slab. A 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). 23 Total factored load = 6. Fabrication of rebars consists of cutting to length and required bending. 5 inches of spacing (18" + 1/2" diameter of the rebar). reinforcement for the bottom fibers of the composite slab. Size and spacing of rebar;secondary containment floor slabs on grade. Why Does Concrete Require Rebar? Most concrete requires some type of reinforcement. 2. 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. for slab depths up to 9 in. (I think someone touched on this) Your floor covers some span. Rebar spacing in a slab footer will depend on the size of the slab, the load it will support, and local codes. 4. 40ft x 15ft dumpster pad, 8" thick with double mat of #4 rebar 16" OC Each way. 73 per square foot, with an average cost of $6. 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. 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. (not reducing for cover/spacing, etc. ACI 302. Therefore net area of slab = 201. 5 to 7. 4 rebar in the upper part and one piece of No. 3. 40 (default) and 60 are common. The structural design of the concrete floor slab on-ground is dominated by the sub-grade conditions and the floor loadings. Detail B: “Wrap and Snap Tie” (diagram upper right) is normally used when tying vertical wall reinforcement to hold the bars securely into. for 500 MPa reinforcement it must be either 500PLUS® Rebar (Class N) or OneMesh500™ (Class L). 21 = 183. 3. Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. Methods used for finding slab thickness varies for different types of slabs. STRENGTH REINFORCEMENT REBAR SPACING GP‐7 SERIES MODELS 4‐1/4” 3000 PSI / 28 Day Aging #6 Rebar 12 In. Level, straighten and brace the second form board. Normally, it is assumedchanges in deck slabs, and sloped slabs over beams. 75 to 3. FIrst, find number of rods required for main reinforcement and distribution. The spacing of the rebar is also determined by the weight and size of the slab. and 6000 btu/hr heat loss in the second. 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. For instance, the ACI 318-19 specifies minimum slab thickness that satisfies deflection. Multiple layers of c r ossing bars cause these pro b - l e m s . The evaluation of rebar spacing results shows that the maximum standard deviation for rebar spacing is 0. 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. , the minimum footing width or area shall comply with Table 9. Second, in cases where a T-beam is oriented so that it is parallel to the main slab reinforcement (e. 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. This design is particularly effective for structures with consistent loads. Reinforcing bars that are spaced too far apart could result in relatively large flexural crack widths. The more layers of rebar you have, the harder it becomes to properly vibrate the concrete. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. T F 8. Vertical rebar every 16 inches. ( D) Depth of slab. Penetrations in PT slabs are possible when observing proper methods. 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 Grid Calculator. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. Avoid using air contents over 3% for interior slabs. 00 m 14 over 6. Grid length = Slab-length – (2 * edge-Rebar-spacing) The total length needed for Rebar is measured vertically and horizontally. some different types of rebar affect not only the str ength but also the longevity and durability of concrete structures. 00 m 7. In this video i will show you about 2nd Floor Slab Rebar. 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. , edge beam dimensions = 14 in. How thick should rebar be? Common Rebar Sizes Rebar in patios, basement floors, footings and driveways may vary from size 3 to 6. Build the wall full height, place concrete continuously in 4-foot lifts, and consolidate each lift. 1 Wall Reinforcements of SS and NS (a) Minimum Reinforcement in SS or NS walls - refer to TABLE 3. Note: Unless otherwise specified, all code references for elevated slabs are to ACI 318-14/ACI 318-11. We had twisted square bars in our 1911 second floor slab. MAX and #5 top placed at center of slab" I installed the #3 dowels 12" apart and 6" into the existing surrounding floor. Floor slabs can range from a simple residential basement slab to a heavy-duty industrial floor. 3. 1 of EC2, the recommended minimum spacing of reinforcing bars is 75 mm and 100 mm for laps. Larger areas, lower loads, and higher seismic zones. 5 m. ÝBar arrangement in the floor slab begins 50mm from the slab wall side having constant spacing. The ACI 318-19 provides a number of requirements regarding slab thickness, concrete cover, and reinforcement ratio which facilitate the design process. 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. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. 3 Slabs-on-ground with turned-down footings. Concrete blocks made of sand-cement mortar can be used in place of the slab bolster. The term "composite steel deck floor slab" is applied to systems in which the steel deck has some mechanical means of providing positive interlocking between the deck and the concrete. Wood blocks should never be used for this purpose. The top of the wall will need "hooks" in the rebar in order to fasten the wall to the garage slab. In this video i will show you about 2nd Floor Slab Rebar. 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. Minimum width and length of slab: See new slab table & figures below. Input the number of mesh in slab rebar. c) Slab reinforcement percentage less than 0. 24-foot joint spacing. According to Indian standard rcc concrete roof slab thickness in residential building construction is 4 inches (100mm). of the most advantageous location for a floor opening depends on the type of two-way slab you’re designing or evaluating. This guide identifies the various classes of floors based on use, construction design details, necessary site preparation, concrete type, and other related materials. Then, the new slab needs to be left alone. spacing requirements and to repeat bar size and spacing as often as possible. The existing rebar spacing is @ 16 in. Number of Required Bars Formula = (Length of slab / spacing) + 1. , or 5 h, where h is the slab thickness. Figure B-10: Alternative Floor Slab Detail. 3 Factored live load = 3. Minimum aging of new concrete slab: 28 days (cure time) Minimum thickness of concrete slab: See new slab table & figures below. 1 m) and post-tensioned spans of 13’-28’ (3. ) 400 dowel 400 250 %$56 $6 6+2:1 %277 %$56 # 2 & slab occurs mid-depth of slab [ /21* $7 723 bott. How far apart should rebar be spaced? approximately 12 inches Place rebar in a grid pattern with a spacing between bars of approximately 12 inches. It illustrates and explain. The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm. 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,. One-Way Joist Slab Concrete Floors are constructed in a range of sizes with conventional spans. G. Also note while no. This configuration directs load transfer predominantly in a single direction toward the columns. Check ACI 360R-10 Guide to design or slabs on ground. Post-tension cables. This type of slab is used on the Basement floor. 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. 1. MTOTAL SLAB Rebar SPACING, LOCATION Shear THICKNESS Size (Ø) mm REMARKS kN-m. 530 m Therefore, gross area of building = 201. (a) A flat plate which is a two-way slab supported on a column grid without the use of beams. Most residential slabs contain reinforcement of less than. , S. For example, a slab that is 6 inches thick might have rebar marked as size 6 or 3/4-inch. Minimum tensile strength of concrete: 4,000 PSI. First, Get The Number Of Required Bars. Except for Type F slabs, all slabs are expected to remain essentially uncracked under applied loads. 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. 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. 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. Rebar Spacing for Concrete Slab. Generally speaking, a 4-inch slab should include some form of reinforcement such as rebar or wire mesh. 00 m 7 cantilever reinforced concrete beams 18 mm for every 3. 15% for mild steel bars. For residential buildings, a live load of 2000 to 3000 N/m 2 is used as per Indian standards. b. Sand is filled at a height of 0. 3 Welded wire reinforcement (with wire size not greater than MW30 or MD30) used in slabs not exceeding 3 m in span shall be permitted to be curved from a point near the top of slab over the. 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). 2-25. Parking Structure Fuctional Design Parking Structures:Recommended Practice For Design and Construction Table of Contents 2. Technical Details of Steel Decking in Composite Floor Slabs. 5. x 27 in. With this calculator, you’re trying to calculate the dimensions of your rebar grid (length and width). I was thinking of the following: basement wall 8 inches thick 10 feet high backfilled up to 7 to 8 feet. However, some specific rules and requirements need to be met. Minimum RCC beam size should not be less than 9″x 9″ (225MM X 225MM), with an additional slab thickness of 125 MM. 1 Required design elements—Following are the minimum items that should be addressed in the construction Rebar Spacing Basics. Horizontal rebar starting at 12 inches and at 18 inch intervals after to the top. SCI P300 is a comprehensive guide for the design and construction of composite slabs and beams using steel decking. e. We recommended to use 5″ rcc roof slab thickness 1, 2 and 3 storey building. 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. No, you do not need rebar for a 4-inch slab of concrete on grade. A 4-inch-thick slab cast on the ground and in permanent contact with it will float and rebar is not required. 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. Properly compacted sub-grades can reduce needs for reinforcement – as well. 04% to 0. 1) provides the code basis. Types of Slab Construction ACI 360. 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. 3: Two-way slabs supported on four sides; Clause 6. girder sides & slab on grade - 1 reinforced concrete beams 6 mm for every 4. For live loads of about 50 psf (2. And a cross-sectional area of 0. The size of the rebar depends on the specific application, but typically #4, #5, #6, and #8 rebar are used. These slabs are supported directly by the columns and have a completely flat soffit. x 18 in. 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. 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. Some brands of forms have preformed chases that run the length of each. 3. Second level 6 inches thick 9 feet tall. 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. Fo r decades ACI 318 has re q u i r ed high- Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of ACI 332 and this section. Once the wood sheeting is down, add a covering of plastic. 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. 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. For corrosion protection, however, most specifications require a minimum depth of concrete cover that usually ranges from 1 inch to 2 inches. Here, ∅ is the bar diameter. Figure 2 illustrates the typical locations of the top and bottom bars within the composite slab cross-section. The Rebar Calculator is now available in Spanish. x 18 in. ˘ ˘ˇ Spacing (Rebar) A-7 4-1/2” 4000 psi with 28 day aging #6 rebar 12 in. The top of the wall will need "hooks" in the rebar in order to fasten the wall to the garage slab. 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. Total Volume of concrete in cubic yards. The spacing of such shrinkage-temperature steel cannot exceed 18 in. 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~. 5. One Way Slab Bar Bending Schedule Calculation. Concrete slabs-on-ground containing 6 × 6 W1. For single layer rebar, the design uses the top bar size, and spacing options. 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. 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. 5% reinforcement (reproduced here as Table 1). Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of this section or ACI 332. And rebar is sized by eights of an inch. L is the effective length of the beam and slab. make sure rebar is in the center of the slab, or close to it. REBAR SPACING: GP‐7 SERIES MODELS: 4‐1/​4" 3000 PSI / 28 Day Aging #6 Rebar:. 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. 4 bars in the middle third of the footing depth. 6. Floor slab of bottom-most SS or NS and floor slab of NS located above an SS: (i) Slab reinforcements at both external face and internal face shall be H13-. Draw also the typical beam detail showing the main. south d c rebar i 306" i #7,7/8" dia ---j r--rebar j. Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness. If you want to combine rods of two diameters, there would. Smaller projects like this usually have to sustain minimal loads and a lower tensile strength is more than enough. 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. 15m and then Sand level is rammed. 9 m in buildings with light wood-frame walls, floors and roofs, footing widths shall be determined according to. 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. Step-4: Rebar Calculation Process Of The Slab Panel-A 4. (150 to 250 mm). Column spacings are 48 feet center to center. 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. Concrete volume calculator plan view diagram. R403. The elevation to the top of the decking (bottom of the concrete waffle slab) for forming of the second floor above-grade slab is ___. ) slabs are plate elements used to form the floors of buildings. You'd really need to know how much steel was in it to get solid data. However, for post-tensioned (PT) slabs, this can be mistakenly regarded as difficult, expensive, and. In low- to. Reading time: 4 minutes. Contractors sometimes use the “1/8 Rule,” meaning the size of the rebar is 1/8 the thickness of the slab. Metallic and non-metallic pipes and conduits. This is for a building with 1st floor SOG, 2nd floor slab, 3rd floor transfer slab and wood framing above.