Suspended Concrete Floor Slab Thickness

Anticipated loading requirements also play a part and change these numbers.

Suspended concrete floor slab thickness. So depending on what the slab needs to support will determine the thickness and configuration of the concrete. #2 The slabs are always 6" thick. The 6 inch suspended slab in detail 21 weighs 75 pounds per square foot but the formwork should be designed to carry 130-150 psf due to the weight of workers and equipment used during pour.

Does the ground bearing floor slab align with the Technical Summary Sheet TSS and foundation design?. It may form the floor of a basement, at ground level or at upper levels. His inspection showed that the other flats had a concrete slab of 35.5 to 40.5cm.

Suspended Concrete Garage Floor. Precast Garage Floor suspended slabs are set in place and the keyway joints are then grouted. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving (see below).

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 conditions. Installation of the first-floor slab system is simple and cost-effective. The floor may vary in thickness over certain parts, depending on ground conditions and the order in which the concrete slabs are laid.

The thinnest a concrete slab can be is about 2 inches. Many design methods are available, and superficially they can seem quite different. Suspended flooring construction, steel flooring, flooring contractors, flooring installation, Perth.Floortech Flooring Systems is a Western Australian company that specialises in top quality suspended flooring assembly.

Check it against the factored shear load on the slab, 0.85Vc > Vu. Remember that the strength of concrete is measured in megapascals (MPa) which are the recognised units used to measure the strength of materials. Slab on ground 1.4 Minimum thickness of Diaphragms.

Concrete slab 100mm thick with insulation, if any, laid above or below the slab;. Concrete Walls - Estimate volume in concrete walls;. Even though a thinner layer is cheaper, the cost to build a concrete walkway is largely determined by the size and length you prefer.

The slab is normally at least 100mm thick, cast from ready-mixed concrete (a relatively strong mix). The slab will be polished so the concrete needs to be suitable for that. The dimensions are 16,000mm x 6500mm x 300mm.

The top (steel) reinforcement is important. If the suspended slab is expected to conform to ACI 117-10, Specification for Tolerances for Concrete Construction and Materials, there are only a few relevant tolerances. The slab is free standing.

It will be typically reinforced, either by rebar or steel fibres. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Thin slabs (typically 100mm thick) receive adequate compaction through the placing, screeding and finishing operations.

Alternative Floor Slab Detail. Suspended precast floor panels can make clear spans over difficult terrain, with acoustic and thermal benefits over a timber floor, and allow speedy installation on site. If the shear strength is insufficient increase slab thickness until 0.85Vc > Vu.

It has all been properly engineered and approved by our certifier and council. As you can see the main portion of the slab is 100 mm or 4" and the footings are 0 mm or 8", you'd be throwing money away pouring such a slab as you posted. And ACI 302.IR-04, “Guide for Concrete Floor and Slab Construction.” ASCC concrete contractors will work with all parties in addressing these issues.

The mesh reinforcement in the slab is placed in the top with 1" covers. Floor slab - Designing Buildings Wiki - Share your construction industry knowledge. Ground bearing concrete floor slabs should be at least 100mm thick, (including monolithic screeds when applicable).

ACI 117-90, “Standard Specifications for Tolerances for Concrete Construction and Materials,” gives only two tolerances for these appli-cations:. Slab thickness from 1¾" to 6" 45mm to 152mm Easily integrates with Quad-Lock ICF system;. A standard residential driveway is commonly 4-6 inches thick concrete with re-enforced steel bars.

Mind you suspended is probably 50mm slab, 150mm void, 150mm joist. With either a dpm in accordance with. Some slabs have hollow channels running through them - these 'hollow core slabs' are used to help reduce weight, and also to allow cabling and piping to be run through the slab.

A residential garage normally is constructed on a 4 inch mono-lithic re-barred slab. (for slabs 12 in. Depending upon the type load coming upon the slab, the thickness is varied- Light Loads – For one to two light cars or trucks, the concrete should be at least four inches thick.

If you have any questions, contact your ASCC concrete contractor or the ASCC Technical Hotline at (800) 331-0668. Any up filling to be of hard, inert material. The suspended reinforced concrete slab is tied into the external capping beam at floor level.

These can vary in thickness from about 5 inches with beams close together supporting them, to 7 inches or even more. That is why concrete formwork for suspended slab has a lot more columns and beams compared to the normal residential floor framing. Calculate the effective depth of the slab and calculate the concrete shear strength of the concrete slab.

The design of suspended floors should conform to requirements of ACI 318 and ACI 421.1R. If the building already has air bricks, in order to ventilate existing floor voids, then ducting should be provided to allow air to pass through and into the void. They are normally pre-fabricated offsite, and transported by truck.

The floors are suspended concrete and an inspection by an engineer recently when the foundations were exposed revealed that the suspended concrete floor under my flat was between 27 to 30cm and showed a surface crack and eventual chip in the surface of the slab. Floor Joists - Capacities - Carrying capacities of domestic timber floor joists - Grade C - in metric units;. Parking slabs are thicker, up to 12" but have far more rebar.

Deflection of Composite Deck Slabs” in Concrete Construction, September 1997;. Utilizing a proven slab system our group slab partners can help with the construct of concrete flooring, suspended flooring, suspended concrete slabs, casting concrete slabs, construction and installing concrete slabs. Traditionally column spacings and floor spans in these buildings have been in the range of 6 to 9 metres, to both contain costs and simplify construction.

Slab thickness is a major factor in the cost of a concrete floor, so there’s often pressure, which can become intense, to make the slab as thin as possible. Hardcore bed as for clause 3.4.2;. Standard thickness of the garage floor slab used worldwide is 6 inches.

Some methods call on the designer to solve mathematical equations, while others rely on simplified load. Quality floor construction includes good subgrade compaction, even thickness slabs, low-slump concrete, straight bulkhead lines, and control cuts spaced 24 to 30 times the slab thickness. Suspended slabs are made of concrete and steel mesh, the same as a ground slab.

You need a fair bit of thickness for a new solid floor 150mm type 1, bit of sand blinding, DPM, 100 concrete slab, 70mm celetex (nb to building regs requirement so could be more), 70mm screed = 290mm reduced dig measured from underside of floor finish. The normal thickness used for reinforced concrete slabs in South Africa is 170 mm for small slabs, 255 mm for slabs larger than 5m x 5m and 340 mm thick for long-span slabs forming part of a beam and carrying heavier loads. Specific design requirements for concrete floor construction are found in ACI 360R for slabs-on-ground, ACI 223R for shrinkage-compensating concrete floors, and ACI 421.1R and 421.2R for suspended floors.

Section 4.4.1 indicates that deviation from the specified elevation is ±3/4 inch, but that’s only applicable on formed suspended slabs before the removal of shores. Yes / No Continues on reverse Ground bearing floor slabs General Is the proposed slab a minimum of 100mm thick Yes / No Note:. The thicker the material, the stronger it is.

The land is level and there is easy access. Thickening the structure along the perimeter by another will serve as an integral footing, adding strength where the loads are heaviest. This picture shows a typical raft slab which would be used for a basement or garage floor.

In the case of a suspended concrete floor, if the thickness is inadequate then a greater thickness is chosen and the process repeated until an appropriate thickness of slab is found which meets all of the design requirements. Ideally I would like to avoid beams, but I know locally (Missouri) it has been done with one or two steel W shape beams to support the slab. The floor spans between supports and will normally deflect under load to a dimension that is limited by the design used.

Refer to ACI 223 for procedures for the design and construction of shrinkage-compensating concrete slabs-on-ground. The slab is constructed on well compacted granular fill, crushed stone or marl. 1.3 Minimum thickness of Slab on the ground UBC recommends minimum thickness of Concrete floor slabs supported directly on the ground to be mm, whereas BCGBC4010A – Apply structural principles to residential low-rise constructions determined minimum thickness to be 100mm.

A concrete slab is a structural feature, usually of constant thickness, that can be used as a floor or a roof. We have specified a suspended concrete slab. A suspended slab (or structural slab) spans between supports and must be reinforced to resist bending moments calculated from statics based on the magnitude of load and span.

With or without a screed or floor finish. Depending on ground conditions, the slab may need strengthening with steel mesh or special fabric reinforcement. The fresh concrete needs to be ‘tamped’ as it’s poured to remove air bubbles and excess water.

Reduces floor mass dead load by up to 50%;. Deeper beams should be compacted;. Concrete Mixtures - Cement, sand and gravel mixtures;.

Generally speaking a concrete residential highrise is 7-8" slabs, office are 9-10" and hotels somewhere in between. Tolerances for the floors placed on these suspended systems are often misun-derstood. Some multi story buildings use pan-formed slabs, so the slab is structural and supports its own weight after the forms and shoring are removed.

For flatwork, such as slabs-on-grade and driveways, a minimum thickness of four inches is required, but increasing the thickness to five inches can add nearly 50 percent to the load-bearing capacity. Floors - Live Loads - Floors and minimum uniformly distributed. A suspended concrete floor is a floor slab where its perimeter is, or at least two of its opposite edges are, supported on walls, beams or columns that carry its self weight and imposed loading.

Typically, a pro applies thin layers on an area like a walkway. Any contractor or supervisor who isn’t sure about concrete specifications should consult a concrete technologist for advice. 3.4.4 Suspended timber floors The solum is brought to an even surface;.

Eliminates upto 50% of conventional shoring;. I measured the thickness of the roof deck by measuring down from the exterior, subtracting the parapet and the side-entry threshold curb, then measured from the garage floor to a small exposed area of the underside of the deck, did a little math to accomodate the garage floor slope to get a slab thickness of about 10". Floortech flooring procedures offers an innovative as well as superior alternative to traditional suspended concrete foundations.

No body would pour a 8'' slab for a basement. Common mistakes in concrete floor slab construction can be avoided with proper base preparation, mix design, placement, finishing, and curing. I'm designing a suspended concrete slab over a concrete basement walls for a house garage.

Concrete Slab Thickness - Recommended thickness of concrete slabs;. Do the floor joists under the concrete floor remain to support the floor, and are they sized to carry the dead and live loads, or is the concrete slab spanning from foundation to steel beam to foundations wall, the joists being only form-work which is removed?. According to South African estimators, the square meter pricing for a suspended first.

A slab-on-ground is supported on the subsoil and is usually reinforced with reinforcing bars or welded wire mesh. Minimal or no site waste. AS 3600 is a significant document defining the design requirements.

CONCRETE FLOOR AND SLAB CONSTRUCTION 302.1R-3 The design of slabs-on-ground should conform to the recommendations of ACI 360R. Chapter 5 addresses the design of concrete floors as it relates to their constructibility. AFTER Precast Garage Floor INSTALLATION Insert paper dam into Precast Garage Floor voids at least 6'' from each end.

Reduces structural requirements for foundations and walls;.