Concrete Floor Topping Thickness

The minimum thickness of a monolithic topping at any part should be 20 mm. The concrete topping should be approximately 1 8 inch 3 mm above the bottom of the screed. For bonded and unbonded concrete topping slab strength of concrete for concrete topping slab is governed by function of the slab.

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The concrete topping used should have a maximum slump of 75 mm.

Concrete floor topping thickness.

Commonly placed topping slab is in the range of 50 100 mm. Laying of topping concrete. The structural drawings will state a minimum thickness for the concrete topping perhaps 40mm. However if you need to resurface damaged concrete a 1 inch layer is a good amount.

Floor top stg is a standard traffic grade single component shrinkage compensated self leveling floor topping and underlayment that may be pumped or poured. It is too thin to use as a flooring just by itself. The day before you place concrete wet down the surface and keep it wet until you place concrete but don t have any standing water on the slab during placement. There aren t many reasons to have only a 1 inch thick concrete surface.

If no water absorption is seen then the topping concrete can be laid as done in normal process. Screed thickness should be approximately 25 mm but not less than 15 mm or more than 40 mm. Floor top stg is specially designed to smooth out uneven rough or minor deteriorated interior concrete floors. Usually steel fabric reinforcement mesh will be required in the concrete topping.

When a topping slab is used over precast members aci 117 90 standard specifications for tolerances for concrete construction and materials allows up to a 3 4 inch offset of top surfaces of adjacent elements in an erected position. Strike off the concrete topping with the vibratory screed. 30mpa for light duty 40 mpa for medium duty and 50 mpa for heavy duty. Given that the floor is interior the cracks between the existing concrete and the trenches for plumbing and electrical probably won t move.

The old surface is prepared so that the new concrete will adhere then the new cement is added. As defined above these are screeds and toppings that are applied at the time when the underlying concrete floor is placed. The topping mix that you mentioned is ok. However most precast concrete planks will have a built in upwards camber.

Based on the thickness and the requirement of the topping slab steel reinforcement is provided. The amount of camber will usually depend on the length of the plank.

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