Method Statement of Screeding on Slab

method-statement of screeding / topping

This article will discuss Method Statement of Screeding works | Pouring on Slab | Work procedure for screed works | How to Pour Concrete Screed on Slab | Method Statement for Concrete Topping | Screeding Method | method statement for screed works | Floor Screeding Method

Scope of Works

This method statement of screed applications defines the activities and technique of screed pouring work including preparation, installation, and protection as per project specifications.

The purpose of this method statement is to carry out a systematic work execution for the screed pouring operation that will result in a safe execution procedure in strict compliance with the approved project specification and lifting procedure.

The project’s policy is to create a safe and healthy work environment. The following procedure must be followed in places where scaffolding is to be installed, removed, altered, transported, or accessible for any reason.

Activities

The following activities will be included in the screed pouring activities:

Screeding / pouring preparation 
Screeding / pouring activity
Curing arrangement

Purpose

The purpose of this document is to ensure that the project’s standards and specifications are effectively implemented during the screed pouring activities.

This work method statement covers the construction team with the necessary information about the unique project requirement as well as a procedure for working safely.

Communication

Based on a specific task assignment, the contents of this method statement must be communicated and shown to all concerned personnel. Signatures of the Site Engineer/Supervisor and subcontractors must be approved and recorded on the method statement.

The Site Engineer and HSE Officers will perform a pre-work briefing with all workers daily (at the start of each shift) based on the activities to be completed in the shift (all laborers will sign the pre-works briefing to verify that they have comprehended the activities and associated controls).

They will next conduct a site inspection to check that all of the measures are in place. The Work Supervisor will keep both the RAMS (Risk Assessment Method Statement) and the pre-works briefing on site for reference and evaluation.

Methodology of Screeding Construction

Handling and Storage

Portland cement, sand, and aggregate reinforcement must be ordered from approved sources/suppliers with all appropriate related documents.

The materials must be checked against the documentation once they have been unloaded to guarantee compliance.

The material shall be stocked in the storage yards/lay down area once the delivery order and other relevant paperwork have been stamped with acceptance by the Storekeeper.

Keep things dry and safe from weather and moisture by storing them indoors undercover. Prior to continuing, the Material Inspection Request (MIR) must be provided along with all applicable documentation.

Materials

For screed constructions, the following materials must be used.

Ordinary Portland cement is required.

Sand must be free of any adhering coatings or other debris. 10mm coarse aggregate, as specified in the project.

The water must be clean and fresh, suitable for residential use, and free of chemicals or additives that could impact the mix.

The use of an approved bonding agent is required. Sampling will be done according to the project specifications and a third-party laboratory that has been approved.

Only use approved methods and materials for water proofing.

Screed surface preparation

Any loose or unsuitable material, such as mortar, wood, paint, curing compound, oil, and grease, should be removed from the surface slab.

Ensure that all survey-related work is completed according to the most recent approved drawing. If the surface is smooth, concrete hacking with a chisel or hammering drill is advised, and the dust and loose material should be cleaned with a brush and high-pressure water jet to thoroughly erase the traces of the hacking.

Ensure that waterproofing work is executed in accordance with the most recent approved drawing, project specification, and approved manufacture product data-sheet.

Prior to proceeding with the screed, coordinate and discuss with other disciplines (mechanical/electrical/piping, etc.) to ensure that all discipline operations have been finished and inspected. As per the most recent approved drawing, reinforcement may be required.

Mixing

The grade C16/20 screed will be utilized, and the properties of the material are as follows, with two options:

The compressive strength of the mix design must be verified using a third-party test.

  • Ready-mix Screed (Before screeding, the ready mix plant and mix design must be approved.)
  • On-site mix Screed (The following mix ratio should be used for the site mix.) 20 MPa compressive strength 3/8 inch = 10mm coarse aggregate W/C (water to cement) ratio = 0.56 (cement sand aggregate) mixing ratio = 1:2:4
  • Mix Proportion – Refer to BS 8000: Part 9: Code of practice for cement: sand floor screeds and concrete floor toppings 1989, Table 2. Guidance on changes in mix proportion of cement: sand screeds when damp sand is used.

Screeding / Pouring Screed

For screed pouring, use the following mixture. ready-to-use (as per approved existing plant and mix design).

Site mix proportion (above site mix ratio). The initial inspection will be regarded as a mockup in order to get consultant and client approval of the actual scope of work.

Before pouring the screed, make sure the MEP (mechanical and electrical services, plumbing) approval has been secured.

Ready-mix Screed shall be delivered to the job site from an approved ready-mix factory in accordance with the approved mix design. (if the ready-mix screed is proposed to be used)

Ensure that all measuring equipment and a mechanical mixer are available to manage the mixing ratio and that a supervisor supervises the mixing operation according to the permitted mixing ratio. The concrete screed will be transported from the portable mixer to the casting area using wheelbarrows.

The screed should be poured straight from the mixer using its lever and tilting capabilities in large or open areas such as lobbies, retail areas, and parking lots. Using hand fork shovels and pavers, distribute the screed and push it towards the corners.

Install all embedded items prior to screeding operation.

Damp the surface with water prior to starting placing of mortar screed. However, free water shall be removed from the top of the surfaces.

After pouring and spreading the screed, it should be tapped with a flat trowel and an aluminum straight edge to ensure that it is level. Compact power trowel (helicopter trowel) shall be employed to tackle time measures in big and open regions.

To establish extra bonding between concrete slabs and screed and to prevent hollow sounds or cracks, a bonding agent should be put to the direct concrete surface.

The bonding agent must be applied according to the technical data sheet for the permitted material.

Screed Thickness: 60mm

Nominal: 50mm (+/-15mm slab deflection allowance). 65 mm minimum 75mm maximum.

Use narrow strips of screed materials, placed and compacted to the finished level to obtain the level of the screed

Curing

Wind, draughts, and direct sunlight should all be avoided. Right after laying down. Cover the finished screed with burlap and polythene sheet for at least 7 days to cure.

Handover and Cleaning

The area will be completely cleaned once all of the events have been done. A “Request for Inspection” will be raised for acceptance once the cleaning is completed and accepted.

Maintenance of Screed Surfaces

The Safety Engineer is responsible for ensuring that all areas of safety are maintained. All of the site sites are assigned to safety assistants for housekeeping.

All demolished/removed materials must be deposited in a single designated area for pick-up and removal from the site.

Work Tools and Equipment

Hand Tools
Wheel Barrow
Portable Concrete Mixer
Concrete pump
Vibrator
Air Compressor
Trowel
Aluminum Straight Edge
Fork Shovel
Survey Equipment
Instruments for measuring (for cement sand, aggregate, and water)

During the mobilization stage, the above-mentioned equipment will be assigned according to the needs of each job.

Handling and Storage

A program for environmental, health, and safety requirements must include the proper storage of hazardous chemicals. To comply with various rules, chemical storage facilities must meet specific minimum standards. Stores must adhere to many requirements that include safe storage:

Maintaining a current chemical inventory chemical labeling that separates incompatible chemicals Providing distinct storage.

Storage should be sheltered from direct sunlight and clear of any ignition sources.
Provide a proper fire extinguisher and appropriate warning signs. There should be no smoking or open flames near the fuel.

Vapor should not be inhaled. Read the fuel’s material safety data sheet. Manually lifting the container is not recommended. Make sure you have the right funnel. Check for any leaks.

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Tips on screeding concrete for beginners

Takeaways – Screeding Works

What is the process of screeding?

A screed is a long length of straight two-by-four board or an aluminum bar manufactured specifically for the purpose of laying concrete. Screeding is done by drawing the tool across the wet concrete surface, regardless of the instrument utilized.

How do you screed a floor step by step?

Step-by-Step Screeding Instructions:

  • Divide your floor area through leveling strips. Divide your floor into parts to begin the screeding procedure. The tubular pipe has to be used as a leveling guide and supported completely.
  • Make sure the floor has to be sound surfaced and cleaned prior to screeding.
  • Apply a screed layer.
  • Using screed to level a floor to the correct elevation.
  • Repeat the process. 
  • Float the screed.
  • Cure the finished screed.
  • Allow the floor to dry.

What is the purpose of screed?

The primary purpose of the screed, which is made up of one part cement and three to five parts sand or ready-mix delivered, is to create a smooth and level surface on which to apply your chosen floor finish. The screed’s thickness helps it to absorb typical variations in the flatness and levelness of the base it is laid on. If necessary, the screed can also be reinforced with wire mesh.

Various types of Screed

Screed is classified in several ways. We utilized the BS8204 and BS EN 13318 designations for these types.

  • Leveling screed – This is a type of screed that is used to provide a smooth and level surface for the installation of flooring materials. The structural performance of the floor is unaffected by the leveling screed.
  • Wearing screed – Wearing screed, often known as a high-strength concrete topping, is used as flooring. It can be utilized as a structural topping as well.
  • Bonded Screed – Screed that is utilized to maximize bonding potential on mechanically prepared substrates.
  • Unbonded screed – To prevent it from bonding with the substrate, the screed is separated from it by a membrane.
  • Floating screed – A form of unbonded screed (screed that is laid onto insulation).

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