This method statement covers the detailed procedure to be followed for screeds/topping operation above water proofing in toilet, roof slab and raft slab.
Method statement also covers the screeding operation below tiling works in concrete slabs wherever necessary.
This floor screeding procedure shall be read in conjunction with contract civil specifications as applicable.
The purpose of this procedure is to define how screeds/toppings shall be carried out under controlled conditions for achieving the best quality workmanship.
Below is list of necessary tools and equipment for performing the screed activities.
- Air compressor
- Brush
- Concrete Pump
- Trowel, Tamper
- Shovel
- Hand float
- Vibrating beam
- Power float
REFERENCES
Contract specification
Contract / Tender Drawings
Approved shop drawings
Material approval
Project Quality Plan
DEFINITIONS
QA/QC: Quality Assurance and Quality Control
ITP: Inspection and Test Plan
IR: Inspection Request
Engineer: Consultant’s Representative
Roles and Responsibilities
Project Director/Construction Manager:
The Project Director/Construction Manager is responsible for the implementation of this Method Statement and all relevant standards.
Project Director/Construction Manager shall ensure that the key personnel are also well aware of the specification requirements.
The Project Director/Construction Manager shall ensure that all resources like Manpower, Material and Equipment are available to carry out the work as planned and without any delay or confusions.
Project Engineer:
The Project Engineer is responsible to carry out the work as per the method statement, specification and approved drawings.
Project Engineer shall ensure that the resources are available to carry out the works as scheduled.
The Project Engineer shall be available at site full time for the execution of works as per schedule and specification.
QA/QC Engineer:
The QA/QC Engineer is responsible for the effective monitoring, implementation & documentation of QA/QC Procedures as per the project quality plan.
QA/QC Engineer shall ensure the implementation of all the relevant ITP, checklists and method statements.
The QA/QC Engineer shall ensure that all the approvals are available for the safe movements of works.
Foreman:
The Foreman is responsible to carry out the work as per the Method Statement, Specification and Approved Drawings.
Foreman shall be available at site full time for the execution of works.
Surveyor:
The Surveyor shall ensure that all the survey related works carried out as per the approved drawings.
Surveyor shall ensure that setting out and level are carried out with theodolite, Total station and dumpy level.
For all survey related items he shall be available at site full time.
Safety Officer:
HSE officer is responsible for the effective implementation of safety procedures as per the project HSE plan.
Safety Officer shall ensure that all safety precautions are in place, and personnel on site are using the required protective equipment.
Project safety officer shall conduct tool box meeting before the execution of works.
The Safety officer shall be available at site full time for the execution of works.
General Requirements for Screeding Works
All the materials shall be in accordance with the approved material submittals and any other related approvals i.e. samples etc.
Manpower requirements such as Project manager, Project Engineer, Foreman, Surveyor, skilled labour and helper will be available depending upon the site requirements.
The works shall be carried out as per the approved sequence or program of work.
Screeding Method of Statement
General
All the related documents such as method statements, mix proportion etc. must be approved and available upon request.
Free water shall be removed from the sub floor.
Check that the Mechanical and Electrical services under screed has been completed, inspected, approved and protected as per the drawing/specification.
Screed shall be laid with minimum 50 mm thickness.
Curing arrangement shall be done as per the requirements.
For the screed works below raft slabs ensure the maintenance of dewatering system (if it is required.)
Ensure water proofing as per the approved method statement for waterproofing and materials only.
Workmanship
Level guides shall be installed at proper intervals.
The surface of the sub-floor shall be thoroughly cleaned and prepared to ensure a good bond.
Clean and dry the surface prior to screeds application.
Mix materials thoroughly to a uniform consistency and use while sufficiently plastic for full compaction.
For the screed above the water proofing it will be spread and compact carefully without any damage to membrane.
Dense screeds and toppings shall be fully compacted by vibrating beam, pan vibrator or hand as per the site condition.
In screeds over expansion joints in base, the joints shall be filled with bitumen impregnated board joint filler placed to full depth and finished flush with surface.
After completion of casting, enough number of workers must be available for the finishing works, cleaning and protection.
As soon as the screeds/toppings have set it shall be covered with polythene sheet and kept in position for required number of days as suggested by the Engineer.
Surface hardener and sealer shall be applied if needed as per the manufacturer’s recommendations.
All material control and screeds/toppings activities shall be controlled as per the approved Project Quality Plan and Quality Control Procedure.
All work places will be cleaned from waste materials ensuring clean and healthy work environment, additionally ensure that access and egress are always free of obstacles etc. for the emergency evacuations.
All works shall be controlled as per the health and safety procedures, workers will wear mandatory PPE as per work requirements.
Safety procedures are to be considered before, through and after the completion of the work to avoid any possibility of danger to humans or the construction elements.