Method of Statement Template for Polyurea Waterproofing Work.
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Method of Statement Template for Polyurea Waterproofing Work.

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Method of Statement Template for Polyurea Waterproofing Work.


Scope of Work.

The purpose of this Method of Statement for Polyurea for waterproofing  Works is to outline the materials and labor required to undertake the works in a safe and controlled manner,  compiling with relevant legislation, standards, and codes of practice etc.  

The method statement shall be briefed to all appropriate operatives to ensure that they are aware of the sequence  of activities and any Client/Consultant project specific requirements.  

A constant monitoring and supervision duty shall be undertaken by main contractor to ensure work activities are carried out  in accordance with the method statement. Any irregularities shall be immediately actioned.  

This method statement describes the working procedures for Polyurea for Waterproofing and all related activities. This will include surface preparation, application, Water Leak testing.  

General.  

Prior to works commencing, the Site Engineer shall ensure that the following activities have been  

completed and signed-off by the Consultant:  

Drawing must be approved for construction by the Consultant.  

Materials Submittals (Wet Areas & Attic slab) are approved by consultant.  

MEP conduits and accessories lay out and installations has been approved by consultant.  

Method of statement was approved by consultant.  

The Site Engineer shall ensure that the necessary Statutory Authorities approvals have been received.  


Reference.  

  •  Approved drawings for construction  
  •  Contract specification Section   
  •  Approve project quality & safety plan.  
  •  Approved Material Submittal.  
  •  Approved Method Statement  

Surface Preparation.

Conduct visual inspection for any defects prior to the coating.  

Prior to starting preparation, close the area to be prepared to all traffic and other trades.  

Protrusion and other sharp elements from the substrate to be removed. 

Surface to be prepared with high strength repair mortar and to be grinded to have a proper surface to apply the floor coat.   

Angle fillet shall be provided at all the corners. 

Required clearances to be obtained from the other trades prior to start coating.  
Remove all surface laitance, oil, grease, or any defective concrete that will reduce the bond of the coating.

If any part of the floor is contaminated by oil, grease or fat, the contamination should be removed before other forms of preparation are undertaken.
  
Surface irregularities must be ground down or filled out with repair materials. 
 

Prepare the concrete substrate using the chosen method, removing all weak or friable laitance and concrete. The finished surface should have the texture of fine to medium grade sandpaper.   

Surface defects such as shrinkage cracks, blow holes, minor honeycombing, minor damage to joint arises etc. shall be filled. 

Priming. 

Mixing: -  

  • Stir the base and hardener separately.   
  • If settling is observed in the base or hardener, loosen the settled material with the help of hand stirrer followed by power driven stirrer for quick homogeneous mixing.   
  • Mix hardener gradually into the base under continuous stirring as per stated mixing ratio.  
  • Apply after induction time and before expiration of pot life  

Application.

Mix the A and B components of together until it is free of streaks. Apply the mixed to the substrate, using a medium pile roller depending on the absorption of the substrate.  

Apply the mixed APCOFLOR HFP 120 to the substrate, using a medium pile roller depending on the absorption of the substrate. Dry / matt areas must be re-primed.  


The coverage would vary significantly based on the nature of the concrete surface. 
  
On porous surface where the primer is absorbed quickly leaving dry patches, a second coat is recommended.   

Antiskid Application.


A non-slip surface can be achieved by broadcasting approx. 1Kg/ M2 of  Nonslip aggregate (Medium) to the primer Whilst still wet.  

Primer application should be dry for at least 04 hours prior to commencing of Polyurea application.    


Polyurea Application.

Upon completion of Primer and Antiskid application, Polyurea system application shall commence where a combination of  Component-A ( MDI Prepolymer ) & Component-B (Mixture of  Poluether amine & Polyol) is sprayed onto the prepared up to a thickness of 2mm, using evolution combination equipment.   

Apply Polyurea at a consistent rate using a standard crosshatch spray pattern, with a minimum of 2 alternate directional passes for complete coverage, at the required application coverage total wet film thickness of 2mm to the horizontal & Vertical surface of areas.  

Allow the applied Polyurea coating to dry for minimum curing period of 04Hours Prior to proceeding with the Water test.  



Water Test.

Carry out a visual check of the Polyurea application works for any possible damages due to movement of men before filling water. 
 
Pour clean water (Should be free of any toxic / salt contents) up to a height of minimum 50mm at the highest point.  

Retain the water for 24hours.   

Check for leak / dampness. 
  
If there is leakage found, remove the water, and allow the area surface to dry.  
Search for the spots from where water enters the areas and carry out additional coating to rectify the week areas and again carry out works as mentioned above.  
 
This is repeated till a completely leak-proof installation is obtained.  


Laying of Separation Layer.


Laying of Separation Layer (Non-Woven Polyester Geotextile) over the Horizontal & Vertical Polyurea  Coating.  

It should be prevented from wind uplift by putting some weight.  

Other finishes by Main Contractor  



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