How to do Waterproofing On Terrace Floor ?

How to do Water Proofing On Terrace Floor & Water Tank

                                                                                                                                  

INTRODUCTION / SCOPE

The purpose of the application of waterproofing is to prevent the water to percolate or penetrate into any water susceptible concrete members.

OBJECT:

- To ensure all concrete members should be water tight 

PRINCIPLE

Concrete is highly susceptible to water penetration. Microstructure of concrete has air voids through which water can percolate and pass through by forming capillaries. Water if percolates would rust the steel reinforcement deteriorating the strength on concrete

MATERIAL

Cement, Sand, Water proofing compound, Bitumen (VG-10) 80/100 , Clay Brick tile, Good soil, Anti-termite chemical, Cow Dung , Bhoosa,  Fire Wood, keroscene oil

APPARATUS / EQUIPMENT

 Trowel, Tagadi, Brush, Chisel, Hammer, Wire brush, 

HEALTH AND SAFETY PROVISION

- All works shall comply with safety procedure

- All field personnel will use PPE

 MUD PHUSKA

PREPARATORY WORK:

•  Plaster of parapet, Mumty machine room ,Water tank, Expansion joint treatment at terrace level must be completed before start of water proofing
• Scaffolding or left out material should be removed
• Any debris or deposit on the surface should be removed.
• The surface must be thoroughly cleaned and free from dust, dirt loose materials, oil or grease.
• Level should be marked on parapet minimum 600 above terrace
• All rain water pipe is to be fixed
• Ridge line to be marked

 PROCEDURE OR METHODOLOGY:

• Convex gola of 1:2:4 cement concrete with water proofing compound shall be prepared along parapet, mumty and shaft wall.
• Uniform layer of bitumen(VG-10) shall be applied on terrace. Painted with hot bitumen of approved quality penetration 80/100  or equivalent @1.7Kg/Sqm. Bitumen shall be applied on parapet upto a height of  100mm above finish floor level.
• Good soil shall be laid in desired slope with minimum thickness of 75 mm.
• Compact the laid soil with wooden rammer.
• Do ATT after completion of compaction.
• Prepare a homogenous mix of good soil , cow dung & bhusa in ratio 8:1:1.
• Spread homogenous mix over compacted soil, thickness shall not be less than 25mm
• Allow surface to air dry till cracks appear
• Fill the cracks with the same homogenous mix
• Lay the brick tile over dry surface of homogeneous mix with the help of mud mortar
• Joints in brick tiles shall not be less than 6 mm.
• Joint of parapet and tile surface should be treated with concave gola.
• Pointing of brick tiles shall be carried out with 1:4 cement mortar
• Prepare khurra at RWP location

INSPECTION

§  80:20 ratio of bitumen and kerosene is to be maintained during boiling

§  Bitumen shall be applied on roof surface between 180°C-190°C.

§  Slab should be dry before application of bitumen.

§  Level is marked on walls before start of work

§  Bitumen shall not have any air voids

§  Soil should contain Optimum Moisture Content before filling

§  The surface of finished roof shall be kept wet for a period of 7 days.