Tuesday, 17 January 2012


Rain starts and the problem of leakage from roof/ slab/terrace starts. From around many years the work of waterproofing is carried out in almost all part of the world. In India different type of the waterproofing treatment are carried out. I want to share different type of waterproofing treatment which i have done.we are expert in this type of job.

Different type of waterproofing.

  • Tar felt water proofing
  • Bitumen Membrane
  • Brick bat Coba
  • Injection grouts
  • Cementitious water proofing
  • Crystalline water proofing
  • Integral Waterproofing Compounds
  • Acrylic Based polymer coatings
  • Waterproof (wp) coating
  1. In olden days, hot bitumen with dongri cloth ( white khadi cloth) were carried out to stop leakage from the roof/terrace. This type of treatment is carried out during rainy season so that leakage can be stop temporary. This type of waterproofing last for only one rainy season.
  • Tarfelt treatment : Its becoming rare in modern days.It is Hessian based bituminous felt recommended for multi-purpose of roof and basement waterproofing. This felt is free from harmful moisture effects and produced through a adequate formulation and application, as per IS specification. This saturated Hessian felt is coated with oxidized bitumen compound.some of the branded name is S.T..P(shalimar tar product), tiki tar product. etc Depending on the number of layers used it is variously categorized as three later, five layer or seven layer tar felting treatment. It comes in 20m packing roll. It is highly recommended for waterproofing of A/c sheet roofing where the movement is so much and the joints are so large

Well the actual procedure to carry this type of treatment is as follow.

  1. Cleaning of the surface with broom/ wire brush and removing the dust particle, grease, oils.
  2. Applying water base primer to the clean surface with brush.
  3. The bitumen of type II grade 1 is to be melted.
  4. Apply a coat of hot bitumen to the surface, then lay tar felt sheet and keep pressing the tar felt with some wooden or hard foam. again apply a coat of hot bitumen over the sheet and fix another tar-felt sheet to make a sandwich, and finally a coat of hot bitumen over the second sheet. this is a 7 layer treatment.
  5. A pplying reflective coating red oxide on t op of the finished surface al l as per manufact urer`s specifications
  • APP membrane treatment:
  • Bitumen membrane Comes in roll form
  • Need flame to install
  • Cutting and welding has to be precise work
  • Suitable for Concrete surface

Procedure is as follow:

1. Starting at low point from the roof, unroll the APP modified membrane roll once the priming coat

is dried.

2. Align the APP modified membrane roll correctly & re-roll it half inlignment before torching.

3. Avoid shifting of the membrane while torching Use gas burner to heat substrate & underside to

softening points.

4. When the embossing disappears, roll forward & press firmly against substrate to bond from the

lower end towards the higher end.

5. Ensure sufficient bleed on side & end over laps.

6. Once the half of the roll is torched properly to the substrate, unroll the balance roll and repeat the


7. An overlap of 100-mm shall be maintained for all the continuing sides.

8. Heating shall be done on both the membranes to be overlapped and pressed firmly with the help

of round shape trowel.

9. The care shall be taken to leave no gap at any point in the overlapped area. If noticed, reheating

shall be done to seal it

10.The APP membranes shall be protected either with concrete screed laid to slope or by applying

bitumen based aluminium paint in 2 coats for the slopped roofs.

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