About APP Modified Membrane Sheet

APP membrane is a plastomeric waterproofing membrane, manufactured from a rich mixture of bitumen and selected polymers (Atactic Poly Propylene) blended together to obtain excellent heat & UV resistance and waterproofing properties. The polymerized bitumen is coated on to a dimensionally stable reinforcement core of non woven spun bond polyester rot-proof fabric. The membrane has excellent mechanical ‘properties and is highly resistant to fatigue and is designed for use in structures exposed to high temperatures. Available in 2mm,3mm & 4mm.

Advantages

  •     Excellent resistance to  water & vapor pressure.
  •     Good heat resistance, life of 12 to 15 yrs
  •     Can accommodate. structural movements because of excellent tensile strength and  flexibility.
  •     High puncture and fatigue resistance.
  •     High tensile and tear strengths.
  •     Can be easily maintained, No alteration required, light weight treatment.
Procedure of Membrane Waterproofing

SURFACE PREPARATION
The surface shall be cleaned thoroughly of all contaminants like dust, traces of curing compound, oil and grease. All surface imperfections and protrusions shall be removed and repaired. Structurally unsound and friable concrete must be removed and repaired with a suitable repair mortar.

PRIMING
Solvent based bituminous primer shall be applied to a clean and dry surface. The viscosity of the primer is low, so it easily penetrates into the concrete pores which promote the adhesion between the membrane and the concrete surface. In addition to that the primer also acts as a binder for the dust which gets accumulated on the concrete surface even after cleaning.

ALIGNMENT
The membrane sheet are aligned from the lower slope point or drainage side towards top level of the slope from all sides so the flow of water is over or parallel to the plies, but never against the lap. Parapet walls and balcony terrace are also included for complete isolation.

TORCHING
APP membranes are installed by Torch method using commercial LPG Gas cylinder and gas torch.

CARPET FINISH
After installation of membrane the sides and overlaps are sealed with trowel to attain a carpet finish single layer look

FINAL FINISH SILVER PAINT
Silver paint is coated over the treatment to prevent the treatment from absorbing heat, preventing penetration of UV rays and to minimize cooling load.

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