Components of Bituminous Membrane

Components of Bituminous Membrane

Bituminous Membrane

The most widespread materials for the creation of the waterproofing layer are the polymer-bitumen roll-fed membranes. This is due to the relative simplicity of installation, the popularity of the technology, durability of the material and stability of the factory-set technical parameters. Polymer-bitumen membranes are commonly used for waterproofing of foundations, engineering structures, roads, bridge decks and flat roofs. These materials could also be used as an underlay for pitched roofs and as a vapour barrier.

The waterproofing membrane not only protects the internal premises from water penetrating inside, reducing their operating ability, disturbing the process equipment operation and worsening the microclimatic conditions indoors, but it also prevents the destruction of the foundation and supporting structures. Therefore, the correct selection and installation of the waterproofing membrane also ensure the durability of the whole facility.

Polymer-bitumen membranes undergo the effects of many unfavourable factors from the external environment. Changes in the surrounding temperature can cause deformations of the material and the base on which it is installed. The ability to withstand such deformations is the most important characteristic of roofing and waterproofing material and it depends on many components used in the production stage.

Polymer-bitumen Compound

The compound is a specially formulated mixture of bitumen and polymers. The main difference between compound types is the kind of polymer used:
APP

APP

APP polymer provides additional flow resistance that makes it possible to use the material in a very hot climate. The limitation is that the material is less elastic and flexible at low temperatures.
SBS

SBS

SBS polymer provides additional flexibility and dynamic resistance. It cannot be used in a very hot climate as a cap sheet membrane, because the polymer does not grant high flow resistance to the material.
Special anti-root additives can be added to the polymer-bitumen compound to make it resistant to root penetration and ensure the reliable waterproofing of green roofs and foundations.

Reinforcement

Polymer Film

Thin film for underside protection with graphics for installation guidance, melting during heating to ensure correct adhesion

Top Surface

Mineral Flakes

Mineral Flakes

Sand
Sand
Polyethylene
Polyethylene
Aluminium Foil
Aluminium Foil
Mineral Flakes
Mineral Flakes
Sand
Sand