BITUMEN MEMBRANES

Roof waterproofing

Reinforced concrete and concrete structures are exposed to water and moisture. Water inside the structure causes reinforcement corrosion and concrete damage. In addition, water penetrating inside the structure shortens its service life.

Asphalt waterproofing is the first and basic protection against water penetration. All other accessories help to improve the effect of asphalt waterproofing by preventing water leakage.

Built-in asphalt-polymer rolling materials have proven to be the most comfortable, technologically advanced, reliable and durable in operation.

Asphalt membranes are waterproofing materials consisting of asphalt, synthetic reinforcement material and a protective coating.

Asphalt membranes are the designation of a new generation of roofing material, which differs from ordinary roofing material in several characteristics.

Asphalt waterproofing

In its normal state, it has a stiff consistency. For the use of asphalt in the production of waterproofing materials, the asphalt is oxidized (air is passed through the heated asphalt) and/or modifiers (polymer additives) are added.

Rolls of materials on oxidized asphalt have a short life (no more than 8-10 years); retain flexibility at 0°C; they have low (almost zero) elasticity at temperatures close to 0°C; low heat resistance (usually up to +80°C).

Rolls of asphalt waterproofing have a long service life (10-60 years); they maintain flexibility at low temperatures (up to -25°C); have elasticity at temperatures below 0°C (for polyester-based materials); they have higher heat resistance (up to +130°C); they have excellent adhesive properties.

MODIFIERS (POLYMERIC ADDITIVES)

The addition of polymeric additives significantly improves the properties of asphalt and thus of the entire rolled material.

The following additives are best known as asphalt modifiers: SBS synthetic rubber (styrene-butadiene-styrene) and APP plastic (atactic polypropylene).

The addition of the SBS modifier gives asphalt high flexibility (especially at low temperatures) and elasticity, increases heat resistance and improves adhesive properties.

The addition of APP – modifier gives asphalt higher thermal properties, chemical resistance and resistance to UV radiation, increases adhesive properties. However, the flexibility parameters at low temperatures are a little worse than those of SBS-modified asphalt.

SBS – modified rolled materials are used more in areas with a wide annual temperature range, while APP – in areas with hot climates.

REINFORCED BASE

The cardboard base is cheap, but it does not last long, it actively rots under the influence of moisture. For this reason, the roofing material changes more often. Increasing the strength, water resistance and biostability of the material is possible several times by using synthetic materials as a base - polyester, glass fibers, glass fibers.

The positive effect of asphalt binder modification can be fully realized only if a more durable and rot-resistant base is used instead of a short-lived and fragile cardboard base.

Fiberglass:

• non-rotten base;
• has sufficient strength;
• elongation at break is not less than 2%.

Polyester:

• non-rotten base;
• has high strength;
• it has high elasticity, the maximum relative elongation is not less than 30%.

PROTECTIVE SURFACE TREATMENTS

roofing (split gravel, granulate, gravel) - the upper layer of material, designed to protect against mechanical damage and UV radiation.

polyethylene foil - the bottom layer of material (for waterproofing materials - foil from both sides), which serves as an indicator during welding and prevents the material from sticking to the roll.

DY OF ROLLED MATERIALS

• 1st letter - base type: E - non-woven polyester canvas (polyester); T - fiberglass frame; X - glass fibers.
• 2nd letter - type of topcoat: K - coarse-grained mineral powder; M - fine-grained powder (sand); P - polymer film.
• 3rd letter - type of bottom coating: M - fine-grained powder (sand); P - polymer film; C - self-adhesive coating protected by a special anti-slip film; B - ventilated lids.

example; EPP is a polyester base material with a polymer film on top and bottom. It is used for the lower layer of the roof cover and waterproofing of building structures.