The product range >>
Every product is labelled with coloured adhesive tapes showing the commercial name of the membrane and unambiguously identify the cold flexibility temperature.
This characteristic is one of the fundamental parameters for the choice of a bituminous waterproofing membrane.
A second adhesive tape, only present in the slate or TEX versions, indicates the surface finishing (self-protection) with mineral chips or DECOTEX finishing.
The third band indicates thickness or weight per m² of the product and shows the type of reinforcement used.
The colour is a distinguishing feature in this case as well: the polyester reinforced products have the writing in red letters, whilst those in glass tissue are written in blue letters.
The name >>
The names explain the basic characteristics of the products, for example: MONOFLEX MINERAL 4 MM P
- MONOFLEX identifies the “Family” the item belongs to
- MINERAL, when present, indicates that it is a slated product
- 4 MM identifies thickness or weight per m2 of the products
- P, finally, identifies the reinforcement (P=polyester – V=glass tissue).
How are BITUVER membranes born? >>
What are the parameters for choosing the membranes?
1. Cold flexibility >>This is the main characteristic used to group the quality level of membranes, beyond the intrinsic meaning of the EN 1109 standardized parameter. The most common classes range from 0 °C to -25 °C, passing through intermediate values.
2. Thickness or weight >>Membranes are divided by thickness or weight: the better quality smooth products are generally characterized by thickness (in Italy, the most requested standard is 4 mm), whilst other products, e.g. those with slate self-protection, are characterized by weight (in Italy, the most requested generally between 4 kg/m² and 4.5 kg/m²).
3. Reinforcement >>Materials used for the reinforcement of membranes are polyester or glass tissue. In these two categories there are variations reinforced in different ways and with higher or lower weights.
4. Compound >>The most commonly used polymers are SBS (styrene-butadiene-styrene) and APP (atactic polypropylene) with their variations. Both the families have specific advantages and disadvantages and can be adapted to different situations.
5. Self-protection >>They can be self-protected with grey or coloured slate or granules (the commonest protection), sheets of aluminium or copper (for applications of high aesthetic value and duration) or other lesser used protections.
6. Laying method >>They can be torch applied (by far the most common application in Italy) or they can be thermo-adhesive (adhesion through the external heat generated in summer, torching the upper layer or cold air) or self-adhesive (adhesion given exclusively by self-adhesive compounds). A small amount of bituminous polymer membranes is applied by glue.
7. Number of layers >>Some membranes are certified for single layer application, others, more widespread, are laid in two or more layers. The layers are applied a phase shift between them.
8. Finishing >>The non-protected membranes are finished with talc or sand so as to prevent from sticking to themselves, since they are always packaged in rolls. In recent years, finishes in non-woven fabric or polyethylene are being increasingly proposed.
What are the main characteristics given by the compound? >>
- Cold flexibility (UNI EN 1109)
Minimum temperature for which a sample can be folded around a specific mandrel under specified laboratory conditions without breaking
Value range: [0°C → -25°C]
- Flow resistance (UNI EN 1110)
Resistance of the shape to high temperatures
Value range: [90°C → 140°C]
- Softening Point: Ring & Ball (UNI EN 1426)
The mixture, in normalized test conditions, undergoes softening: viscoelastic state purely viscous state
Value range: [100°C → 150°C]
What are the main characteristics given by the reinforcement? >>
- Tensile strength at breaking
Tension at which the test piece breaks when a determined force is applied to it
- Elongation at breaking
Resulting elongation corresponding to the maximum tension
- Dimensional stability
The stability of the membrane if subjected to heat and mechanical stress
- Dynamic punching resistance
Ability to keep waterproofing feature if subjected to point loads
What is the DECOTEX treatment? >>
It consists of applying a polypropylene tissue on the upper face of a BITUVER membrane. This treatment is an alternative to the traditional non-stick finish with talc and offers several advantages:
- ECOLOGICAL: dust free
- IMMEDIATELY PAINTABLE: time saving
- NON-SLIP: more safety on site
- AESTHETIC: better visual effect.
You can request the Decotex treatment on all products available in the “TEX” version marked with ★.