How to protect the waterproofing layer from the fire on sight
One of the weak points of the building against a fire is represented by the cover, because the flames tend to rise upwards and can be easily fed by the same roof structures. Technology and regulations on fire prevention and fire protection in buildings is very advanced, but it should not be overlooked that a fire can also originate from external factors and develop on the roof due to burning embers carried by the wind from of nearby buildings fires. Even the presence of photovoltaic systems, with relative cabling, is a risk factor, albeit minimal, that must be considered.
Novaglass, consistent with its Quality Policy, he has invested in innovation and development in the field of safety and reliability of its products.
The collaboration with leading Swedish Certification Laboratories (SP) and Germans (MPA), favored the acquisition of a “field experience” regarding the issues related to the fire resistance of polymer-bitumen membranes.
Today Novaglass can offer the market a complete range of products Certificates No-Fire, successfully used in over 40 countries worldwide.
The fire is a combustion reaction that takes place in a violent and uncontrollable.
The origin of the fire, and the fire that derives, is due to the simultaneous presence of three elements:
– A fuel: it burns;
– A comburent: it allows the combustion (oxygen);
– A cause of ignition: spark or other cause.
Once triggered, the fire phases have a duration and a development function of the amount and the characteristics of the combustible materials involved, the distance between the various combustible materials, as well as the amount of combustion present.
The “fire load” is an index that estimates the degree of danger and intensity of possible fires.
The fire is fed only in the presence of an adequate amount of combustion, usually oxygen content in the air.
He held in the air as long as its concentration does not fall under the generic value of 14% (varies Fuel type function).
There are cases where different substances contain in their molecule a sufficient amount of oxygen, for burn without any input from the outside and then even in the absence of air: the most famous among them are the explosive substances and celluloid.
When, for accidental or malicious it has development of fire and flames can generate a real fire.
A fire occurs in a series of 4 phases as a function of temperature in the affected area and the passage of time.
In the initial stage the temperature increase is very slow and almost linear due to the limited amount of combustible material involved and especially because of the large thermal dispersion is still cold environment, significant absorption by walls, walls and ceilings, and the evaporation of moisture in materials, including non-fuels such as cement and bricks.
In this phase the temperature trend undergoes a sharp increase and the increase assumes an exponential trend. It initially reaches a temperature such as to cause an abundant production of the distillation gases originated from combustible products which, combined with the air present, form a flammable mixture, triggered in turn by the temperature that is the amount of heat up to that produced currently. From this point onwards the fire involves essentially gaseous components that the propagation make very fast up to the involvement of all combustible products present. The amount of heat present in the environment reaches levels such that the dispersion phenomena are almost negligible while all the residual moisture is removed very quickly. The step of flash-over leads to an increase in temperature up to the achievement of 500/600 ° C in a time which can vary from 5 to 25 minutes depending on the type of fuel and, above all, of the quantity of combustion provided.
Generalized or total fire
In this phase all that is flammable participates in the combustion and the temperature continues to rise fueled by the considerable amount of heat produced. The dispersion in the environment is limited while begins to be important the transmission of heat through the walls and ceilings because of the enormous difference in temperature between the partitions and the external environment. The total fire involves the attainment of temperatures that exceed 900 ° C and may reach over 1,100 ° C, and the increase of such temperatures is constant up to the theoretical achievement of a balance between heat involved in the fire environment (interior) and external environment.
Cooling or extinction
In this phase the combustible material begins to run out while the dispersion (through walls and openings) assumes a significant importance.
The temperature begins to regress with a trend first slow and then faster and faster until it reaches temperatures of 200/300 ° C due more radiant effect of the hot surfaces of the structures to new combustions in place.