Lee is sewn longitudinally using refractory threads such as tissue and at intervals of 2 to 3 cm, and it is used to produce two-layer isogum in order to remove tissue.
Important Note: By removing the tissue in the bilayer isogum, it is practically disarmed against the UV penetration of the sun and decomposes quickly.
Ways to reduce prices and increase quality:
Removal of 70-60 bitumen and its replacement with blown bitumen (fuel oil) which reduces the production cost and price of isogum for two reasons: a) removal of polymer b) very low price of fuel oil compared to 70-60 bitumen c) lower production cost
Remove fuel oil and replace it with slug (slug is almost free and only costs shipping)
Remove thermobonding and replace it with tissue and polyester (thermobonding is more expensive than tissue and polyester)
Removing the tissue and replacing it with sewn polyester (reduces the cost of isogum fibers by half and reduces the price of isogum significantly.
Very important point: In general, many substandard isogams must be of foil type to create a better view for the customer with foil and neat packaging.
General and final result of using substandard isogams (blown)
Up to 2 to 4 years after the installation of isogum and due to changes in ambient temperature, this type of isogum is rapidly weathered and in the weathering process, it undergoes an interlayer rupture, and as a result, with gradual decomposition and accumulation of gases, it undergoes internal rupture. As a result, with gradual decomposition of the isogum and accumulation of gases from the decomposition, first the foil is separated from the insulation surface after swelling and mosaic cracks or lizard skin are created on the insulation surface and spread in winter, then the isogum swells from the roof surface. After separation, it is broken and torn, and finally, by water destruction and destruction of isogum, water leakage occurs, which can cause significant damage to the roof and to the whitewashing and painting of the building.
Types of isogum standards:
B.p.p (polymer-bituminous bitumen): Ex A (polymer isogum)
B.p.c (polymer-bituminous bitumen): Former S (polymer isogum)
B.p.f (blown bitumen): Former O (blown isogum or oxide)
Today, due to the temperate and tropical nature of most parts of the country and at the same time the low quality of many buildings that can sit and the seismicity of the country, the most important feature of isogum that should be paid more attention:
Longitudinal and transverse tensile strengths of isogum that do not tear quickly and do not disappear.
In the production of isogum, 70-60 bitumen should be used so that it does not decompose in the heat of summer. Therefore, cold insulation of insulation should be considered more in very cold regions.
Features of bitumen or Vb (vacuum baton) with isogum in school renovation and equipment offices.
Considering the instructions of the School Renovation and Equipment Organization of the country to the general departments of school renovation and equipment based on choosing a bitumen and isogum factory, it seems that the most important things to consider are:
Priority is given to the isogami factory, which can also convert VB to bitumen at the same time, because it has the cost of converting VB to bitumen. . Therefore, with the aim of the main and most powerful manufacturers of isogum, a defined evaluation can be performed in terms of the following:
Visiting the factory site and getting acquainted with its facilities and capabilities
Be a bitumen and isogum maker (producer of bitumen and isogum)
Provide stock documents related to the purchase of 70-60 bitumen or VB during the current year and at least the last 5 years.
Mafasa should present an asset account for at least the last 4 to 5 years to make sure the factory has been continuously active.
Provide financial capacity with the approval of the bank, which indicates the financial strength of the factory in fulfilling its obligations.
Provide a bank guarantee to participate in the tender
Provide a valid bank guarantee for the total value of the contract.
Insurance list of factory employees and workers, which indicates the ability to produce the factory.
Provide an operating license with a history of at least 17 years, which ensures the practical part of the next guarantee and warranty.
Provide consent from other former and current customers and buyers, especially in the School Renovation and Equipment Organization, to declare satisfaction with production capacity, product quality, work discipline, planning and commitment to deliver goods and optimal performance of work.
Executive records and resume for at least 17 years.
Important Note: Considering that the esteemed government in this year’s budget plan to repay many of its debts to contractors has delivered and sold various types of bitumen or VB in exchange for their claims. As a result, the current supply of bitumen in the market is higher than the demand, so the price of bitumen in the stock market is about 20% higher than its price in the market. Therefore, in order to facilitate the issue of bitumen purification or VB with isogum and benefit from the maximum capacity and value of the quota of that organization, it is suggested:
It is even possible to give isogum to the manufacturer instead of VB bitumen.
Follow-up, assistance and special efforts should be made to select and determine the place of delivery of VB or bitumen with the opinion and proposal of the isogum manufacturer who is the party to the contract of the organization. Due to the imposition of additional costs, the isogum factory sells bitumen on the spot and is forced to take into account the loss of the sale and the drop in the price of bitumen in the price of isogum, which can cause the price to rise.
Very important point in installation and execution: Considering the importance of installation and execution of isogum, which can play a very tangible and decisive role in the quality of work and insulation of the building. In such a way that if the installation is not done properly, all the efforts and efforts to prepare and produce ISO
It is even possible to give isogum to the manufacturer instead of VB bitumen.
Follow-up, assistance and special efforts should be made to select and determine the place of delivery of VB or bitumen with the opinion and proposal of the isogum manufacturer who is the party to the contract of the organization. Due to the imposition of additional costs, the isogum factory sells bitumen on the spot and is forced to take into account the loss of the sale and the drop in the price of bitumen in the price of isogum, which can cause the price to rise.
Very important point in installation and execution: Considering the importance of installation and execution of isogum, which can play a very tangible and decisive role in the quality of work and insulation of the building. In such a way that if the installation is not done properly, all the efforts to prepare and produce good isogum will be wasted and the desired result will not be achieved by water leakage in the building. Therefore, the most effective cases of installing isogum are stated as follows:
Definition of isogum installer: Isogum installer is a workforce that has been trained in isogum skills, which include:
The amount of heat required by the isogum for installation
Familiarity with the installation design in accordance with the geometric shape of the roof in terms of slope and position of the ridges and other other details of the roof, which prevented the creation of inverted overlaps and throwing of isogum with the least extra cut of isogum.
Having adequate and necessary health physically, mentally and morally
Adequate familiarity with the principles of occupational safety and health at high altitudes and in busy areas such as schools
Having full legal competence to have accident and work liability insurance
Sufficient experience in installation
Very important point: due to the negligence, simplicity and insignificance of the installation issue by the employers, generally unqualified people install isogum at the lowest price. This issue can first of all cause the destruction of isogum and in some cases, in addition to creating various dangers and physical and moral injuries to the installer or other people present in the area, it can cause a lot of damage to the ceiling and the whitewashing area. Create a building painting. Therefore, in order to achieve the best result from the installation problem, it is recommended that the isogum factory be installed by its approved agents and installers in order to issue the warranty and guarantee in a unified manner and take full responsibility for it. .
