The consumption of propane per 1m2 of the Technonicol roof in 1 layer directly depends on the speed of the burner, the ambient temperature and the quality of base preparation, making an average of 0.2 to 0.4 liters of liquefied gas per square meter when observing the technology. Incorrect setting of the flame or ignoring weather conditions can increase this figure by one and a half to two times, which significantly affects the final estimate of the object. Professional roofers know that accurate fuel calculation is necessary even at the stage of purchasing materials to avoid the crew downtime due to a sudden exhaustion of gas in the cylinder in the middle of the work cycle.
The bulk of the gas is spent heating the bitumen layer to a state of fluidity, when it begins to shine and easily adhere to a concrete screed or insulation. If you are working with materials TechnoNICOLsuch as TechnoELAST or UniflexIt is important to consider that different modifications of bitumen have different melting points. Overheating of the canvas leads to burning of oils from bitumen, making the coating fragile, and underheating - to the absence of adhesion and the formation of air bubbles, which later become foci of leaks.
There is a direct relationship between air temperature and fuel consumption: the colder it is outside, the more energy it takes to warm the base and the roll itself. In the summer months at temperatures above +20 ° C, the flow rate is minimal, since the bitumen is already heated by the sun, and the base does not require intensive drying. In winter, when installation is carried out using greenhouses or at low positive temperatures, the costs of liquefied hydrocarbon (LPG) increase critically, requiring more powerful burners and frequent replacement of cylinders.
Factors affecting gas consumption during melting
The first and most significant factor is the humidity and temperature of the base. Concrete screed has a high heat capacity and may contain residual moisture, which must be evaporated before laying waterproofing. If you try to fuse the material onto a cold or wet base, most of the heat from the burner will go to evaporation of water and warming up the concrete, rather than melting bitumen, which will lead to overconsumption of propane.
⚠️ Warning: Floating on a wet base is strictly prohibited, since water will turn into steam when heated, break the bitumen layer and create bloating that cannot be eliminated without dismantling the coating.
The second important parameter is the qualification of the performer and the type of equipment used. An experienced craftsman moves the burner evenly, using reflected heat to warm up the end of the roll and the base simultaneously, while a beginner may hold the flame too close or drive the burner chaoticly. Use of modern burners with nozzle The thrust regulator allows you to optimize the torch, making it hotter and more directional, which reduces the overall fuel consumption.
The third factor is the wind load on the facility. A strong gusty wind blows away heat from the burner, preventing it from effectively affecting the material. In such conditions, it is necessary to either increase the gas supply or build windscreens, which also affects the speed of operation and resource consumption. To minimize heat loss, it is recommended to use burners with a protective casing.
- 🌡️ Ambient temperature and base: A key parameter that determines the starting point for heating.
- 💨 Wind speed: directly affects the stability of the torch and heat loss in the process of operation.
- 🏗️ Surface Preparation Quality: The presence of dust, dirt or moisture requires additional time and gas to be treated.
The geometry of the roof should also be considered. On flat areas, gas consumption is stable and predictable, but the presence of a large number of adjoinings, pipes, parapets and winds increases the complexity of the work. In these areas, more delicate and often longer heating of small areas, the use of hand burners, which can locally increase the consumption of propane per square meter, is required.
Regulatory indicators and flow tables
Budget planning and procurement of materials should be based on average normative data. Manufacturers of roofing materials, including Technonicol CorporationTest their products in various conditions, the results of which form the basis of technical maps. Below is a table showing the dependence of the consumption of liquefied propane-butane on temperature conditions when a single layer of waterproofing is installed.
| Installation conditions | Air temperature (°C) | Propane consumption (l/m2) | Note |
|---|---|---|---|
| Summer period | +20...+30 | 0.20 - 0.25 | Minimum warm-up, fast work |
| off-season | +5...+15 | 0.30 - 0.35 | Careful heating of the base is required |
| Cold period | -5...+5 | 0.40 - 0.50 | Required heaters, high consumption |
| Complex knots | Anybody. | +15-20% normal | Adjacents, funnels, pipes |
It is important to understand that the data in the table are indicative. The actual consumption may vary depending on the thickness of the material. For example, melting TechnoELAST EPP 5 mm thickness will require more energy than installation Bipol 3 mm thick. In addition, the two-layer laying system implies that the first layer (lining) can be consumed less gas, since the requirements for heating there are slightly lower than for the finish layer with sprinkling.
Formula for calculating the total volume of gas
To calculate the required number of cylinders, use the formula: (Roof area × Consumption per m2) / Capacity of the cylinder. A standard 50 liter cylinder contains about 42-43 liters of liquefied gas. Always add 10-15% of your reserve for unforeseen circumstances.
When working with premium materials, such as TechnoELASTIt is important not to save on gas at the expense of quality. Insufficient heating will lead to the fact that expensive material will not perform its function, and after a season will require repair. Therefore, when calculating the estimates, it is better to lay the expense at the upper limit of the norm, especially if the work is carried out in variable weather conditions.
Floating technology and resource savings
Compliance with the melting technology is not only a guarantee of the durability of the roof, but also a way to optimize costs. The process begins with rolling roll for fitting, after which one edge is fixed. Then the main stage begins: heating the bottom of the roll and the base. The movement of the burner should be progressive, covering at once both the surface of the base and the end of the roll.
A critically important point is the formation of a 10-20 mm wide bitumen roller in front of the edge of the rolling canvas. This one bitumen roller This indicates that the material has reached the desired temperature and is ready for gluing. If the roller is not formed, then the temperature is not enough, and you need to slow down or increase the flame. If bitumen begins to drain and drip - this is a sign of overheating, leading to overconsumption of gas and deterioration of the material.
- 🔥 Adjust the height of the flame: it should be blue with yellow tongues, without a black smoke tail.
- 👣 Move smoothly: jerks with a burner lead to non-ranomeric warming up and overconsumption of fuel.
- 🧹 Watch for the purity of the nozzle: a clogged burner works inefficiently and consumes more gas.
☑️ Checklist before the start of work
Special attention should be paid to the snare. The width of the lateral overlap is usually 80-100 mm, and the end – 150 mm. These areas require double attention, as this is where leaks often occur. Additional heating of the seams after the main laying (rolling the seam with a hand roller or a craftsman) also requires gas costs, but you can not save at this stage.
Equipment and its impact on consumption
Choosing the right equipment plays no less a role than the skill of the roofer. A standard roofing burner G-1 or G-2, working on propane, should be equipped with a high-quality gearbox, which stabilizes the gas pressure. Pressure surges lead to unstable combustion, which directly affects the flow rate. Modern turbo-mode burners allow gas to be burned more efficiently, creating a higher torch temperature with the same amount of fuel supplied.
⚠️ Caution: Using homemade burners or faulty equipment with leaking connections is not only life-threatening, but also leads to a colossal overconsumption of gas, negating any savings.
The length of the hose also matters. A hose that is too long (over 10 meters) can cause pressure to drop, especially in cold weather when propane evaporates worse. In winter, gas cylinders are recommended to be insulated or paired to ensure a stable supply of gaseous fraction. Use of the gearbox with a membrane that does not tan in the cold, is critical for winter installation.
For large areas, it is advisable to use self-propelled machines for roofing. Such units, for example, series Wacker Neuson or domestic analogues, automate the process of rolling and warming up, providing a strictly dosed heat supply. Although renting such equipment costs money, saving on propane consumption and shortening the time of work often pays off these costs.
Calculation of the number of cylinders for the object
Logistics planning is an important part of preparing for roofing. A standard 50 litre propane cylinder holds approximately 42-43 litres of liquefied gas (the rest of the space is a gas cap for safety). Knowing the roof area and the approximate flow rate, you can easily calculate the required number of cylinders.
For example, for a roof with an area of 500 m2 at a flow rate of 0.3 l / m2, 150 liters of gas will be required. Divided by 42, we get about 3.5 cylinders. However, you should always lay a reserve of 10-15% for ignition, heating the tool, unforeseen downtime and more difficult weather conditions. Thus, for this amount of work, it is worth ordering 4-5 cylinders.
When transporting and storing cylinders, safety rules must be observed. Cylinders shall be in a vertical position, away from sources of open fire and direct sunlight. At the facility, it is desirable to have a spare set of cylinders so as not to interrupt the work of the brigade, since simple qualified roofers cost more than the cost of gas delivery.
Tip: For accurate accounting of gas consumption at large facilities, use gas meters or weigh cylinders before and after a shift. This will help to analyze the effectiveness of the team.
Frequent installation errors that increase costs
One of the most common mistakes is to try to speed up work by increasing the flame. Beginners often think that a more powerful fire will allow the material to warm up faster, but in practice this only leads to burnout of bitumen and the need to remake the marriage. Bitumen is an organic product and has a temperature limit, exceeding which destroys its structure.
Another mistake is ignoring the base of the ground. The primer (bitumen mastic diluted with solvent) fills the concrete micropores and creates the perfect adhesive surface. If you do not use a primer or apply it too little, you will have to spend much more gas to “bake” bitumen into the pores of concrete, which is often impossible without spoiling the material.
- 🚫 Working without a primer: leads to increased warming up time and the risk of detachment.
- 🚫 Uneven speed of movement: leads to local overheating or underheating.
- 🚫 Ignoring the wind: Working without wind protection in windy weather is useless.
⚠️ Warning: Attempting to fuse a new layer over an old bitumen coating without it being completely cleaned or specially prepared (e.g., propane melting) often results in roof bloating due to trapped gases and moisture.
Errors can also include the use of poor-quality or inappropriate gas. Mixtures with a high content of butane in winter do not evaporate well, the pressure in the cylinder drops, and the burner begins to "sneeze" or go out. This forces craftsmen to spend time replacing cylinders and heating equipment, reducing labor productivity.
Seasonal features and winter installation
Winter roof installation is always an increased energy consumption and increased requirements for technology. At temperatures below -5°C, standard methods may not work effectively. In such cases, it is recommended to use heat guns for preliminary heating of the base or to build temporary greenhouses over the site of work.
Materials TechnoNICOL They have different temperature limits of application. Some stamps Uniflex or Ecoflex They are designed specifically for cold climates and retain elasticity at low temperatures, but even their installation requires careful heating. In winter, the gas in the cylinders can freeze (more precisely, the liquid fraction ceases to evaporate), so the cylinders often have to be wrapped in thermal blankets or put in boxes with warm water (observing precautions).
The main conclusion: The propane flow rate is variable, but manageable. Proper preparation, proper equipment and compliance with the technology allow you to keep the flow rate within 0.2-0.3 l / m2 even in imperfect conditions.
In conclusion, it should be noted that gas savings should not become an end in themselves at the expense of quality. It is cheaper to spend an extra liter of propane than to redo the leak in a year. Competent calculation, professional tool and adherence to the manufacturer's instructions are the three whales that support cost-effective and durable roof installation.
How to calculate the number of cylinders per object?
Multiply the roof area by the average flow rate (take 0.35 l / m2 for stock). Divide the resulting value by 42 (volume of gas in 50 l cylinder) and add 15% of the reserve. Round the result in a big way.
Can I use acetylene instead of propane?
Technically possible, but highly discouraged. Acetylene gives a higher temperature, which is difficult to control, which leads to the deterioration of the bitumen materials Technonicol. Acetylene is also more dangerous in storage and transportation.
Does the color of the sprinkle affect the flow of gas?
Yes, it does. Materials with light sprinkling (such as shale) reflect some of the heat, requiring a slightly longer warm-up. Materials with dark sprinkle or foil heat up faster, but the foil must be heated carefully so as not to burn through.
What if the gas in the cylinder ran out in the middle of the roll?
You can't leave the melted edge cooling down. It is necessary either to quickly replace the cylinder (have a stock ready), or, if this is not possible, carefully wrap the edge, previously melting it to prevent moisture from entering the material before work resumes.