The reliability of the roof depends on the quality of sealing seams, especially when it comes to rolled bitumen materials. The question of how to glue the ruberoid between each other, arises before every owner of a garage or country house, who decided to repair with their own hands. Incorrect choice of the connecting composition can lead to leaks after the first rainy season, since the material has a specific structure.
There are several time-tested technologies, each of which has its own advantages depending on the type of fabric and operating conditions. Bituminous mastics remain classics of the genre, providing a strong grip, but require accuracy in work. Modern. self-adhesive They simplify the process, but their cost is much higher, and the use is limited by the temperature regime.
In this article, we will take a detailed look at all the available coupling methods, from hot melting to the use of cold adhesive mixtures. You will learn what tools you will need to perform the work and how to avoid the typical mistakes that beginners make when preparing the surface.
Requirements for connecting materials
Before choosing a specific composition, it is necessary to understand the physicochemical properties of the glued surfaces. ruberoid is a cardboard base impregnated with bitumen, so adhesion is possible only with substances on a similar basis. The use of cement solutions or gypsum mixtures is categorically unacceptable, since they do not have elasticity and crack when the roof deforms.
The key parameter for any adhesive is its heat resistance and frost resistance. Roofing is subject to extreme temperature changes: in summer the surface can heat up to +80 degrees, and in winter freeze to -30 and below. Bitumen mastic It should remain viscosity and not drain in the heat, and also not become fragile in the cold.
⚠️ Warning: Never use solvents based on acetone or Kalosha gasoline in pure form without adding bitumen to ruberoid. They can dissolve the top protective layer and disrupt the structure of the cardboard, making the material vulnerable to moisture.
It is also important to consider the time of polymerization or cooling of the composition. If you are working on a pitched roof, the material must be grasped fast enough so that the sheets do not slide down to final fixation. For horizontal surfaces of garage roofs, this parameter is less critical, but the drying speed affects the speed of work as a whole.
Before buying a large volume of mastic, check its elasticity after drying on a small sample. Apply the drop on the glass, let it dry and try to bend - it should not crack.
Floating method: hot method of connection
The most reliable and durable way to connect the canvases is considered the method of melting. It involves the use of an open fire of a gas burner to melt the lower layer. floatable. In this case, the glue as such is not used - the connector function is performed by the molten bitumen of the material itself.
The technology requires the presence of special equipment: propane burner, gas cylinder and protective clothing. The process is as follows: the master warms up the lower part of the roll and the base, after which slowly rolls the material, pressing it to the surface. The molten bitumen protrudes along the edges of the seam, forming a sealed roller.
This method is ideal for rubemasta and other modern analogues with a thicker layer of bitumen. However, for a conventional ruberoid (RCP, RPP), it can be dangerous because of the risk of burning through a thin base. It is important to observe the temperature regime: unheated bitumen will not catch, and overheated will lose its properties.
- 🔥 High speed of work on large areas.
- 💧 Absolute tightness of the seam due to monolithic fusion.
- 🛠️ It requires open fire and gas equipment skills.
- 🌡️ Inability to use in fire-prone areas or in windy weather.
When working with open fire, extreme caution should be exercised. Sparks can get on dry wood or other combustible materials on or near the roof. Always have a fire extinguisher or sand tank on hand.
Cold bitumen mastics for gluing
If the use of open fire is impossible or undesirable, cold bitumen mastics are an excellent solution. These are ready-to-use formulations based on bitumen dissolved in organic solvents. They allow gluing the ruberoid between themselves without heating, which greatly simplifies the technology of work.
It's on like this. mastic with a spatula, brush or roller on both glued surfaces. After application, it is necessary to wait for a technological pause (usually 15-30 minutes) so that part of the solvent evaporates, and the composition becomes sticky. Then the canvases are tightly pressed against each other and rolled with a heavy roller.
There are single-component formulations ready for use immediately after opening the bucket, and two-component ones that require mixing with a hardener before use. For home repairs, the first ones are most often chosen, since they are easier to operate and have a longer shelf life.
| Name of mastic | Basis | Drying time | Consumption (kg/m2) |
|---|---|---|---|
| Technonicol 24 | Bitumen | 24 hours. | 0.5 - 1.0 |
| AquaMast | Bitumen-rubber | 12:24 hours. | 0.8 - 1.0 |
| grida | Bitumen-polymer | 12 hours. | 0.5 - 0.7 |
| Bitumast | Bitumen | 24 hours. | 0.8 - 1.2 |
Work should be carried out in a well-ventilated room or outdoors, using personal respiratory protection.
Hot bitumen compounds (cooking)
The traditional method, which was used by our grandfathers, involves independent cooking of bitumen resin. For this purpose, pieces of solid bitumen are heated in a metal container (barrel, bucket) on a fire or gas stove to a liquid state. This is the cheapest way to cook. glue It's a big volume.
In the process of cooking, the bitumen is dehydrated and stops foaming. Often, used motor oil (about 20-30% of the volume) is added to the molten mass to give elasticity, or diesel fuel to improve penetrating capacity. The resulting mixture is used hot, applying it to the joints of the ruberoid.
⚠️ Warning: Bitumen cooking is a fire-hazardous process. Never heat the bitumen in a closed container and do not leave the boiler unattended. When water enters the molten bitumen, a powerful surge of boiling mass occurs.
The main disadvantage of the method is the complexity of temperature control. Overheated bitumen (above 200 degrees) loses its properties and becomes brittle after cooling. The unheated composition will not penetrate the pores of the material and will not provide reliable adhesion. In addition, hot bitumen cools down quickly, so you have to work at a pace.
Recipe for elastic grease
For 10 kg of bitumen, take 1-1.5 liters of waste oil. Add the oil gradually to the hot bitumen, stirring constantly. This will prevent the seams from cracking in the winter.
Despite the complexity, this method allows you to get a seam, which is not inferior to the factory in reliability. The main thing is to observe proportions and safety techniques. Hot bitumen when hitting the skin causes deep burns, so clothing should cover the entire body, and hands should be in tight gloves.
Surface preparation and gluing technology
The quality of the gluing is 90% dependent on the surface preparation. Even the most expensive glue will not be kept on a dusty, wet or greasy base. Before starting work, it is necessary to carefully clean the ruberoid from dirt, sand and moss.
Cleaning is done with hard brushes or broomsticks. If the surface is wet, it must be dried using a heat gun or let dry naturally. The moisture under the glue layer will turn into steam when heated by the sun and tear off the coating.
The technological process of gluing cold mastic looks like this:
- 🧹 Cleaning the surface from dust and debris.
- 🌬️ Drying of the base (humidity not more than 4%).
- 🖌️ Surface submersing with a bitumen primer to improve adhesion.
- 🧴 Applying mastic to both layers of glued.
- ⏳ Time limit for drying (if required by the instructions).
- 🤲 Tight pressing and rolling from center to edges.
☑️ Checklist before gluing
Particular attention should be paid to the sloshing. Ruberoid canvases should overlap each other by at least 10-15 cm. It is in the area of the overlap that the main layer of mastic is applied. After gluing the edge of the overhang, it is desirable to additionally press with a metal rack or smear with bitumen resin for guarantee.
Alternative methods and modern solutions
The construction materials market offers other solutions to the problem of docking. For example, there are special bitumen-ribbon with foiled top layer. They work on the principle of self-adhesive film: you just need to remove the protective layer and press the tape to the junction.
Another option is the use of polyurethane sealants for the roof. They have a high adhesion to bitumen materials and remain elastic for decades. However, their cost is high, so it is rational to use them only for repairing small areas or sealing adjoinments, and not for gluing entire sheets.
It is also worth mentioning the liquid rubber. This is a water-based emulsion, which, after drying, forms a seamless rubber-like coating. It can be missed joints ruberoid, creating a reliable waterproofing layer. It is applied by spraying or brush.
⚠️ Warning: Do not try to glue the ruberoid with mounting foam. The foam has no adhesion to bitumen, is afraid of ultraviolet light and will quickly collapse, leaving the seam open to water.
The choice of a particular method depends on your financial capabilities, the availability of tools and the extent of damage. For a small repair of the garage, a cold mastic or bitumen tape will suit. For major repairs of the roof of the house, it is better to consider the option with the melting or use of high-quality polymeric materials.
The most budgetary and affordable method for one-time repairs is cold bitumen mastic. It does not require special equipment and is safe to use.
Frequently Asked Questions (FAQ)
Can a ruberoid be glued with PVA glue or silicone?
No, you can't. Polyvinyl acetate glue (PVA) is soluble with water and has no adhesion to petroleum products. Silicone sealants also do not hold on bitumen because of low adhesion and different coefficients of temperature expansion. Use only bitumen-containing compounds.
At what temperature can a ruberoid be glued?
The optimal temperature for working with bitumen materials is from +5 ° C to +25 ° C. At lower temperatures, bitumen becomes too viscous and does not penetrate well into the structure of the material. Cold mastics can work up to 0°C, but the surface must be completely dry.
How to dilute thickened bitumen mastic?
To dilute bitumen mastics, you can use white spirit, kerosene or solvent. Gasoline is not recommended as it evaporates too quickly and can change the properties of bitumen. Add the solvent in small portions and mix thoroughly.
How much does the bitumen mastic dry at the joints?
The time of complete drying depends on the thickness of the layer, air temperature and humidity. Usually, the surface film is formed in 12-24 hours. Full polymerization and strength set take up to 3-7 days. Until this time, it is desirable not to expose the seam to mechanical stress.