Today we will talk about a very interesting building material that has replaced hot bitumen. This is bituminous mastic for roofing. It is necessary to immediately indicate that the classification of this material includes several items. One of them is roofing. We offer you information on the technical and operational characteristics of mastic, which will help you to control the work of masters involved in covering the roof of your house with soft roofing materials, where bitumen mastic is indispensable.
This is a modified petroleum bitumen in pure form, which added a variety of purpose additives. It is the latter that smoothes some of the negative aspects of this waterproofing material. For example, its high fluidity or cracking at low temperatures.
In appearance, roof mastic is a pasty substance of black color, highly saturated. This is a finished roofing material that does not need to be diluted or heated. The main requirement is to use at positive temperatures.
used As we are talking about roofing, then accordingly apply it on the roofs. Here there are three use cases :
on flat roofs as waterproofing and adhesive for soft roofs (roofing material, steglohydroizol and others);
on sloping roofs as glue in the process of covering some sections with shingles;
as roofing if rubber, rubber or latex are added to the mastic.
As for the method of application, there are no complex variations. To do this, use paint rollers, brushes or spatulas. For the complete coverage of the roof plane, special equipment is used, which supplies the roofing bituminous coating under pressure, for which the equipment includes an air compressor.
On our site you can find contacts of construction companies that offer any kind of roofing services difficulties. Directly to communicate with representatives, you can visit the exhibition of houses "Low-rise Country".
We must pay tribute to bitumen mastic for waterproofing the roof for its characteristics. They determined the popularity of this material. Its advantages include such characteristics :
high elasticity , which gives the deposited layer at high temperatures, stretching, not tearing, and low does not shrink too much;
high tensile strength , this allows you not to worry that the coating is at the junction points with other planes (for example, with a protruding pipe on the roof ) disperses or breaks due to temperature drops or light mechanical loads;
long-term operation, which corresponds to the service life of the same soft crawl, and it is within 15-25 years;
low price compared to other types of waterproofing materials and adhesives;
high resistance to aggressive environments and natural loads;
ease of application on the surface of various building materials;
the last types of mastic even do not require cleaning the plane from rust, paint and other contaminants;
in its pure form applied to the roof construction of mastic, even in 2 -3 layers, it will be much easier than installing the same soft roof;
simplicity Repair roofs covered with roofing mastic for roofs;
viscosity , which defines the thickness of the coating, i.e. the layer is applied too thinly.
And as for disadvantages . There are not many of them, but they exist:
Weather conditions affect the ability to use this bituminous material.
It is almost impossible to control the thickness of the layer being laid.
If there are a large number of flaws on the flooded plane, for example, bumps, protrusions, pits, then such a surface should be well prepared, smoothing out all defects, or increasing the thickness layer, that is, increase the consumption of material, thereby smoothing the irregularities of the treated roofing surface.
In principle, the proposed classification is conditional. It has three positions :
Mastic for the roof of cold use . This is a ready-to-use material. If there is a need for the composition to become more liquid, then it is diluted with solvents.But it should be noted that the diluted mastic may not be for long. She quickly pushes out any liquid, becoming back viscous. Therefore, the diluted mass should be used immediately. If the temperature on the street is close to zero degrees, then the mastic mass before use on the roof should be heated to a temperature of +30 or + 40C.
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Hot applications . Rarely used today material, because it is the first bitumen mastic, which began to produce, as a replacement for hot bitumen. It does not have the highest characteristics, besides, before using the mass is required to heat up to + 150C. Therefore, it is practically abandoned today, although it is still present in the varieties. Someone may say that this type is used for fastening roll materials from the category of "soft roof". It makes no sense to argue, this is true, but cold mastics are used in these building operations too.
Water-based . It is necessary to say about this material that it is the most eco-friendly of all the proposed ones, because ordinary water is present here as a solvent. After applying the solution, the water evaporates, and only bitumen with additives added to it remains on the roof.
There is another classification of roof mastics in which species are divided according to the type of in filler bitumen. Here three positions :
Bitumen-polymer mastic, also known as latex . This is a symbiosis of bitumen emulsion and modified latex. The presence in the mixture of latex, that is, non-toxic and non-hazardous substances, allows the use of mastic mass even inside the premises as a waterproofing coating. For example, inside a bathroom or toilet, where waterproofing work is carried out before laying tile. It should be noted that the latex variety easily adheres to any building material.
Rubber-bitumen mastic for roof waterproofing . Here, small rubber crumb is used as a filler. This is a purely roofing material, it is not used anywhere else. Such mastic is applied to the surface of flat roofs by spraying under pressure. Some manufacturers offer modified mastics of this type, which can be applied at temperatures ranging from -40 ° C to + 80 ° C. The most important characteristic of rubber-bitumen mastic is not to stretch. Yes, and high mechanical loads she cares nothing.
With rubber filler . By all indications, rubber mastic is better than the spirit of the first. Its distinctive feature is to stretch by 20% from its normal state. That is, it is a rather elastic coating that does not tear when there is a strong temperature difference.
Clearly about bitumen waterproofing, see the video:
It might be interesting! In the article at the following link, read about the steps for repairing a soft roof.
We will not consider here how bitumen waterproofing mastic is used for roofing when laying a soft roof or shingles. These technologies are simple because the material is simply applied to the surface with a spatula, roller or brushes. A more complex process is the creation of roofing mastic itself. About this and tell.
First of all, it should be noted that bitumen mastic is placed on the surface of flat roofs after cleaning the latter. Therefore, if a reconstruction is being carried out, that is, the replacement of the old coating with a new one, then the old roof must be completely torn off, the old adhesive compound should be removed by any means to the concrete floor surface. The latter is cleared of debris, dedusted and treated with a bitumen primer.
Now to the question how many layers should be used when applying mastic.
If the roof slope does not exceed 10 ° , then three layers are laid, each of which is necessarily dried before the next one is laid. At the same time, reinforcing fiberglass mesh is laid between the layers. On the last freshly laid layer, you can fill the crushed stone fines or gravel.
If the angle of inclination of the roof slope is in the range of 10-20 ° , then two layers are laid with one reinforcing between them. Top bitumen roof can be painted.
If the angle of inclination exceeds 20 ° , then apply a single-layer coating with a thickness of not less than 3 mm, which is coated with paint on top.Although the masters recommend not to reduce the number of layers less than two.
The thickness of the applied bitumen layers should not be less than 1 mm. The material itself is applied either in a bulk manner, when the mastic is poured and spread over the surface to be treated with mops and scrapers, or by spraying under pressure. The first option is considered consumable because it is difficult to level the layers of a certain thickness. By the way, it should be noted that the average consumption of bitumen mastic on a craw is 1.5 kg / m².
And a few words about the price of bitumen mastic. Of all the brands offered, the cheapest is mastic bitumen-polymer (MBH). It is worth one bucket weighing 16 kg in the range of 900-1000 rubles. Bitumen-rubber mastic costs from 2000 rubles for a bucket weighing 20 kg.
The video shows one of the technologies for creating a mastic roof:
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The advent of roofing mastic masses on the market has made the process of repairing or creating roofing coatings more simple and of high quality. At the same time, there was no need to carry out hot work, as it was with ordinary bitumen, which was previously used for restoration work. The low price and high quality of the final result are the main advantages of this roofing material.
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