Features and rules applying roofing mastic

roof device is an important step inbuilding a house. With the advent of the construction market a variety of roofing materials, this process becomes more progressive and interesting. One such material is a roofing mastic. It is used in the repair of roofs and device not only as a reliable waterproofing material, but also as an independent roofing. It can successfully replace the roll materials for the roof, an affordable price, acceptable performance, ease of application. To select the optimal coverage for a particular structure should be familiar with the varieties of roofing mastics, their properties and application of rules and others.


  • Roofing mastic - its composition and operating properties
  • Varieties of roofing mastics
  • Basic rules for the application of mastic

Roofing mastic - its composition and operating properties

Roofing mastic

Roof Mastic freely spreads a thin layer on the surface of the roof, forming a monolithic protective membrane

Mastic roofing is artificialmaterial which comprises a mixture of binding materials and mineral additives with various fillers (rock wool, asbestos, cement, fly ash, quartz, lime). Fillers provide surface hardness at hardening and its stability during temperature fluctuations. Often in the mastic composition includes herbicides and antiseptics. Homogeneous viscous mass is easily poured on the roof surface, forming after curing a monolithic membrane that protects the roof from weather.

The properties of mastic and roll roofing atlargely the same, but the first priority is its seamlessness. Depending on the composition roofing mastic are single-component and two-component.

Mastic roofing

One-component mastic is stored for long - not more than 3 months, so they are delivered in sealed metal containers

One-component mastic produced based solvents andare ready-to-eat product. As the solvent evaporates, they harden, so as to avoid premature curing, they come to market in sealed containers. Stored mastic such a short time - about 3 months. An exception is the polyurethane mastic (it lacks a solvent) - it is stored 12 months or more.

Two-component mastic consists of 2 chemical compounds with low activity, which are stored for over a year apart, so they can be purchased in advance.

Mastic coating characterized by the following positive effects:

  • a light weight;
  • high strength;
  • elasticity;
  • weathering resistance;
  • UV resistance;
  • Not being corrosion.

To polish distributed evenly roof surface is flat, so it is mainly used on flat roofs.

It is important to know! If the angle of inclination of the roof is more than 12 degrees, and the ambient temperature exceeds 25 ° C, then it is necessary to increase the viscosity of the mastic, adding a thickening.

mastic roofing

The absence of seams and stykov- main advantage of mastic coating

To change the color or viscositymastic, it is possible to add special fillers. They are also added to improve heat resistance and hardness, reducing consumption of shared binders reduce brittleness at extremely low temperatures, increasing the bending resistance.

Roofing mastic

Modern mastic can be given the desired color by adding a filler to the corresponding pigment

The main advantage of a roof covered with masticIt is considered to be lack of seams and joints. Another plus roofing mastic - its elasticity, which allows to maintain the tightness of roofing at the roof deformation. But in order to create a uniform cover of mastic is necessary to ensure a perfectly flat surface of the base, or increase the flow rate of the material. But the first and the second leads to an increase in the cost of coverage. Sometimes it is impossible to achieve a uniform thickness of the layer of mastic, and this fact is considered a drawback. But in such cases there is a special technique of its application in two layers. The first layer is applied to one color, and the second - the other, contrasting color. The second coating layer should have a thickness such that the first layer is not visible therethrough.

Varieties of roofing mastics

Mastics for roofing are classified as follows:

  • Intended - corrosion, roofing, insulation, Bonding on, waterproofing and asphalt;
  • composition - one-component and two-component;
  • the type of binder - bitumen-polymer, polymer, bitumen-latex, butyl rubber, hlorsulfopolietilenovye;
  • by use - hot and cold;
  • method for curing - non- curing and curing.
  • by referring solvent - with a water content on the basis of organic solvents or liquid organic substances;

Currently, the most common are hot roofing mastic asphalt and bitumen-latex roofing mastic.

Mastic asphalt roofing hot

Mastic asphalt roofing is suitable for hot devices sealed contiguity roof membrane to the pipes, ventilation wells

Mastic asphalt roofing hot It is a binder composition of the bitumenroofing, modified polymers and mineral filler. Before applying a hot bitumen mastic is further heated up to + 150 ° C. It is perfectly combined with other building materials, creating durable roofing system with endurance to different influences and is used for waterproofing, repair of roofs, roof membrane junction device for tubes, funnels, ventilation wells. There are a number of requirements to be met by hot asphalt mastic - standard and other applicable standards define a list of them as follows:

  • mastic structure should be uniform (no foreign faction);
  • heat resistance - not less than + 70 ° C;
  • Mastic should be environmentally friendly (no toxic substances);
  • in a heated state must be fluid to freely spreading a thin layer on the surface of the roof;
  • have good adhesion to horizontal and inclined surfaces;
  • It must not crack during solidification.

Bituminous roof-latex is a mixture of original and syntheticbinders, additives and various inorganic fillers. It binders are latex and bitumen, fillers and - asbestos, rock wool, various powders. This type of mastic used in the repair of roofs for bonding various roll materials for the roof, as well as an independent firm waterproof coating.

Note. There are many types of roofing mastics, but in order to choose the right, you need to take into account the structural features of the roof and the conditions of its operation.

Basic rules for the application of mastic

Application of Bituminous

Apply mastic on the pre-cleaned from dust and dirt, flat surface

Mastic asphalt roofing is applied withoutremoval of old coatings, except when on the roof there is a large number of web materials that have been floored in the course of numerous renovations. They do not make it possible to apply the paste and a thin smooth layer.

The surface of the roof must be previouslycleared of debris, dirt and dust. Apply a cold process mastic or with preheating using a roller, brush or spatula. The number of layers will depend on the slope of the ramp and the presence of irregularities. Most often used two-layer coating.

Attention! If the angle of the roof slope greater than 25 degrees, it is not recommended to use a roofing mastic.

The layer thickness is usually equal to one millimeter and driesit is 24 hours. When applying several layers the drying time will be 1-7 days. If mastic applied to a flat surface, material consumption is approximately 1.3 kg / m2.

In the cold season it is recommended to warm up the mastic50 degrees before application, to better adhere to the surface, and to give optimum performance properties of the roof mastic coating sprinkled powder.

Reinforcing fiberglass roofing mastic to

Reinforcing mesh improves the strength characteristics of the mastic coating

The best way to increase the strength of the masticroof - a reinforcement of fiberglass or glass fiber cloth. Application of these reinforcing elements is justified because they themselves have high strength.

It is important to know. Further reinforcement of the roof mastic its strength increases, but the elasticity of the coating is lowered.

Used roofing mastic to repair the roofs of all types - metal, concrete, roll, asbestos, mastic.

Although the device mastic roof and seemssimple, better to entrust this work to people who have a wealth of experience behind him and knows all the intricacies of this case. After all, the slightest errors and inaccuracies in the regeneration of the roof mastic, may result in serious problems in the future.

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