Features and rules applying roofing mastic

By Admin | Garden And Buildings / Construction And Repair
13 May 2016

Roofing is an important step in building a house.With the advent of the construction market a variety of roofing materials, this process becomes more advanced and interesting.One such material is a roofing mastic.It is used in the repair and roof construction, 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, the rules of application, and others.


roofing mastic - its composition and performance of the ↑

Roofing mastic
Roofing mastic freely spread a thin layer on the surface of the roof, forming a protective monolithic membrane

Mastic roofing is an artificial material that consists of a mixture of

binders with mineral additivesand various fillers (mineral wool, asbestos, cement, fly ash, silica, lime).Fillers provide surface hardness at hardening and its stability during temperature fluctuations.Most of the mastic includes herbicides and antiseptics.Homogeneous viscous mass is easily poured onto the surface of the roof, forming after curing a monolithic membrane that protects the roof from weather.

The properties of mastic and roll roofing is largely 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

Single- mastics are based on solvents and are ready-to-eat product.As the solvent evaporates, they harden, so as to avoid premature curing, they come to market in sealed containers.Mastic store such a short time - about 3 months.An exception is the polyurethane mastic (it lacks a solvent) - it is stored more than 12 months.

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

mastic coating characterized by the following positive effects:

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

To mastic is distributed evenly, the roof surface must be flat, so it is mainly used on flat roofs.

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

If necessary, change the color or viscosity of the mastic, it is possible to add special fillers.They are also added to improve the hardness and heat resistance, reduction of share rate of binders, reducing brittleness of the material at very low temperatures, increased resistance to bending.

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

The main advantage of the roof covered with mastic considered its lack of seams and joints.Another plus roofing mastic - its elasticity, which allows you to store the roofing leaks at a deformation of the roof.But to create a uniform cover of mastic is necessary to ensure a perfectly flat surface of the base or to increase consumption.However, both the first and second leads to an increase in cost of coating.Sometimes it is impossible to achieve a uniform thickness of the layer of mastic, a fact which is considered a drawback.But in such cases there is a special technology of its application in two layers.The first layer is applied to one color, and the second - a different, contrasting color.The second coating layer should have a thickness such that therethrough can not be seen the first layer.

Species roofing mastics ↑

mastics roofing are classified as follows:

  • by application - corrosion, roofing and insulation, gluing, 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;
  • by the method of cure - curing and non- curing.
  • by type solvent - 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.

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

Bituminous roofing hot a binder composition of bitumen roofing, modified polymers and mineral filler.Before applying hot bitumen mastic further heated to 150 ° C.It is perfectly combined with other building materials to create a solid roof system with endurance to different influences and is used for waterproofing, repair of roofs, adjoining the roof cladding for pipes, funnels, ventilation wells.There are a number of requirements to be met Bituminous hot - standard and other applicable standards define a list of them follows:

  • mastic structure should be homogeneous (without extraneous fractions);
  • 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 the horizontal and inclined surfaces;
  • must not crack during curing.

Bituminous roofing -latex is a mixture of original and synthetic binders, various additives and mineral fillers.Binder components therein are latex and bitumen, fillers and - asbestos, rock wool, various powders.This type of mastic used for roof repairs for bonding various roll materials for the roof as well as a self-durable waterproof coating.

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

basic rules applying mastic ↑

Application bitumastic
Apply sealant on pre-cleaned from dust and dirt flat surface

Bituminous roofing is applied without removal of the old coating, except when on the roof there is a large number of web materials that have been flooredin the course of numerous renovations.They do not make it possible to apply the paste and a thin smooth layer.

roof surface must be free of dust, dirt and dust.Apply cold-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, use roofing mastic is not recommended.

thickness of the layer is usually equal to 1 millimeter, and it dries in 24 hours.When applying several layers of drying time will be 1-7 days.If mastic put on a flat surface, material consumption is approximately 1.3 kg / m2.

In the cold season it is recommended to warm paste to 50 degrees before applying to better adhere to the surface, and to give the best performance properties of the roof mastic coating sprinkled powder.

Fiberglass reinforcement for roofing mastic
reinforcing mesh improves the strength characteristics of the mastic coating

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

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

roofing mastic is used to repair the roofs of any type - metal, concrete, roll, asbestos-cement, mastic.

Although the device mastic roof and it seems simple, the job best left 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, can result in serious problems in the future.