Bituminous mastic : types, characteristics and features of the application

Roof construction today has become much more interesting pastime and progressive than it was until recently.The reason is not only the use of modern technologies in the management of the construction work, but also the introduction of innovative materials, one of which is the bituminous roofing mastic.Since its creation has decreased the need for roll materials, widely used in the repair or reconstruction of flat roofs.This can provide a roofing waterproofing effective surface.In this article, we'll show you what a bituminous mastic: types, characteristics and features of the application which is of interest to many.

What is the mastic asphalt

Mastic asphalt roofing - is artificially created material that is nothing but a mixture of organic substances with astringent properties, natural mineral additives and fillers of various sizes.The composition of matter can be implemented antiseptics and herbicides.The output is a viscous homogeneous mass, which is just enough to pour onto a flat surface.After hardening mastic asphalt roof like a monolithic material, rubber-like in appearance.

mastic composition is different.Depending on the substances contained in it is isolated and two-component one-component mastic:

1. One-component mastic produced from certain solvents.They are completely finished product, which can be used immediately.It seizes during volatilization of the contained solution of a volatile solvent.For sale such mastic in hermetically sealed containers, thus avoiding premature hardening of the material.Use these mastic should be within 3 months from the date of production.The exception to this rule is the mastic asphalt for roofing made of polyurethane.To solidify its needed water vapor contained in the air.Due to the absence of the solvent in the polyurethane mastic during its polymerization no shrinkage.In a sealed container, this material can maintain their properties up to 12 months.
2. mastic consists of two separate substances, which can be stored separately for over a year.This makes it possible to prepare material in advance.Working composition can be prepared only by mixing the two components into a single mass.

flat roof What is the useful properties of mastic

If we draw a comparison with the rolled materials, then roofing mastic bitumen has a number of advantages, the main of which - the formation of the film surface or membrane, whichabsolutely is waterproof.Technical characteristics of the roll and mastic roof are similar, but there are no joints, which reduces the risk of leakage to a minimum when roofing mastic.Thus all mastic coatings have the properties set forth below:

• stability under aggressive environmental factors.
• low weight.
• good elasticity.
• sufficiently high strength.
• impervious to corrosion.
• stability when exposed to oxidizing material and ultraviolet radiation.

How can the lack of mention of the fact that the roof is to apply mastic must be absolutely flat and level as the liquid substance is distributed over the surface of a thin layer under the influence of gravity.If even a small slope to drain the substance just to one side.To align need more of a solution.Several neutralize this effect helps to add a thickening agent or cement.This is done in the presence of the slope over 12 degrees or high (over 25 ° C) temperatures.

What are the kinds of roofing mastics

order to classify roofing mastics, took into account the following important features:

• use method (hot and cold).
• Purpose (roofing, insulation, waterproofing and asphalt, corrosion pasted).
• solidification method (curable and non- curing).
• type of binder (bitumen-polymer and bitumen-latex roofing, hlorsulfopolietilenovaya, polymer, buttilkauchukovaya).
• type of solvent used (water content, organic solvents, liquid organic substances).
• elemental composition (one-component and two-component).

current mastic possess properties such as water resistance, biostability and enhanced adhesive strength.These materials can be successfully used on the roofs of newly built and old roofing surfaces.With them you can:

• Stick Rolling and waterproofing materials for the roof.
• settled on the roof of the protection layer.
• Make full installation of the roof mastic.
• Construct a vapor barrier.
• Perform corrosion protection of falgoizola on the roof.

Under current GOST "Mastic asphalt roofing hot", the material must have the following required properties:

• stand out easily in the implementation of the process of application and use.
• has good adhesive property, regarding the use of horizontal and vertical surfaces.
• To form a flexible coating.
• not form cracks during solidification.
• be sufficiently durable.
• resist stress and gradual shrinkage.
• not lose flexibility even at low air temperatures.
• easy to succumb to the instrument in the course of work on the installation of the roof mastic.
• not lose quality in increased humidity conditions.

these benefits have reported that the mastic asphalt roofing is an interesting building material for the construction of roofs, having a small slope of the roof.

Systematics mastics by type of binder and other indicators

As previously mentioned, by type of mastic binder are bitumen, bitumen-polymer, and rubber-wood tar.
Fillers for roofing mastic is usually used:

• of short mineral wool.
• Common asbestos or dust.
• Tailored pulverized powder made of limestone, brick, quartz, etc.
• ash combined or appearing in the pulverized coal burning fossil fuel.

Fillers are needed to improve performance, with which should have a cold roofing mastic, namely:

• hardness and density.
• reduced brittleness at extremely low temperatures.
• reduce the specific consumption of binders.

Eating fibrous fillers enables reinforced mastic, making it more stable in bending.
Roofing mastic according to the process of solidification is divided into curable and non- curing.By diluent
mean they can be divided into the mastic:

• water containing roofing bitumen.
• containing solvents based on organic compounds.
• containing liquid organic substances.

Properties bituminous mastics

Every roofing mastic, giving rise to air polymerized for one hour.During this smooth surface is formed flexible, what has great stability with respect to various weather influences.Resulting in the end material has excellent water resistance, good adhesive ability, and in certain cases biostability.
By bitumen roofing mastic to meet the following demands and norms:

• structure of any mastic required to be uniform, there should be no fillers or particles of the binder impregnation.
• Mastics should be comfortable enough to be applied to the surface.In their composition must be free of harmful volatile substances that could be released during use or their number should not exceed the maximum permissible limits.
• Though hot, though cold mastic must have a high water resistance and biostability.
• All bituminous mastics must have heat resistance of at least 70 degrees.
• They should stick quite firmly rolled materials.

In addition to mastic very high demands on the service life of physical and mechanical properties of the material should be stable throughout the period of operation declared by the manufacturer.

technology applying mastic on the roof surface

on quality insulated surface prior to coating is applied mastic emulsion paste liquefy bitumen.She plays the role of a primer, at times raising the mastic adhesion to concrete base.Then it carried out covering the entire surface of the core with several layers of bituminous mixture.The number of layers depends on the angle of slope of the roof.

Among these layers must be present so-called reinforcing layer.It is made of putty with a special reinforcing structure.Over it applied another layer of mastic.It allows you to enhance the places where the most possible periodical accumulation of water.At the final stage of the applied layer of protection that can be made of a cladding material, gravel, coarse sand.It may even be an ordinary surface staining protective paint.

composition characteristics of bituminous mastics

Roofing mastic asphalt is a material that is present in the composition of artificially synthesized bitumen.They are the result of deep processing of oil from its tar residues.These resinous substances when heated strongly change their viscosity.The color of bitumen are black or dark brown.According to the degree of viscosity builders identify several types of bitumen:

• For impregnation of roll roofing materials is common to use liquid formulations based on bitumen.
• Bituminous mastic themselves rolled materials, paints made from solid and semi-solid bitumens.

The composition of bituminous mastics include substances such ka filler, solvent and various additives.Roofing mastic is distinguished by the fact that it is able to create a cover resembling a film or membrane, which will have all the properties of rolled materials, but it does not have seams.It is noteworthy that there are kinds of pastes as a bitumen-latex, which is used as an adhesive for laying on the rolled material as the new roofing, and the old repaired.The big plus of bituminous mastics is undoubtedly an opportunity to paint them in any color.Dyes can be added during longer Roofing right in the very mass, and can be purchased already colored in the store.