Roofing mastic

Mastic called plastic waterproofing materials produced by mixing organic binding agents with mineral fillers and various additives that improve the quality mastics.
Rolled bituminous materials (roofing felt, asphalt) glued on bituminous mastics, Degteva (only) - on Degteva (coal).
Coating materials can be bonded as hot (Bituminous Degteva) and the cold mastic (bitumen).
Bespokrovnye materials glued only hot pastes.
Hot pastes come in different grades depending on the degree of heat resistance, determined by the maximum temperature at which the sealant, bonding two layers of roofing felt, does not follow when exposed to a slope of 45 °. Not mix different brands of cements.
Mastics are hot, used with pre-heated (160 ° C - for bituminous mastics and up to 130 ° C - for Degteva) and cold, solvent used without heating at temperatures above 5 ° C and heated to 60-70 ° C at temperatures below 5 ° C.
By appointment mastic are:
- Pasted used to glue roll roofing and waterproofing materials and devices of the protective layer of the roof;
- Roofing and insulation used for the device roof mastic, mastic sealing layer;
- Waterproofing and asphalt used for vapor barrier device;
- Anti-corrosion, anti-corrosion devices used for the protective layer of the roof of folgoizola.
By way of curing mastic are curable and neotverzhdaemye that looks thinner - containing water, organic solvents and liquid organic substances. In air mastic grasped for 1 hour to form a smooth elastic surface which is resistant to weathering.
Both cold and hot pastes are characterized by resistance to water, high bonding strength. Some types of cements, in addition, may vary and biopersistence.
The following requirements apply mastic:
- Homogeneity without inclusions of the filler particles, not impregnated binders;
- In the manufacture and use of mastic shall not release into the environment of hazardous substances in quantities above permissible;
- Waterproof, biological stability;
- Solid skleivayunie layers of rolled materials.
In addition, a mastic coating must be durable, that is, have a stable physical and mechanical properties in service.
The sequence of applying sealant:
- Under the mastic asphalt emulsion is applied to liquefy the paste-primer;
- Apply basic layers of bitumen emulsion mastics (number of layers depends on the slope of the roof);
- Do extra reinforcing layer of mastic mastic to strengthen the carpet in areas of high moisture accumulation;
- Arrange a protective layer in the form of coating, dressing of coarse sand or fine gravel, coloring.
Binders used in the manufacture of bituminous mastics, are artificial asphalt, resulting from oil refining and tar residues.
Petroleum bitumen black or dark-brown color when heated to viscosity changes. Depending on the viscosity are divided into solid, semi-solid and liquid. Solid and semi-solid oil bitumen used for building and roofing (manufacture of roll roofing and waterproofing materials, bituminous mastics and coatings), and liquid - as impregnating a base material rolled roofing materials. When using bitumen must skillfully select brand bitumen, depending on the application.
Mark asphalt installed by its main properties: viscosity, elasticity, softening temperature and fire.
Viscosity measure of the depth of penetration of the needle, and is measured in millimeters. The greater the depth, the lower the viscosity.
Indicator is the length of the stretch of bitumen stretched sample at the time of the gap (measured in centimeters).
The softening temperature characterizes the suitability of bitumen for use in different temperature conditions.
Petroleum bitumen stored in special warehouses or under a canopy protecting them from the action of sunlight and rainfall.
Bituminous mastic is a homogeneous mass consisting of bitumen, fillers and additives. It is used for bonding and adhesive roll materials when multilayer roofing, waterproofing, roofing mastic
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