The main requirements at a choice of a
roofing material are:
Appearance
Service time
The method of installation
Weight, thermal stability and porosity of a material
The price of the complete set of a roof
Depending on type of water isolation layer, appearance and the size of a roof are subdivided into 5 principal views:
rolled, ripe, membrane (film), sheet and type-setting (piece). Besides, roofs conditionally divide on two big groups: roofs in city building and a roof for cottages and summer residences.
Rolled roofs are made of bitumen and bitumen-polymeric materials with a reinforcing basis (synthetic, cardboard or film). Most widespread of rolled roofing materials are glassoid, roofing material and roofing felt. A basis for all of them is the cardboard. The basic lacks of roofs from glassoid, roofing material and roofing felt are their fragility, low frost resistance and susceptibility to rotting.
Rolled roofs from bitumen-polymeric materials have in a basis polyester not giving in to rotting, fiber glass fabric or glass-canvas. Addition in bitumen of polymeric modifiers gives to a roofing material thermal stability and frost resistance, prevents formation of cracks and, hence, increases durability of a covering. A roofing carpet lay a method fusion on the bases from concrete, metal or paste by means of mastic.
A ripe roof is the polymeric membrane formed directly on a surface of a roof (a bulk roof). Ripe roofing coverings receive at drawing on the basis (usually concrete)
liquid-viscous oligomerous products which form a continuous elastic film on a surface. Mastics have good adhesion to concrete, metal, bitumen materials.
The ripe roof represents one- or two-componential structure which is put on a surface of a roof in the way bulk (a bulk roof). After hardening the covering looks as monolithic, rubber-like a material.
In roofing mastics are inherent firmness to excited environments, oxidation and Uf-radiation, anticorrosive firmness in a range of temperatures from-40°C to +100°C, high durability, elasticity and easy weight.
Membrane coverings. For roofs of industrial, public and other buildings with small biases and strong (for example, concrete) the bases interest is represented by membrane coverings. The membrane is made from highly elastic rubber-like a polymeric material with relative lengthening of 200-400 % and high durability on a stretching and a puncture.
One of the main advantages of membrane coverings is speed of the device of roofing coverings of the big areas. Panels move on a roof in the combined kind, developed and keep within on the basis. Panels are joined by with each other self-vulcanized tapes. They carry out adjunctions.
Sheet roofing materials. A special place among sheet roofing materials occupy profiled. One of the first have appeared asbestos - cement sheets (slate), then — wavy sheets from the zinced steel and aluminum, and, at last, bitumen-cardboard corrugated sheets and a metal-tile.
- Asbestos - cement wavy sheets (artificial slate) serve till 50 years.
- The steel zinced sheet (equal or goffered), - durable and essentially less fragile roofing materials. Service life of such roofs — more than 50 years.
- Bitumen-cardboard wavy sheets are known under different firm names (Euroslate, Ondulin, Aqualin and so on). Euroslate is much easier than a steel sheet or slate, possesses high elasticity, is convenient in work, but its durability essentially more low, than at slate and doesn't exceed 25-30 years.
- The metal-tile is a version of the steel zinced sheet with the polymeric covering, exposed to profiling for reception of the drawing simulating a natural tile. Its rather small weight, simplicity of installation, long term of operation, ecological safety concern the basic advantages of a metal tile. A metal-tile lack is its raised in comparison with other kinds of a roof ability to resound during a rain, snow motions, etc.
Piece roofing materials. The most ancient piece materials are wooden elements (a shingle), and also a ceramic tile and natural slate.
Advantages of a natural ceramic tile — esthetic appearance, reliability and durability, fire resistance, stability to sunlight, acid rains and temperature differences. Also a ceramic tile appreciate low heat conductivity, ability to absorb noise and not to accumulate static pressure. One of lacks of a tile roof is its big weight, therefore under it the design is required powerful bridle equipment. However it is not necessary to forget that the more hard a roof, the is better it resists to flaws and a bad weather. Besides, the tile roof doesn't demand almost any leaving and serves more than 100 years.
Modern version of a tile is
the concrete or cement-sandy tile. The cement-sandy tile is less durable, than ceramic, and on other parameters is close to it. It is slightly easier ceramic, but, nevertheless, its use for roofs of easy constructions isn't recommended.
The metallic tile (not to confuse to a metal-tile) represents the profiled zinced steel sheet with mineral granules in acrylic binding on a surface. Such tile well simulates the ceramic.
Recently on roofs of country houses it is possible to see a covering from multi-colored thin tiles of the rectangular or six-coal form is a so-called
soft (flexible) tile. A basis of a soft tile is the glass fibre, the cellulose or asbestoses cardboard, impregnated with bitumen or rubber-bitumen and covered with a mineral crumb. The bottom surface of a soft tile represents a self-pasted layer from rubber-bitumen. Such roof is convenient for mounting, especially on roofs of a difficult configuration. The weight of a covering on 1 rec.m. makes 8-12kg, and covering service life — 30-50 years.
There are also other roofing materials (for example, a slate tile), but they haven't received a wide circulation.