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How Long Will Shingles Last

How To Top Retirement? Roofing

By Samson Sargsyan on February 17, 2012

How long will last the roof? When asked about the cost per square meter cover this issue, perhaps the most important for anyone who builds a country home. On what factors affect the longevity of the roof, and discussed today. Experts understand the longevity of the life of a structure or material losses of up to 50% of the basic physical and mechanical properties.

The durability of the roof

How long will last the roof? When asked about the cost per square meter cover this issue, perhaps the most important for anyone who builds a country home. On what factors affect the longevity of the roof, and discussed today.
Experts understand the longevity of the life of a structure or material losses of up to 50% of the basic physical and mechanical properties.

The service life of the roof depends on the durability of two components: the roof and supporting its construction. At the same time we must not forget this simple truth: all the elements of the roof is inextricably linked to each other, so that the loss of property by one of them will affect the longevity of the roof as a whole. No matter how great may have been the material of the roof, if the wood base underneath rotten - the roof will stay a long time. Conversely, even the excellent performance of the base, sooner or later will become worthless when the roof has defects. In addition, it is necessary to bear in mind that depending on the state and condition of the roof trim on the premises, located underneath (especially exploited attics - attics).

Another time. Roof - part of the architectural image of the building, which means that if after years of coating material is protective, but it looks ugly, its life came to an end. So long life - it is also "the ability to" maintain an acceptable roof appearance.

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What are the main influence on the roof? Precipitation (rain, snow, hail), wind, ultraviolet radiation, temperature, vital functions of insects and microorganisms, the mechanical load. In principle, the majority of modern roofing materials is good at these "plagues" within the design life. Written guarantee on soft tile is typically 15-25 years, metal roofing - 5-15 years, natural tile - 20-50 years old, on granite - 50 years. At the same time the producers believe that the real life of a soft metal, and at least 2-3 times greater than the warranty, and natural tile and porcelain can be up to 100 years old.

In many ways, durability of the material depends on its quality. So, if you choose Soft tiles should first be taken with special attention to its heat and cold resistance, ie the ability to maintain its shape at different temperatures. The basis of soft tile - non-woven glass fiber or polyester, soaked, as a rule, the modified bitumen. That's a modifier (polymer additive) determines the reaction of the roofing material to heat and cold. Most often, modified bitumen APP (atactic polypropylene) and SBS (styrene-butadiene-styrene). Talking about the superiority of one supplement over another is difficult. For example, heat resistance of APP reaches up to 140 C, and SBS - only up to 100 C, but at the same time last frost modifier above. Therefore, each suit your climate zone modifier. With regard to our changeable climate, this will be the durable soft tile, which has an optimal ratio of polymer and bitumen.

The next important characteristic for soft tile - resistance to UV radiation. It affects, firstly, the presence of the same modifier: bitumen with polymer additive for longer retains the physical and mechanical properties under ultraviolet light than the unmodified. Secondly, the quality of the upper cover tiles - a layer of basalt or mineral granules. Stone chippings bitumen from the closing of "bad" for him the sun, so the higher the percentage of the surface, closed crumb, the durable tiles. Third, resistance to UV radiation is associated with a measure of adhesion to bitumen granules: the loss of dressing shall not exceed the requirements of GOST and European norms, or bitumen with time, "bare" and will quickly grow old.

The lower surface of the soft tile, usually partially covered with a layer of silica sand, partly self-adhesive layer rezinobituma. The latter is responsible for sealing roof membrane, because after a while under the influence of sunlight it "tightly" glues together with neighboring shingle shingle. In order for soft roof lasts a long time, the area of adhesive layer must be at least 15% of the surface area of the shingles (a well-known manufacturers, this layer is between 50% and above). Otherwise, sufficient tightness will not be achieved. It is also important to understand that from the adhesive layer determine the fate not only of a shingle, but the whole surface.

Finally, it has a value base bitumen-polymer material, which determines its tensile strength. This is especially true for the valley of carpets, flooring in the valleys and places of contiguity, where the roof is subjected to the most serious pressure of water, snow. This means that the tensile strength in the valley of the carpet must be greater than ordinary shingles.

Metal is usually seamless steel corrugated sheets, coated with zinc and polymer layer. Physical and mechanical properties, and hence, the durability of the roofing material is determined primarily thick steel plate and a layer of zinc, as well as the type of polymer coating. The latter factor determines, in particular, the color stability of sheets. The thickness of the steel sheet used for the manufacture of metal, is 0.45 - 0.6 mm. The thinner steel, the easier it is deformed during installation and subsequent operation. But we have a thickness of 0.55 mm or more because of the stiffness can be problems with profiling. The result - a violation of the geometry of the sheet and clearly visible seams between the sheets, not the best way affects the appearance of the roof. A layer of zinc protects steel from corrosion, so it is thicker than the longer "live" metal.
On both sides of galvanized steel and passivated necessarily primed (ie, covered with a layer of "saving" the zinc from oxidation, and adhesive), and then it should bear the primary polymer coating. The absence of a passivating layer and the primer will shorten the life of metal up to 1-3 years.

Durability of the sheet depends on the type of polymer coating. Thus, the polyester has a high color-and heat (can withstand up to +120 C), good corrosion resistance and UV radiation, but due to the small thickness (25-30 microns) is not too strong. Plastisol by a substantial thickness (200 microns) are highly resistant to mechanical stress and corrosion. However, he was "afraid" of ultraviolet rays, and the maximum temperature at which it does not lose its properties +60 C. PVF2 coating almost does not fade, can withstand temperatures as +120 C, and -60 C. However, its thickness - 25-27 mm, so it's not the most durable material. The optimum coating for metal, many experts believe pural. It is distinguished by resistance to corrosion, UV, mechanical wear (thickness - 50 mm), the ability to withstand both high temperatures (+120 C), and large diurnal temperature variations. Note that the choice of metal should pay special attention to the warranty, which is given to the polymer coating.

A special place among the metal roofs of corrugated sheets is occupied with a base made of steel coated with aluzinc (55% aluminum, 43.5% zinc and 1.5% silicon). An alloy of aluminum and zinc protects steel from corrosion in 2-4 times more efficient than conventional zinc. In addition, these sheets are very heat resistant. Therefore alyutsinkovym coated metal will last much longer.

Some companies manufacture metal roofing with a facial layer of mineral granules, embedded in a polymeric binder. In this case the durability of the material is primarily due to the quality of the binder.
Manufacturers recommend the use of their material with self-tapping certain brands and only if you follow this recommendation, give a written guarantee to cover. The fact that the cheap screws a little life, largely because of poor quality plastic washers to ensure sealing of openings, which are wrapped in a self-tapping screws.

The main characteristic that affects the durability of ceramic and cement-sand tile is frost, which in turn depends on the degree of water absorption, density and porosity of the tile. Experts say that the water absorption quality tile should not exceed 5-7% by weight of the tiles, then cover permanently retain their properties. Moreover, the higher density and lower porosity, the less moisture gets inside the tiles. A moisture - one of the main "destroyers" tiles: the temperature drops the moisture that gets into the pores freezes and expands, gradually breaks down their walls. In addition, the high porosity increases the permeability of tiles (the ability to pass water under pressure). Thus, high-quality natural tile must have a minimum amount of time.

Frost resistance of ceramic and cement-sand tile is measured as follows: in the laboratory tiles immersed in water with a temperature of +20 C, then wet the product for two hours is placed in a chamber with a temperature of -20 C, after which it again thawed in warm water. One is a "journey" is called a cycle. By European standards of ceramic tile to withstand at least 150 cycles of freezing and thawing. A "ceramics" individual producers can go through 1, 000 cycles is not cracked. Up to 1000 cycles of frost comes indicator of cement-sand tiles (note here that in actual operating conditions of extreme temperature changes do not happen).

Other important characteristics for natural tile - resistance to UV and flexural strength. Modern manufacturing techniques allow the tiles to achieve a high color fastness of it. As for strength, that some manufacturers of cement-sand tiles one tile can withstand up to 250 kg. Quality ceramic tiles almost as strong.

Durable stoneware is due primarily frost. As already mentioned, the frost is directly related to moisture absorption, which depends on the porosity of the material. At the minimum number of porcelain stoneware has achieved only by special technological methods. First, the raw material mixture is baked at very high temperatures - up to 1300 C, with the result that she literally floated. Secondly - and most importantly - to be treated a lot of news crushes - 800 kg / sq. cm or more than one thousand tons per tile. Executed in this manner Porcelain tile has a low moisture absorption (0.1%) and as a consequence - high frost resistance.

Porcelain tiles painted in the mass, which is the key to its color stability. On the other hand, retain the color of tile for a long time, only when the moldable mass added in the production of highly stable pigments containing salts of rare earth metals (cobalt, zirconium, chromium).
Of particular importance for the longevity of the roof has a mechanical strength of the coating. Some manufacturers of granite tiles have achieved that its specific flexural strength of 65 MPa, thus covering a square meter can withstand snow loads greater than estimated for the central part of Russia. In addition, the service life of the roof affects the hardness of granite.

One of the longest tenure in the roof of copper, "stand" of 150-200 years without any maintenance costs were not a problem for her. Rusting roof of this material is simply "can not". And, covered over time or due to special technology malachite-green patina, it only gets stronger. Although this has a very high coefficient of thermal expansion, which affects the stability of its nodes.

Up to 100 years could "survive" the roof of the zinc-titanium alloy, due to its high resistance to corrosion. In the silvery leaves contained less than 2% of titanium, but it was he who gives them strength.

The design of the roof

As already mentioned, no matter how perfect was the roofing material, it does not last for long if mistakes are made in the roof structure. Must be in accordance with SNIP to calculate the cross section and the step of rafters and sheathing (or the thickness of the solid floor) as well as to organize the "roof pie" if under the roof of your house is an attic.

In most cases, it involves a vapor barrier, insulation and waterproofing. It is important to consider the following. First, the roof of the unit depends on the type of waterproof tape. Vapor-proof film or in part, vapor-proof (usually with anti-condensate layer) must be installed with a clearance with respect to insulation, and roof, forming two cavities for air movement. Permeable ("breathable") membrane can be laid directly on the heater, while there is only one vent gap. Second, the "stuffing" the "pie" is due to the type of roofing material. Since the inside of the metal, and - to a lesser extent - natural tile condensation can occur, it is desirable to use these materials with water-proofing film with anticondensate layer. Roof "pie" under natural shingles, such films also protect from blowing snow in the gaps between the tiles. And in the case of soft tile roof construction is complemented by a solid base of waterproof plywood grade FSF, OSB-3, planed or cut timber, so the film with anti-condensate layer is not necessary, so that commonly used "breathable" membrane. Moreover, the use of plywood nevlagostoykoy significantly reduces the service life of the roof.
Often, customers are trying to save, putting a layer of insulation with a thickness less than that provided SNiPs for this climate zone. The result - the loss of heat from the house.

Obligatory condition of the roof longevity - the proper organization of roof space ventilation. Ventilation is necessary, first, wooden structures to prevent their decay, and secondly, a heater, so that it is not watered water vapor, which is always in some quantity in the air. Lack of or poor management of ventilation leads to the fact that the insulation gets wet, and the house through the roof loses heat. To avoid this, it is necessary to arrange the eave overhang clearance for ventilation air flow under the surface - an opportunity for his free convection, and in the vicinity of the ridge - the hole for its exit. Often the need to strengthen the ventilation air by means of special items. The correct calculation of the amount of roof ventilators and places where they should be, is another factor that increases the lifespan of the roof.

Another time. For each roofing material is strictly regulated by the possible angles, and depending on the angle of inclination of the device frequently changing the roof. Thus, the minimum angle for the roof of metal - 14?. Soft tile is not used on the roof with a slope of less than 11.3?, And at an inclination of 11.3? to 18? across the surface slope is set extra waterproofing - lining the carpet. The optimum pitch for natural tile - of 22? to 60?. When a slope 10-16? must be mounted solid wooden flooring, which is fused to the roll waterproofing.


A quality installation of a further condition of durability of the roof. You can buy an expensive roofing material, but negate the beauty of its reliability and styling with a violation of the technology. Worst of all, when the error occurred during the device "a roofing pie, " because the customer does not see that happening under the roof. And he understands "something wrong" when it is already beginning to deteriorate interior or icicles "clusters" hanging from the eaves.

Meanwhile, similar mistakes - the card of most teams shabashniks. Here are a few examples. Casually place glue laps roll vapor barrier, the result - water vapor, which has a high diffusion (permeation) ability, falls into the insulation and moisturizes it. Or, loosely pinned to each other insulation boards, formed a "bridge cold" and condensation again. Or stand on the slope around the ventilation gap between insulation and roof covering, made the air outlet, but tightly stitched lining overhang the eaves by closing the air to a roof. No less common errors associated with the device valleys, junctions, ventilation and antenna terminals.

... Miser pays twice. It's true. Better once to hire qualified installers, you pay shabashniks first, and then the professionals.

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