Service life of roof slate - GOST standards
Despite the fact that production volumes are decreasing asbestos cement, the incredible interest on the part of developers to the slate roof does not decrease, rather, it even increases for one extremely important reason - the service life of slate on the roof in accordance with GOST,
even under adverse conditions, much more in modern metal and bituminous roofs.
Despite the period of active industrial development and use of asbestos-cement material more than 100 years, it is necessary to know and confirm the operational period of wave-type slate by an authorized representative government services and organizations did not succeed. This issue was diligently bypassed by the legal offices of the USSR Ministry of Construction when developing GOSTs (the fact is that they were in charge of developing the service life of slate and other materials for the roof).
At the moment there are three main standards that will determine the requirements for slate sheets, its dimensions and parameters, the method of roofing from slate sheets:
- USSR State Standard No. 20430-84 on slate sheets of profile 40-150.
- More detailed and old GOST 16233-77, according to which the requirements for corrugated sheet slate for roofs, profile from 54 to 200 are established.
- The last updated SNiP II-26-76 from 2010 on arrangement of various types of roofing, including under a roof made of slate.
None of the documents that are given above regulate the operational life of the slate, and moreover, there are no indications or formulations about the fact that the slate roof is disposable. There are certain instructions on the methods and quality of reception, transportation of slate, but there is nothing that can be applied in order to determine the service life.
In reality, this is definitely not an inaccuracy and not an error of the designers of standards for operational periods.
The lack of specific time frames is due to the fact that slate is just one of the many roofing elements and materials. According to the norms, the operational life of a slate roof is determined taking into account the structures of the battens made of wood and rafters, as well as the state of the insulation. Both such elements fail much earlier than slate. In the construction documentation for the latest buildings, the operating period or warranty for slate sheets is deliberately limited to 15 years, although with good quality materials and maintenance, slate can last up to 75 years.
For the roof, builders mostly use corrugated sheets of asbestos cement of various sizes with many advantages, and the operation of the slate roof itself is 30-40 years.
Asbestos cement slate can be used both in gray and in other shades.In addition, in a painted state, in addition to its waterproof natural properties, it still does not allow moisture to pass through due to a protective paint and varnish layer. In addition to asbestos-cement slate, the following types of material are widely used:
In addition, when covering the roof, you can use more expensive and advanced materials, such as Euroslate.
Naturally, it is necessary to clean the roof from time to time, make sure that it does not overgrow with moss, and at the same time smear it with primer penetrating solutions that increase the waterproofing and durability. Roof coloring also contributes to its preservation.
There is such a rule, according to which the warranty for the product is determined as 50% of the service life, which is determined by the results of the static observations under normal conditions. It turns out that the period for calculating the operational life of the slate is about 30 years. But even this value may seem underestimated, because in reality, in practice, you can see houses with slate roofs that are more than 45 years old.
At the moment, roofing made of slate sheets is considered the most popular for small-sized auxiliary buildings. Everything is covered with asbestos-cement sheet - chicken coops, cowsheds, garages and storage facilities.
The material is bought in large quantities, and there is no talk about the service life of the slate until problems with the roofing leak are discovered.At the initial stage, it is imperative to pay attention to the conditions that will ensure the service life of the roofing building material:
The main factor that determines the reliability and durability of a slate roof is only the quality of the material.
If the asbestos-cement sheet is made of high quality fiber, produced in the city of Asbestos, and not bought cheaply from firms from China, and then with a 90% probability we can say that the resource is at least 20 years.
Due to the lifespan of slate on the roof of a house, many people choose this material. The most popular reasons for reducing the service life of asbestos cement are cracks in the material, unsuccessful hammering on nails or improper installation of roofing material. To increase the roofing resource, you need to avoid the most popular mistakes:
This makes it possible to avoid splitting of fragile sheet material during deformation of the battens.
Good advice! When planning the use of asbestos cement as a roofing, it is imperative to follow the recommendations of SNiP II-26-76.
All improvisations with a step or frame material usually lead to a tangible reduction in the material resource.
The device itself of the asbestos-cement sheet and the recommended fixing schemes were not invented, nor were they taken from the ceiling, and in fact, this is only a generalized experience of using an asbestos-cement roof over many decades of its existence.
A more problematic and difficult situation is when it is required to extend the service life of a slate that has long been laid and fixed on the roof lathing. Over time, asbestos cement will only become stronger, and during this time the grain of cement and asbestos fibers is gaining the maximum possible strength. But only if the asbestos cement is painted with a protective paint and varnish material, or the slate sheets were not laid on the roof, but were stored under awnings. A simple roof sheet under the sun begins to degrade, become covered with microscopic cracks, and rain will wash out the grain and destroy the chrysolite fiber.
First of all, the roof must be cleaned at least once every 10 years from fungal spores and dirt, plant seeds and garbage.To increase the roofing resource, it is enough to wash out the surface with a strong water jet, dry and paint asbestos cement with a rubber paint and varnish material. The second point of the plan for increasing the resource can be considered repair work and the renewal of the bearing crate capacity. If the roofing sheets of asbestos cement begin to flap in a strong wind, then the insulation layer and steam insulation are removed from the inside of the coating. Separate sections of the lathing are glued to the asbestos cement by means of a sealant, the decayed areas are reinforced with wooden linings or they are fully replaced with new slats.
In order to restore and increase the service life, it is necessary to check the condition of the nails with which the sheets are nailed to the timber slats. As a rule, branded nails have grooves or notches that prevent the fastener from being squeezed out of the wood.
But even such nails oxidize, begin to rust and easily come out of the lathing wood. For this reason, replacing the nails with a new fastener will remain the best method to increase the resource and service life.
If the nail heads just rose above the wave by 0.
5-1 cm, then for repair work it is enough to add a little sealant into the hole, and then deposit the mount in place. If the nail will loosen with ease by hand, then it is best to pull the mount out of the crate, add adhesive or paint, and hammer in a new mount.
The service life of wave slate on the roof with good care will increase the operating life on the roof to the desired and quite realistic 35 years is not a particular problem. The main thing in this matter is to choose high quality material, even after 30 years of being on the roof, asbestos-cement sheets can retain their original strength, and therefore you should not rush to throw away the roof covering when dismantling the old structure. The material can be sold or used for a bathhouse / shed.
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