Advantages of lime products
The lime it is one of the most used materials in construction and is certainly the oldest binder used since ancient times for masonry.
It is the basis of masonry mortars and from plaster: in the first case we are talking about binder for building materials, in the second of finishing, therefore, used for painting, wall decorations, etc.
I benefits are remarkable: lime products have an excellent degree of breathability, hygroscopicity e porosity, such as to make the walls able to breathe, resistant to the formation of mold and the attacks of the salts contained in the ground, which could attack the masonry through rising damp. These features make of lime plasters a reliable, long-lasting product capable of contributing to living comfort.
Even the respect for the environment it is guaranteed: compared to other building binders, lime is distinguished by the lower emission of carbon dioxide, thanks to the low firing temperatures and the partial reabsorption of carbon dioxide during installation.
It is therefore also used in the context of green constructionsas environmentally friendly material: if combined, in fact, with other innovative solutions and devices, it can actively contribute to the creation of a sustainable home.
Lime-based mortars and plasters
Among the various products on the market, Saint-Gobain Italia offers high quality lime products, thanks to the long tradition and experience gained internationally by offering numerous solutions that contribute to the success of the environments in which we live, significantly improving living comfort.
The products of the range webercalce of the Weber brand are, in fact, free from toxic substancesbreathable and moisture regulators, absorbing excess and releasing it only when necessary.
For this reason, they are indicated in both old artifacts with high levels of humidity, both in new buildings where the opposite problem of too dry air is created.
As evidence of the degree of sustainability, all the products in the range are certified in class A +that is the maximum degree in the evaluation scale, according to the French model (Decret 321-2011) which identifies products with low VOC emissions, i.e. volatile organic compounds.
Finally, they are perfectly combinable with thermal insulation systems, thus creating a complete package for masonry. Let’s see how to build and plaster with lime according to tradition with the Saint-Gobain Italia products
Lime-based products for exposed walls
webercalce malta M2,5 is a premixed mortar for masonry, of natural hydraulic lime NHL 5, specific for external and internal elevation walls of class M2.5, made of brick or stone.
It is a powdered lime and can also be used for filling traces and for stylizing stones.
webercalce malta M10on the other hand, it is perfect for interventions in Seismic zone, as it is an M10 class NHL5 natural hydraulic lime fiber mortar, again for the elevation of masonry and the laying of exposed stone. These types of products are therefore perfectly suited for restoration or conservative rehabilitation interventions, even of historic buildings.
The installation must take place beforehand cleaning e dirt removal e of the dust from the blocks or bricks to be laid, which must be slightly moistened before laying and building the masonry. The tools used are: cement mixer, kneading machine and trowel.
Traditional lime plaster
webercalce into G e webercalce into F they are two types of traditional plasters, with different granulometry, coarse and fine; they are based on NHL5 natural hydraulic lime, and can be applied by machine and by hand, suitable for internal and external surfaces.
They are ideal for the recovery of buildings of historical and architectural value, but also for the breathable plastering of new buildings designed according to the criteria of environmental sustainability; they are perfect on bricks, thermo-bricks, mixed stone masonry, blocks in lightened, cellular or wood-cement concrete, on tuff and other types of stone, after checking the consistency of the substrate.
On the other hand, they are not suitable for flimsy, frozen or painted substrates.
The drafting of the products at the base of lime mortar it has to happen, however, on stable supports, resistant e clean; the ancient walls must be subjected to water pressure washing or sandblasting until all traces of dirt, weak or insubstantial parts and any saline efflorescence are completely eliminated.
In the event of poor consistency, it will be necessary to first apply one plaster holder net and render using webercalce into G.
All media must be wet to waste and the application of the plaster must begin with total absorption of the water.
The plaster, in addition to having the role of protecting the facade and therefore the underlying structure, has over time taken on the function of preparation for characterization e customization of the facade.
For this reason, above it it is possible to apply a finish suitable for uniforming and supporting the decoration; two products can be used in the webercalce range: webercalce shaving e webercalce shaving L.
The latter, in particular, is a smooth white finish with excellent smoothness, the advantage of which is a more elegant surface and which allows the walls to be finished with fine paints and decorative effects.
I suitable supports to the application are:
- traditional plasters with natural hydraulic lime;
- Lime-cement premixed plasters;
- renovation plasters;
- lime-cement mortar;
- cocciopesto-based mortars.
However, the following are not applicable:
- on synthetic coatings or paints;
- inconsistent, crumbling or degraded plasters;
- supports with irregularities greater than 4 mm.
Before writing, the surface must be thoroughly wetted, especially in the case of cured plasters. For new plasters it is advisable to wait one day for each mm of plaster thickness before applying the smoothing compound.
Once applied, the product is suitable for receiving weber.cote calcecover L lime paints, weber.cote sanacover L restoration paint, acryl-silicone paints from the weber.cote siloxcover line and silicate paints, paying attention, however, to at the time of maturation of the support.
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THE EDITORIAL RECOMMENDS
The world of construction is full of products of the most varied technical qualities, for this reason to choose the right product it is good to rely on specialists in the sector such as, Saint-Gobain Italia is a world leader in the production of premixed products for the building industry, with a wide range of solutions based on advanced technologies and formulations in order to meet the highest technical requirements. Weber lime plaster it is just a family of these.
The weber edilizia products provide for the development of innovative solutions developed in direct collaboration with the customers guarantees quality, safety e competitiveness.
It is widespread worldwide, but respect for local peculiarities is guaranteed by a widespread presence in contact with customers in 57 countries.
For more information, visit the website www.it.weber
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