Roofs

Roofs determine to a great extent the length of life of buildings. Cellular Fibro Concrete, which is lightweight, possesses high frost resistance and good thermo- and sound insulating properties, is a very suitable material for construction of flat (level) roofs. For construction of sloping roofs most effective is the use of pre-cast slabs or panels from CFC.

The steps for building flat roofs with cellular concrete are quite similar to the steps in floors. The main difference is that after hardening of the material in 3-7 days the cellular concrete layer is covered with a 1-2 mm layer of single component rubber (bitumen). On top of it is laid glass fibre cloth and another 2-3 mm layer of bitumen. This way the roof is protected from moisture. The procedure is simple and replaces the traditional multi-layer "pie" of flammable roll materials.

 

Project: Roof reconstruction in Noginsk Weaving factory, client "Optim-Alt" Ltd:

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There were 36 glass covered openings in the roof of the building, the so called "lanterns" with dimensions 31 m х 2,2 m, which had to be replaced and the roof had to be covered with a thermo- insulating material. The work was done using a simple concrete mixer.

Construction:

  • I-beams with spacing 2,2 m;
  • trapezoidal sheet;
  • reinforcing net in two layers with spacing 10 cm;
  • cellular concrete CFC-350 - 20 cm;
  • sand-cement screed - 2 cm.

Slabs

Due to its light-weight, thermo- and sound insulating properties the CFC cellular concrete is successfully applied in slabs. The general application is similar to that of roofs and floors.

 

Project: Pouring slabs in Moscow, Russia, client - a warehouse complex owner:

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The work was done using a plaster machine station. Thickness of the slab - 300 mm. Trapezoidal sheets were used as retain form-work, height of the trapezia - 75 mm, width of the sheets - 800 mm. Construction mesh was used to additionally reinforce the slabs.

Gaps were sealed with thicker mixture to avoid leaking of the liquid cellular concrete. Then a layer of 100 - 120 mm of CFC was poured on top of the slab. It is important to be able to pour the calculated quantity of CFC before the expanding process of the material has begun. Two hours later the whole volume up to the tops of the horizontal beams was filled with the expanded cellular concrete.

After the CFC cellular concrete has acquired initial strength (1-2 days) the second layer of construction mesh has been installed and the rest of the cellular concrete has been poured taking in consideration the expanding of the material to the top of the horizontal beams (100 mm). The third finishing layer 1-2 cm was made applying self-leveling floor screed. On top of the layer can be walked in 2-3 days.

Floors

Floors of buildings are subject to different loads, wear and tear. Requirements to floors are formulated in the plenty technical and regulatory documentation. In conformance with requirements to low and medium loaded floors with unrestricted inundation the dry mix CFC cellular concrete is totally suitable and applicable.

 

Project: Thermal and sound insulation of floors in Sofia, Bulgaria, client "Mall Paradise":

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The floors made of cellular concrete are mulit-functional. Cellular Fibro Concrete is a reliable and long lasting material for floors with its water resistance, sound and thermo-insulation qualities and lightweight. Floors of CFC are free of harmful to man's health components. They are second after wood in hygienic properties. They are heat and fire resistant and at 1000 Grad С they last quite long and do not produce harmful gases. Floors of Cellular Fibro Concrete are easily repaired, encapsulating pipeline, electric and other commucations. Besides that cellular concrete of CFC dry mix allows to complete in just a few working cycles the traditional multiple cycles needed to complete the multi-layer floor constructions, and at much lower cost.

The following is taken under consideration in cellular concrete floor construction works:

  • technological requirements;
  • the quality of the row material or mixture;
  • method of laying, mouldwork, size of priming cards;
  • positions and sizes of the cut sections;
  • temperature of the used water, mixture and surrounding air;
  • humidity of the air, weather stability;
  • hardness, density, cracking;
  • shrinkage and water resistance.