Energy-efficient foundations: the benefits and features of UWB

General information about the foundation warmed Swedish Stove: pros, cons, what materials to use in the construction, the main stages of construction

construction technology low-rise town houses are improving every year. The basis of the house - the foundation. In European countries, popular warmed slab shallow foundation - UWB. What are its advantages? On this, we, with the help of TekhnoNIKOL and REHAU company specialists explain this part of the training course Insulated Swedish Stove: instructions for implementation of the slab foundation with engineering systems.

Content:

• What is the foundation of UWB
• What are the materials used in the construction of a UWB
• The main stages of construction of a UWB
• Advantages and disadvantages warmed Swedish plates

What is the foundation of UWB

UWB - a slab foundation with a shallow drainage system, warmed under the entire sole and around the base. A key feature of UWB - in board integrates all the necessary utilities:

• Low temperature heating - water floor heating.
• Water pipes and sewage systems.

Furthermore, the surface of UWB is, due to the alignment, ready rough floor of the first floor, which can be directly laid floor finish. For example, ceramic tiles.

Thus UWB - not just a foundation, and a highly efficient system with all the built-in communications for a country house.

UWB foundation came to Russia from Europe. It is believed that the first time it has developed the Swedish company Dorocell. Then he spread the Nordic countries and in Germany. In recent years, this foundation has acquired great popularity in Russia. UWB put on frame and wooden houses, solid houses, the house of aerated concrete, arbolita warm and ceramics. T. a. UWB is well insulated, it is often used for the construction of energy efficient buildings with a closed-loop heat without cold bridges.

After neuteplonny foundation lost part of the thermal energy which has developed a system of heating.

Despite the advantages of UWB and well established technology of construction, from domestic developers, there are many issues related to the nuances of its construction and operation.

What are the materials used in the construction of a UWB

Among builders popular "myths" that UWB is too expensive. Complicated in the construction. But the most important fears stem from the fact that the insulation is in the soil under the foundation, and all communications in the walled plate. There are doubts in a series of what-if:

• Thermal insulation does not serve to put her life?
• Deforms under the weight of the home or fed with moisture?
• Floor heating pipe or water will flow?

Are these fears justified?

Kirill Paramonov

Head of Technical Services "Thermal insulation materials XPS» Corporation TekhnoNIKOL

For foundation UWB device is optimally suited extruded polystyrene (XPS), brand TECHNONICOL CARBON ECO SP. Due to its physico-mechanical properties, the material has a low thermal conductivity coefficient(0.034 W / (m * ° C) in operation "A and" B "). Additional Performance insulation note:

• Compressive strength at 10% deformation, of at least 400 kPa.
• water absorption ratio of not more than 0.4% by volume.
• The service life of XPS in the ground for at least 50 years.
• The material is chemically stable and does not rot.

Add that extruded polystyrene TECHNONICOL CARBON ECO SP practically does not absorb moisture, biopassiven, t. E. It does not attract rodents, and is not subject to the adverse effects of pests.

Light weight and easy handling insulation, simplify all the work on the construction of a UWB base. Plates CARBON ECO SP are increased size - 2360 mm (conventional plate XPS - 1180 mm), which also reduces installation time. Extruded polystyrene can be easily cut with a knife or hand hacksaw, but based on the plates quickly assembled side members (L-blocks) by which the contour is formed future structure.

Due to the peculiarities XPS CARBON SP speed construction of the foundation is increased by 30% in comparison with, for example, a ribbon of deep foundations.

Kirill Paramonov

L-blocks are formed from plates XPS, using adhesive foam and fastening elements - corner fittingsXPS TECHNONICOL, and screw fasteners.

A key advantage of UWB technology - after laying of concrete and set them with the necessary strength, L-blocks extruded polystyrene foam is not necessary to dismantle, and they are already prepared thermally insulating element foundation.

Now dwell on engineering services for UWB. As mentioned above, in the plate zamonolichivayutsya floor heating pipe, which are part of a low-temperature heating system.

Radiant floor heating, due to optimal temperature distribution in height premises and radiant heat exchange, provides a person an increased thermal comfort.

Sergey Bulkin

CTO direction "Internal engineering systems" company REHAU

For floor heating device can be used in UWB pipes of crosslinked polyethylene PE-Xa RAUTHERM S. These pipes have the best thermal conductivity, capacity, mechanical strength, reliability and durability. The piping is certified under GOST 32415-2013 for 4th class of operation (low temperature heating). Pipe diameter is selected in the hydraulic calculation of the standard series 14, 17, 20 mm (outer diameter of the conduit) based on such that hydraulic losses the most unfavorable loop in the system (the most extended and the most loaded) do not exceed 30 kPa.

Pipelining linked polyethylene PE-Xa be conducted at ambient temperatures from + 50 ° C to -10 ° C. Pipes are joined by sleeves installation of couplers, which increases the speed of assembly and ensures tightness of connections.

Among the advantages of pipes RAUTHERM S distinguish:

• Pipes are different from other series of smaller wall thickness. Due to this, the thermal conductivity of the tube material is increased by 6%, and bandwidth at the same coolant velocity is increased by 20%. Thus, one square meter of surface, with this pipe, we get 26% more heat than when using pipes of other brands.
• Pipes can be bent without fracture to a radius of diameter equal to 5, which is very important, ie. K. A outlines floor heating pipes are laid with a small step and constantly change the direction at 90 or 180°.
• As pipes and fittings, joins them on the slip-on sleeve, reliable and durable. Pipes are resistant to mechanical stress, both during their assembly and during pouring UWB. Fracture or mechanical deformation of the pipe which allow the installer can be eliminated by heating dryer without changes in the technical characteristics of pipelines.

For water input can be used in UWB pre-insulated pipe with an inner self-supporting layer of cross-linked polyethylene PE-Xa RAUTHERMEX UNO, with an inner diameter of the pipe 25, 32 and 40 mm.

The water non-ducted administered are laid in a trench at a depth of 0.5 m below the freezing depth. At the bottom of the trench must be poured sand layer 0/8 fraction of at least 100 mm thick.

Sergey Bulkin

Accession drainage system under the slab insulated monolithic foundation UWB recommend making sewage pipes soundabsorbing RAUPIANO plus, a diameter of 110, 125, 160 or 200 mm. The required diameter of the pipes is determined in the hydraulic calculation. Pipes laid in trenches beneath the sand cushion. Pipes are joined together and shaped parts via the socket connection. Sheaths with pre-seal should be directed against the flow.

The main stages of construction of a UWB

on the construction of warmed Swedish plates work broken down into a series of sequential steps:

• Mark the place of erection of the foundation and Open the trench to a depth of 300-400 mm, entirely by top soil ground.

• Along the perimeter of the foundation dig a drainage trench.

• At the bottom of the pit and a drainage ditch lay the geotextile layer.

• Pour in layers pit gravel and sand of average grain size, with optional wetting and tamping each layer.

The thickness of one layer of sand at the compacting should not exceed 150 mm.

• Perform installation of embedded pipes under the water inlet, drain and mount the drain.

• Place the prepared substrate, primarily, on the perimeter of the foundation of the future side elements of L-units, manufactured directly on the site of extruded polystyrene foam core and a layer of insulation plates of TECHNONICOL CARBON ECO SP. As additional layers of insulation plates are used XPS TECHNONICOL CARBON ECO SP. For light frame, single-story stone and wood houses are allowed as additional layers of insulation to use extruded polystyrene TECHNONICOL CARBON ECO SP Light.

• Assemble and install the reinforcing cage and a mesh base.

• Lay and fasten the lower reinforcing belt reinforcement cage pipe plumbing wiring and insulate them.
• Place the underfloor pipe and to the reinforcing grid laid fixing pipes or plastic clamps binding wire.

• Install manifold, pour in the coolant system, such as water, and perform a pressure test floor heating system and water supply wiring.

• After successfully conducted hydraulic tests lay in the formwork of extruded polystyrene foam concrete mix.

• Smooth out the concrete mix screed.
• After laying and curing concrete mixture powertrowel trowel concrete surface with the disk.
• After a set of concrete needed strength, perform the washing and thermal test floor heating system.

The outcome of a finished surface UWB foundation.

Advantages and disadvantages of UWB

Constructive warmed Swedish plates directly affects the advantages of this type of foundation:

• For UWB devices are not required to carry out large-scale earthworks. It suffices to remove the fertile soil layer and to prepare the base.
• UWB can organize virtually any type of soil.
• The UWB integrated all the necessary utilities.
• Due flat surface plate before stacking the finishing floor covering is not necessary to arrange the leveling screed.
• Due to the thermal insulation and insulated device blind area and the drainage system, UWB does not freeze under the ground and the foundation is not exposed to forces of frost heaving.
• UWB is being built faster than the classic tape or slab foundation.

Kirill Paramonov

On average, for the manufacture of the foundation area of ​​100 sq. m, leaves 7-10 days. Practice has proved that the manufacture of traditional foundation with the same set of engineering Communications take about 25-30 days, and its final price will be 20-30% higher than the cost of warmed Swedish plates.

UWB - a heat storage foundation. He is well-stores heat and gives it a long time, otaplivaya not ground, and the house, due to the closed insulating envelope without thermal bridges, even when you turn off home heating system will be long keep warm.

In UWB has disadvantages:

• Low plinth. The average height of the UWB does not exceed 0.3-0.4 m.
• The lack of a basement.
• On uneven terrain, a steep slope, you must first level the ground for the foundation. This increases the amount of earthwork.
• T. a. all utilities is hardwired into the plate, and access to them is impossible or significantly impeded, increasing qualification requirements for workers, materials and installation techniques.

conclusions

At the moment, UWB is one of the most technologically advanced and energy-efficient types of foundations. Swedish warmed plate simultaneously serves as a stable base floor and ceiling of the first floor and place gaskets utilities.

UWB can be called an integrated system that provides optimum comfort and significant economy of heat at a country house operation.

On the topic you can read about because of some construction stocks Plate UWB can prosest and how to fix the situation. In the video - about one-story house of the CIP on UWB.

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