The Prelement technology
The light weight concrete wall structures we distribute unite the advantages of the traditional small element and the precast big element technologies. These advantages are due to the special basic material as well as the production and installation characteristics.
The frame of the light weight concrete is provided by expanded clay beads (ceramsite) that are burned out at 1200 °C, the external clinker shell appearing on the granules and the porous inner truss result in a solid and light weight structure.
Characteristics of the aggregate ceramsite light weight concrete
- Heat absorber – The solid walls store heat well ensuring an excellent feeling of comfort both in winter and summer time
- Good thermal insulation – By means of 20 cm insulation an outstanding, 0,15÷0,19 W/m2K thermal transmittance can be reached in the headwalls
- Vapour permeable – Thanks to the high ceramic content the walls transmit vapour, this way letting the building “breath”.
- Fireproof – The fire classification of the ceramsite aggregate light weight concrete is “A1 – Non-combustible” (DIN 4102 standard)
- Durable – It is resistant to water, frost, acids and lyes, its lifecycle may exceed as many as 100 years
- Solid – In terms of solidity, the light weight headwalls are classified as LC16/18 and the division walls as LC12/13
- Sound proof – The sound insulation of the 15 cm thick wall panels of 1600kg/m3 density is 45 decibel
- Healthy – The wall structure contains exclusively natural materials, it is resistant to mould and other pests.
- Eco-friendly – The technology produces approximately zero construction waste, the wall material is 100 % reusable.
1. Wall panel technology Comparing different types of wall structures
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Prelement wall panels
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Hollow bricks
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Lightweight wall structure
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Minimum wall thickness
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15 cm (up to 4 levels)
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30 cm (up to 4 levels)
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15 cm (up to 2 levels)
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Typical division wall thickness
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12 cm
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10+2 cm
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10 cm
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Compression strength of load-bearing walls
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16 N/mm2
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11 N/mm2
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C24 structural wood: parallel to grainline 21 N/mm2 – perpendicular to grainline 2,5 N/mm2. The compression strength of complete wall depends on the support structure.
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Compression strength of division walls
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12 N/mm2
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5 N/mm2
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C24 structural wood: parallel to grainline 21 N/mm2 – perpendicular to grainline 2,5 N/mm2. The compression strength of complete wall depends on the support structure.
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Prelement wall panels
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Hollow bricks
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Lightweight wall structure
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Wall layer structure
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Prelement wall panel (15cm) + Austrotherm EPS AT-H80 (20cm) thermal insultaion. Total wall thickness: 35cm
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Plaster (1.5cm), Porotherm K PROFI hollow brick (30cm), Dryfix mortar, Austrotherm EPS AT-H80 (10cm) thermal insulation. Total wall thickness: 45cm
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Gypsium board 1.25cm, 15cm wooden structure C24, 1.5cm OSB, Austrotherm EPS AT-H80 (10cm) thermal insulation. Total wall thickness: approx. 30cm
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Thermal transmittance (U)*
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0,146 W/m2 K (passzív ház)
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0,156 W/m2 K
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0,151 W/m2 K
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Energy efficiency classification*
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AA
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AA
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AA
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Sound insulation of load-bearing walls*
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45 dB
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42 dB
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0 dB
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Sound insulation of division walls*
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41 dB
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40 dB
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0 dB
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* Source: csaladihaztervezes.hu, Thomas Praefa
Installation technology
The biggest advantage of the big element building method is quick installation. While a family house made of bricks needs to be put together with 4-8000 blocks, only 15-35 elements of wall panels need to be placed in the right position.
In order for the ready wall structures to reach excellent quality after installation, our colleagues carrying out the installation work do the following activities of key importance:
- Land surveying – The accessibility of the work area and the geometric suitability of the foundation are checked
- Appointing the places of the walls – The position of the walls are marked up on the foundation and the height levels are set with the help of a rotating laser and szintezőkékek
- Post installed rebars – put into the basement where necessary on site, according to the shop drawings of the walls
- Lifting of walls – by mobile cranes, in a predetermined order, positioned by plan. Levelling mortar is applied under the walls.
- Positioning – the vertical level of the walls are set using a bubble level, then the panels are fixed by temporary diagonal formwork support.
- Wall joints – at the meeting points of the wall panels vertical straight rebars are built into the outfolded reinforcement bar loops, after which the joints are closed by formwork and filled up with C20/25 class concrete mortar.
- Welded connections – in case of single storey buildings welded steel plates are installed at the top of the wall panels
- Documentation – in the course of the construction work there are single photos taken of all the steps of key importance (post installed rebars, wall joints, welding), the complete documentation includes 50-100 photos, depending on the size of the building.
Project phases
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Ask us!
Send us an email for more information on lightweight concrete wall panel technology. Do not hesitate to contact us for further advice or price calculation related to your current building project.
