We install the house set using our own team or using a specialised subcontractor. When using skilled subcontractors for the installation, we provide the guarantee for the client.
The foundation must be ready before the house set arrives at the construction site. An accurate foundation is an essential prerequisite for high quality and quick installation.
As a rule, we offer the basic assembly/erection, which means that we erect the house set as a statically stable and weatherproof house – we install the elements and materials based on the constructive solution developed by us according to the architectural drawings. Immediately after the primary assembly/erection has been finished, it is possible to measure the vapour tightness of the building and to start special works (water, sanitation, ventilation, electrical systems).
The time it takes to install the house depends on the size of the house and its constructive solution. For example, the installation time for a 2-storey house with 150 to 160 m² floor area and using roof modules is 3 to 4 workdays. The installation of an equal-sized house that uses roof trusses takes 7 to 8 workdays. Therefore the assembly/erection of a house may take twice as long depending on the constructive solution.
Please see a short animation of the assembling works here.
The foundations are of great importance for the durability and lifetime of a house. The client will order the design and construction of the foundations from a local construction specialist. Different countries have different requirements regarding the construction of foundations and only businesses with the appropriate certificate or permit may perform the construction and related earthworks. To design and build the foundations, the site geology (the composition of the ground) and the depth of the foundations in the ground have to be known beforehand. If the building has a cellar, the horizontal loads exerted by the surrounding ground on the foundations have to be calculated.
Our designer will provide the loads arising from the weight of the building, snow and wind loads as well as the building’s dimensions for the foundations.
The use of factory-produced elements in the construction necessitates accuracy and that the elements, as well as the foundations, meet design specifications. Small deviations in the dimensions of the foundations, especially vertically, influence the position of elements and the accuracy of installation. Before the building elements can be installed, the installation team requires to check that the foundations correspond to the drawings and production tolerances. The house may not be installed if the dimensions of the foundations exceed the tolerance limits set out in the drawings and standards.
Specialised businesses will perform special works. Special works may be performed by companies that have the appropriate certificate, previous work experience and qualified personnel.
A wooden frame element house does not set any limitations to the choice of heating system. Practically all heating methods and equipment can be used. The choice of a heating system depends on the client’s preferences. The choice of heating system must be made before starting the constructive design process for the element house. For example, when using under-floor water heating in wooden inserted ceilings, it must be taken into account during the design phase, to avoid making mistakes with the thickness of the finished floor. This is also the reason why we fix the thicknesses of the layers of inserted ceilings in the contract documents.
A wooden frame element house can accommodate very different ventilation systems, from simple vents in the envelope structure to heat accumulation and release systems. Generally, the ventilation system is designed together with the heating system and often they form a unified heating and ventilation system. Both systems can be installed in the building after the basic assembly has been finished.
We do not install water supply and sanitation piping into the elements at the factory because pipe junctions, elbows, joints and other pipe connections have to be made at the site and must be easily accessible in order to guarantee that the connections are performed correctly. Based on the water supply and sanitation project our task is to provide that the structure has the necessary openings for the installation of pipes. Such a division of work helps to assure that the responsibilities for the works performed are clearly defined. The business performing the special works will get a work area from the installation team where they can plan their work and pressure-test the piping before the structure will be closed.
At the factory, we will install flexible casings for electrical cables inside the wall elements based on the electrical design project provided by the client. At points in the wall where electrical switches and wall sockets will be placed, we will install junction boxes. After the elements have been installed, it is possible to start the installation of electrical cables into the flexible casings pre-installed at the factory.
Interior finishing works may be started after the special works inside the structures have been finished and the structures have been closed. Interior finishing works are not related to the structure of the house and they start several weeks after the installation works have been completed. Before starting the interior finishing works it must be made sure that the temperature and humidity in the rooms meet the relevant standards. For this reason, it is a good idea to begin extracting excessive humidity from the building as soon as its structure has been sealed. Although the biggest source of humidity is the reinforced concrete of the slab foundation, large amounts of water will also be introduced during the interior finishing works due to the use of mainly water-based finishing plasters and paints.
The house will be erected under the supervision of the client or their representative.
The installation team has to keep a construction log where they make daily entries regarding the works that have been performed. When all works have been completed, an instrument of delivery and receipt will be prepared where incomplete works will be listed if any deficiencies are found. In case of significant deficiencies, the client will not sign the instrument of delivery and receipt; instead, a deadline for remedying these deficiencies will be agreed upon.
The entire process will be documented and is traceable. A construction supervisor hired by the client also has the obligation to record important stages during the construction and to immediately inform the installation team of any deficiencies found. In the case of more serious problems, we (the contract partner) have to be informed.