In earlier years, it was normal to heat building sites during the winter - in some periods the heating technology to be used was almost completely financed by legislator within the framework of the so-called winter building subsidies, and the oil price was negligently low. During the last twenty years, the situation has changed fundamentally. Heating building sites in winter has become a visible cost factor, and thus the cost-benefit aspect has to be asked today. This again leads to the question which technology shall be employed best of all.
The subject of heating building sites in winter is mainly of importance during the shell construction phase, thus as long as the permanently installed heating system, based on warm water as a rule, is not functional yet. Nowadays, the building industry active in the shell construction phase usually buys in heating in winter whereby the costs of the subcontractor as a rule consist of logistics - thus, set up, move, remove - the hiring costs of the unit, and from case to case the energy costs. Typically the energy costs to be paid by the building contractor in case of oil make most of the overall invoice in the meantime. For this reason, it depends mostly on the cost of energy as well as the efficiency of the technology employed. Thus, it depends on the relationship between the energy consumed and the energy which is available for heating the building object. For this purpose, HEYLO offers oil heaters which scores with its high efficiency and low energy consumption. But in the electric field as well, HEYLO has the complete choice between 2 and 30 kW. The electrical heaters are very robust and are intended for highest demands.
Thus, what good does a construction site heating do in winter? On the one hand the construction site heating ensures construction progress. When the construction progress stagnates during longer cold periods, the costs thus resulting could make a multiple of the costs of the construction site heating. These costs are borne by the construction company, and as they were not included in the tender cannot be passed on to the building owner.
Without the construction site heating, the building owner has to bear costs which are even higher than those already mentioned. We are talking about increased heating costs at least during the first two years after completion of the building, right up to costs of potential mould remediation when mould develops after completion due to moisture. The physical contexts can be summarised as follows: During the shell construction phase, considerable volumes of water are passed into the building, such as by screed and fineries.
On a living space of 120 sqm, there is about 1,500 litres of superfluous water or up to 200 litres per sqm of building material, depending on the type of building material, at the end of the building time. Moist masonry has lower insulation values than dry masonry. For this reason, it has to be heated more during the cold season until the masonry has dried to equilibrium level. Depending on the situation during the first two years after completion, the heating costs can reach more than double of the usual value due to a lack of construction site heating and ventilation. In modern buildings which have been equipped with low-temperature heating systems in conformity with the latest legislation in Germany, it may happen that the building never reaches the necessary degree of dryness, and a mould infestation develops - with corresponding health and costs consequences.
Well, it can be said that the problems described here are not relevant for the building industry as they concern the building owner only in the end, however from today’s point of view such as arguments can hardly be supported. A construction site heating in connection with technical drying, if necessary, may save the building owner at lot of trouble and costs in the further course after completion of the building