Single-family house in Stara Wieś built from precast walls

That is why erection is planned around the crane's reach before the first unit leaves the plant. It is set at a point from which it can reach every final position at the necessary capacity — which falls as the boom extends — and the units are loaded onto the trailer in reverse order of erection. The whole day is then a series of lifts from one station.

Walls delivered whole at the full length of the elevation cut the number of those lifts further: fewer units means fewer crane cycles, fewer joints to make and a shorter erection day.

Hence too the low-loader rather than an ordinary trailer. A wall at the full length of an elevation is a load that goes beyond a standard bed — and the lower it sits on the trailer, the lower the overall height of the vehicle and the simpler the journey. Transport stops being the cost of bringing material to site and becomes part of the technology: it decides how large a unit can be made in the first place.

We also supplied a precast concrete stair flight, set during erection of the structure.

The walls were made in lightweight concrete — concrete in which the natural aggregate is replaced by expanded clay, that is fired clay with a porous structure. The air trapped in the granules reduces the weight of the unit and its thermal conductivity, while the loadbearing capacity remains: we produce lightweight concrete in classes from LC12/13 to LC20/22.

Scope of work: lightweight concrete external and internal loadbearing walls at the full length of the elevation, stair flight, transport and erection.