Concrete masonry unit

In construction, is referred to as greenstone or insulated concrete forms an artificial rock that contains one or more vertical air chambers inside that are open at the top and bottom. The patch from such stone wall is subsequently filled with concrete.

Scarf stones are usually made ​​of normal concrete or lightweight concrete. There are also circuit blocks, which are made ​​of insulating materials such as polystyrene. So these are only the form, not the substance of "stones". Such Isolierschalsteine ​​be used, for example to build swimming pool. With the lightweight formwork blocks of polystyrene foam but can also be achieved very good insulation values ​​, which buildings can even reach passive house standard.

Typical heights are 17.5 cm, 20 cm to 25 cm, the usual widths of 10 cm, 15 cm, 20 cm, 24 cm, 25 cm, 30 cm, 40 cm, 17.5 cm in Germany 20 cm, 24 cm, 30 cm, 36.5 cm, 42.5 cm, 49 cm. Per square meter of wall area approx 67-278 liters of concrete will be needed depending on the width.

Use

Scarf stones as a system of lost formwork be dry laid (not mortared ) often for the execution of stable basement walls used. This avoids the elaborate design of formwork, which is normally required for concreting, as well as the obstruct the very heavy foundation stones.

Another area of ​​application is earthquake-prone areas where the reached by mortar between actual stone composite seems insufficient. Gladly therefore terraces and embankments are backed up.

In the Philippines scarf stones, the usual construction.