FIELD: building, particularly joisting for building concrete floor of 15-40 mm thickness or other building structures, namely flat roofs.
SUBSTANCE: joisting includes at least two shaped bars each having longitudinal bearing member. Two perforated side walls are connected to bearing member. Perforated bases extend from perforated side walls in opposite directions. Free ends of bases are bent downwards and located symmetrically one to another so that oblique angle is formed in-between.
EFFECT: enhanced engagement between beam system and covering material.
15 cl, 18 dwg
