Add to ORKGIn this paper one way of improving resistance of wooden floors with composite action between existing wooden beams and a new reinforced concrete slab is presented. When restoring attic spaces and rebuilding buildings with wooden floors, composite floors with existing wooden beams and a new concrete slab has a great advantage compared to other solutions based on the following arguments: a cost of the composite wood/concrete floor structure is for two to four times less compared to other floors, fabrication is fast and easy fabrication can take place in any climate condition, because it is not necessary to remove the roof, during the fabrication the space which is bellow the floor structure which is being restored can be normally used because...