Good Afternoon all, after having a kitchen wall removed and an RSJ inserted(see Pic 1) my sons bedroom floor is very bouncy and cracks are apparent around the skirting(pic 2) where the RSJ and the corner of the bedroom floor meet. My immediate thoughts are that once inserted there is a gap between the floor beams and the RSJ, not being an expert by any means can anyone shed any light on my problems. All comments appreciated.