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The effective width of cross-laminated timber rib panels is analysed. The floor system consists of cross-laminated timber plates rigidly bonded to glued-laminated timber ribs by means of screw-press gluing. Ultimate-load tests were performed on four different cross-sections. Digital image correlation was used to visualize and monitor the strain distribution on top of the cross-laminated timber plates at midspan. The longitudinal strain distributions along the cross-laminated timber width were obtained for the determination of the effective width. The experimental results are compared to numerical results of a finite element model and to Eurocode 5 estimations. The longitudinal strain distributions show good agreement and confirm digital image correlation as a suitable measurement technique.