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Over the last decade, industrialized mid-rise light-frame timber buildings have gained popularity in Chile due to their structural, manufacturing, and environmental advantages. However, structural design aspects and industrialization prescriptions are not thoroughly addressed by national design codes, highlighting the need for developing standards to regulate industrialized earthquake-resistant timber systems. Therefore, this paper presents the outcomes of a large national project aimed at characterizing the lateral performance of a series of full-scale industrialized timber diaphragms employing Chilean materials. Eight 3.6x2.4 m specimens were tested under in-plane lateral load, considering different detailings such as sheathing, nailing, and framing. Besides, bare slabs (no sheathing) were also studied in the campaign. Strength results proved to be consistent with those proposed by international regulations, while chord tensions exceeded 30% of those obtained by principles of engineering mechanics. Additionally, it was found that adding gypsum boards over plywood does not considerably improve the global stiffness, although it considerably increased the in-plane strength. Finally, a finite-element numerical model was developed for the slabs studied in this campaign, proving to be capable of capturing the nonlinear behavior of the specimens under large lateral displacements.