Cyclic tests on two-leaf rubble stone masonry spandrels strengthened with CRM coating on one or both sides

•Experimental tests on full-scale, rubble masonry spandrels.•Effectiveness of Composite Reinforced Mortar applied on one or both the wall faces.•The resistance was 2.8 and 3.4 times that of the plain samples, for one and both sides application.•The ultimate drift was more than five times larger than the reference.•The cumulative dissipated energy was more than 30 times.