In the period immediately following the Second World War, Tassullo became a joint stock company, thanks to growing demand for building products and post-war reconstruction. The company expanded its activity, building new furnaces to bake the Natural Hydraulic Lime and acquiring new quarries. 

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The 1970s also saw the acquisition of the Società Anauniense Miniera San Romedio, which originally mined black schist, a particular form of sedimentary rock that is rich in aquatic fossil deposits and is a source of ichthyol, a substance with considerable antiseptic properties. The rising popularity of penicillin and other pharmaceutical products had caused a fall in the demand for ichthyol, and the mine was therefore converted to allow extraction of Scaglia Rossa Trentina, a highly desirable marl with a characteristic perfect balance of clay and limestone. The first industrial premixing plant for the production of plaster and mortar for the building sector was also constructed in the 1970s.

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At the beginning of the 2000s, the company invested in a research project that confirmed the geological uniqueness of the old San Romedio Mine site, which lay above hundreds of hectares of the purest Dolomite rock. This marked the beginning of the deep excavation of this uncontaminated rock that, mixed as an inert substance with Natural Hydraulic Lime, characterises the high-performance range of Tassullo products.

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Since 2013, in line with its brand values, the company has played a lead role in a unique project for the regeneration of spaces; Dolomite rock extraction is in fact programmed in light of circular economy, and the spaces created from mining are transformed into highly sustainable storage areas.

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The period of economic crisis hit the Tassullo group heavily and had a profound influence on the story of the company.