About us We have chosen to structure our business around IsoTec Invest and 4 Subsidiaries: ISOLIS - ISOLEA - ISODEAL - ALGERIE IsoTec. We have made ​​this choice to give you a clearer picture of our areas of expertise. Based on our experience of over 30 years, our Subsidiaries will answer your every problem. All our Subsidiaries, through their different qualifications, also ensure the optimum quality, safety at construction sites, preservation of the environment and contribute to the common policy of sustainable development which drives the group.