This paper presents applied research on stretchers for double-sided canvas paintings based on experimental tests and conservation practice. The mechanical behaviour of canvas and its inner tensile distribution are discussed, and tensioning systems aiming to provide even distribution of force are proposed and put into practice. Turbulence caused by currents of air, which might lead to deformations and consequent mechanical damages, can be mitigated by a mechanism able to absorb and dissipate vibrations using a viscoelastic material. Studies and research carried out to date have led to the practical construction of tensioning structures made from wood, aluminium and other materials from other fields. Applied structures and devices, as well as some prototypes, are described.