Isolated galaxies are the ideal reference sample to study the galaxystructure minimising potential environmental effects. We selected a completesample of 14 nearby, late-type, highly inclined ($i\geq80^{\circ}$), isolatedgalaxies from the Catalogue of Isolated Galaxies (CIG) which offers a verticalview of their disc structure. We aim to study extraplanar Diffuse Ionized Gas(eDIG) by comparing the old and young disc components traced by near-infrared(NIR) and Ultraviolet (UV) imaging with the H$\alpha$ emission structure. Weobtained H$\alpha$ monochromatic maps from the Fabry-Perot (FP) interferometry,while the old and young discs structures are obtained from the photometricanalysis of the 2MASS K$_{s}$-band, and GALEX NUV and FUV images, therebyidentifying the stellar disc and whether the eDIG is present. The H$\alpha$morphology is peculiar in CIG 71, CIG 183, CIG 593 showing clear asymmetries.In general, geometric parameters (isophotal position angle, peak lightdistribution, inclination) measured from H$\alpha$, UV and NIR show minimaldifferences (e.g. $\Delta i\leq\pm$10$^{\circ}$), suggesting that interactiondoes not play a significant role in shaping the morphology, as expected inisolated galaxies. From H$\alpha$ maps, the eDIG was detected vertically in 11out of 14 galaxies. Although the fraction of eDIG is high, the comparisonbetween our sample and a generic sample of inclined spirals suggests that thephenomenon is uncorrelated to the galaxy environment. As suggested by theextraplanar UV emission found in 13 out of 14 galaxies the star formationextends well beyond the disc defined by the H$\alpha$ map.