The most safe and versatile installation method is with the OSB strips. See how on this link.

If you plan to mount bathroom fittings, a washbasin, faucet, wall-mounted toilet or other bathroom furniture on the panel, you need to install, for example, a 0.5-inch thick sheet of plywood behind it. You can, of course, attach the decor to studs behind the wall. 

Fibo Seal is specially developed for our panels and is ETAG 022 approved. Fibo Seal is also supplied in the same colors as the joints on the panels. Do not use silicone, only MS polymer sealant approved according to SINTEF TG 2289.