ᐅ Double layering of panels horizontally and vertically?

Hi everyone,

I am covering a room that, due to angles, sloping ceilings, and a door opening, has quite a few sections with widths of 90/100/110 cm (35/39/43 inches).
The room height is 240 cm (94 inches).

All the marked walls will be double-layered (it will be a bathroom).

Would you prefer 2 layers installed vertically with 2600 x 600 mm (102 x 24 inches) boards spaced at 30 cm (12 inches) on center,
or 2 layers installed horizontally with 1200 x 600 mm (47 x 24 inches) boards with the usual 60 cm (24 inches) on center spacing?
Or one vertical layer at 60 cm (24 inches) on center, and the second layer horizontal, also at 60 cm (24 inches) on center?

Thanks and best regards

Have you ever considered sheathing with OSB and drywall? This approach nearly eliminates all overlapping joints due to the different dimensions. Additionally, it provides good fastening options everywhere for various fixtures.

Honestly, no. Since it will be a bathroom (a wet room), and OSB is three times as expensive.

For years, I have only been using adhesive to fasten things in the bathroom. Mirrors, towel racks, toilet paper holders, etc. have been stuck to tiles in another bathroom for 7 years without any problems. Therefore, there is no need for OSB.

So my question remains 😀

Is it absolutely necessary to use double drywall layers? You can also use gypsum fiberboards (such as Rigidur, Fermacell), which allows you to meet (or even exceed) all requirements for residential wet rooms without double layering.

They do have some downsides (very heavy and quite difficult to screw in, at least when using metal studs), but overall I think you’ll still be faster with them.

Alternatively, you can use moisture-resistant drywall, but it should be 18 mm (0.7 inches) thick – this is also sufficient for bathrooms.