I have plastered brick walls, painted with stain-resistant paint.
The paint is reasonably durable.
Due to climactic conditions (humidity very high, tropical heat, no air con), wood needs extra attention paid to it. I have solid wood doors throughout my house, with several layers of oil-based varnish, which are fine, but, say, dresser drawers made from untreated wood are musty-smelling, and essentially they smell of must and mould.
So for my kitchen wall cabinets, which are 1m tall, I could I think:
- use nailer strips directly onto the wall with no back
- use nailer strips with a 6mm plywood back
- use nailer strips with a 4mm melamine one-sided sheet
- use a full 15mm or 18mm solid back (there's not much difference in price between 15mm and 18mm)
I am applying white-coloured HPL (similar to Formica) to most of my plywood, e.g. doors, etc.
A thick back is quite nice, but if I am to laminate both sides (for stability) then the cost becomes quite high, especially given that the cabinet is 1 metre tall.
On the other hand I could just varnish either a thick plywood back, or even a thin one, and the cost of varnish is much less than laminate.
Or I could just take advantage of my quite strong and stable plastered, painted walls.
Is there a particular best practice given that most of the other panels can be seen to be usefully two-sided (hence laminating both sides is a reasonable thing to do, financially), but the back has at most one visible side.