To put the planks up horizontally, I would find all of the wall studs and mark them ( maybe with a chalk line). Then, using a 2 1/2" finish nailer, nail the cedar over the sheet rock directly into the studs. I think this would allow for better expansion and contraction. Glue may fail over the years due to fluctuating humidity levels, plus glue would be very time consuming. If you're applying the planks vertically, I would use 1/2" matarial running horizontally nailed to each stud for the length of the wall. Put up at least three courses (top, middle and bottom), then nail the vertical cedar planks to the 1/2" material.
If they are glued to the wall board, plan on replacing it. It will likely come off with the cedar.
You cut it to size and air nail it in the tongue of each piece.
If the face of your tongue and groove is smooth then you don't need drywall. I have one whole room covered in T&G cedar and it looks great.
It wouldn't be recommended. It would be better to cut away the plaster or drywall in the area of the tongue and groove install and put in horizontal framing members to which the tongue and groove can be nailed.
how to water proof tongue and groove
The woodworking form "tongue and groove" (also tongue-in-groove) connects separate strips of wood, such as flooring, by having a milled extruding projection or ridge (tongue) on one side, that perfectly matches and fits into a milled concave recessed slot (groove) along the side of the adjacent board.
no! no!
A tongue and groove specialist.
wood work
yes you can, as long as its treated timber. tongue-in-groove can be used on floors, ceilings, walls or fences. anywhere really.
Laminate flooring comes in a few different forms. One can get planks, tiles or squares and it mimics the look of wood, tile or stone. Each side has either a tongue or groove for easy installation.
You will bust off the TOP half of the grooved side. ( because there is nothing under it to support it while driving in the nail. Once the nail begins to hit the bottom edge it wont break because its supported and resting against the floor) Dont nail the Tongue side with nothing under the tongue either because you'll bust off the tongue too. Always connect tongue and groove together so its a solid piece of wood before nailing, or fill in the gap so either end (tongue or groove) is supported from the floor up to where you're nailing.
"Floorboards" are tongue and grooved wooden planks that are used to make wooden floors.