I have plans to put up drywall on the interior ceiling where there is currently some type of wood paneling. It almost looks like scrap pieces in some places. I don't have access to the house yet.

What do you think, is it safe to put drywall directly on this or should I search for the studs?
(built in the 70s)
Cracked white wooden ceiling with pink curtain and floral wallpaper, illustrating a 1970s interior renovation consideration.
 
A board ceiling attached to the rafters is a very good base to fasten into. It might become a little odd, so a seam may end up in the middle of a joint, but it doesn't matter—just use more screws and more plaster. Place the new screws about 30 cm apart to ensure stability. The width of the boards is 120 cm, resulting in 4 rows of screws, and it's also suitable to place the boards across the grain of the wood in the ceiling.
 
In the 60s-70s, it was common to have a ceiling made of raw lumber of a rather coarse quality, which was then covered with a type of stretch plastic, similar to the paper-stretched ceilings of older times. It is likely that one of these was cut down and then the raw lumber was painted.

If it is flat enough, you can screw directly into the raw lumber. Otherwise, you can screw a spaced panel into the raw lumber and the plasterboard into the panel. This way, it is easier to correct any potential errors.
 
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