I am replacing 50 year old T&G cedar siding on soffits that curve up as an architectural detail on my home. The structure is 1/4" ply over 4x beams, wooden arcs and 2x4 cross braces. The original cladding (~72" spans) was nailed each end to beams and middle just thru the 1/4" ply. Each plank had a bead of adhesive (from 1970) Not much, but some.
My dilemma: I am replacing the 1/4" plywood so that is new but it is my understanding that T&G should not be glued.
Any suggestions for best attaching new T&G cedar to this structure or anything else I should be aware of? After 50 years, most damage appears to have happened from a built-in gutter trough and roof problems above. Those have been repaired. There is not much bite to 1/4" ply. The cedar will be sealed all 6 sides. Please see pics. Thank you.