Battens needed or not? Reclaimed fir table top
Hi, finishing up glue up on a 40x80 table top made from reclaimed, 100+ yr old douglas fir. Thickness will 1 and 1/2"
This will go on a trestle style table base, still being built, which will have 3 supports for the top. On the ends, about 14" off each end, and another in the middle. I could also do 4: spaced roughly 15" apart, I suppose. Top will be mounted with counter top style fasteners.
Question is, does a top this size and species need battens to help keep it flat? Not doing bread board ends. If so, how many and where?
Any advice appreciated. I've just never done a top this large, nor of OG fir and not sure how much potential to move/cup it will have.