Arthur 51 wrote:
Hi all.
I quite fancy douglas fir for my bookshel/cabinet project.
SL Hardwoods have 290mm x 19mm x 3m (finished sizes)
My question is, is 19mm adequate thickness for the verticals which
will be 2.8m high?

Thanks.

Arthur
Yes. Its stiffness you need to worry about with loaded 'slender columns'
but shelves and a back will brace that well enough.