Hi,
I am building a 12×16 workshop building on a very tight budget.  It is 2×4 framed with 3/4 plywood sheathing.  I plan to wrap with Tyvek then install board and batten siding with deck screws.  I have been offered enough rough sawn poplar to do the job, at a very good price, but it is 1-1/4″ thick.  Is that too thick (heavy) for  the usual 2 screws in the middle of each board to hold it in place?  Thanks for your help.
-Ron