I have a 100+ year old house and it has shipboard lapping on the inside of the walls. I have no insulation in the walls and want to get some in. My walls have sheetrock, then the shipboard then the studs and then the wooden siding.
I've thought of three ways to get insullation in in them but don't know which is the best.
1) blow in fiber insulation between the studs, but I don't really like this idea because the insulation compacts over time.
2) remove the wooden siding and blow in foam insullation and then replace the wood siding.
3) remove the sheetrock and shipboard lapping and put in rolled insullation, vapor barrier and then put up new sheetrock. I am leaning towards this as I can do this myself, but I don't know if it is good to leave off the shipboard lapping.

Which is the best way to do the insullation and what are some of the opinions on these processes.