I have this old cottage built in 1928 and after stripping the walls (lath & plaster) I found the outside walls are 2 3/4 redwood studs. My plan is to fur them out with plywood, 3/4 strips or whatever so that I am able to insulate and run what I need. Any downside to doing this or better options? Thank you.
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If the existing studs are close to straight and plumb, you might consider installing 3 inch rockwool between the studs (sold as soundproofing), and then a layer of rigid EPS foam board to insulate and vapor barrier, then cover with drywall.
I like your suggestion uncle Mike. The EPS will prevent thermal bridging and all you need is longer drywall screws to put up the sheetrock.
These “studs”are flat to the wall? What’s on the exterior?
Thank you to everyone for their great input. Surprisingly, the studs for the most part are in good repair, some are a little wonky, +/- and will need to be adjusted. From the exterior, there is the extremely poor siding that will be replaced and then 1x4 diagonal planking to the studs. Not sure if there is anything such as tar paper in-between, have not gotten that far.
I like the idea of the EPS on the interior side. Using sheetrock shims underneath might help in removing some of the un-evenness of the walls.
You can also use actual shims (wood or synthetic) between the studs and the EPS. Best if you keep track of where the shims are and put the drywall screws close or through the shims. (you can make a story pole and mark where the drywall screws will be, place the shims and screws to hold the EPS in place so they all de-conflict. different colors if you like. )
Consider adhesive with the screws to hold it all together.