Thimble vents in wood siding
Has anyone ever heard of thimble vents for wood siding? I am going to blow in cellulose insulation in the walls of a 100 year old house with wood siding. A contractor said I need to have thimble vents in my wood siding to help remove water vapors otherwise he said the paint failure I have experienced would be greater than it is now. I have looked on the internet & have yet to find thimble vents for wood siding. My questions is has anyone ever heard of these, do they work & where would I get them?