when an old farmhouse was moved in two parts to another location closer to town. I was called in to do trim work and install a new floor in the kitchen also.
I scraped off the lino floor and noticed this tar all over the under lying floor on top of the wooden floor.
I was very frustrated in how to remove this tar. I was told by an old gentleman that was on the site that way way back, tar paper was used over some wooden floors to block out drafts and to insulate the floor better. the tar paper would melt or decompose to an extent and act as glue of course.
Removal is very difficult and I have heard on this site of others using some chemical to disolve this tar paper. You cannot sucessfully scrape it, sand it, or go over it. Breaking it down and removing it like a paint remover is the only way left.