Oakum is a rope made of flax fibers drenched in pine tar (or Stockholm tar) and makes for a terrific caulking method to seal joints or fill gaps in timber. These fibers are driven into the wedge-shaped seam between planks or in large holes. The caulking is then covered over with a putty
. Originally this was used in the shipping industry to fill crack between timber boards. Our Oakum can be easily torn into smaller pieces to suit your application.