How many people know what Irish Flax Felt is?
Commonly known as Irish, it is a product that was actually made in Belfast, Ireland. It is composed of flax felt that is asphalt or bitumen saturated. Because of the way it is made and its flexibility, it is a great product for tie in between old and new roofs and around drains. It has been used for shower pans and to waterproof around protrusions in a roof that might be the attachment point for a sign (or a drain, masonry wall, deck flashing, etc). We sell it to the marine industry where it is known as “ship’s felt”.
It is a product that is very mold-able and hard to tear, thus the different uses. I am sure there are other uses.
We currently call the product Flax Sheathing Felt. I can remember years ago when the rolls would come in wood crates and would actually be square from shipping. We currently import the rolls in a container and then box ten rolls to a shipping container. By doing it this way, the rolls are round and easy to unroll, cut with a Dexter or hook knife and apply.
Being an asphalt product, Flax loves hot asphalt. Just cut it to the shape you want and then hot mop it in.
If you have an unusual application where flexibility is important, try a little Flax Sheathing Felt. Who knows…