Chimney soakers are weatherproof products designed to sit between a tile and an object that protrudes from the roof, such as a chimney stack. They are installed at the point where the roof meets the protrusion. Soakers are typically made from lead, but newer materials like GRP and polypropylene are also used. They help prevent water from entering the roof space and causing damage by ensuring that water runs down the join of the tiles and soaker, eventually running off into the gutter and away from the roof.