Aluminium soakers are uses when forming a pitched roof against an existing wall. These aluminium soakers are pre-fabricated to a 90 degree angle, and are inserted between successive courses to make a waterproof joint. Aluminium soakers are a lightweight and durable alternative to lead and are supplied in a packs of 25. Properties Length: 12" (300mm). Width: 6" (150mm). Bent: 4" x 2" (100mm x 50mm). Thickness: 0.5mm.