Back to back plastered chimney system is suitable for timber frame and steel frame. This design
allows both chimneys to be built without breaking into the party wall. The two chimneys remain
independent of each other until they reach the top of the party wall. Then using a reinforced
steelite lintel they join together to become one, externally above the roof level. A cavity tray is
recommmended but not automatically supplied in the kit. This is an extra.