To maintain heat inside the oven once it has been fired, a low thermal conductive material is required. Insulation material also ensures that the outside of the oven is not hot injuring the users. Rockwool (mineral wool) and Ceramic fiber blanket are the main choices in Kenya, though fiberglass blanket is also used.
Ceramic fiber blanket is used to cover the dome to ensure that no heat escapes from the oven. Additionally, it is very useful in insulating the chimney so that heat from the pizza oven is not lost through the chimney.
Rockwool is also used as an insulating material of the oven. It can be used instead of ceramic fiber both in chimney insulation and covering of the oven as it is also poor in thermal conductivity.