We are 15 years developing our ovens and we have minimised cracking. The type of cracking that you see in your oven is common and quite normal. With the extremely high temperatures that can be reached and the intensity of a natural heat source such as fire, your oven goes through a “settling in stage” where some expansion will take place. During this ‘settling in stage’ it is not uncommon for these expansion cracks to appear. These cracks are under no circumstance structural defects and will not affect the performance or durability of the oven. If the crack is not aesthetically pleasing to you then you can use a mortar supplied by us to fix it i.e.: 8mm or more. They will not change the cooking ability as the chambers are extremely thick. To avoid excessive cracking you must follow the curing instructions as per the DIY Made Easy Kits instructions below before proper use to remove any excess moisture from the oven that was trapped during the manufacturing process. If you don’t cure your oven correctly then you will see some cracks appearing initially.
DIY Made Easy Kits:
‘Cure’ the oven (to remove moisture) by first allowing the oven to dry naturally for a few days, and by then lighting a small fire. Keep the fire lit for as long as possible everyday until cured. A cured oven will emit very little smoke, and the black carbon (which will initially appear inside the chambers) will disappear (the inside chambers turning white). During the Amalfi kit manufacturing process, as much air as possible is released from the chambers (unlike other kits!) ensuring a high quality. However, small hairline cracking can appear due to the intense heat of a wood fire – particularly if an oven is not cured properly. This is normal, and no problems generally result; however large cracks may easily be repaired with the mortar supplied.
- 5 bags x 20kg sand
- 1 x 20kg of cement
- 5kg of lime
- 800mls of Bondcrete & 800m of Landco 302 cement accelerator
- OPTIONAL: 1 x 20kg of a crushed granite 2-7ml. This will give a rougher finish
IMPORTANT: For Entertainer Kit add 2 extra bags of sand, and 10kg of cement. 200 ml extra of the bondcrete and accelerator.
- We do not recommend stainless steel fronts on our ovens for a few reasons: Stainless steel can reach burning temperatures while fire is at hottest and one could very easily burn their arm when adding wood to the chambers or simply leaning against the front chamber.
- It is not a good conductor of heat and will not retain the heat for any length of time so therefore not good heat retention or fuel efficiency.
- It will in a very short period of time look terrible as it will stain from the heat and look blackish and cannot be polished up.
- It does not attach to the render very well and tends to break away from it.
As the flue is set OUTSIDE THE CHAMBER and the oven only use very little wood then there is no way that any sparks can get into the flue system.
The oven itself acts as a spark arrester as the wood is set so far back in the chamber that by the time it would travel over the roof of the oven it would have distinguished itself and could not travel back up the flue system.
You may if you wish add some balled up chicken wire and place between the flue and china hat so there is still airflow.