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The roof have in the burning chamber have two functions.
1.
Give the smoke a longer way through the boiler, that give a better cooling of the smoke
and will result in a higher boiler efficiency.
2.
The heat from the roof will reflect down into the fuel, and helping drying out wet fuel
By changing the length of the roof, it is possibly to regulate the temperature in the burning chamber.
Depending on the used fuel, the side in the burning chamber will covered or not covered with chamot
stone.
13.4.1 Guideline for chamotstone in the burning chamber.
Fuel:
Water content:
Roof
Side stone
Wood chip 30-50%
100%
100% with extra insulation behind
Wood chip 20-40%
100%
100%
Wood chip 15-25%
100%
0% or only in the front
Pellets
6-15%
100%
0%
Straw
10-25%
50%
0%
13.4.2 Chamotstone Maintenance:
On the yearly service on the boiler, all stone have to be checked, and changed if needed.
When replacing the roof, or a part of it the space between the stone have to be sealed with suitable mortar,
the same mortar can be used to fix the sidestone if they are being replaced.
If a stone have a simple crack there is no reason to change it, so long as the steel plate are covered.