Workshop stove clearances and heat shielding
Clearances from a workshop stove to combustible materials
You should ensure that there is at least 400mm clearance from the stove sides and back to any combustible materials and at least 450mm above the stove.
Combustible materials can be heat shielded to effectively make them non-combustible and this is described further down on this page.
Clearances from a workshop stove to non-combustible materials
You should ensure that there is at least 150mm clearance from the stove sides and back to any non-combustible materials and at least 300mm above the stove. This is to ensure that the heat from the stove can dissipate to the room.
Clearances from single skin flue pipe to non-combustible materials
The outer surface of single skin flue pipe should be at least 3 times it's diameter from combustible materials. So the outside of a 125mm diameter flue pipe should be at least 450mm away from any combustible materials.
Single skin flue pipe should terminate a minimum of 150mm before any combustible ceilings, floors, or roofs, unless you have replaced the combustible material as discussed above, or heat shielded the combustible material as discussed below.
Heat shielding combustible materials.
You can heat shield combustible walls by using 12mm fireboard with a 12mm airgap. The gap is easily achieved by using strips of the fireboard as spacers. You should heat shield at least 150mm beyond each side of the stove. The heat shielding should extend to at least one and a half times the diamater of any single skin flue pipe, so for 125mm flue that would be 188mm to either side.