There are many types of chimneys, but the ones that we associate universally with that name are the French chimneys. These chimneys require a complex masonry job that not everyone is able to tackle. Therefore we recommend that you consult a builder before undertaking this type of work if you do not have previous experience.
These chimneys are available in various sizes and formats, we can choose the one that best suits the room in which we are going to locate it.
We can use different materials to build the chimney: stone, slab or refractory brick, block, etc. These chimneys are regularized and their interior shape is not necessarily reflected on the outside, as the finish can hide the masonry behind wooden or plastered partitions.
Prefabricated draft regulators can be used, which are lined with refractory brick. At the top of the shot is a ledge that deflects the descending shots of the chimney.
When the exposed masonry is left, it is saved in finish and this allows to leave the brick wall completely seen. To harmonize, the remaining walls of the room will be revoked or covered, in this way the fireplace takes center stage.
How to make the fireplace:
First of all, we must define the location of the chimney, since its optimal functioning depends on it. It must be placed on a wall from which the heat is dispersed over as large a surface as possible.
If the chimney is located on an interior wall, we can also see the brick on the other side of the wall, creating a rustic decorative effect and also, the heat is better used.
For a French fireplace to function properly, the height of the fireplace opening must not exceed 84cm. It is usual to use prefabricated draft regulators with metallic grooves, which have better draft because they are smoother than those made of brick.
The smoke shelf of the draft regulator should be between 15 and 30cm deep with a smooth and concave surface. The chimney of the chimney should have a size according to the size of the chimney.
To build the chimney, we mark the area where it will be located on the ground and begin to place the bricks, forming the chimney box.
The floor is formed on a layer of refractory mortar, where the bricks or slabs are applied. It is possible to give it any shape you want. The placement of the floor is done from the outside inwards so that the cuts are at the bottom.
When the floor is dry, we lined the interior walls with refractory brick.
The extractor hood will be made with partition brick or tongue and groove. The wall of the hood is inclined at 45º and has a cone shape, up to the height where it connects with the chimney pipe. The hood is left to dry at least one day before applying the coating.