Building description

In this description you can learn step-by-step how to make your own Roquetinho. All you need is some basic do-it-yourself skills, and for the metal work (someone with) welding skills. Material costs will be between 400 and 500 euro.

Roquetinho outline


    Roquetinho is…

The visible part of the stove (the casing or bell) is made of concrete tiles, such as those often sold for garden paving (60 x 40 x 5 cm). Also second-hand ones can be used. The top two layers are made of refractory concrete. The top is an 6 mm thick steel plate.

The bell absorbs the heat produced and gradually releases it into the room.


On the inside you'll find the rocket burner (the core) in which the combustion takes place. The core consists of a firebox made of hard refractory bricks, and a riser: a vertical channel made of refractory insulating bricks. In this riser, two whirlpools of fire (double vortex) are created, in which the wood gases are afterburned at very high temperatures.


    Archive

In the archive you can find older versions of the Roquetinho.


And here’s the SketchUp files for the 2023 model, the one this description is about. The folder contains the file of the stove, as well as seperate 3D files for the core, the secondary air duct and the frame & door unit.



Step 1  Preliminary considerations, tools, materials


Before getting started with the stove it’s important to check a few things: the supporting floor needs to be strong enough for the 530 kg stove, the chimney should be okay, and volume and insulation of the space to be heated should be in such a way the Roquetinho can do the job. Read more...



Step 2  Casting and cutting concrete. Working with refractory concrete


It's practical to use plastic coated chipboards as a bottom for the moulds, since they are already waterproof and don't need to be painted. Saw the laths that form the mould and fix them on the bottom with screws (not with glue). Paint the laths (2 layers). When the paint has dried, fill the inside brims with a bit of acrylic sealant.

Read more...



Step 3  Base layer, bottom slab, firebox and riser


From the opening in the ceiling through which the flue goes, draw a plumb line to the floor. At 42 cm to the left and 18 cm to the right of that point, draw a line. The first two 40 x 60 cm concrete tiles will be placed between these two lines. Read more...



Step 4  First layer of the bell. Placing the core


The top of the first layer of the bell should be exactly level with the firebox. In the SketchUp drawing, that first layer is 356 mm (including the glue). The firebox is 353 mm with 3 mm underneath for the strips of clay on which it will be placed. Read more…



Step 5  Construction of the bell


From the second layer, the corners are not only glued, but also additionally secured with a screw. For this, holes with a diameter of 6 mm are drilled on the longer parts, 25 mm from the side. Read more…


Step 6  Metalwork: floorchannel, frame and door unit, top plate


The dimensions of the floorchannel and the frame and door unit assume a core with outside dimensions of 220 x 353 x 570 mm. If these dimensions differ you need to adapt the figures. Read more...



Step 7  Assembly


You fix the frame with cob. Working with cob is really different from working with cement. Try it out first; the cob shouldn't be too dry or too wet. When applying, ensure you make an uninterrupted "roll"; there should be no gaps in it. Read more…