We need a structure for the inner walls and outer walls as well. Instead of making 2 structures (or choosing a thick brick wall) that insulates nothing our approach is different.

Tego / plywood tightened with screws to our metal columns. Check it out on the drawing below. If no thick heavy walls that means no thick heavy foundations needed.

This is a plan with the boxes at the shorter parts. The red lines are the strong tego / plywood for a semi structure to hold the lightweight façade. And the red small rectangles are the columns.

The blue represents wood. That helps to fix the façade. It’s way cheaper this way than buying 90* metal corners. This way cost maybe 1/5.

On the image down we have the interior, bathroom. Up we have the exterior. Within the box we have the insulation and the false facade. Within the same box, under the false facade we have the electrical equipment. I show a simplified version.

It depends on the materials chosen as finishes on the facade. We used wood so it can be fixed directly with screws. We can use triangles instead of rectangular sections. The wooden triangles help us fix our facade to the tego / plywood.

Choosing a triangular section (instead of a rectangular one) means we need maybe half of the wood. At the exteriors : where the forces are small I would go with this triangular version.

Highly recommend reading this:

Chimney effect. Check out the link above. The layers complicate a bit. We use the chimney effect. The heat from the Sun won’t get to the insulation. Moving air between the facade and insulation will let the hot air escape.

Rectangular chicken wire … or any other wire mesh system could hold the insulation in place. It won’t “fall” on the “chimney effect”. Fences in general are great for the task. Note that we need additional membranes. The house needs to breathe, evaporate from the inside. Meanwhile the membranes shouldn’t let water droplets and dust towards the interior.

Basically we have a double facade. Air can pass between them freely. The upper part is open … and the lower part is open as well. It will work as a chimney. The warmer the facade gets … faster the hot air will leave the house.

The house won’t radiate back heat in the evenings. None of thermal mass in the walls. None of sleepless nights and air conditioning. In case we really want to preserve energy for night time …we can pour a thick layer of concrete / rock mix as a floor.

Right on the metal beams. (above insulation). So We’ll have an extremely well-insulated passive house with an insanely huge thermal battery.

In summer time the shaders can come down. Nothing will overheat.