Cork/soil behind plaster on 70s villa?

[anders07]

Dug out the sides of the house, which is on a slope, and had about 50 cm of soil up the walls. I discovered that the drainage (Platon) was not correctly done on the sides of the house, so now in connection with building a deck around the house, I have dug up the sides. I discovered that the plaster on the house went deep down below ground level (about 40 cm) and ends all the way down at the base to the slab (slab on grade). In some places, the plaster below ground has cracked and it sounded "hollow" so I started chipping away that part and then found some cork material mixed with soil (decomposed cork?). When I chipped away the plaster that went down below ground, I found this cork material along the entire wall, but above ground, it's lightweight concrete blocks. It seems like they placed this cork material to fill out towards the slab and then plastered all the way down to the foundation outside. Is this something normal from the 70s?

Now the walls will be "open" all the way down to the slab under the new deck (wooden deck), so I have chipped away all the plaster below ground level and removed the cork/soil material that was quite damp...

 

[ANR]

https://mobil.byggahus.se/forum/byg...trl-mellan-puts-och-mur-inne.html#post2471834

Is it the same?

 

[anders07]

This was external and cork, träullit I recognize...
It seems to have also functioned as a mold for the slab because there is concrete that has flowed into the cork at the bottom...

 

[Stefan N]

Upload some pictures....

 

[Fotografen]

Any record that has been used for the mold and then remained due to some mistake or "mistake"?

 

[anders07]

Already dug everything up and dumped it into the old hole from the septic tank, so it's really a non-issue now. On the other hand, it probably looks the same on the opposite side, I guess...

 

[anders07]

Some disc that was used for the form and then remained due to some mistake or "mistake"?

Probably, yes, but strange that they polished it... It seems like the mold was built from these cork boards and then the slab was cast inside and lightweight concrete walls were then stacked on top of the cork boards.
The cork boards are about 5 cm thick.

 

[spinky83]

Old thread but maybe someone will be interested in the future.
I have a house from the late 50s with a slab-on-ground foundation and Siporex walls. The slab was insulated with cork and asphalt to prevent cold during winter.
Attached is a drawing of the house foundation.