Is there a really tough rigid solid insulating material I can put along my half-foundation wall downstairs?

Question

the upper half is drywall, insulated, the lower half is brrrrr concrete, it already is thicker than the upper half which has all the wiring in it, so I don't want to fir it out and redo but more like put an insulator directly on the concrete and maybe texturize it and paint it

ist that possible? thanks

Answer 1

And almost all foam board insulations are flamable and thus have to be covered for fire protection and damage.
And I will warn you that insulation board covered just with paint will heat up the surface much faster, spreading a fire, as we discovered in a fire in my parents home where a flat panel ceiling we thought was plaster turned out to be cellotex and the painted surface exploded in flame when the heat built up.

Answer 2

True insulation has air pockets in it. This will mean it won't be "tough". You could use styrofoam sheet insulation and then use contractors glue to attach paneling to it. The glue could also be used to attach the styrofoam to the wall.