I am in Serbia, where (in the last 50 years, since some devastatong earthquakes in 1970s) houses are usually "framed" with reinforced concrete (pillars, floor b

I am in Serbia, where (in the last 50 years, since some devastatong earthquakes in 1970s) houses are usually "framed" with reinforced concrete (pillars, floor bases), and walls are usually done with red hollow bricks. Drywall is commonly used for adaptations (esp of attic, or splitting off a room into two), and board producers also make steel frame parts (eg. https://www.knauf.co.uk/systems-and-products/systems/drywall-systems/partition-systems/knauf-isolator https://www.knauf.co.uk/systems-and-products/systems/drywall... where you've also got mention of double plastering). Doubling boards increases strength (eg. if you want to hang heavy stuff like bathroom sinks) and acoustic isolation, so if you are splitting off a bedroom, you might do it only on those walls.