Heritage preservation uses channels for non-invasive reinforcement:
Austria:
EN 10279 UPN80 channels discretely reinforce 18th-century timber frames in Vienna, adding 30% lateral strength without altering facades.
Czech Republic:
Hot-rolled channels (S235JR) strengthen stone archways in Prague's Old Town, with 8mm web thickness fitting within 100mm mortar joints.
Slovenia:
Galvanized channels (ISO 1461) protect wooden trusses in Ljubljana's medieval churches from moisture, extending lifespan by 50 years.