Professional rendering/plastering of polystyrene formwork blocks
Depending on the surface's unevenness, polystyrene formworks blocks can be rendered/plastered after filling either with a normal reinforcing mortar or a special lightweight render. Both coated and uncoated formwork blocks are suitable for this purpose. Observe the prevailing guidelines and approvals of the stone manufacturers.
Simple & safe to the goal
1. Clean the polystyrene formwork blocks thoroughly. Fill joints up to max. 1 cm with foam prior to rendering/plastering works. In case of unevenness > 7 mm, it is recommended to use the lightweight underlay reinforcing mortar weber.therm 376; in other cases, use the bonding and reinforcing mortar weber.therm 300.