Det er i SL-Dækket muligt at udelade letbetonblokke i lokale områder og på den måde opnå massive zoner. Massive zoner kan bruges til følgende løsninger:
Built-in rails for heavy or moving parts
Lead-through of concentrated loads from columns
Lead-through of forces from load-carrying walls
Recesses for prefabricated bath units
In projects with short spans, it is often possible to cast 2 decks as 1 – a solution also refered to as double-long decks. This solution reduces the number of lifts by app. 50% and enable a much faster and cheaper installation.
Double-long decks are made possible by casting a massive zone across the deck, which can transfer the forces of the walls through the decks.
If lightweight walls are used, double-long decks can be used without a massive zone. This is also possible if the decks span over apartment units due to the high sound insulation of the SL-deck.