Block outs are required for lamps, doors, windows and built-in parts in concrete. If the joint between the block out and the formwork is not sufficiently sealed, water can escape from the concrete into the block out. Consequently this leads to various effects. From discoloration, to silting, bleeding-out effects and up to the total loss of the block out.
Seal your block out joints with MARO ® – Sealing Tape.
Formwork joints result by linking formwork elements. If these gaps are not sealed, water leakage and bleeding effects occur there.