External Concrete Window | Sill Repair

: If rebar is exposed, scrub it clean and apply a zinc-rich primer to prevent further corrosion. Phase II: Application

: Often caused by thermal expansion or minor settling. external concrete window sill repair

If moisture reaches the internal steel reinforcement (rebar), it rusts and expands, causing "spalling" where large chunks of concrete fall away. : If rebar is exposed, scrub it clean

Concrete doesn't bond well to dry, dusty surfaces. : If rebar is exposed

: High-strength concrete repair mortar, bonding agent (acrylic or SBR), and exterior-grade masonry sealant.