Envelope Phase Charts for Retrofit Projects

Retrofit projects often show high interior progress while the envelope lags, which looks contradictory on a single cumulative curve. We split envelope tracking into measurable installation units.

Count panels, not floors

Curtain-wall progress tracks installed panel count vs total bill of quantities. Floor level completion misleads when partial façades stay open for hoist access.

Weather days as non-work entries

Korean monsoon weeks may show zero envelope progress without implying contractor default. We add weather annotations from the site diary so owners distinguish force majeure from crew availability.

Tie interior float to envelope gates

When lease dates depend on weathertight status, mark the envelope milestone as a gate on the combined chart. Interior progress beyond the gate appears greyed until the façade reaches the agreed threshold.

Retrofit owners in Anyang and Bundang typically order envelope-only variance charts mid-project rather than waiting for a full monthly ledger—especially when landlord disputes arise.