Cracked glass repair.
Old putty pared away. New glass bedded and sprigged.
Scope of works
Cracked glass repair is item 06 of 14.
Included in Restoration. Double-glazing retrofit replaces the glass entirely.
| No. | Scope item | Restoration | Double-glazing retrofit |
|---|---|---|---|
| 01 | Repair rot — wood-hardener treatment and spliced inlays | ||
| 02 | Unblock painted-shut sashes | ||
| 03 | Service pulleys, hinges and locks | ||
| 04 | Replace sash cords | ||
| 05 | Fix loose joints — reinforce window frames | ||
| 06 | Repair cracked glass — this page | ||
| 07 | Draught-proofing | Optional | |
| 08 | Remove single glazing | ||
| 09 | Rebate sashes and frames for VIG glazing | ||
| 10 | Install vacuum-insulated glazing | ||
| 11 | Add weights to counterbalance heavier glazing | ||
| 12 | Prime exposed timber | ||
| 13 | Ironmongery — install new lifts, fasteners, locks and handles on request | ||
| 14 | Remove rubbish on completion |
How we replace a broken pane
Glazing a sash by hand is bench work. The affected sash comes out of the box, the old putty is softened and pared away from the rebate, the glazing sprigs are pulled, and the broken glass is lifted clear. New glass is bedded in the rebate, secured with sprigs, and the perimeter is dressed off and primed ready for paint.
Matching the original where it matters
Period sash glass — cylinder, crown, or early float — has a visible texture and slight distortion that modern flat float doesn't. For listed buildings and conservation areas we can source restoration glass that reads correctly against the surviving panes. Where appearance matters less, modern 3 mm or 4 mm float is the quick and economical option.
Crack repair is included in the Restoration package. It doesn't apply to Double-glazing retrofit — that scope replaces the glass entirely with vacuum-insulated units, so a broken pane is solved on the way through.