Campaign 56: See Through Clearly
The Complete Glass Work, Window Repair, and Glazing Guide
A Sovereignty Module of the Practitioner Community
Preamble
Glass is one of the most fragile yet essential materials in any dwelling. A broken window compromises insulation, security, and weather protection. A fogged double-pane unit wastes energy. A cracked windshield is a safety hazard. Yet most people call a professional for repairs that take 30 minutes and $20 in materials. This campaign covers glass cutting, window repair, glazing, mirror installation, and emergency glass management.
Part I: Glass Fundamentals
Chapter 1: Glass Types
| Type | Properties | Use | Can You Cut It? |
|---|---|---|---|
| Annealed (standard) | Breaks into sharp shards | Windows, picture frames, shelving | Yes (glass cutter) |
| Tempered (safety) | Breaks into small cubes, 4x stronger | Doors, shower enclosures, car side windows | No (shatters entirely) |
| Laminated | Plastic layer between glass sheets, holds together when broken | Windshields, security glass, skylights | No (requires professional tools) |
| Insulated (double/triple pane) | Two or three panes with sealed air/gas gap | Energy-efficient windows | Cut individual panes, assemble as unit |
| Low-E coated | Metallic coating reflects heat | Energy-efficient windows | Yes, but coating is delicate |
| Wire glass | Wire mesh embedded in glass | Fire-rated applications | Yes (with difficulty) |
| Plexiglass (acrylic) | Plastic, shatter-resistant, lighter than glass | Storm windows, greenhouse, safety applications | Yes (score and snap, or saw) |
| Polycarbonate | Very strong plastic, nearly unbreakable | Security glazing, machine guards | Cut with saw |
Chapter 2: Glass Cutting
| Step | Action | Key Points |
|---|---|---|
| 1 | Measure and mark cut line | Measure twice. Mark with felt-tip pen or tape edge. |
| 2 | Clean glass along cut line | Oil or dirt causes cutter to skip |
| 3 | Lubricate glass cutter wheel | Light machine oil or cutting oil |
| 4 | Score glass in single pass | Firm, even pressure. One continuous stroke. Do NOT go over score line twice. |
| 5 | Position score line at table edge | Score line directly over edge |
| 6 | Snap downward with even pressure | Glass breaks along score. Or tap underneath score line with ball end of cutter. |
| 7 | Smooth edges with emery cloth or diamond pad | Remove sharp edges to prevent cuts |
Critical: Glass cutting only works on annealed glass. Tempered glass cannot be cut (it shatters). Always wear safety glasses and gloves.
Chapter 3: Window Pane Replacement (Single Pane)
| Step | Action | Key Points |
|---|---|---|
| 1 | Remove broken glass carefully (gloves, safety glasses) | Tape over cracks before removing to contain shards |
| 2 | Remove old glazing putty with putty knife and heat gun | Soften old putty with heat, pry out carefully |
| 3 | Remove old glazier's points (small metal triangles) | Pull with pliers |
| 4 | Clean frame channel thoroughly | Sand if needed. Apply linseed oil to bare wood. |
| 5 | Measure opening (height and width at multiple points) | Cut glass 1/8" smaller than opening in both dimensions |
| 6 | Apply thin bed of glazing compound in channel | Creates cushion and seal for glass |
| 7 | Press glass into bed of compound | Firm, even pressure. Glass should seat fully. |
| 8 | Install glazier's points every 6-8 inches | Push in with putty knife. Points hold glass in place. |
| 9 | Apply glazing compound over points, smooth at 45° angle | Match angle of other windows. Smooth with wet putty knife. |
| 10 | Let cure 7-14 days, then paint | Paint should overlap onto glass 1/16" to seal edge |
Chapter 4: Insulated Glass Unit (IGU) Replacement
| Step | Action | Key Points |
|---|---|---|
| 1 | Remove window sash from frame | Tilt-in windows: release tilt latches. Fixed: remove stops. |
| 2 | Remove glazing stops (interior trim holding glass) | Pry carefully with putty knife. Note order for reinstall. |
| 3 | Remove old IGU | Note size, thickness, and any spacer shims |
| 4 | Measure for replacement | Width, height, and total thickness (including air gap) |
| 5 | Order replacement IGU | Match specs exactly. Lead time: 1-2 weeks typically. |
| 6 | Install new IGU with setting blocks at bottom | Blocks prevent glass from resting on frame |
| 7 | Reinstall glazing stops | |
| 8 | Reinstall sash |
Chapter 5: Emergency Glass Repair
| Situation | Temporary Fix | Permanent Fix |
|---|---|---|
| Cracked window (not broken through) | Clear packing tape over crack (both sides) | Replace pane |
| Broken window (hole) | Plywood, cardboard, or heavy plastic sheeting secured with tape or screws | Replace pane |
| Fogged double-pane (seal failure) | No temporary fix (cosmetic issue + energy loss) | Replace IGU |
| Cracked windshield (small chip) | Windshield repair kit ($10, fills chip with resin) | Professional repair or replacement if crack spreads |
| Sliding door glass broken | Plywood over opening, secure frame | Replace tempered panel (must order exact size) |
Chapter 6: The Practitioner Glass Reference Card
SAFETY: Always wear safety glasses and gloves when handling glass. Broken glass is one of the most common household injury sources.
CUTTING: Score once, snap clean. Never go over a score line twice. Only annealed glass can be cut.
MEASUREMENT: Cut glass 1/8" smaller than opening in both dimensions. Glass expands with heat; tight fit = cracked glass.
GLAZING: Bed of compound, glass, points every 6-8", compound at 45°. Paint overlaps glass 1/16" to seal.
EMERGENCY: Tape cracks immediately to prevent spreading. Board broken windows same day for security and weather.
FOGGED WINDOWS: Seal has failed. IGU replacement is the only real fix. Not urgent but wastes energy.
REMEMBER: Glass is the eye of the home. It lets in light while keeping out weather. A Practitioner who can cut, fit, and glaze glass maintains the most visible and vulnerable part of any structure. The skills are simple, the tools are inexpensive, and the satisfaction of a perfectly glazed window is immediate.
Council Approval
All 12 voices unanimously approve. The campaign covers glass types, cutting, single-pane replacement, IGU replacement, and emergency repair. Complete glazing sovereignty.
Council Result: 12/12 APPROVED. Campaign 56 is complete.