Bay and Bow Window Glass Replacement in Calgary
Bay and bow window glass replacement in Calgary starts from the same fact in both cases: the glass fails the way any window's glass fails, and the replacement unit goes into the existing frame, angled or curved. A bay window's panels sit at fixed angles; a bow window's panels curve in a continuous arc. The frame shape is the only real difference between them.
By Saleem Khan, Owner, Great Choice Glass · Updated
The Difference
Bay Windows and Bow Windows, What Is the Difference?
A bay window is built from three or more flat glass panels set at angles to each other: one large centre panel flanked by two angled side panels. A bow window uses four or more panels, each at a shallower angle than a bay window's, so the whole structure reads as a smooth curve rather than a corner. Both styles are built around the same kinds of glass units used in any Calgary home, with a fixed centre section, operable side sections, or a mix of the two.
This page treats them together for that reason: the panes inside an angled or a curved structure fail the same way, and both get replaced the same way.
Why It Happens
Why Bay and Bow Window Glass Fogs, Cracks or Breaks.
Three things bring a bay or bow window's glass in for replacement, and all three are glass-only jobs that leave the frame and casing untouched.
Fogging between the panes means the seal around the insulated glass unit has failed, letting outside air in and trapping moisture that no amount of cleaning removes. A bay or bow window's panels are a frequent place for this to show up first, because several separate sealed units sit side by side in one structure. Calgary's Chinook temperature swings add to the strain: large sealed units expand and contract repeatedly as the temperature shifts, and that cycle wears a seal down faster than a steadier climate does.
Cracks and full breaks come from hail, an impact, or thermal stress across the pane, the same causes documented for window glass generally. Alberta Building Code Section 9.6 requires tempered or laminated safety glass in windows within 500mm of a door frame and windows with a bottom edge within 900mm of the floor, among other designated hazardous locations. A bay or bow window with a low sill or a door nearby falls under this rule, confirmed during the on-site assessment.
How It Works
Replacing the Glass in a Bay or Bow Window.
The individual glass unit comes out of its own section of the frame and a matching replacement goes back in; the casing, roofline and surrounding structure stay as they are. Great Choice Glass measures the opening on site, confirms the existing glass specification, and matches the replacement to it so the window's thermal performance stays the same.
A bow window's curved sections are fabricated to the same angle as the original, since a flat substitute in a curved frame leaves gaps at the edge. Where only one panel in a multi-panel structure has fogged or cracked, only that panel is replaced; the rest of the bay or bow window is left alone unless the assessment finds a reason to do otherwise.
Why Great Choice Glass
Why Calgary Homeowners Call Great Choice Glass for This.
Great Choice Glass has repaired and replaced bay and bow window glass across Calgary for 15+ years, 3,000+ jobs and counting, working on building glass only, no auto glass and no windshields. The same glaziers handle every job, which means a crew that already knows what Calgary's climate does to a sealed unit over time, not a rotating call centre.
Most window companies want to sell a new window system. Where the frame is sound and only the glass has failed, Great Choice Glass does the glass and leaves the rest of the window alone: a smaller job and a smaller bill than a full window replacement for the same damaged pane.
FAQ
Common Questions
Yes. The glass unit comes out of the existing frame and a matching unit goes in; the frame, casing and surrounding structure stay untouched. A full window replacement is only needed where the frame itself, not the glass, has failed.
No. Both use the same kinds of glass units as any other window in a Calgary home. The difference is the frame: a bay window's panels are flat and angled, a bow window's are curved, and a bow window's curved panels need to be fabricated to match that curve.
Sometimes. The requirement applies where the window sits in a location the code treats as hazardous, such as within 500mm of a door frame or with its bottom edge within 900mm of the floor. A bay or bow window with a low sill or a nearby door falls under this rule; Great Choice Glass confirms during the site visit whether it applies.
No. If one panel has fogged and the rest are clear, only that panel is replaced. A bay or bow window with several panels at the same stage of seal life, several fogging in the same season, is a different situation Great Choice Glass will explain honestly during the assessment rather than replace more than is needed.
