Separate construction from the visual pattern
Grilles between the glass sit inside the sealed glazing assembly, leaving the accessible glass surfaces smooth. Removable interior grilles attach on the room side and can be removed according to the maker’s instructions. Permanent applied bars remain on the glass during routine cleaning.
Simulated and full divided-light names vary by manufacturer. Some packages combine interior and exterior bars with a spacer between the panes; others omit that spacer or use a removable interior grille. Ask for a section drawing or sample so the label is not doing all the explaining. True divided lights use separate glazed sections rather than merely a pattern over one sheet.
Draw the pattern on the actual opening
A colonial grid divides the view into repeated rectangular lights. Prairie-inspired patterns often keep a larger central area clear with bars nearer the edges. Neither pattern automatically suits every house of a certain age. Compare existing proportions, original photographs where available, and nearby openings on the same elevation.
Mark the grille layout over a photo using the proposed visible glass dimensions. Check that horizontal bars line up where intended across adjoining units. A pattern that looks balanced on a tall showroom sample can become crowded on a short basement window. Review the view from inside as well as from the street.
Specify maintenance and future options
Confirm bar width, profile, finish on each face and whether interior bars are removable. Ask how the chosen grille package affects the exact model’s published ratings. Built-in between-glass grilles are not removable accessories; changing them later may mean changing the glazing unit.
For partial replacement, keep a written grille schedule by opening and verify colour samples alongside the existing windows. If heritage controls apply, resolve the acceptable pattern and construction before ordering. Cleaning access, replacement-part availability and a clear drawing are more useful than an unsupported claim that one style is always cheapest or most authentic.
Technical references
- Andersen: Window and door grille styles — Manufacturer distinguishes grille constructions and removable options.
- Andersen: Replacement grille options — Between-glass and permanent grilles differ from replaceable interior accessories.
- NRCan: Window and door ratings and certification — Compare the rated configuration rather than assuming all grille packages are identical.
Include a preferred date and time
Discuss your exterior project
Select the exterior work and note the current material and repair or replacement needs.
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