Decorative SDLs, Grids, and Interior Muntins

Appliques | Base Panels | Corner Posts | Corners | Finials | Gable Pediments | Gutters

Ridge Cresting | Ring and Collars | SDLs, Grids, and Muntins | Trims | Transoms

Decorative grids enhance the look of any glass structure. Grids are available in three standard types: Ogee, Traditional, and Colonial.

Solar Innovations® offers two types of grids: interior muntins and exterior grids combined with interior simulated divided lights (SDL). The interior muntins are placed inside the airspace between two panes of glass. This type of grid can be formed into almost any grid style, including radius designs, such as a Palladian or a radiused arch. Muntins are available in Solar Innovations’® five standard paint colors, unfinished aluminum, and the corrosion resistant anodized finishes: clear and dark bronze. Interior muntins are typically more cost effective and are easier to clean. They are excellent choices for rooms that easily become dirty, such as a greenhouse.

Exterior grids are just as they sound. It is a grid placed on the outside of the window which will be in contact with the elements and also on the interior of the room. This grid style is available in our standard paint finishes, clear or dark bronze anodized, and any custom color your job may require. This type of grid can be applied to monolithic or insulated glass. For insulated glass, the air space between the two panes of glass is occupied by an SDL, which follows the shape of the grids for a seamless integration. This piece is available in black or silver and mimics the look of antique grids where there were individual pieces of glass cut around a frame. There are four different profiles available. Each of the four styles are available in numerous patterns, including any custom design you would like. Leaded grids are also available.

It’s important to note that sliding glass doors can only be enhanced with the low profile grid options to maintain functionality. Grids are typically applied to flat glazing and are not applied to curved eave units or sloped glazing for most applications. Solar Innovations, Inc. also offers a variety of etched glazing options. These specialty glass choices can be incorporated into the transom area of any structure, as well as any other panel, depending on the desired effect. Leaded glass and applied lead options can also be utilized in certain applications for greater design flexibility.

Standard Bay with SDLsFixed Window with GridsOperable Window with Interior Muntin

1. Simulated divided lites (SDLs) use exterior trim and an interior aluminum bar to “simulate” a true division.

2. Exterior grids use exterior trim only to give the appearance of divided lites, but the space between the glass is visible when viewed closely.

3. Interior muntins also provide the look of a divided lite from a distance, and they are the easiest to clean, but the space between the glass and the muntin is visible when viewed closely. Please note: interior muntins are only available in Bronze, Hartford Green, Sandstone, Black, White, and Natural Clay.

Both grid types can be used in any of the wall glass, including: standard bays, fixed and operable windows, doors, folding glass walls and windows, sliding glass doors and windows, and transom bays. SDLs, grids, and interior muntins cannot be applied to curved eave units and sloped glazing. They must be applied to vertical flat glazing.

TraditionalColonialLow Profile
1 1/4″ Grid with SDL7/8″ H x 3/8″ W3/4″ H x 5/32″ W
OgeeTraditionalInterior Muntin
1/2″ H x 3/4″ W3/4″ H x 1/2″ W
Gothic Window GridDouble Gothic Window GridRadius Grid
Traditional GridCross GridEnglish Grid

Please Note: When internal dividers are used in an insulating glass unit, such as grilles, muntin bars, or simulated divided lites, there is the potential that dividers will contact the airspace glass surfaces (surface #2 and #3) of the insulating glass unit.

This can occur under the following conditions: When the insulating glass unit airspace pressure is below the atmospheric pressure (IG unit is concave).

This is caused by: Cold temperature conditions, high barometric pressure conditions, the insulated glass unites or windows are being shipped to an altitude below the insulated glass fabrication altitude, fabrication of insulating glass units where the insulated glass unit airspace thickness tolerance is at a lower limit, buffeting wind conditions, or fabrication of tempered insulting glass units where the tempered glass has a bow in the glass

When the metal dividers contact the airspace glass surfaces, there is the potential for having condensation on the room side (#4 glass surface) immediately behind the metal divider. This is because the insulating glass unit has lost its insulating value where the divider contacts the glass surfaces, causing the indoor glass surface to be colder. Therefore, there is more opportunity to have room side condensation with internal grilles than with standard insulating glass products that do not contain these grilles. 

The information above was provided by Cardinal IG – to read Cardinal’s entire technical bulletin on this matter, please click here.

We will be happy to assist you or answer any questions. Please call 800-618-0669 or e-mail us at

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