Sun Mountain Blog

Radius Muntins

A “muntin” is the narrow rigid strip of wood between adjacent glass panes on a door or window. Muntins can divide individual panes of glass (called True Divided Lite, or TDL), or may be manufactured as a grid overlaying a large single pane of glass (called Simulated Divided Lite, or SDL). Sun Mountain’s muntins are 2” wide (standard), and can be produced with a variety of square or decorative sticking profiles.

Muntin Graphic

Sun Mountain can manufacture radius muntins, creating dramatic glass designs for interior or entry doors, and matching sidelites and transoms. For example, this beautiful entry door features a custom elliptical glass design, with a radius muntin interweaving through straight muntins crossing at the center. The muntin is an SDL grid over clear insulated glass. This 3/0 x 8/0 x 1-3/4” thick door is made of Knotty Alder and is finished in Sun Mountain’s Honey stain. It graces the entrance of a luxury home in Sunset, South Carolina.


The entry door shown below is a 6-lite design, with matching 4-lite sidelites and a three-piece transom with 2-lites each. It features a unique radius lock rail, and arching muntins bending upward through the entire system. This door is made of Knotty Alder and is finished in Sun Mountain’s Poudre River glaze.

Door 1.96




This 4-panel flat arch entry door features a cathedral arch lock rail, with one panel below and three vertical panels above. It has complementary 1-panel, 4-lite sidelites and is made of Select Alder wood, finished in Sun Mountain’s Argentine Peak glaze. The 10-lite flat arch transom, with arched muntins, is the crowning element of this beautiful entrance.


For more information or a free quote, contact Sun Mountain at (888) 786-6861 or visit