If you have ever had the opportunity to draw windows in a proposed building, you might have come across the problem of what thickness to give to Divided Lites and Mullion, and how to draw the detailed section for each. It is a detail that would only be obvious if you are directly involved in the manufacturing of windows and doors, but it can have a significant impact on the cost of a project. The TDL, SDL and Mullion have a rich, shared history – understanding this history can help make wiser design decisions. It is important when matching a historical style in hertitage buildings, and it is important when trying to achieve a specific look. Knowing the difference can assist in drawing windows more accurately, which will result in more accurate quotes.

Unison Windows & Doors Infographic: TDL vs SDL vs Mullion Download Link

For more information, please contact Jim Eisenhauer – [email protected] or Louise Lu – [email protected], or call us at 604-980-6000