A split jamb door frame is an architrave-free door jamb system that wraps the plasterboard to create a flush finish with the wall face. It eliminates traditional architraves and conceals all fixings. INVI Concept manufactures the INVI Jamb® — a world-renowned flush finish door jamb system available across four profiles to suit different door configurations.
Both the INVI Jamb® EZC and SRC are flush, architrave-free door jamb systems that wrap the plasterboard for a clean finish. The EZC is a two-piece adjustable split jamb suited to projects with varying wall thicknesses. The SRC is a one-piece jamb made custom to your wall thickness, rebated on one side to allow the door to sit flush with the hinge side of the wall.
What Is a Split Jamb Door Frame and Why Do Architects Prefer It?
Architects, interior designers, and developers specify split jamb frames to achieve contemporary flush-finished spaces. Key reasons include:
- Flush finish. No architraves means no visual interruption to the wall surface.
- Concealed fixings. The frame wraps the plasterboard to hide all fixings.
- Paint-ready. All INVI Jamb® profiles can be painted immediately after installation.
- Fire rated. Fire rating is available on select profiles — speak with the INVI Concept technical team to confirm parameters.
Section summary: A split jamb wraps the plasterboard to deliver a flush, architrave-free finish — the preferred choice for contemporary residential and commercial interiors.
Which INVI Jamb® Profile Is Right for Your Project?
INVI Jamb® Classic Adjust – EZC
A two-piece split jamb adjustable to various wall thicknesses, ensuring a smooth finish along the wall face. Available in standard, full height, or custom heights and widths. Fire rated option available.
INVI Jamb® Single Rebate – SRC
A one-piece frameless door jamb made custom to your wall thickness. Rebated on one side to allow the door to be installed flush with the hinge side of the wall. Available in full height or custom heights and widths. Fire rated option available.
Allows the door to swing open into the corresponding room while installed flush in line with the wall face, hiding the appearance of doors along the wall. Available in full height or custom heights and widths.
INVI Jamb® Double Rebate – DRC
Allows for two doors with fire rated concealed hinges to be hung in a fire-rated flush door jamb. Designed for interconnecting hotel rooms. Available in custom heights and widths.
Section summary: Four profiles — EZC, SRC, ISD, and DRC — to suit single doors, inswing applications, and double-door hotel configurations.