Beaded overlap rabbet on exterior shutters

What is Overlap Rabbeting?

shutters with overlap rabbet
shutters with overlap rabbet

Overlap rabbeting on exterior shutters is a groove along the vertical edge that allows one shutter to overlap the shutter next to it.  An overlap rabbet is very much the same as what is termed as a shiplap joint or half lap joint.

exterior shutters closed with an overlap rabbet
exterior shutters closed with an overlap rabbet


Overlap rabbeting can be found on all functional exterior shutters and for a very good reason. With an overlap rabbet the shutters will close over one another eliminating any exposure in the center leaking rain, light or air . The overlap rabbet also creates a solidness to a closed pair of shutters locking them tighter together to eliminate any “shuddering” for better storm protection.


Is Overlap Rabbeting just for Exterior Shutters?

plantation shutters with overlap rabbet
plantation shutters with overlap rabbet


An overlap rabbet is just as important for interior shutters.  With an overlap rabbet UV rays are blocked from damaging your room furnishings as well as providing a tighter seal over the window giving better energy efficiency.  If you are using your interior shutters as blackout shutters for a bedroom or a media room overlap rabbeting is a must.

overlap rabbet on shutters
overlap rabbet on shutters

Overlap rabbeting is decorative, as well as functional, giving a neater and more finished appearance.  If you look at the picture to the right you will see the half-round bead detail.  This is shaped into the wood shutters to give a more uniform look to the face of the shutters.  This type of rabbet is referred to as a beaded overlap rabbet.

When should I use shutters with overlap rabbeting?

A good rule of thumb, for both interior and exterior shutters, is to have an overlap rabbet if your shutters are meant to be functional or at least look functional.  It is an option that adds very little to the cost but greatly increases their value.

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Kestrel Shutters & Doors, Inc.   www.DIYShutters.com   1-800-494-4321 / sales@diyshutters.com