Flat door jamb extensions in pine
Cranco lists flat pine extensions for door and window jamb work. Choose the face width, thickness and length to suit the opening you are finishing.
The catalogue includes both 23/32 in and 3/4 in thicknesses. Measure the piece you need rather than ordering by width alone.
Call about sizes and ordering
Flat extension sizes
| Face width | Thickness | Length |
|---|---|---|
| 1 5/8 in | 23/32 in | 192 in |
| 2 3/8 in | 23/32 in | 192 in |
| 3 1/2 in | 23/32 in | 84 or 96 in |
| 3 1/2 in | 23/32 in | 192 in |
| 4 5/8 in | 23/32 in | 192 in |
| 4 5/8 in | 3/4 in | 192 in |
| 5 1/2 in | 3/4 in | 192 in |
| 7 1/4 in | 3/4 in | 192 in |
| 9 1/4 in | 3/4 in | 192 in |
- Cranco catalogue April 2026 catalogue, printed page 7; confirm the current order with your counter
What is a flat jamb extension?
A flat jamb extension is a flat piece used to extend a jamb toward the finished wall surface. Cranco lists the stock as Extension/Flat casing in its pine jamb section.
Is a door jamb the same as a door frame?
The jamb is a part of the frame along the side of the opening. A complete frame includes other parts; the flat extension stock listed here is supplied as individual lengths.
How do I choose the extension size?
Measure the depth you need to cover, the thickness of the existing jamb or extension, and the length of each piece. For a replacement, bring an offcut or an end-view photograph. Confirm the selected dimensions before ordering cuts.
What is the difference between flat and V-groove extensions?
Flat extensions have the flat profile shown here. Cranco’s V-groove extensions have a shaped edge and their own sizes. Match the profile as well as the width and thickness when replacing an existing piece.
Order the lengths and cuts for your opening
Cranco’s catalogue offers cutting to your desired size. Give the counter the finished cut list and confirm the cutting and pickup arrangements before placing the order.
- Cutting and delivery Discuss your cut list and delivery requirements