Wood shims are thin, triangular blocks of wood used as spacers to make minor adjustments to the position of two adjacent objects. In window and door installation, they’re often used to make sure ...

Cedar Carpentry Shims These are what you use to shim a door or window into its rough opening when you install it. Score the excess with a utility knife, then snap off the excess shim material.

Q: I need to install some doors at my house. A friend told me to make the rough opening for the door and frame larger than the actual door frame dimensions. He also told me that I need to use ...

Shims are flat pieces of wood that can be anywhere from 6 to 10 inches long and have a taper. One end of a wood shim is normally about 1/16 inch thick while the other end is about 3/8 inch thick.