Window Framing

[djwestly]

Wasn't sure where to post this since I didn't see a window section.
Looks like prior owner replaced a window but didn't put wood back (trim and ???).


It looks like this all the way around the window.
I bought trim to put on the wall but what goes on the inside of the frame?
I assume just flat pieces of wood?
What is this called and what kind of wood do I use/buy?

Thanks,
Dave

[handyandy]

They are called shims I think. Is that what you mean? You put shims in the spaces and then seal it. Then you can trim it out. Hope that helps, let us know what questions you have!