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I am about to attach some trim over some old trim to cover up a particularly ugly doorframe/wall joint. I think before I do this, it may be a good idea to fill it, since otherwise there will be a large-ish space behind my trim. What would be the best filler to use in this case? The gap is too wide for caulk in some cases, I think, but I am not sure what to use instead.

Here are some photos:

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If it is less than an inch, caulk will fill it fine before you cover it with trim.

Use a caulk that has high flex characteristics like a polyurethane based caulk, actually latex with silicone would work too.

Don't need to be too careful, trim will cover up the caulk.

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