I am wood framing concrete garage door opening described with pictures in this question.
Top concrete header is about 2" inches out of level across 9' opening length. I want to install 2x8 PT header under it and make it level. So I will have 2" gap on one side. What is the best way to do it? I am thinking of just cutting short piece of this 2x8 and using it as a shim in the right place in the gap. Will it work? Does it make any sense to fill the rest of the void with something like cement patch?