Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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?

share|improve this question
up vote 2 down vote accepted

The new lumber door header will not be structural. Go ahead and frame the door rough opening plumb and level with your lumber and spacers. Use shims to snug it up to the concrete. Get creative with your trim to conceal the imperfections.

share|improve this answer
I should have mentioned, be sure to secure the new rough opening door frame to the existing concrete opening. This may involve using some Tapcons or Ramset nails to firmly secure the jacks and studs to the wall. Even if it requires securing some spacer blocks etc., the frame wants to be rigid all around. – shirlock homes Mar 27 '12 at 11:41

Is the header structural? If so, then you'd likely want go scribe your header's top to match the uneven concrete and then cut it to match.

If it's not structural, then just set it level, and take care of the gap with your casement/trim.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.