Home Improvement Questions? Ask a Handyman for Answers
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Installing new flashing is the correct way but it can be slipped under the bottom siding course. You don't need to remove the siding. All that may need to be done is to cut the nails on the bottom siding course assuming you have clapboards or similar siding.
Yes you would need to remove some siding. I was under the impression you already had something in place and just wanted to make it wider.
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