I am installing chair rail and I found a wall that has a deep bow in it... surprise! The bow looks like it is in relation to built in cabinets, any suggestions on how to work with this bow, it leaves a 3/8" gap that I have to figure out how to make it look nice.
I am not sure what your reason is for removing the chair rail.
But, yes you could remove it with a pry bar. Be care, only pry where the studs are so you don't punch a hole in the drywall.
A good method is to position a piece of 1/4 plywood or a shim behind bar against the drywall.
If the contractor used a nailer, the nails will probably pull right. To prevent damaging the trin, pull any nails back through the trim using a pair of pliers.
Hope this helps
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