Can anyone tell me if these shingles have been installed incorrectly? It seems that water coming down off the high slope could potentially run underneath the shingles on the lower slope? Shouldn’t the shingles have been installed with the higher slope overlapping the lower? How much could this potentially cost to remedy? Seems like it could get expensive if a lot of the shingles have to be ripped off and re-done the right way.
Thank you for any advice.