Just wanted to say THANK YOU to all who responded. It is nice to know that I am not the only one who has spent far too much time thinking about this. My original plan was a steel frame (with new concrete foundation) and to deal with the other issues this creates as best as possible. Will...
Here's the situation: Existing (3) story 15' wide rowhouse / brownstone (middle of the block), double wythe brick masonry rear wall. New addition to be added to the rear which will require large openings be installed in the rear masonry.
My concern is lateral design requirements. Per the IRC...
