I have an 86 yr old Brick Chicago Bungalow. The brick on the gangway wall is turning to white powder and the brick is crumbling. We had a new sidewalk poured 18 months ago and is now leaning in towards the home. The brick has even turned to white powder in the basement also. Is this damage something to that needs immediatly attention, what is it and who can be called to inspect what is happening? Thank You in advance.