We just finished re-surfacing a deck on a house that is over 100+ years old. Water started to pool in the centre of the deck a few months after it was completed. When we re-surfaced the deck we ensured there was a slight grade slope and now that we received the complaint we have gone back to review and the slope has changed. We removed the drywall on the ceiling in the basement to review the deck from below and saw that a number of additional beams had been added diagonally between the trusses to add additional support. We also noticed that the basement door which is located right under the deck was difficult to open and close due to shifting. Is this a common occurance when renovating a heritage home. We have never experienced this before?