I recently moved into a single story double masonry house and discovered a rather noticeable amount of cold air coming from around the dishwasher in the kitchen. I pulled out the machine and found that to run the drain pipe for the sink they had removed several of the interior layer of bricks.
I'm wondering what the best approach would be to insulate or seal around the pipes to cut down on the cold air coming in. I was thinking a spray foam insulation may be the best bet due to all the crevices, but wasn't sure if it expanding could cause issues with the pipes. Is that the route I should go or is there a better option?