Need some help from memebers. Had kept my oven covered in tarps all of last year and through the winter, due to surgery on hand was unable to complete. I removed the tarps about a month ago and some of my joints have had the mortar completely washed out. Water must have continuall follwed the joint path to wash it out. Heatstop 50 is not waterproof. Any way, my oven still stands was unsure of how to handle. decided to mix up more mortar and forced it into the open joints from the outside. Obviously in some places it has forced its way all the way through to the inside of the oven. in some places there is still no mortar between bricks. Any issues? Should I go inside and fix these joints? Need any info!
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mortar washed out