What is the white substance on the outside of my chimney?
This is known as efflorescence. It is the product of an un-lined chimney or a clay lined chimney with cracks and or missing mortar joints between the tiles allowing acidic condensation and moisture to bleed through the masonry structure causing it to turn white. A TOP-Flex liner will create a sealed system containing the acidic condensate and preventing this from happening in the future! One solution to remove the white stains from your chimney is with Brick & Mortar Cleaner.
