Causes and treatment of flue water leakage

The flue is a straight and transparent hollow square column in the corner of the kitchen from the ground floor to the top floor. There is a round hole near the top of each floor for connecting the smoke exhaust pipe of the range hood. On the top floor, the flue is higher than the roof, and there is a cover plate at the top to prevent rainwater from leaking. Flue plays an important role in the kitchen, which can not only discharge oil smoke to improve the indoor environment, but also play a role in fire prevention. How can this flue leak?

The roof flue is not waterproof.

The joint between the flue root and the roof is called an additional layer, and the additional layer of the roof needs to be waterproof. If it is not waterproof, rainwater will penetrate into the flue, causing water leakage. The practice is: cut an annular groove along the root of the flue, clean up the base surface, and then plug it with a plug king. Then the root of the flue is painted with 300mm thick uncured waterproof coating, and then a layer of SBS waterproof coiled material is pasted on the coating.

The floor of the kitchen upstairs leaks and seeps down the outer wall of the flue.

The joint of the flue upstairs is not waterproof, and the kitchen floor leaks and seeps down the outer wall of the flue. Turn off the main water supply valve upstairs, and the kitchen will not use water for 2 days. If the downstairs is still leaking, it can basically be ruled out that it is upstairs that causes the flue to leak. If there is no leakage downstairs, it can be considered as upstairs. The treatment method is to cut an annular groove around the root of the flue upstairs, clean the groove, block the annular groove with plugging agent, and compact and polish it with a press. The root of flue shall be coated with 300mm thick polymer waterproof mortar or coated with flexible waterproof layer.

Do you have a full understanding of flue leakage?