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How To Install Chimney Flashing Kit8/31/2023 The purpose of the front lead apron is to make the joint between the chimney and finished roof water tight. This is because gravity obviously takes water downwards, so the top part of any joint should overlap the section underneath, as with roof tiles themselves. If you are installing lead flashings to a chimney you always need to start at the lowest point of the visible chimney above the finished roof. Water penetration due to the action of surface tension with water.Water penetration due to the action of wind.Water penetration due to the action of gravity.There are three main factors you must take into consideration when installing lead flashings. Click here to find out more about lead flashing in general. The purpose of lead chimney flashing is to form a water proof bridge between the sides, front and back of the chimney and the roof structure and is normally constructed out of lead. To view part 2 click here: Lead tray DPC.
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