What is the lap?
the lap is there so you screw up the roofing and it all fits on the roof evenly, also if you do lap it den it will prevent the houze from getting wet inside
Why do we use supporting paper?
we use supporting paper so when it rains, it goes down either the roof or through the paper to the front of the house. we also set out the suporting paper over lapping each other this means when it rains it will be going down rather then going insde the house.
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