But it doesn t work that way.
Sidewall flashing shingle roof.
The flashing needs to be installed before installing the roof shingles the metal flashing is formed with a hook edge and cleated on 12 centers the flashing extends up the wall at least 4 the flashing extends onto the roof a minimum of 2 inches 4 inches is preferable in more severe climate areas.
Once even a small section of roofing cement fails you ll have a leak.
Apply drip edge and roof underlayment over the roof deck and continue lapping up the sidewall and over the water resistive barrier in this case rigid foam insulation a minimum of 7 inches figure 2.
Sidewall flashing sidewall flashing is applied when the side of the roof butts up against an adjacent wall.
The wall side of the flashing can either be covered over with siding or sealed with caulk.
Waterproof your windows with liquid flashing learn how to install liquid applied flashing to seal the rough opening while leaving a path for water to escape.
Butyl tape should be applied where the foot of the flashing attaches to the roof.
Epdm flashing tape with a butyl adhesive backing will help.
Each additional rain adds more water and before you know it you ve got rotted wood.
Vent flashing done right to prevent leaks back up roof vent boots with flashing counterflashing and proper shingling.
