Apply a generous bead of waterproof roof caulk to both edges of every 6 inch wide horizontal end lap seam with a caulking gun.
How to seal a hip roof to a wall.
Use screws to secure the rafter to the sill plate.
Apply caulk to every screw head.
Next i ll remove the hip cap get our z trim cut them to length and install them.
The positioning of your rafters will depend on the pitch of the porch roof.
Ideally i like to start by installing a 3 ft.
Allow the caulk to dry completely.
Here i have a longer length.
The porch roof may match the pitch of your home or have a more shallow roof pitch.
Sheet of housewrap or even better a piece of self adhering roof underlayment to the wall before the first truss or roof rafter is placed against it.
If you decide on a shallow pitch porch roof use 2 by 6 foot rafters.
Housewrap creates the foundation.
In the same way that we use z trim for the installation of end wall flashing and sidewall transition we re going to do the exact same thing here on the hip.