4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles.
How to lnstall one peice roof flashing.
Proper installation of step flashing.
Most flashing is 8 inches wide.
Install shingles as normal up to the base of the plumbing vent.
Install from the bottom up lapping each piece on top of the lower one.
But it doesn t work that way.
Installing a roof plumbing vent is typically an easier task than flashing a chimney.
Then sink two nails in the wall near the top one on each face.
You continue this process around the length of the chimney cutting each step flashing to fit.
Install 6 in wide strips of a self sticking waterproof underlayment.
Bend it down and back to sit flat on the corner.
Momentarily lift the boot and apply sealant to hold the flashing in place.
Step 6 make a 10 degree bend on the shingle edge of the flashing approximately 1 2 inch from the edge.
Step flashings are to be installed one per course.
Place the flashing or boot onto the plumbing vent so the base is resting on shingles.
Make corner flashing from step flashing.
Continuous flashing against a sidewall is one way to install a roof but it s not the correct way.
Here is how you do it.
If you have to replace shingles around a skylight examine the old flashing.
Protect the eave from ice dams and sideways rain step one in steep slope roofing is the edge flashing.
The top piece that bends around the chimney is left unattached.
It may seem as if a single piece of flashing would offer more protection than many pieces of step flashing.
The roof deck flange of step flashings are to be fastened to the surface of each shingle in a position whereby the next course of shingles will cover up hide the flashing from view.
One common method is to lay the edge metal under the eaves membrane and over the rake.
Once even a small section of roofing cement fails you ll have a leak.
This underlayment will direct any water that may get through the metal flashing onto the roofing felt.
