Installing L Flashing On Roof

Use roofing nails to install the l shaped flashing flush with the roof and wall then cover it with roofing cement and reattach the roofer s felt. The top piece that bends around the chimney is left unattached. This how to video explores proper roof flashing installation for shingle roofing applications.

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Use the metal break tool to bend the flashing lengthwise in the middle according to the angle of the roof joint.

Installing l flashing on roof.

If you purchase the flashing flat you will have to mold each piece yourself. Completing a professional grade step flashing installation is important. Bend the corner flashing tightly around the corner. Under the base part of the flashing use plastic roofing cement and finish attaching it to the roof with galvanized roofing nails.

Then nail the new l shaped flashing under the builder s felt but above the fascia board. If you do not wish to form your own corner flashing you can buy pre bent pieces and cut them to size or use a piece of corrugated aluminum which is easier to bend. Step flashing is installed where the roof and the side wall meet to defend against water penetration. Flashing is installed to surround roof features such as vents.

Step flashing on roof peak. Roof shingle over step flashing. Step flashing can be purchase pre molded into the l shape or flat. Most flashing is 8 inches wide.

Step 6 make a 10 degree bend on the shingle edge of the flashing approximately 1 2 inch from the edge. 4 inches should go up the house wall and 4 inches should go on top of the porch roof shingles. You continue this process around the length of the chimney cutting each step flashing to fit. Begin by removing the shingles at the affected area and removing old flashing if present.