The flashing should extend over the shingles at least three inches.
Flashing where different roofs meet.
Step flashing is best for where the roof face meets a wall for example where a dormer projects out of the roof.
Now nail this first flashing at both its far ends.
Different types of materials cater to the different needs of homeowners.
In this spot it s possible that water could flow down the wall and slip past the shingles into the building below.
There is another place that roof flashing has now invaded.
Today the flashing is on top of the siding.
It is at the back of the porch roof where the roof meets the house siding.
489 78 kb my business partner and i recently added a large screened in porch with a gable roof onto a client s home.
Place the 2 by 4 inch piece of lumber along the center of the flashing.
Gently bend the flashing using the edge of the lumber.
Joining two roofs of different pitches.
Some roofs stop at a vertical wall.
Slide the right edge of the flashing under the highest roof pitch.
Materials for roof flashing.
The porch joined the house at right angles to a shed roof section.
Install valley battens on both ends of the roof valley then attach first flashing 3 4 inches over the roof flange and another 3 4 inches over the fascia if any is present.
Roof flashing on a porch roof.
While installing flashing is not the most exciting part of roofing it is one of the critical components that a roof cannot do without.
Remember to caulk the underside of the flashing with a sealant.
Step flashing ensures that water is directed away from the wall and ends up in the gutter.
Roof material changes direction.
Valleys are those areas of the roof where two sections of roof meet at a joint and form an angled dip.
Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies.
It runs all the way down to the drip edge which it should overlap slightly.
This flashing may be behind wood siding or in front of a brick wall.
By john carroll download the pdf version of this article.
The gibraltar building products l flashing protects your home the gibraltar building products l flashing protects your home from moisture infiltration where your wall meets your roof.
L shaped flashing is a versatile general use flashing used where a uniform or strengthened finish is needed on a 90 surface.
Traditionally the flashing was installed and hidden under the siding.
Valleys are the number one area where shingles will erode and roof leaks will happen if valley flashing is not installed in them.
At joints and penetration points.
Step 6 install the flashing.