489 78 kb my business partner and i recently added a large screened in porch with a gable roof onto a client s home.
Flashing where different roofs meet.
Materials for roof flashing.
Today the flashing is on top of the siding.
Some roofs stop at a vertical wall.
Remember to caulk the underside of the flashing with a sealant.
In this spot it s possible that water could flow down the wall and slip past the shingles into the building below.
Step 6 install the flashing.
Roof flashing on a porch roof.
Traditionally the flashing was installed and hidden under the siding.
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.
Valleys are the number one area where shingles will erode and roof leaks will happen if valley flashing is not installed in them.
It runs all the way down to the drip edge which it should overlap slightly.
Step flashing ensures that water is directed away from the wall and ends up in the gutter.
It is at the back of the porch roof where the roof meets the house siding.
The porch joined the house at right angles to a shed roof section.
Joining two roofs of different pitches.
This flashing may be behind wood siding or in front of a brick wall.
Different types of materials cater to the different needs of homeowners.
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.
There is another place that roof flashing has now invaded.
If your flashing is new you may need a bonding primer.
The flashing should extend over the shingles at least three inches.
Slide the right edge of the flashing under the highest roof pitch.
By john carroll download the pdf version of this article.
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.
This flashing comes in a v or w shape.
Roof material changes direction.
Gently bend the flashing using the edge of the lumber.
Valleys are those areas of the roof where two sections of roof meet at a joint and form an angled dip.
At joints and penetration points.
L shaped flashing is a versatile general use flashing used where a uniform or strengthened finish is needed on a 90 surface.
While installing flashing is not the most exciting part of roofing it is one of the critical components that a roof cannot do without.