This illustration shows proper flashing at a headwall condition.
Roof to wall intersection flashing.
Bigger step flashing is better.
Must be kept up off the surface of the roof a minimum 1 some manufacturers of exterior wall coverings require.
Use step flashing that has a 2 to 4 inch longer vertical leg than normal.
A headwall is a level junction where a roof meets a wall.
The narrower step flashing just isn t wide enough to protect the intersection fully.
Finally the housewrap can be laid up on the wall to cover the top of the kickout diverter and step flashings.
Below is a sketch of what the flashing at roof to wall intersections should look like.
Yes there will be a little more exposed metal along the rake walls head walls and chimneys but this through the wall z bar flashing will look very nice if pre painted.
There have always been problems with the flashing details at head walls rake walls and chimneys especially if stucco brick or stone veneer is used.
Self adhered flashing must comply with aama 711.
Roof leg and a 7 in.
Flashing must be installed at wall and roof intersections and at built in gutters.
The current flashing details in the 2013 international residential code irc for sloped roof wall intersections are very difficult to construct.
Proper roof wall flashing example.
I recommend 12 in wide step flashings bent for a 5 in.
Chapter 9 roof assemblies section r903 2.
To install the roof wall flashing above the builder bent the top edge of the flashing into a 90 degree lip about 2 cm in width.
At roof to wall intersections see figure 1.
82 build supplement flashings section 4 roof wall intersections figure 79b step 2.
That lip is then set into a reglet or groove in this case cut into the mortar joint of the brick wall above.
Do not seal housewrap or building paper to step flashing.
Roof to wall flashing.
Tape the top of step flashing with 4 inch wide minimum self adhering modified bitumen roof tape.
Headwall flashing should extend up behind the exterior wall covering and down over the roof covering material as you see here.
All exterior wall coverings whether it is wood siding vinyl siding brick or stone veneer stucco etc.
Figure 79a flashing the junction step 1.
As a result most typical construction does not use any type of through the wall flashing which results in leaky wall complaints.
For deck flashing.
Step 2 flashing 2 covers both the apron flashing upstand and the wall underlay.
