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.
Roof flashing vs counter flashing.
Vinyl siding can double as counter flashing as long as the step flashing goes underneath it.
Such a system usually consists of copper counterflashing and base flashing in conjunction with roof composition flashing or coping.
The roof side of the copper is cleated to the nailable cant strip.
The counterflashing diverts water to the base flashing which in turn diverts it to the composition flashing.
The base flashing is designed to accommodate building movement.
It is used for roof to wall flashing.
Step flashing is a rectangular piece of flashing bent 90 degrees in the center.
Posted june 10 2019by james fick counterflashing also referred to as cap flashing is the first line of defense against water infiltrating your building.
Depending on the construction situation a step flashing roof is sufficient.
The roof composition flashing extends up the cant strip over the coping and part way down its face under the copper flashing.
It laps the composition flashing at least 4.
Is that counterflashing is construction formed metal or elastomeric sheeting secured on or into a wall curb pipe or other surface to cover and protect the upper edge of a base flashing and its associated fasteners while flashing is roofing components used to weatherproof or seal roof system edges at perimeters penetrations walls expansion joints valleys drains and other places where the roof covering is interrupted or terminated.
Continuous flashing has always been used at a headwall an intersecting wall at the top of a roof plane and perpendicular to the slope.
On the opposite side a continuous copper edge strip is attached to the coping and the lower edge is bent to form a drip.
This final layer is called counter cover or cap flashing and commonly consists of aluminum galvanized steel copper tin or even plastic.
Step flashing has been required for asphalt shingles at roof to wall intersections as far back as the 1986 cabo.
Placed opposite to base flashing or above base flashing counter flashing completes the two part team.
