Cut the drip cap to the correct size for your window.
Flashing on siding.
It is always recommended to install step flashing behind stucco dryvit wood panel lap siding vinyl siding cedar shingle siding etc.
Even if the roof has been properly flashed against the sidewall this one hasn t water can still run down the side of the house and behind the siding causing rot.
On a wall to be covered with wood cement board vinyl or metal.
Use a felt paper spline wrapped around the corner and extending 6 inches beyond the corner board to protect the joints where the siding meets the corner boards see figure 1 5 at left.
Using a pry bar you will need to remove a layer of siding from above the window you want to install the drip cap on.
Flashing helps prevent any moisture which can collect due to condensation or small gaps in the siding that flows downward from infiltrating behind the house wrap where it can do damage.
Attach the flashing tape above the window and then slip the drip cap into the siding and attach to the tape.
A common problem with cement board siding products and some other types of horizontal lap siding is that older installation guidelines called for caulking the joint instead of flashing the joint.
This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted in failure of the caulk joint and associated ongoing maintenance.
However in most instances step flashing should be installed behind siding.
Flashing is a strip of metal usually aluminum about 8 inches long and bent at 90 degrees with each side at least 5 inches wide.
Building siding flashing finish details for building corners use overlapping 1x4s or 1x6s at outside corners or use 5 4 stock for a heavier look.
Use an old rag to remove any dirt or debris that may be there.
Therefore the upper piece of wrap or flashing should always overlap any lower pieces.
And when those corners start to decay they become.
In certain instances flashing may need to be installed on the exterior of siding.
