Timberland Exteriors Blog

Kick-out Flashing for roofs

Posted by Paul Trautmann on Wed, May 16, 2012 @ 08:30 PM

Because of the volume of water that can pour down a sloped roof, one of the most critical flashing details occurs where a roof intersects a sidewall. And one of the most common mistakes in a roofing project is the failure to install Kickout Flashing along the wall and roofline where needed.  This $2.00 piece of metal can save thousands of dollars in potential damage to your walls both inside and outside your home.

Kickout flashing, also known as diverter flashing, is a special type of flashing that diverts rainwater away from the cladding and into the gutter or away from the house. When installed properly, they provide excellent protection against the penetration of water into your home. 
1. Kickout flashing must be angled a minimum of 100° to allow for proper drainage.
2. Kickout flashing seams must be soldered ofr sealed with an appropriate sealant.
Several factors can lead to rainwater intrusion, but a missing kickout flashing, in particular, often results in concentrated areas of water accumulation and potentially severe damage to exterior walls. When installing a new roof it is important to make sure that kickout flashing is present where they are needed and that they are installed correctly. Water penetration into the cladding can occasionally be observed on the exterior wall in the form of vertical water stains
Problems leading to rotten siding, water damage and mold
The kickout was never installed.
  • The need for kickout flashing developed fairly recently and manyKickout Flashing resized 600 roofing contractors don't pay close enough attention to their importance.  The increased amount of insulation and building wrap that is used in modern construction makes buildings less breathable and more likely to sustain water damage. Kickout flashing prevents rainwater from being absorbed into the wall and is more essential than ever.
The following are locations where kickout flashing is critical:
  • anywhere a roof and exterior wall intersect, where the wall continues past the lower roof-edge and gutter. If a kickout flashing is absent in this location, large amounts of water may miss the gutter, penetrate the siding, and become trapped inside the wall; and 
  • where gutters terminate at the side of a chimney.

When kickout flashing is missing or  improperly installed.
  • The bottom seam of the flashing must be watertight. If it is not, water will leak through the seam and may penetrate the cladding. 
  • The angle of the diverter should never be less than 100 degrees.

The kick-out was modified by the homeowner.
    • Homeowners who do not understand the importance of kickouts may choose to alter them because they are unsightly. A common 
way this is done is to shorten their height to less than the standard six inches (although some manufacturers permit four inches), which will greatly reduce their effectiveness. Kickout flashings should be the same height as the side wall flashings. 
  • Homeowners may also make kickout flashings less conspicuous by cutting them flush with the wall. 


For a free roof inspection call Timberland Exteriors at 651-439-1760.

Tags: Kickout Flashing, Kick-out Flashing, diverter flashing

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