08
April
2015

Installing Flashing at All Joints

If you have ever gone through a roof inspection, you are probably familiar with the term flashing.  Flashing is designed to protect your home from water leaks and other natural elements near roofing joints.  When flashing is not installed properly can cause significant damage to the interior of your home, especially after a storm.

There are several aspects of roofing that, together, create a protective barrier from exterior elements seeping into the home.  Water is typically the most dangerous and concerning to homeowners.  Having a high quality roof with the appropriate draining system is the most important factor in protecting your home against water leaks.  And flashing is the roofing material that is help responsible for this task.

Flashing seals and protects the joints so that no water can seep into the home’s interior.  Joints are where the roof and roof mounted structures intersection.  Examples include the chimney, skylight, vent stacks, etc.  Because of the constant expansion and contractions of the roof due to humidity and changing temperatures, there is a serious risk of water leaks when flashing is not installed.

Flashing keeps rainwater out, making joints watertight without constricting the natural expansion and contraction of the roof system.  When a roof contractor installs flashing, all intersecting roofs and parapets and walls are covered with flashing.  Flashing is comprised of angled strips of corrosion-resistant metal that overlap.  This unique design keeps water from being trapped in corners and crevices and, thus, keeps water from getting into the home’s interior. 

Base flashing and cap flashing make up the entire flashing system.  Base flashing is what attaches to the roof.  This L-shaped piece of metal extends underneath the roofing material and up the vertical surface.    Cap Flashing is then attached to the projection or wall and overlaps with the base flashing.  This creates a barrier that water cannot penetrate.

One of the most common locations on the roof for flashing is valleys.  Valleys are where different roof slopes intersect.  Valleys are problematic because the intersections create low spots where water tends to pond and get underneath roofing material, which causes significant damage to the roof structure. 

Typically, corrosion-resistant metal lines valleys and forms a type of flashing.  The lining needs to extend beneath the adjacent roofing materials to prevent leaks.  In open valleys, strips of sheet metal are placed in the valley angle and roofing material is lapped over it.  This creates layers of barrier to protect the home against water and other elements.

Closed valleys, however, are restricted to specific roofing materials.  They are less common and much more complex.  Using closed valleys, flashing is arranged underneath the roofing material.  It is invisible, but still effective in keeping the joint watertight.

Flashing is crucial in protecting the home from water damage.  At Joe Hall Roofing, our contractors are trained and educated in the different techniques of placing flashing to ensure that homes and businesses are safe and secure.

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    1925 W. Pioneer Parkway
    Arlington, TX 76013-6187
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