Despite the fact that the building code requires the ice and water shield to overlap the drip edge, some drip edge manufacturers recommend installing the drip edge over the ice and water shield. This reversal provides superior protection in the event of an ice dam. It also allows for easier maintenance by exposing only the overlapping section of drip edge.
The drip edge should be installed so that it meets the building code requirements. If it does not, your local building authority may require you to replace or modify the drip edge in a way that satisfies their needs.
In conclusion, the drip edge should always be installed so that it covers the ice and water shield. This will provide the best protection against potential flooding caused by ice dams and other water intrusion issues.
Melting snow and ice on your roof causes ice dams. When the snow melts and refreezes in your gutters and downspouts, an ice dam forms. Ice dams can cause problems if they reach the wall of your home. The water may be able to seep under the exterior wall board and into the house.
The main cause of ice dams is temperature. If it's cold out, then ice will form when moisture in the air contacts frozen ground or other objects that have a high concentration of surface ice particles. The more exposed to the sun's heat an object is, the faster it will melt. So roofs that are directly exposed to the sun's heat will melt faster than those that shield themselves from the sun's rays. For example, white shingles will quickly melt in the summer, while black ones will not.
But roof temperature isn't the only factor that determines whether or not you'll have an ice dam. Structure, design, and location also play a role. For example, if there are large overhangs on your roof and you don't have any vegetation growing under them, then there's a good chance that some of that water will refreeze and cause additional melting and dripping.
Adding heat tapes along roof edges can melt holes through existing ice dams, preventing water back-up and leaks into the building attic or walls, as well as preventing future ice dam leaks. While adequate ventilation and insulation, as well as maybe an ice and water shield, are the most appropriate and trustworthy repairs for roof ice dam problems, heat tapes can give immediate relief when ice dam problems are already present on a structure.
The tape is made of polypropylene material and it's black in color, so it won't be visible from the street side or from inside the home. The tape is easy to install. You will need to measure off each edge of the roof carefully to ensure that you cover all areas where ice may form. Then, follow the instructions below to apply the tape:
1. First, remove any existing shingles or other roof materials to allow room for the tape to expand without tearing away at the top layer of your roof. Next, lay out sections of the tape along the edges of the roof with the adhesive side up. Make sure that you leave about 1/4 inch of space in between pieces of tape for air circulation. Finally, fold the free end of each section over onto itself and press down firmly to secure it to the roof.
2. Water should be allowed to drain from underneath the tape before it gets re-applied in order to prevent damage from occurring while not applying enough pressure could result in a leaky repair.
Snow melts and runs into the gutters when the temperature warms. Ice dams obstruct the flow of this water, causing it to pool beneath the roof shingles. When water accumulates over the waterproof protective layer, it begins to leak into your home. The more ice that forms on the roof, the higher the risk of leaks.
Leaky roofs can lead to other problems for your house, including damage to other parts of the structure and increased energy costs due to heating or cooling units needed to dry out rooms where water is leaking in. If you notice any signs of leakage, such as stains on walls or ceilings or wet floors, call a professional roofer right away so that damaged areas of the roof can be repaired before it gets worse.