What causes a metal to undergo a galvanic reaction?

When dissimilar metals are in contact with one another in the presence of an electrolyte, galvanic action occurs, resulting in the deterioration of the metal with the lower galvanic number. The electrolyte may be rain water running from one surface to another, or moisture from the air containing enough acid to cause it to act as an electrolyte.

How big are the drip edges at Home Depot?

Peak Products Drip Flashing, 2 x 7/8 x 3/8 In. – Galvanized Peak Products Drip Flashing, 2 x 7/8 x 3/8 In. – White Galvanized Peak Products Drip Flashing, 2 x 7/8 x 3/8 In. – Brown Galvanized

What are the reactions between copper and other materials?

Weathering, Corrosion, Staining, Substrate, Solder, Sealants. One of the most important issues concerning the use of copper is the chemical reaction between copper and other materials. Chemical reactions are responsible for corrosion, staining, and even the green patina that develops on copper surfaces over time.

What happens when shingles are placed on copper?

If shingles rest directly on the copper, the corrosive effect is amplified because moisture is held along the edge by capillary action resulting in “line-corrosion”. The solution is to raise the lower edge of the shingles with a cant strip, or to provide a replaceable reinforcing strip between the shingles and the copper.

Where to put drip edge on metal roof?

Hemmed Drip Edge: Applied with metal and standing seam roofing, an open hemmed drip edge will deter water from going upward as a result of capillary action and passing the drip-edge metal. L Drip Edge: Utilized on low incline roofs, L shape drip edges are situated on the roof deck and atop the fascia board.

What do you need to know about drip edge?

Before you start the installation, remove all dirt and debris from the roof and take the measurements of the exterior edges to determine how much drip edge is required for the project. Cut Lengths: Use a metal snip to divide the portions of the drip edge in accordance with your measurements.

Do you need to install flashing behind drip edge?

If the gutter is lower than the bottom edge of the drip edge, install flashing behind the drip edge and over the back edge of the gutter to remove the gap. When you choose a reliable roofing contractor, you can feel confident that you are getting the work done right the first time.

What happens if you overlay drip edge on roof?

If there is a gap resulting from an unsuccessful overlay, it may result in water flowing behind the edge instead of into the gutter. This is known as back flowing gutters, which can cause water damage to your home and roof system. If you run into issues with the overlap and need to resolve the gap, review the following tips: