What is Drip Edge?

Drip edge is a strip of metal crucial for in the protection of both the home’s roof decking as well as the siding where the walls of the house meet the roofline.  You will often see  aluminum drip edge installed under asphalt shingles for residential applications.   

Some in the roofing community will claim it’s unnecessary to run drip edge along the sloped sides of the roof but I would disagree. This area of the roof (known as the rake) is also a vulnerable and needs extra protection. The wood is most porous along the edges and sucks in moisture like a wet rag, which over time will cause rot and affect the integrity of the entire roofing system. The moisture absorbed by the wood can cause the adhesives on the underlayment to fail, the nails holding the shingles in place will lose their ability to “grab” the wood increasing the likelihood of shingle blow offs. In my opinion the protection provided by the drip edge far outweighs the cost of installation.

There’s still more value provided by drip edge. The “L” shape formed by the aluminum channels water away from the roof line and the section of the siding where the walls meet the roof (also known as the fascia). Without drip edge, the water is liable to be blown back onto the siding and overtime the saturation will cause the siding to rot. Drip edge can work in conjunction with your gutter system to funnel the run off away from the base of the home.

Here’s a couple other helpful purposes

  • creates a seal between the roof decking and the siding stopping insects from accessing your attic
  • adds to roofs aesthetics by covering exposed wood providing uniform look
  • specialized vented drip edge can even serve to provide airflow in place of soffit vents

There are many components to a well installed roof, each with a different purpose and value. At Greater Boston Roofing, we guide you to make the best decisions for your home and budget.

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