Shingle roofs currently come in hundreds and they’re now being put on houses each day. Among the hundreds of them, the question is how many have metal drip edges? In reality, almost all manufacturers who make shingle roof present it on installation instructions as manifestations of their best practices. We can now assume that failure to have metal drips on shingle roof presents the opposite of best practices. This can be vouched by ARMA a state-recognized association for roofing contractors Boynton beach FL. They have their own official manual named Residential Asphalt Roofing Manual.   

As if ARMA (and its manual) is not yet enough, there happens to be a ruling on asphalt shingles. Chapter 9 of The International One-and-Two-Family Dwelling Code reveals that “Asphalt shingles shall be applied according to the manufacturer’s printed instructions…” This goes in saying that, drip edge is important. Failure to have one clearly means that there should be a talk with your local roofer.   

 

Drip edge for roofs 

Currently, there are only a few installations of shingle roof that lack drip edges. Why is that? One reason could be is metal edging being the first thing to get removed from bid. Unless there are specifications or scopes of work that explicitly calls out, this thing will be removed in both installation and submittals. 

There was an “old timer” who tried his best to defend drip edge absence on projects. He points out that he had dedicated his life in putting shingles approximately 15 years. Within such time frame, he didn’t think that drip edges were important. Instead, he felt that the drip itself is a nuisance. He thought that if a person can extend shingles up to edge of deck, 

 

Location of drip edge that is most critical 

 

We’re all pretty much aware that location of (most critical) drip edge is the eaves. This is also we can find majority of our drips. It is supposed that rake edges are to avail metal edging. On the contrary, this supposition is not deemed critical. Installation sequence of edge metal (with felt underlayment) is optional in most of printed instructions made by the manufacturers. One can install felt at either below of the edge or on top of it. 

 

In stark contrast, that edge which receives the most amount of water on steep-sloped roof needs protection that is best and affordable. If our shingles extend to more than an inch over edge, they have the tendency to bend. This eventually fractures along edge of roof deck under. Once metal edging is allowed to be off, there will be a chance decrease for all water that cascades over eaves. This ensures entry to the gutters. On the other hand, shingles breaking with line of roof deck allow water to get into a substrate. It’s done through turning back under bottom of shingle.  

Harmful effects of such condition make the matters worse when underlayment isn’t fully extending over edge; it could also be if fascia board isn’t flushed with lower edge of wooden roof deck.