Drip Edge Is Code in Michigan: A Note From the Permit Desk

Most of what a reroof estimate lists is visible from the driveway: shingle color, squares, whether the old layer comes off or gets covered. Drip edge is not that kind of line item. It is a strip of formed metal tucked under the shingle at the eaves and rakes, and a homeowner may never see it at all. It is also, under the residential code Michigan uses, not optional. This note covers what the requirement says, why it exists, and what its absence tends to look like a decade later.

01 /What the code actually requires

Michigan builds to the Michigan Residential Code, its own adoption of the International Residential Code with local amendments. Within it, asphalt shingle roof coverings carry a specific provision requiring metal drip edge along the eaves and rakes, the gutter-line edge and the sloped edges up the roof's sides. The provision sets minimum expectations for the metal, how far it extends onto the deck and over the fascia, how much adjoining pieces overlap, and how it is fastened. We will not invent the exact section number, edition year, or dimensions from memory here, because a stale citation does a homeowner more harm than an honest gap. See Michigan Residential Code 2015, section R905.2.8.5 (drip edge).

What is not in question: drip edge is required metal, not felt or shingle overhang alone, at both edges that shed water. A roofer who calls it a nice upgrade rather than a code item is either mistaken or hoping you will not ask twice.

02 /Why the detail earned a code section

Shingles are good at shedding water down a slope. They are not designed to control where that water lands once it clears the last course. Without metal drip edge, water sheeting off the eave can cling to the underside of the tab by surface tension and travel backward onto the fascia and raw deck edge instead of dropping into the gutter. Wind-driven rain makes it worse at the rakes, pushing water sideways under the shingle edge onto exposed deck and trim. Metal drip edge breaks that path, giving water a hard edge to let go of cleanly, away from the wood underneath. That is also why the detail sits next to underlayment and ice barrier requirements in the code, not a finish-and-trim chapter: it is water management doing a structural protection job, even though it looks like a $2 strip of metal from the ground.

03 /What a missing drip edge looks like years later

A roof without proper drip edge rarely fails the week it is installed. It fails on a schedule measured in seasons, as the same wood gets wet and dries, freeze after freeze. What we see on inspections where the detail got skipped tends to follow a pattern: soft, discolored fascia at the eave line, paint peeling where the shingle overhangs, rafter tail rot hiding behind gutters that looked fine from below, and a soft or delaminating deck edge along the rakes that a hand can flex before the eye catches it. None of that reads as a roof problem at first glance. It reads as a fascia or gutter problem, until someone lifts a shingle course and finds the actual cause underneath.

04 /What this means for a Macomb County reroof

The fix going forward is simple and cheap relative to almost anything else on a roof: install the drip edge the code already requires, correctly lapped and fastened, on every reroof. The harder question is what to do with a house that has gone years without it. If fascia or deck-edge rot has already set in, that is a repair question, and repairs run $350 to $3,200, with larger carpentry repairs able to run higher depending on how much wood the water reached. If the missing drip edge is one symptom among several on an aging roof, a full reroof may be the more honest answer, and asphalt replacement in Macomb County typically runs $9,000 to $18,000, with most homes landing between $12,000 and $16,000.

We inspect eaves, rakes, and the fascia line for free, at no cost or obligation, and tell you plainly whether drip edge is present, missing, or doing its job. If a past storm opened the door for water to reach the deck edge, that finding belongs with our storm damage service. For which code edition governs your house right now, read which building code covers your roof in Michigan; for the fastening rule beside drip edge in the same chapter, see four nails or six, what code and wind maps say; and for the gutter's own tell, read granules in the gutter and a roof's wear line.