Drip Edge Install Mistakes That Rot MA Fascia

Drip edge is required on every asphalt-shingle roof in Massachusetts, at both eaves and rakes, per IRC R905.2.8.5 as adopted under 780 CMR. The piece has to extend at least 1/4 inch below the roof sheathing and at least 2 inches back onto the deck, with adjacent sections overlapped at least 2 inches and fasteners no farther apart than 12 inches. Underlayment goes OVER the drip edge at the eave and UNDER the drip edge at the rake. That last sentence is where most fascia rot in MA starts, because it inverts the install sequence many roofers still default to.

This is a small, dumb-looking strip of bent metal at the edge of your roof. It is also the reason the bottom three feet of your fascia is soft after eight winters even though the shingles still look clean from the street.

What does Massachusetts code actually require?

The current Massachusetts Residential Code is the 10th edition of 780 CMR, which adopts the 2021 International Residential Code (IRC) chapter 9 for roof assemblies. R905.2.8.5 is the drip-edge section, and it applies to every asphalt-shingle reroof and new roof in the state. Here is the code minimum, broken out so you can hand it to a contractor.

Spec	Code minimum (R905.2.8.5)
Location	Required at eaves and rake edges of shingle roofs
Material	Corrosion-resistant non-staining metal
Extension below sheathing	Not less than 1/4 inch
Extension back onto roof deck	Not less than 2 inches
Overlap of adjacent segments	Not less than 2 inches
Fastener spacing	Not more than 12 inches on center, into the roof deck
Underlayment at eaves	Installed OVER the drip edge
Underlayment at rakes	Installed UNDER the drip edge

Two notes the code does not spell out but inspectors care about. First, fasteners go into the roof deck, not into the fascia. A nail through the vertical leg into the fascia binds the metal and starts splits at the nail head, then water tracks in. Second, the ice barrier required under R905.1.2 (the rubbery self-adhered membrane, often called ice and water shield) has to extend from the eave edge to at least 24 inches inside the exterior wall line of the heated space. The drip edge sits under that ice barrier at the eave. If your roofer ran the ice barrier first and then tucked the drip edge on top, the install is backwards.

For more detail on the ice barrier rule, see our ice and water shield code in Massachusetts guide. This article stays on the drip edge itself.

Eave drip edge vs rake drip edge: they are different parts

Most "drip edge" cost quotes lump everything together. There are really two parts doing two jobs.

Eave drip edge (often sold as "gutter apron" or a T-profile) sits at the bottom edge of the roof, kicks water past the fascia, and dumps it into the gutter. The horizontal leg of the metal is the part that matters. If the leg is too short the water curls back under and onto the fascia (capillary creep), which is why a gutter apron with a longer kick-out leg is the better part on any house with gutters.

Rake drip edge sits along the gable ends, the sloped sides where there is no gutter. Its job is to stop wind-driven rain from blowing sideways under the shingle edge into the rake fascia and the gable-end framing. The L-profile is standard. The rake piece always laps OVER the eave piece at the bottom corner, because water runs downhill and the upper piece has to shed onto the lower piece. We see this reversed often, and it is exactly the funnel the GAF tech bulletin warns against.

The five install mistakes that rot MA fascia

These are the failure modes our directory contractors flag on tear-off inspections across MA. Walk your driveway with this list before you sign off on a finished job.

1. Underlayment under the drip edge at the eave. The IRC and 780 CMR call for the ice barrier (and underlayment) to run OVER the drip edge at the eave. The older sequence, drip edge first, then underlayment, leaves the metal exposed to wind-driven water that gets behind it and onto the sheathing edge. If your roofer learned the trade before 2012 there is a real chance they were taught the wrong order and never updated.

2. Eave drip edge laps OVER the rake at the corner. It should be the other way around. The rake piece comes down the gable last and overlaps the eave piece by at least 2 inches at the corner so any water running off the rake gets dumped onto the top of the eave metal, not behind it. The wrong overlap at the corner is the classic "tidy from the street, soft fascia in five years" mistake.

3. Nailed through the vertical leg into the fascia. Code says fasteners go into the roof deck, every 12 inches max. Nailing through the front into the fascia binds the metal so it cannot expand on a hot July roof, then the nail heads split the fascia paint and water tracks in along the nail shank. Roofing nails through the top, never through the face.

4. No kick-out flashing at the wall-eave junction. This is a separate part, not the drip edge, but a code-compliant drip edge plus a missing kick-out still rots the wall. Wherever a roof eave dies into a sidewall (a common detail on dormers, additions, and porch roofs), a kick-out diverter has to push gutter-line water away from the siding. We have pulled siding off Boston triple-deckers and Cape ranches where the entire wall cavity below the missing kick-out was black. R903.2.1 covers it, and most homeowners have never heard of it. Read up on this in our chimney and flashing leaks in Massachusetts guide.

5. Drip edge ends at the gutter face, not past it. The horizontal leg should overhang far enough that water drops cleanly into the gutter, not onto the back wall of the gutter or the fascia behind it. If you can run a finger between the drip edge and the back of the gutter and feel daylight, the install is right. If the metal stops flush with or behind the gutter, the gutter overflow path is across your fascia. See our gutters and downspouts in Massachusetts guide for how the eave drip edge and the gutter back have to work as a pair.

Coastal MA: aluminum or galvanized?

If you live on the Cape, the South Coast, the North Shore, or anywhere salt air reaches the roof line, the drip-edge metal matters more than the shingle warranty. Mill-finish galvanized steel will streak rust within a couple of seasons in salt air and the rust bleeds onto the fascia and the gutter. Aluminum drip edge (white, brown, or mill-finish) does not have that problem and is the default we see on Cape and Islands jobs. On inland MA either works, and painted galvanized is fine. The code does not name a specific metal beyond "corrosion-resistant non-staining," so this falls into ask-your-contractor territory, but ask them.

How to write it into the contract

Three lines in the scope of work and you will not have to think about any of this again. Most directory roofers will not blink at them, and the ones who do tell you something useful about the rest of the spec.

• "Drip edge at all eaves and rakes per IRC R905.2.8.5, minimum 5-inch face metal, corrosion-resistant aluminum or painted galvanized, installed UNDER underlayment at rakes and OVER drip edge / under underlayment at eaves per code."
• "Ice and water shield to extend at least 24 inches inside the heated wall line at all eaves per R905.1.2, installed over the eave drip edge."
• "Kick-out diverter flashing installed at every roof-to-sidewall junction per R903.2.1."

If you want a broader template, our how to hire a roofer in Massachusetts guide has the full contract-language checklist.

Frequently asked questions

Is drip edge actually required on a reroof in Massachusetts, or just on new construction? It is required on both. 780 CMR adopts IRC chapter 9, which calls for drip edge at eaves and rakes on shingle roofs. Reroofs in MA pull a building permit and the inspector can fail the job for missing or wrong-side drip edge.

Does the drip edge go on top of or under the underlayment? Both, depending on where. At the eave, underlayment goes OVER the drip edge. At the rake, underlayment goes UNDER the drip edge. That ordering is the most common mistake in older crews and the single most useful sentence in this article.

What is the difference between drip edge and gutter apron? Gutter apron is a longer-legged version of eave drip edge, with a wider hemmed face that drops down behind the front lip of the gutter. It is the better eave part on any house with gutters because the longer leg eliminates capillary creep back onto the fascia. Code accepts either as long as it meets R905.2.8.5 dimensions.

Can drip edge be added to an existing roof without a full tear-off? Not properly. To install drip edge you have to lift the shingle edge, slip the metal under (at rakes) or over (at eaves), and re-set. Doing that on a brittle 15-year-old roof will crack shingles. If you are within a couple of years of replacing the roof anyway, hold off and address it during tear-off. If you have a specific localized rot problem, replacing a few feet of shingles to install a section of drip edge is reasonable.

How can I tell from the ground if my drip edge was installed wrong? Three checks. One, look at the corner where eave meets rake: the rake piece should sit on TOP of the eave piece. Two, look along the eave behind the gutter: the drip edge should overhang past the back of the gutter, not stop short of it. Three, look at the fascia for streaking, especially near the bottom corners of the roof. Streaks running down the fascia from behind the gutter mean water is getting behind the metal.

Get a quote on a roof with the drip edge done right

If you are about to sign a roofing contract in Massachusetts and any of the three contract lines above made you nervous, get a second quote from a roofer who will read them back to you without flinching. Request estimates from MA roofers on our directory, or browse the full Massachusetts roofing hub, and ask each one to spec the drip-edge install in writing. The price difference between a code-compliant drip-edge install and a sloppy one is usually under a few hundred dollars on a typical MA tear-off, and that few hundred dollars is what stands between you and a $4,000 fascia and sheathing repair seven winters from now.