Missing shingles: how urgent is it, really?
The honest answer depends on where the gap is, how many there are, and what the rest of the roof is doing. None of that requires going up.
A shingle is on the lawn, or there is an obvious dark rectangle in the pattern where one used to be. The question is always the same: is this an emergency, or is it a call on Monday?
The answer depends on four things you can establish from the ground.
1. Is there anything underneath?
Under the shingles is an underlayment — felt or a synthetic sheet — laid over the deck before the covering goes on. It is a secondary barrier, and this is where the widespread reassurance that "the underlayment will hold" needs qualifying. It is water-resistant, not waterproof, and it was designed to keep weather out for the days between the deck going on and the shingles going on, not for a season. On an older roof it may be brittle, and it will have a nail hole every few inches where the missing shingle was fixed through it.
So one missing shingle on a recent roof, in ordinary weather, is usually not an emergency. The same gap on a twenty-year-old roof going into a wet month is a different proposition.
2. How many, and in what pattern?
This matters more than the count. One gap in the middle of an otherwise intact slope is an isolated event — a defective shingle, an impact, a bad nail. A line of gaps along an edge — the rake, the ridge, the eave — means wind got underneath and peeled, and it tells you the seal strip is failing along that line. The shingles still up there beside the gaps may look perfect and be no longer bonded, which is why roofs sometimes seem to fail progressively over the following months. Gaps scattered across several slopes after one storm points at the roof as a whole rather than at a spot.
3. Where is the gap?
High on a slope, in the middle of a plane, water has a long way to travel and the laps below it still help. Near a valley, at the eave, or next to a chimney, skylight or wall junction, the gap is in the part of the roof that was already doing the difficult work, and it matters more.
4. What is happening inside?
This is the check worth doing, and it happens in the attic. Go up with a flashlight, find the area under the gap, and look at the underside of the deck: damp, staining, or daylight. Daylight through the deck is the one finding that turns this into a call today. Nothing visible, in the dry, on a newer roof, is the reassuring outcome — though it is worth going back up after the next real rain.
Why we do not tell you how to replace it
You will have noticed that this page has not told you to grab a pry bar, break the seal on the course above, pull the nails and slide a new one in. Practically every other page written on this search does. We want to be straightforward about why we do not.
First, the risk is not theoretical. Falls are among the most common causes of serious injury in home maintenance, and a roof slope is the classic setting. Professional roofers working at that height operate under fall-protection requirements precisely because the hazard is well established; a homeowner on a ladder with a bundle of shingles has none of that.
Second, it usually does not work well. Replacing a shingle correctly means breaking the adhesive seal on the courses above, which ages those shingles, and re-sealing properly. Done badly — and on an unfamiliar roof, with a brittle twenty-year-old covering, it frequently is — you end up with three compromised shingles where you had one gap.
Third, and most importantly, going up is not where the useful information is. The things that decide urgency — the pattern, the location, the age of the roof, whether the deck is wet — are all visible with binoculars and a flashlight.
What to do instead
Look at the whole roof with binoculars, not just the gap. Photograph it. Check the attic under it. Note the date and what the weather was doing. If it has just been a significant storm, be careful about who you deal with next: the aftermath of a storm brings a lot of pressure to sign quickly, and a roof with one missing shingle does not require a same-day decision from anybody.
Frequently asked questions
Can one missing shingle cause a leak?
It can, but often it does not immediately. The underlayment underneath gives some protection, but it is water-resistant rather than waterproof, it has nail holes where the shingle was fixed, and it gets brittle with age. On a newer roof a single gap is usually not urgent; on an old one it is.
How urgent is it?
Check for daylight or damp on the underside of the deck in the attic. Daylight makes it urgent. Otherwise, the pattern decides: one gap in the middle of a sound slope can wait, while a line of gaps along an edge means the seal is failing along that line and more will go.
Why does a roof lose more shingles a month after the storm?
Because wind breaks the adhesive seal on shingles it does not remove. Those look completely normal and are no longer bonded, so the next gust takes them. It is the same storm producing damage on a delay.
Should I replace it myself?
We do not publish steps for that. Beyond the fall risk, doing it properly means breaking and re-sealing the courses above, and done badly it turns one gap into several damaged shingles. Nothing you need in order to decide what happens next is up there anyway.
Someone knocked on my door offering to fix it. Should I?
A roof with a missing shingle does not require a same-day decision. Take the time to check licensing and insurance and to get the work specified properly. Pressure to sign immediately after a storm is itself a warning sign.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- NRCA. National Roofing Contractors Association
- US OSHA. 1926.501 — Duty to have fall protection (OSHA)