Satellite Dish and Solar Panel Roof Leaks
Every hole in your roof was made by someone. Most were made by roofers, who flash penetrations for a living. A few were made by a satellite installer with a cordless drill, or a solar crew working to an electrical specification rather than a roofing one.
Those few are responsible for a disproportionate share of the leaks we trace.
Why these penetrations fail
A properly detailed roof penetration is not just a hole with sealant around it. It is flashed: meaning a metal or membrane component is woven into the shingle courses so water is directed over the top of it and away. Sealant is a supporting player, never the primary defense.
The typical non-roofing installation reverses that. A lag bolt goes through the shingle into a rafter, and a bead of sealant goes around the head. That works, for a while:
- Sealant is a consumable. It has a service life measured in a few years under ultraviolet exposure, not decades. Once it cracks, the hole is simply open.
- The fastener moves. Thermal cycling works a bolt against a rigid shingle thousands of times a year, opening a gap that no sealant bridges permanently.
- Nothing directs water. With no flashing, water reaching the penetration has no reason to go around it.
- Compression damage. A bracket torqued down onto asphalt shingles crushes and cracks them, creating additional paths independent of the bolt hole.
- Nobody inspects it. The satellite company has no ongoing interest in your roof, and mounting hardware is rarely on anyone’s maintenance list.
The abandoned dish problem
This one is extremely common. A household switches to streaming, the dish becomes redundant, and it stays on the roof for a decade because nobody thinks about it.
The dish itself is harmless. The mounting bolts are not, they are unmonitored penetrations aging under sealant that failed years ago. And when a dish is finally removed, whoever takes it down usually just unbolts it, leaving open holes in the roof.
If you have a dish you no longer use, removing it properly is a genuinely worthwhile small job: bolts out, holes correctly patched, shingles repaired or replaced. If you are having the roof replaced, decide before the work whether the dish is going back on, because reinstalling it afterwards means new holes in a new roof.
Solar, which is a bigger question
Solar arrays are a different scale of problem, and we want to be fair about it. Good solar installers use proper flashed mounts, systems designed to integrate with the roof covering rather than just bolt through it, and a well-installed array on a sound roof causes no trouble at all.
The issues arise in three situations:
- Panels installed on an old roof. This is the expensive mistake. If your roof has eight years left and the panels have twenty-five, you will be paying to remove and reinstall the array in order to replace the roof underneath it. That removal and reinstallation is a substantial cost that nobody mentions at the point of sale. If your roof is over about fifteen years old, replace it before the panels go on.
- Mounts that penetrate without flashing. Less common than it used to be, but still found. Ask specifically what the mounting system is and how it flashes into the roof covering.
- Divided responsibility. When a leak develops under an array, the solar company points at the roof and the roofer points at the mounts. Establishing in advance who warrants the penetrations, and getting it in writing, saves a great deal of argument later.
How these leaks present
Almost always some distance from the actual hole, which is why they get misdiagnosed:
- A ceiling stain that does not line up with anything on the roof, because water traveled along the underside of the deck and across rafters before dropping.
- Staining that only appears in driving rain from one direction.
- Damp insulation in the attic in one localised patch, with no obvious source above it.
- On solar, nothing visible at all for years, because the array shades and shelters the area while water quietly enters at a mount.
The diagnostic advantage is that these penetrations are a short list. If you have a leak and there is hardware bolted to your roof, that hardware is the first thing to examine.
What to do
- Inventory what is up there. Dishes, aerials, old mounting brackets, solar, security cameras, lightning protection, anything screwed down.
- Have redundant hardware removed and the holes properly repaired, not just unbolted.
- Get penetration sealant checked periodically. It is included in our roof maintenance program visits.
- Sequence solar after roofing, never before, unless the roof is genuinely new.
- Before a roof replacement, decide what is coming off permanently. It is far cheaper to not reinstall something than to reinstall it and then remove it.
Our roofing repair team handles penetration flashing and the removal of redundant hardware, and every free roof inspection covers each penetration individually. If a leak has already reached the deck, the cost of deferred maintenance explains why finding it early matters so much.
Roof penetration questions
Yes, and it is a common source. The mounting bolts pass through the roof covering and are usually sealed rather than flashed, and sealant has a service life of a few years under sun exposure. Once it fails, the holes are simply open.
If you no longer use it, yes, but have it removed properly rather than just unbolted. The bolts leave open holes that need patching and the shingles around the bracket often need repair. Left in place, it is an unmonitored penetration aging under failed sealant.
A well-installed array using properly flashed mounts on a sound roof causes no problems. Trouble comes from mounts that penetrate without flashing, and above all from installing panels on a roof that is near the end of its life.
If the roof is more than about fifteen years old, yes. Panels typically last far longer than the remaining life of an older roof, and replacing the roof later means paying to remove and reinstall the entire array, a substantial cost rarely mentioned at the point of sale.
Because water runs along the underside of the roof deck and across rafters before it drops. A ceiling stain can be several feet from the actual hole, which is why these leaks are often blamed on plumbing or condensation first.
This is worth settling in writing before installation. When a leak appears, the solar company commonly points at the roof and the roofer at the mounts. Establishing who warrants the penetrations in advance avoids a difficult argument later.