The Short Answer
Satellite dishes, antenna masts, sign brackets, light clips and lightning rod bases leak because they are usually fastened with lag screws driven through the shingles and sealed only with caulk. Sealant shrinks and cracks within a few seasons, wind rocks the mount, and freeze-thaw opens the holes. The fix is to remove unused mounts and repair the holes with new shingles or flashing, and to put any mount you keep on a flashed base or off the roof entirely.
Key Points
- A dish foot bolted through shingles relies on sealant alone, which is the weakest way to keep water out of a roof.
- Abandoned mounts are a common hidden leak: the dish is gone or unused, but the bolt holes and dried sealant remain.
- The FCC antenna rule protects your right to a dish on property you control, but not on a condo or apartment common roof, and it allows mounting off the roof.
- Shingle warranties typically exclude damage caused by equipment added after installation, so a mount leak is a workmanship problem, not a shingle defect.
- Lightning protection parts should be removed and reinstalled by a lightning protection specialist, not left loose after a roof repair.
Why Bolting Things Through Shingles Leaks
Shingles work by overlapping. Water runs down the face of one shingle onto the next and never has a reason to go sideways or uphill. A screw through the middle of a shingle breaks that pattern: it makes a hole in the layer that is supposed to shed water, and only sealant stands between the hole and the deck.
The Michigan Residential Code expects penetrations to be flashed. Section R903.2 says flashings shall be installed in a manner that prevents moisture from entering the wall and roof, including at penetrations through the roof plane. Vent pipes get a boot and chimneys get step flashing and counterflashing. A dish foot screwed down with a bead of caulk around it is not flashing in that sense.
Sealant also has a short service life on a roof. It is exposed to sun, heat on dark shingles in summer and cold in winter, and it shrinks and hardens as it ages. Once it cracks, water follows the screw threads into the deck. Because the screws often land in the plywood between rafters rather than in framing, the mount can also flex in wind, working the holes larger.
Sealant vs repair
Where caulk and roofing cement belong on a roof (very few places) and why tar jobs leak again.
Sealant vs real repairThe Usual Suspects on a Michigan Roof
Satellite dishes
Four to six lag screws through a metal foot
The most common. The foot sits on the shingles, the screws pass through them, and sealant goes under or around the foot. Ice can also build up behind a dish on a low-slope area.
Old TV antennas
Tripods and masts with guy wires
Tripod feet are screwed through shingles like dish feet, and guy wire anchors add more holes. Many antennas were left in place for decades after cable arrived.
Chimney-strapped masts
Not a roof hole, still a problem
Straps around a chimney do not penetrate shingles, but a swaying mast can loosen mortar and crack the chimney crown, which then leaks.
Holiday light clips and hooks
Small holes, many of them
Nails or screws driven into shingles for light hooks leave dozens of small holes along the eave, right where ice dams back water up in winter.
Lightning rods
Air terminals and cable clips
Bases and cable fasteners are attached across the roof. When done to the standard they are sealed and fastened properly, but older systems and disturbed parts can leak.
Signs, flagpoles and brackets
Commercial and porch roofs
Sign frames and brackets fastened through a membrane or shingles carry wind load into a small area of roofing, which tears or loosens over time.
How to Tell a Mount Is the Leak
Mount leaks tend to be slow and steady rather than dramatic. Because water follows the screws into the deck and then runs along it, the stain inside may be a few feet downslope from the mount. In the attic, look directly under the mount first, then follow the deck boards or panels downhill.
- Rust-colored or dark streaks on the attic deck, centered on a cluster of screw tips coming through.
- Screw tips that are wet, rusty or frosted in winter right below where the dish or antenna sits.
- From the ground or a ladder: cracked, peeling or missing sealant around the mount feet, or a mount that moves in the wind.
- Shingles around the mount that are cracked, lifted or sunken from someone standing on the same spot to aim the dish.
- A ceiling stain that grows after wind-driven rain from one direction, when wind pushes water against the uphill side of the mount.
Do not climb onto the roof to check. Binoculars from the yard or photos from a ladder at the eave are enough to spot dried sealant and a loose mount.
What Michigan Winters Do to Roof Mounts
West Michigan adds two pressures that make mount leaks worse. Lake-effect snow drifts against anything that sticks up from the roof, and a dish facing south across a roof plane can hold a drift and an ice layer behind it for weeks. When that snow melts by day and refreezes at night, water sits against the mount's sealant and works into any crack.
Wind is the other. Strong gusts off Lake Michigan load a dish like a small sail. Each gust pries slightly at the screws, and over several winters that movement loosens them in the deck. Holiday light hooks along the eave sit in the ice dam zone, where water backs up under shingles even on a roof with no holes in it.
Lake-effect snow
How lake-effect bands drift snow onto lee slopes, valleys and around roof objects.
Lake-effect snow and roofsWhat the FCC Antenna Rule Allows, and Where It Stops
Many homeowners think a dish must go on the roof. It does not. The Federal Communications Commission's Over-the-Air Reception Devices rule (47 CFR 1.4000) protects your right to install a satellite dish one meter or less in diameter, or a TV antenna, on property you own or rent and have exclusive use of. It overrides local laws, homeowner association rules and lease terms that unreasonably delay, increase the cost of, or prevent good reception.
The rule has limits that matter for roofs. The FCC says it does not apply to common areas owned by a landlord or an association, and in many Michigan condominiums the roof is a common element under the master deed, so a condo owner usually cannot insist on a roof mount. For renters, the FCC says a landlord may prohibit drilling holes through exterior walls or the roof to prevent damage. Associations may set written placement preferences, such as the side or rear of a house, as long as reception is not impaired. Masts more than 12 feet above the roofline may need a local permit for safety reasons.
The practical point: a wall bracket, a pole in the yard or a fascia mount often gets the same view of the sky without a single hole in the roof. Ask the installer about those options before the ladder goes up.
Condo roofs
Who controls and pays for the roof under the Michigan Condominium Act and your association documents.
Condo roof leaksHOA rules
Michigan HOAs, deed restrictions and approvals for exterior changes.
HOA and deed restrictionsWho Pays When a Mount Leaks
A leak at a dish foot is almost never a shingle defect. CertainTeed's 2026 shingle warranty, for example, excludes damage caused by structural changes, alterations or additions, or by equipment such as aerials and signs installed after the shingles, and it says the cost of removing or replacing overburden, including satellite dishes and solar panels, is the property owner's responsibility. Other manufacturers' warranties have similar exclusions; read yours.
That leaves the installer's workmanship. If the dish was installed recently, contact the service provider or installer in writing, with photos, and ask how they will fix it. If it was installed years ago or the service is gone, the repair is usually on the homeowner. A roofer's craftsmanship warranty on a repair covers the roofer's own work, not a mount someone else adds later.
Repair warranties
Craftsmanship vs manufacturer warranties and what each one covers.
Warranties explainedHow an Old Mount Is Removed and the Roof Repaired
- Step 1
Disconnect Safely
The cable and ground wire are disconnected and the dish or antenna is taken down. Ground wires are an electrical item; if the dish ties into a ground rod or panel bond, that end is left for the service provider or an electrician.
- Step 2
Back Out the Screws
Lag screws come out of the deck. Pulling them can tear the shingle under the foot, which is expected; that shingle is coming out anyway.
- Step 3
Check the Deck
With the damaged shingles lifted, the roofer checks the deck around each hole. Small holes in sound wood are filled; soft or rotted wood is cut out and replaced.
- Step 4
Replace the Shingles
The punctured shingles are removed and new ones are woven in, nailed in the correct nail zone and sealed down, so the overlap pattern is restored. Matching color may be close rather than exact on an older roof.
- Step 5
Check the Ceiling Side
If water got in for a long time, the attic insulation and ceiling below may need drying or repair by the right trade once the roof is closed.
Squirting sealant into the empty screw holes and leaving the old shingle is the cheap version. It may hold for a while, but it is the same weak detail that caused the leak.
If a Mount Has to Stay on the Roof
Sometimes the roof is the only place with a clear view, or a lightning protection system has to stay. In that case the goal is to make each attachment behave like a flashed penetration rather than a hole with caulk around it.
- Mount near the ridge or on a wall instead of in the middle of a slope, and never in a valley or at the eave, where water and ice concentrate.
- Fasten into framing where possible, not just the deck, so the mount does not rock in the wind.
- Use a flashed mounting base, where a metal flashing plate slides under the course above and over the course below, so shingles shed water around the attachment.
- Use nail-free clips that grip the gutter or shingle edge for holiday lights, never nails or screws into the shingles.
- For lightning rods, have a lightning protection contractor remove and reinstall parts during any roof work. The Lightning Protection Institute advises that re-roofing be coordinated with a qualified lightning protection contractor, using roofing-compatible adhesives or approved anchoring, and points to the LPI 175, NFPA 780 and UL 96A standards.
Common Roof Mounts: Keep, Move or Remove
| Mount | Why it leaks | Usual best option |
|---|---|---|
| Unused satellite dish | Dried sealant around lag screws | Remove and replace the punctured shingles |
| Satellite dish in use | Sealant-only attachment, wind movement | Move to a wall or pole mount, or re-mount on a flashed base |
| Old TV antenna tripod | Feet and guy anchors through shingles | Remove and repair, or move to a wall-mounted mast |
| Holiday light hooks | Many small holes at the eave | Remove, repair holes, switch to nail-free clips |
| Lightning rods | Disturbed or poorly sealed bases | Keep; specialist removes and reinstalls during roof work |
| Sign or flag brackets | Wind load tears roofing | Move to a wall or structure, or engineer a flashed curb |
Leak Near a Dish or Old Antenna?
We will check the mount and the deck under it, remove what you no longer need, and repair the roof so the overlap is right again. Small jobs like this can often be bundled with other repairs in one visit.
Related Guides
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The roof penetration that does get proper flashing, and how it fails.
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Learn MoreWhy Roof Leaks Show Up Far From the Source
Tracing water from a mount down the deck to the stain.
Learn MoreRoof Leak Repair
How we find and fix leaks of every kind.
Learn MoreQuestions We Hear
Should I remove a satellite dish I no longer use?
Yes, in most cases. An unused dish still has its screws through the shingles, and nobody is checking the sealant anymore. Removing it is only half the job, though: the punctured shingles should be replaced and any soft deck repaired, not just the holes filled with caulk. If your provider still owns the equipment, check whether they want it back before it is taken down.
Can my HOA stop me from putting a dish on the roof?
The FCC's rule limits how far an association can restrict a dish of one meter or less on property you own and control, but it allows written placement preferences that do not hurt reception, and safety rules. If you live in a condominium where the roof is a common element, the rule usually does not give you a right to mount there. Read your association documents and the FCC's guidance.
Is caulk around a dish mount enough to stop a leak?
Only for a short time. Sealant dries, shrinks and cracks on a roof, and the screws behind it stay in the deck. Fresh caulk can slow a leak until a proper repair, but the lasting fix is removing the mount or putting it on a flashed base so the shingles shed water around it instead of relying on a bead of sealant.
Do holiday light clips damage shingles?
Clips that slide onto the shingle edge or gutter without fasteners generally do not, as long as nobody bends shingles back in cold weather, when they crack easily. Nails, staples and screw hooks driven into shingles do damage them, and they are usually placed along the eave, where ice dams push water up under the shingles in a Michigan winter.
Can a roofer remove and reinstall my lightning rods?
A roofer can work around a lightning protection system, but the Lightning Protection Institute recommends that removal and reinstallation be handled or supervised by a qualified lightning protection contractor, with reference to the LPI 175, NFPA 780 and UL 96A standards. Plan the roof repair and the lightning protection work together so parts are not left loose or disconnected.
What This Page Cites
- 47 CFR 1.4000 Restrictions impairing reception of television broadcast signals, direct broadcast satellite services or multichannel multipoint distribution services, Electronic Code of Federal Regulations (https://www.ecfr.gov/current/title-47/chapter-I/subchapter-A/part-1/subpart-S/section-1.4000), accessed October 2026
- Over-the-Air Reception Devices Rule (consumer guide), Federal Communications Commission (https://www.fcc.gov/media/over-air-reception-devices-rule), accessed October 2026
- Asphalt Shingle Residential Products 2026 Limited Warranty, CertainTeed (https://pdf.lowes.com/productdocuments/250c3ee7-3990-4e2b-b4b8-d0e319b1c249/85880401.pdf), accessed October 2026
- 2015 Michigan Residential Code, Chapter 9 Roof Assemblies, Sections R903.2 and R903.2.1, UpCodes (https://up.codes/viewer/michigan/mi-residential-code-2015/chapter/9/roof-assemblies), accessed October 2026
- Lightning Protection Systems for Re-Roofing Projects: The Importance of Trade Coordination and Expert Consultation, Lightning Protection Institute (https://lightning.org/lightning-protection-systems-for-re-roofing-projects-the-importance-of-trade-coordination-expert-consultation/), accessed October 2026