How to Install Starlink on a Flat Roof: Ballast, Clearance and Cable-Entry Checklist

Flat roofs can give Starlink a clean view of the sky, but they also create two risks that a normal ground test does not: water ingress and an unstable mount in wind. The safest installation is the one that protects the roof system, keeps drains clear, and uses a mount approved for your exact Starlink kit.

This guide covers the planning and testing sequence. It does not replace the mount instructions, local building rules, or advice from a qualified roofer.

1. Confirm the roof and the Starlink kit

Before buying a mount or carrying equipment onto the roof:

• Identify the exact Starlink dish and router generation. Mounts are not universal, and some flat-surface mounts are compatible with only one kit.
• Check the roof warranty, lease or landlord rules, and any local requirements for rooftop equipment.
• Inspect the roof surface, parapet, drains and access route. Do not install on a roof that is damaged, soft, ponding water, or unsafe to walk on.
• Decide whether the cable can enter through an existing service route. A new roof penetration is a roofing job, not a sealant-only DIY task.
• Check the planned location with the Starlink app's Check for Obstructions tool before you drill, ballast or permanently mount anything. Scan from the same height and perspective the dish will have.

A flat roof is not automatically a clear-sky location. A parapet, chimney, tank, nearby building or raised solar panel can still interrupt the dish's view.

2. Choose the mounting approach

Non-penetrating or ballasted mount

A non-penetrating mount can avoid holes in the roof, but only if the mount is designed for the dish, roof surface and local wind exposure.

Use a proper load-spreading base or roof-rack system. Do not improvise with loose paving slabs, bricks or objects that can slide, crack the membrane, block a drain or become debris in high winds.

Before final placement:

• Confirm the ballast weight and layout from the mount instructions.
• Use roof-compatible protection pads where required.
• Keep ballast away from seams, flashings and drainage channels.
• Leave a visible path to inspect the roof and clear the drains.
• Make sure the dish, mast and cable cannot swing into a parapet or other structure.
• Recheck the mount after the first period of strong wind.

If you cannot calculate or verify the wind resistance, stop and ask a qualified installer.

Penetrating mount

A penetrating mount may be appropriate when the roof structure and mount design support it, but every hole becomes part of the roof's waterproofing system.

Use the exact flashing, fasteners and sealant specified for the mount and roof type. On membrane, bitumen or metal roofs, the correct detail depends on the roof manufacturer and construction. A bead of general-purpose silicone around a screw is not a substitute for a compatible flashing or sealed roof detail.

Have a roofer carry out or approve the penetration, especially when the roof is under warranty or the cable must pass through an insulated or fire-rated part of the building.

Low-profile or flat mount

A flat mount can be useful on a suitable roof, but do not assume that a mount advertised for one Starlink dish fits another. Confirm the model, bolt pattern, cable exit, clearance and any required rotation or alignment space in the current Starlink instructions.

3. Plan clearance and cable routing

Place the dish where it has the clearest practical view of the sky, not simply at the highest-looking point.

Allow room for:

• The dish and mount to be installed without striking a parapet or other structure.
• The dish to move or align if your model requires it.
• A safe cable bend and a supported route to the entry point.
• Roof inspection and drain maintenance.
• Snow, leaves or other debris to be cleared without climbing around the cable.

Keep the power supply indoors or in a dry, ventilated location appropriate to your kit. Route the cable so it is not pinched under ballast, dragged over a sharp edge, left in standing water or exposed to avoidable foot traffic. Use the cable type and routing limits in the instructions for your model.

At the outside entry, create a gentle downward drip path before the cable reaches the penetration. Support the cable so water cannot run along it into the building, and protect the connector from direct mechanical strain.

4. Test before making the installation permanent

A short test can prevent an expensive roof mistake.

1. Place the dish temporarily in the proposed location using the setup method allowed for your kit.
2. Run the Starlink app's obstruction scan and save a screenshot or note of the result.
3. Check that the cable reaches the router without tension or a sharp bend.
4. Run several speed and stability checks at different times of day.
5. Watch the app's outage or obstruction history rather than judging the connection from one speed test.
6. If the roof edge or parapet appears in the obstruction scan, move the planned mount or raise it only with a properly engineered solution.

Do not drill first and troubleshoot sky visibility later. A waterproof mount cannot fix a poor view of the sky.

5. Install in a controlled sequence

Once the location passes the test:

1. Read the current installation guide for the exact dish and mount.
2. Mark the final position while keeping drains, seams and inspection paths clear.
3. Install the protection layer, ballast system or flashing exactly as specified.
4. Mount the dish and confirm that all fasteners are secure without overtightening.
5. Route and support the cable, leaving the connector free from tension.
6. Keep the power supply connectors facing down or to the side where the kit instructions call for that orientation.
7. Power up and wait for the dish to complete its startup sequence.
8. Re-run the obstruction check and confirm the dish is online.
9. Record a baseline speed, latency and outage result for future troubleshooting.

Take photos of the finished flashing, ballast layout and cable route. They make future roof inspections and support requests much easier.

6. Inspect after the first rain and strong wind

The first inspection is part of the installation, not an optional extra. Look for:

• Water marks or dampness around the cable entry.
• Ponding or blocked drainage near the mount.
• Lifted, shifted or cracked ballast or protection pads.
• Cable rubbing against a sharp edge or being pulled by wind.
• Loose fasteners, movement at the mast or contact with the parapet.
• New obstruction alerts after the dish settles or nearby equipment changes.

If water enters the building, disconnect power only if it is safe to do so and contact a qualified roofer or electrician. Do not keep adding sealant around a wet or moving penetration.

When to stop and hire a professional

Use a qualified installer or roofer when the job involves working near an unprotected edge, cutting a roof membrane, crossing a fire-rated wall, bonding or grounding metalwork, calculating wind loads, or lifting equipment onto the roof. Starlink's own guidance says to seek professional assistance when the installation cannot be completed safely.

Quick flat-roof checklist

• [ ] Exact dish and mount compatibility confirmed.
• [ ] Roof warranty, access and local rules checked.
• [ ] Obstruction scan completed at the planned height.
• [ ] Drains, seams and inspection paths kept clear.
• [ ] Ballast or flashing matches the roof and wind conditions.
• [ ] Cable route avoids standing water, sharp edges and foot traffic.
• [ ] Drip path and cable support installed at the entry.
• [ ] Post-install obstruction, connection and leak checks completed.

Official references

• How do I install Starlink for best performance?
• How to check for obstructions
• Starlink V5 Home Mount setup guide
• Starlink Flat Mount installation guide

Starlink hardware and installation guidance can change. Always use the current instructions for the exact kit and mount you own.