A Complete Guide to Silicone Roof Restoration
Can you coat a metal roof?
Yes.
If the metal roof is still structurally sound, there is a very good chance it can be restored with Countryman silicone roof coatings instead of replaced.
That does not mean you roll our coating over whatever is up there and call it a day.
Metal roofs are pretty forgiving, but they still expect you to do the job right.
The panels need to be sound. Rust needs to be evaluated. Seams and fasteners need attention. The roof needs to be clean. And our silicone needs something solid to stick to.
Get those things right, and an old metal roof can often have a lot more life left in it than it appears.
What Is the Best Coating for a Metal Roof?
There are several types of roof coatings used on metal, including acrylic, urethane, and silicone.
For aging metal roofs, we generally prefer 100% silicone, which is why our restoration system is built around Countryman Silicone Top Coat and Heavy-Duty Silicone.
Silicone has several properties that make it well suited for metal roof restoration:
- It remains flexible as the roof expands and contracts
- It resists UV exposure
- It creates a continuous waterproof membrane
- It can handle prolonged water exposure better than many water-based coatings
- Ours can usually be applied in a high-build application
- It works well around seams, fasteners, and other common metal-roof trouble spots
That does not mean our silicone is automatically the right answer for every roof...
Start With the Metal, Not the Coating
Before deciding how to coat a metal roof, figure out whether the roof is worth coating in the first place.
Walk the roof and look at the panels.
Surface rust is one thing.
Metal that has rusted through is another.
If the panels are still solid, secure, and structurally sound, restoration with the Countryman system may be a very good option.
If you can see daylight through the metal, our coating is not going to negotiate with it.
Replace the failed section first.
Look for:
- Rust-through
- Thin or weakened panels
- Loose or missing fasteners
- Open seams
- Failed flashing
- Damaged penetrations
- Significant deck movement
- Areas that feel unsafe underfoot
Our silicone protects a sound roof.
It does not rebuild one.
Can You Coat a Rusty Metal Roof?
Usually, yes, provided the rust has not compromised the metal itself.
This is where people tend to overreact in both directions.
One group sees a little rust and immediately wants a new roof.
The other group sees a hole big enough to lose a wrench through and reaches for a roller.
The answer is somewhere in between. Light or moderate surface corrosion can often be cleaned, stabilized, and restored.
Before coating rust, however, we recommend using our Rust Buster primer anywhere rust is present, especially when corrosion is active, flaking, or more than superficial.
The goal is not to make the rust look prettier - it's to stabilize the surface and slow the rust down to the point that it's not an issue.
If the panel has lost structural integrity, replacement comes first.
Clean Metal Matters More Than Shiny Metal
A metal roof does not need to look new before coating. But it does need to be clean.
That means removing:
- Dirt
- Dust
- Loose oxidation
- Chalking
- Moss or biological growth
- Grease
- Loose paint
- Flaking rust
- Failed coating
- Debris sitting in laps or around fasteners
Pressure washing is usually the fastest method on larger building roofs when the roof construction allows it.
On smaller roofs or areas that should not be aggressively pressure washed, scrubbing and rinsing may be more appropriate.
Do not overcomplicate this part. The goal is simple:
You want Countryman silicone bonded to the roof.
Not the dirt sitting on top of it.
Pay Attention to Horizontal Seams
On exposed-fastener metal roofs, horizontal panel overlaps are one of the most important areas to inspect.
Why?
Because water running down the roof crosses those seams.
If the seam opens, moves, or traps water, it can become a leak point.
Horizontal seams should usually be reinforced with our Heavy-Duty Silicone before Silicone Top Coat is applied.
Vertical standing seams are different.
They generally shed water along the roof slope and often do not need the same level of reinforcement unless they are damaged, open, or otherwise problematic.
There is no prize for adding material everywhere.
Put the extra material where it earns its keep.
Fasteners Deserve Attention Too
Metal roofs move. Fasteners loosen. Washers dry out.
Sometimes the fastener backs out just enough to become a leak.
Before coating:
- Tighten loose fasteners
- Replace damaged or missing fasteners with a slightly bigger size
- Replace deteriorated washers where necessary
- Inspect enlarged or stripped fastener holes
- Reinforce exposed fastener heads
For exposed-fastener systems, use Countryman Heavy-Duty Silicone over the fastener heads before applying our field coat.
This creates added build around one of the roof's most common leak points.
Penetrations Are Where Roofs Get Interesting
The middle of a metal panel is usually pretty boring. This is not typically where major issue arise from.
The interesting areas are:
- Pipes
- Vents
- HVAC curbs
- Skylights
- Roof edges
- Flashings
- Transitions
- Old repair areas
These are the places where movement, water, and several different materials tend to meet.
They should be inspected carefully and reinforced as needed before the entire roof is coated.
We also use Countryman Heavy-Duty Silicone for this type of detail work.
It is thicker than our field coating, so it can build around seams, fasteners, penetrations, and irregular surfaces without running away from you.
Then Countryman Silicone Top Coat goes over the prepared roof.
Do You Need Primer on a Metal Roof?
Sometimes.
Not always.
Clean, sound, rust-free metal will typically bond very well with our silicone without a primer.
Rusted metal is different.
Other situations may also require primer depending on the existing coating, substrate condition, contamination, or adhesion results.
This is why we recommend an adhesion test before a larger Countryman restoration project.
A small test patch can tell you a lot before you commit to several thousand square feet.
That is considerably cheaper than learning the answer after the coating is installed.
How to Coat a Metal Roof With Countryman Silicone
The exact process depends on the roof, but the basic sequence is usually straightforward.
1. Inspect the Roof
Look for structural damage, rust, loose panels, failed seams, damaged fasteners, penetrations, and drainage problems.
2. Repair Failed Areas
Replace metal or components that are no longer serviceable.
3. Clean the Roof
Remove dirt, oxidation, loose material, biological growth, and contamination. Let the roof dry completely.
4. Treat Rust Where Needed
Prepare corroded areas and apply Countryman Rust Buster Primer where appropriate.
5. Reinforce Seams and Details
Address:
- Horizontal seams
- Fastener heads
- Penetrations
- Flashings
- Cracks
- Previous repairs
For these areas, we use Countryman Heavy-Duty Silicone.
6. Apply Countryman Silicone Top Coat
Apply our field coating at the required coverage rate and thickness for the roof and restoration system being installed.
Do not stretch the material to cover extra square footage.
A thin coat may look white.
That does not mean it is doing the job it was designed to do. Ensure you are putting on the coating at 220 square feet per 4.75-gallon bucket.
7. Inspect the Finished Roof
Check for:
- Missed areas
- Thin spots
- Pinholes
- Incomplete details
- Exposed fasteners
- Gaps around penetrations
A five-minute walk after the job can save a return trip later.
What About Standing Seam Metal Roofs?
Standing seam roofs can also be excellent candidates for the Countryman restoration system.
They simply require a slightly different approach.
Because many standing seam systems conceal fasteners, there may be fewer exposed fastener heads to reinforce.
However, you still need to inspect:
- Panel seams
- End laps
- Clips and movement areas
- Penetrations
- Flashings
- Curbs
- Rust
- Previous repairs
Do not assume a standing seam roof is maintenance-free just because the fasteners are hidden.
Water is creative.
It will find the weak point eventually.
What About Barns and Agricultural Buildings?
Countryman silicone roof restoration can be especially useful on:
- Pole barns
- Equipment buildings
- Livestock buildings
- Storage buildings
- Workshops
- Garages
These roofs are often large, relatively simple, and expensive to replace.
If the panels are still structurally sound, the Countryman system can preserve a lot of usable metal that would otherwise be removed.
Agricultural buildings can also present unique issues such as interior humidity, condensation, animal gases, and corrosion from the underside.
If corrosion is occurring on the interior side of the metal, our silicone can also be applied to properly prepared interior metal surfaces. The metal should still be structurally sound, clean, dry, and suitable for coating, and proper ventilation and application precautions should always be followed.
Coating can help protect the metal surface, but it does not correct the underlying humidity, condensation, or ventilation issue that caused the corrosion.
Both sides of the roof still matter and silicone will typically offer protection to both sides.
Can You Coat a Metal Trailer Roof?
Absolutely.
The same general principles apply to enclosed trailers, cargo trailers, horse trailers, and similar metal roofs.
Clean the metal. Repair damage. Treat rust.
Reinforce seams and penetrations.
Apply Countryman Silicone Top Coat at the proper thickness.
The biggest difference is simply scale. A trailer roof is smaller and usually sees more movement than a commercial building roof.
If you are working specifically on a trailer, we also have a separate guide covering metal trailer roofs in more detail.
How Long Will Countryman Silicone Last on a Metal Roof?
That depends on:
- Roof condition
- Surface preparation
- Coating thickness
- Detail work
- Climate
- Maintenance
- Foot traffic
- Application quality
When the roof is properly prepared, seams and fasteners are reinforced with Heavy-Duty Silicone, and Top Coat is applied at the recommended coverage rate, 15-20 years of additional service life can be a realistic expectation depending on the roof and conditions.
When Should You Replace the Metal Roof Instead?
There are times when the Countryman system is simply not the right answer.
Replacement should be considered when:
- Panels are rusted through
- The roof is structurally unsafe
- Large sections of metal have lost strength
- Fastener attachment is failing throughout
- The deck or framing is damaged
- Water has caused widespread structural deterioration
- The roof geometry or drainage needs major reconstruction
Trying to save a roof that is already structurally done usually costs more in the long run.
There is no shame in replacing a roof that needs replacing.
The trick is not replacing one that still has plenty of life left.
Final Thoughts
Metal roofs are some of our favorite candidates for Countryman silicone restoration.
They are durable, repairable, and often structurally sound long after the surface starts looking tired.
The key is to separate cosmetic deterioration from real failure.
If the panels are sound, the rust can be controlled, the seams and fasteners can be repaired, and our silicone can achieve good adhesion, there is often no reason to tear off a perfectly usable roof.
Clean it.
Fix the weak spots.
Reinforce the details.
Coat it properly.
Then let the old roof keep doing its job.
If you are not sure whether your metal roof is a good candidate for the Countryman system, contact us. We are happy to help evaluate the roof and point you in the right direction, even if that direction is replacement.