Signs Your Metal Roof Needs Re-Sealing — Expert Tips from Professional Roofing Contractors
A metal roof is one of the most durable and weather-resistant roofing options available. However, even the toughest metal roofs need maintenance from time to time — especially when it comes to re-sealing. Over the years, constant exposure to sun, wind, rain, and temperature changes can cause the roof sealant to wear down, leading to leaks and corrosion if left untreated.
In this guide, we’ll walk you through the key signs that your metal roof needs re-sealing, why it’s so important, and how much you can expect to pay for this essential maintenance service.
Why Metal Roof Sealing Matters
Metal roof sealant acts as a protective barrier between your roofing panels and the elements. It helps prevent water from seeping into seams, fasteners, and flashing — all of which are potential entry points for moisture.
Without regular re-sealing, your roof becomes vulnerable to:
Leaks and water damage
Rust and corrosion
Reduced energy efficiency
Shortened roof lifespan
By re-sealing your roof on time, you can extend its life, maintain its appearance, and avoid costly repairs later on.
Common Signs Your Metal Roof Needs Re-Sealing
1. Leaks or Water Stains Inside Your Home
If you notice damp spots, water stains, or peeling paint on your ceilings or walls, your roof’s sealant may have failed. This is a clear indicator that water is finding its way through weakened seals.
2. Visible Rust or Corrosion
Sealants protect your metal roof from oxidation. Once the coating wears off, moisture and air can react with the metal, leading to rust. If you see reddish-brown patches or corrosion around seams or screws, it’s time to re-seal.
3. Cracked or Worn Sealant
Inspect your roof regularly for cracking, peeling, or missing sections of sealant. UV rays and temperature fluctuations can cause sealant to dry out and deteriorate over time.
4. Loose or Damaged Fasteners
Fasteners (screws or bolts) expand and contract with temperature changes, which can loosen the seals around them. This creates small gaps that allow water to enter.
If you notice any loose or rusted screws, have a professional inspect and re-seal the area.
5. Fading Paint or Coating
When your roof starts looking dull or faded, it may not just be cosmetic. It often signals that the protective layer has worn thin and needs resealing to prevent further UV and water damage.
6. Increased Energy Bills
A compromised seal can reduce your roof’s reflective properties, allowing heat to enter your home more easily. If your energy costs suddenly rise, poor sealing might be a hidden culprit.
How Often Should You Re-Seal a Metal Roof
Most experts recommend re-sealing your metal roof every 10–15 years, depending on your location, weather conditions, and the type of coating used. However, in coastal or high-rainfall regions, more frequent maintenance may be needed to prevent salt or moisture damage.
Benefits of Professional Metal Roof Re-Sealing
Hiring a professional roofing company guarantees that:
Every seam, joint, and fastener is properly sealed
The correct sealant type is applied for your roof material
Surface preparation (cleaning, rust removal, primer) is done correctly
Your roof’s warranty remains valid
Professional re-sealing not only enhances performance but also maintains your roof’s appearance and resale value.
Final Thoughts
Re-sealing your metal roof is a simple but crucial part of maintaining its integrity and performance. Ignoring small signs like rust or leaks can lead to costly repairs down the road.
If you’ve noticed any of the warning signs above — or it’s been over a decade since your last seal — it’s time to contact your local roofing experts for an inspection and re-sealing quote.
A well-maintained metal roof can last 40–70 years, and re-sealing is one of the best ways to keep it performing like new.
Need professional metal roof maintenance or re-sealing?
Get in touch with Hinterland Metal Roofing, your trusted Roofing Contractors in metal roofing solutions across Northern Rivers — including Alstonville, Ballina, Bangalow, Casino, Goonellabah, and Lismore.
Protect your roof today — and enjoy peace of mind for years to come.