Common Slate Roofing Issues and How to Fix Them

Slate roofs are timeless. Their natural beauty, durability, and resistance to fire make them a favorite among homeowners seeking elegance with longevity. But even the sturdiest roofs aren’t immune to wear. Over time, slate can crack, shift, or show signs of trouble that, if ignored, lead to costly repairs.

In this post, we’ll explore the most common issues with slate roofing and how to tackle them—whether through DIY vigilance or calling in the pros.

1. Cracked or Broken Slate Tiles

This is one of the most frequent slate roof problems. Slate is a rock, after all—strong but brittle. A falling branch, foot traffic, or just years of exposure to the elements can cause individual tiles to crack or break.

What to look for:

• Visibly broken or missing tiles
• Water spots inside the attic
• Small debris in gutters that resemble broken slate

Fix it:
A single cracked tile can often be replaced without disturbing the surrounding slate. The damaged piece is carefully removed and swapped with a new one, using a “nail and bib” method to avoid loosening nearby tiles. It’s delicate work—often best left to a professional roofer.

2. Slate Tile Slippage

Sometimes, slate tiles don't break—they slide out of place. This can happen when nails holding the tiles corrode or when the wooden sheathing underneath begins to decay.

What to look for:

• Gaps or uneven rows of slate
• Tiles collecting in the gutters or around your property
• Water streaks on interior walls or ceilings

Fix it:
Slipped tiles usually require reinstalling or replacing the fasteners. If the sheathing is rotted, it may need to be patched or replaced as well. A qualified roofing contractor in Oneonta AL can assess the situation and ensure the fix won’t compromise your roof’s integrity.

3. Leaks Around Flashing

Flashing—usually made of metal—protects vulnerable areas like chimneys, valleys, and skylights. When it fails, even a solid slate roof can leak.

What to look for:

• Water stains around the chimney or vent pipes
• Deteriorated or visibly rusted flashing
• Damp insulation or wood beneath the flashing

Fix it:
Fixing flashing typically involves lifting the surrounding tiles, removing the old metal, and carefully installing new flashing. Matching the color and patina of the surrounding materials can make the repair nearly invisible. It's not something to DIY unless you have roofing experience.

4. Nail Fatigue and Corrosion

Even if your slate is still going strong after 80 years, the nails holding them in place may not be. Older roofs often used iron nails, which rust over time and loosen their grip.

What to look for:

• Loose or wobbly slate tiles
• Tiles falling without any apparent damage
• Discoloration or staining around nail points

Fix it:
This problem usually signals that the roof needs partial or full re-nailing. It’s a big job—but not a roof replacement. A skilled contractor can preserve the good slates while upgrading the fasteners for decades more performance.

Case Study: A Historic Home Saved by Timely Repairs

When the Collins family bought their 1920s home in Oneonta, they loved the character of the original slate roof—but leaks had started showing up in the guest bedroom. They called Royal Roof Contractors LLC for an inspection. The team identified corroded flashing and about a dozen slipped tiles. Instead of replacing the entire roof, targeted roof repairs fixed the issue within two days—preserving the historic look and saving thousands in replacement costs.

Final Thoughts: Don’t Wait for Small Issues to Become Big Ones

Slate roofs can last over a century, but only with the right care. Routine inspections and small repairs can prevent huge headaches down the road. If you’re unsure about the condition of your roof—or just haven’t had it checked in a while—now’s a good time to call in a pro.

Need help? Contact a trusted slate roofing specialist for an honest assessment and peace of mind.