The Longevity of Slate Roofs
A properly installed and maintained slate roof can last 100-150 years or more. Many slate roofs on DMV-area homes are original installations from the late 19th and early 20th centuries. With proper care, they can continue to protect your home for decades to come.
Types of Slate Used in Historic DMV Homes
Common Slate Roof Problems
Individual Broken Slates
Individual slates can be replaced without disturbing the rest of the roof. A skilled slater uses a specialized tool called a "ripper" to remove the nails, then slides the new slate into position secured by a copper or lead nail strip.
Flashing Failures
Most slate roof leaks occur at flashing points—chimneys, valleys, and dormers. Copper flashing is the traditional and most durable material. Replacing failed flashing with copper is always the right choice for historic slate roofs.
Worn or Degraded Slates
As slate ages, some varieties begin to delaminate or become porous. Regular inspection can identify slates that need replacement before they fail.
Finding a Qualified Slate Roofer
Slate roofing is a specialty trade. When evaluating contractors:
The Economics of Slate Roof Repair
Repairing a historic slate roof is almost always more economical than replacement, especially when many of the slates are in good condition. A good slate roofer can assess your roof and tell you honestly whether repair or replacement makes sense.