A slate roof is a fulfilling project that has withstood the test of time, giving your house everlasting beauty and amazing durability. How to install slate roof? This guide will take you through the steps you will need to follow and the pitfalls to avoid so that you can see how the process works and whether you should go ahead and do it yourself or employ a skilled roofer.
Tools & Materials
| Item | Why you need it |
| Natural or synthetic slate tiles | The roofing material |
| Stainless steel or copper nails | Corrosion-resistant fasteners |
| Underlayment (felt or synthetic) | Water barrier beneath slates |
| Flashing (copper/lead) | Seal penetrations and valleys |
| Slate ripper & slate cutter | Remove and trim slates |
| Chalk line, tape measure | Layout and alignment |
| Safety harness & roof anchors | Fall protection |
Step-by-step: How to Install Slate Roof
1. Inspect structure and plan
Slate is heavy. Before you learn how to install slate roof, confirm that your roof framing supports the load (often 3–4 times heavier than shingles). Reinforce rafters or rafters plus sheathing if needed. Decide slate size, exposure, and coursing pattern. Check out our Roofing Installation Services here!
2. Install underlayment and starter course
Install a good under-layment or ice-and-water shield, particularly at eaves and valleys. Begin with a firm foundation; starter slates are usually nailed a little differently, thus the first complete course fits.
3. Lay and fasten slates
Work from the eave upward. Mark courses with a chalk line. Each slate is typically nailed with two corrosion-resistant nails just above the exposure line; lift the slate above and slide the next slate under the headlap. Maintain consistent exposure (how much slate shows) for a uniform look and proper water shedding. Get the best Roof Replacement service here!
4. Flash valleys, chimneys, and vents
Proper flashing is crucial. Use copper or lead flashings for durability; step-flash chimneys and counter-flash where possible. Valleys often perform best with open metal or interlaced slate techniques, depending on local code and climate.
5. Finish ridge and hips
Ridge caps can be made from specially cut slates or metal ridge caps. Secure them so wind won’t lift them, and ensure ventilation if your design requires it.
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Common Mistakes to Avoid
- Using ordinary nails.
- Incorrect exposure or uneven coursing.
- Skipping structural reinforcement for heavy slate.
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The Bottom Line
How to install slate roof? The installation of a slate roof requires planning, proper materials, and observing safety. When properly installed, slate can last tens of years, whereas due to weight, tech specifications (flashing, nail choice, coursing), most homeowners would hire a professional to install their slate roof. To get more roofing advice, go to RoofFixer!
