How to Reroof a House: Step-by-Step DIY Guide
Thinking about tackling a roofing project yourself? Whether you’re trying to save money, extend your roof’s life, or just love a good DIY challenge, learning how to reroof a house can be one of the most rewarding home improvement projects — if done right.
As a roofing contractor with over 30 years in the field, I’ve seen thousands of roofs — the good, the bad, and the downright dangerous. This guide walks you through exactly what it takes to remove your old shingles and install a new roof like a pro.
What Does “Reroofing” Mean?
Reroofing is the process of replacing all or part of your roofing system. This usually involves tearing off the existing shingles and underlayment, inspecting the decking, and installing brand-new roofing materials — including underlayment, drip edge, shingles, flashing, and ventilation.
There’s a big difference between a “roof overlay” and a “complete reroof.” For this guide, we’re covering the full tear-off and reroofing process, which gives you the most durable and long-lasting results.
Is Reroofing a House a Good DIY Project?
If you’re comfortable with ladders, basic carpentry, and working in the sun, and you have a solid weekend (or two) to spare — yes.
If you’re scared of heights, unfamiliar with tools, or unsure how to walk safely on a roof — call a professional. No savings are worth a hospital visit.
Roofing Tools & Materials You’ll Need
Before we jump into how to reroof a house, here’s your basic checklist:
Tools:
- Roofing nailer or hammer
- Pry bar
- Utility knife
- Chalk line
- Roofing shovel or tear-off bar
- Ladder and fall protection gear
- Measuring tape and framing square
Roofing Materials:
- Roofing shingles (asphalt, metal, or your preferred type)
- Ice and water shield
- Synthetic or felt underlayment
- Roofing nails
- Drip edge
- Flashing
- Ridge vent or roof ventilation system
- Roof cement or sealant
Gathering Necessary Permits and Materials
Permits:
Before starting, consult your local building department to determine if a permit is required for reroofing. Compliance with local codes ensures safety and legality.
Materials and Tools:
| Materials | Tools |
|---|---|
| Asphalt shingles | Roofing nail gun or hammer |
| Roofing underlayment | Pry bar |
| Drip edge | Utility knife |
| Flashing | Chalk line |
| Roofing nails | Ladder and scaffolding |
| Sealant | Safety harness and gear |
Ensure all materials meet local building codes and manufacturer specifications.
Safety Precautions
Working on a roof poses significant risks. Prioritize safety by:
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Using Proper Gear: Wear non-slip shoes, gloves, and a safety harness.
-
Weather Conditions: Avoid working in wet or windy conditions.
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Ladder Safety: Ensure ladders are stable and placed on level ground.
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Debris Management: Keep the work area clean to prevent tripping hazards.
Remember, safety should never be compromised.
Step-by-Step: How to Reroof a House
1. Remove the Old Roofing
Use a roofing shovel or pry bar to tear off old shingles, nails, and underlayment. Start at the top ridge and work your way down. Be cautious — nails and debris will fly.
Pro Tip: Use tarps on the ground to catch debris and protect landscaping.
- Inspect the Roof Decking
After everything’s off, walk the surface to check for soft spots or water damage. Replace any rotted or weak plywood sections before moving forward.
- Install Ice & Water Shield
Lay ice and water shield along all eaves, valleys, and any areas prone to leaks. This self-adhering barrier prevents water from penetrating beneath your shingles.
- Install Underlayment
Roll out your synthetic roofing underlayment, overlapping each row by at least 4 inches. Staple or nail it in place. This is your secondary moisture barrier.
- Apply Drip Edge
Install metal drip edge flashing along all eaves and rakes. This directs water into the gutters and protects the wood beneath.
- Lay Starter Shingles
At the bottom edge of your roof, install a starter strip or starter shingles. These help secure the first row of shingles and seal against wind uplift.
- Install Shingles
Follow the manufacturer’s pattern and nail down shingles using proper spacing. Work your way across and up the roof, staggering the seams.
Tip: Make sure nails are placed just above the shingle cut-out and never overdriven.
- Flash Valleys, Vents & Chimneys
Use metal flashing around all penetrations and in roof valleys. This prevents leaks in critical areas. Seal with roofing cement as needed.
- Install Ridge Cap Shingles
Once both sides are complete, cap the ridge using pre-bent ridge cap shingles. This final step seals the peak and adds ventilation.
Common Mistakes to Avoid
- Skipping underlayment or ice & water shield
- Improper nailing pattern or overdriven nails
- Reusing old flashing or vents
- Ignoring attic ventilation
- Reroofing in bad weather
Should You Hire a Roofing Contractor?
If this all sounds overwhelming, it’s because it is. Roofing is hot, hard, and potentially dangerous work. Hiring a licensed roofing contractor can save you headaches, time, and costly mistakes — especially if you live in an area with strict building codes or harsh weather.
Final Thoughts: Is DIY Reroofing Worth It?
Reroofing a house isn’t just about replacing shingles — it’s about protecting your home for the next 20–30 years. If you’ve got the skills and the patience, it can be done. Just follow this guide step by step, work safely, and don’t cut corners.
FAQs: How to Reroof a House
How long does it take to reroof a house?
For an average-size home, DIY reroofing takes 2–5 days, depending on experience, weather, and complexity.
Can I put new shingles over old ones?
Technically yes, but it’s not recommended. A tear-off gives you a clean slate and better long-term performance.
Do I need a permit to reroof my house?
Yes, most cities require a building permit for reroofing. Always check with your local building department.
What is the best roofing material for DIY?
Asphalt shingles are the most beginner-friendly due to affordability and ease of installation.
Ready to Reroof Like a Pro?
If you’ve read this far, you’re already miles ahead. Bookmark this guide and take it one step at a time — or better yet, call a pro for an estimate and compare your options.
Need help? At Pro Craft Home Products, we’ve been helping Toledo homeowners reroof their homes right — the first time — for over 30 years.
