How to Reshingle a Roof (The Right Way)

When a homeowner receives a terrifying $15,000 estimate from a professional roofing contractor, they often look up at their single-story home and think, “It’s just nailing down heavy paper. I can do this myself.” While learning how to reshingle a roof is technically straightforward, the physical execution is incredibly dangerous, massively exhausting, and completely unforgiving. A single misplaced nail or incorrectly installed flashing will cause a catastrophic leak that rots the interior framing of your house. Before you buy 30 heavy bundles of asphalt, you must understand the massive, step-by-step reality of a full roof replacement.

Before you start aggressively loading heavy pallets of asphalt into the back of your truck, you absolutely must know your exact total square footage. Use our Free Roofing Calculator right now to compute your exact roof dimensions and generate a mathematically flawless material order in seconds.

Table of Contents

1. The Massive Danger of “Re-Roofing” (Do Not Do This)
2. Step 1: The Brutal Tear-Off and Deck Prep
3. Step 2: The Waterproofing (Drip Edge and Ice Shield)
4. Step 3: Nailing the Shingles (The Strike Zone)
5. Conclusion: Hire a Professional
6. Frequently Asked Questions

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The Massive Danger of “Re-Roofing” (Do Not Do This)

The absolute biggest mistake DIY homeowners make when learning how to reshingle a roof is attempting a “Re-Roof” (also called a “layover”).

• A layover involves simply nailing the brand new shingles directly on top of the old, failing shingles to save the massive labor of tearing them off.
• The Trap: While legally allowed in some building codes, it is a catastrophic architectural mistake. First, old shingles are warped and jagged; the new shingles will mold to these bumps and look terrible. Second, you are adding roughly 5,000 pounds of massive, unnecessary structural weight to your roof trusses. Third, leaving the old roof completely hides any rotting plywood underneath. You will literally be nailing a new roof onto rotting wood.
• You must commit to a full tear-off down to the bare wooden deck.

Step 1: The Brutal Tear-Off and Deck Prep

A full roof replacement is 40% demolition and 60% installation.

• You must rent a massive dumpster and use heavy roofing shovels to violently rip up thousands of pounds of old asphalt, nails, and underlayment. It is exhausting, back-breaking labor.
• Once you reach the bare plywood deck, you must inspect every single sheet of wood. If the wood is black, soft, or rotting from a previous leak, you must cut out the rotten wood and screw down brand new sheets of CDX plywood. If you nail a new roof to rotten wood, a hurricane will rip the entire roof off the house.

Step 2: The Waterproofing (Drip Edge and Ice Shield)

The asphalt shingles are only the top layer of defense. The true waterproofing happens underneath.

• Drip Edge: You must install heavy metal drip edge flashing along the entire perimeter (eaves and rakes) to prevent water from wicking backward into the fascia boards and rotting them.
• Ice & Water Shield: You must roll out a heavy, rubberized, peel-and-stick membrane (Ice and Water Shield) heavily in the valleys (where two roof planes meet) and along the bottom edge of the roof. This self-sealing rubber prevents massive leaks caused by winter ice dams or heavy rain in the valleys.
• Synthetic Underlayment: Finally, you cover the rest of the bare wood with a heavy-duty synthetic roofing felt to provide a final waterproof barrier.

Step 3: Nailing the Shingles (The Strike Zone)

Once the waterproofing is flawless, you install the starter strip along the bottom edge, and then begin aggressively nailing the architectural shingles.

• The Nailing Zone: This is where amateurs fail entirely. Every shingle has a highly specific “nailing line” or “strike zone” printed across the middle. You must drive exactly four (or six in high wind zones) galvanized roofing nails perfectly into this narrow line.
• High Nailing: If you nail too high (above the line), you miss the underlying shingle, and the wind will violently rip the shingle off in the first storm.
• Over-Driven Nails: If you set the air pressure on your pneumatic nail gun too high, the nail head will violently punch completely through the fiberglass mat, completely destroying the holding power. The nail head must sit perfectly flush with the asphalt.

Conclusion: Hire a Professional

While watching a 10-minute video on how to reshingle a roof makes the process look easy, the brutal reality involves hauling 9,000 pounds of material up a 20-foot ladder, walking on a highly dangerous slope, and executing flawless flashing details around chimneys and pipes. A single mistake on a pipe boot flashing will cause a massive leak that ruins your drywall. Unless you have extensive construction experience, hiring a highly insured, professional roofing crew is the absolute smartest financial and physical decision you can make.

If you decide to hire a professional, you must verify the exact square footage of your roof to ensure their estimate is mathematically honest. Head over to our Free Roofing Calculator right now. By inputting your home’s basic dimensions, the tool will instantly output your exact total square footage, giving you the flawless baseline data required to negotiate safely.

Related Guides

• How Many Square Feet in a Bundle of Shingles?
• How Much is a Pallet of Shingles?

Frequently Asked Questions

Do I need a permit to reshingle my roof?

In almost every major city and municipality in the United States, yes. A full roof tear-off and replacement is a massive structural alteration. You must pull a building permit, and a city inspector must often verify the condition of the bare wood deck and the nailing pattern before signing off on the job. If you skip the permit, you may face massive fines or be forced to tear off the new roof.

How long does it take to reshingle a roof?

A highly trained, professional roofing crew of 5 to 6 men can completely tear off and replace a standard 2,500 square foot asphalt roof in a single day (roughly 8 to 10 hours). If you attempt this as a solo DIY homeowner working on the weekends, it will likely take you 2 to 3 agonizing weeks, during which your roof is highly vulnerable to sudden rainstorms.

What do I do around the chimney?

The chimney is the number one source of massive roof leaks. You cannot just run shingles up to the brick and cover it in caulk. You must install highly complex metal “step flashing” interlaced with every single shingle, and then cut a deep groove into the brick to install metal “counter-flashing” over the top. It requires specialized masonry saws and sheet metal brakes.