How to Shingle a Roof: A Complete Step-by-Step Guide

Should you shingle your own roof?
Safety first: the part people skip
Tools and materials checklist
Choosing the right shingles
Planning and measuring
Step 1: Strip the old roof (if needed)
Step 2: Inspect and repair the deck
Step 3: Install drip edge and underlayment
Step 4: Set the starter course
Step 5: Lay the first full courses
Step 6: Work up the roof
Step 7: Handle valleys, vents, and flashing
Step 8: Finish the ridge
Costs: DIY vs. hiring a roofer
Common mistakes that cause leaks
Maintenance after installation
FAQs
Conclusion
About the author

Should You Shingle Your Own Roof?

Shingling a roof is one of the most satisfying home projects, and one of the most unforgiving. The technique isn’t complicated. Shingles are laid in overlapping rows, nailed in a consistent pattern, and sealed by the sun’s heat. What makes roofing hard is the physical work, the weather window, and the fact that small mistakes show up as leaks months later.

My honest advice is to match the job to your experience. A low-slope shed or a simple gable garage is a reasonable first project for someone handy, with a helper. A steep, multi-level house roof with dormers and valleys is a different story. If you’re unsure, hire a professional for the complex parts and handle the simple sections yourself, or just use this guide to understand what a roofer should be doing so you can check their work.

Also check your local building department before starting. Many areas require a permit for re-roofing, and some limit the number of shingle layers allowed on a roof.

Safety First: The Part People Skip

Falls are the biggest danger in roofing, and they happen to experienced people too. Treat safety as part of the job, not an extra.

Wear a fall-protection harness anchored to a secure point, especially on roofs steeper than a low pitch. The OSHA fall protection guidance is worth reading before you begin.
Use proper footwear with soft, grippy soles.
Set your ladder correctly: on firm, level ground, extending at least three feet above the roof edge, and tied off at the top.
Never work on a wet, icy, or windy day. Wet shingles and underlayment are slippery.
Avoid the hottest part of the day in summer. Heat exhaustion and burned hands are real problems.
Keep power lines in mind and stay far away from them.
Don’t work alone. Someone should know where you are and be able to call for help.

If the roof is very steep, very high, or you feel uneasy, that’s your signal to hire a pro. No roof is worth an injury.

Tools and Materials Checklist

Gather everything before you start so you aren’t climbing up and down for a forgotten item.

Tools:

Roofing hammer or pneumatic roofing nailer
Utility knife with extra hooked blades
Tape measure and chalk line
Roofing shovel or tear-off fork (for removing old shingles)
Pry bar and magnetic sweeper for nails
Tin snips for flashing
Caulk gun for roofing sealant
Roof brackets or jacks, and a sturdy ladder
Safety harness, rope, and anchor

Materials:

Shingles (plus about 10 percent extra for waste and cuts)
Underlayment (felt or synthetic)
Ice and water shield for eaves and valleys
Starter strip shingles
Drip edge
Roofing nails, typically 1¼-inch galvanized
Flashing for walls, chimneys, and vents
Roofing cement or sealant
Ridge cap shingles
Ridge vent (if your design uses one)

Choosing the Right Shingles

For most homes, asphalt shingles are the standard choice. They’re affordable, widely available, and manageable for DIY installation. Within that category, you’ll usually choose between two types:

3-tab shingles. Flat, uniform, and the cheapest option. They have a shorter lifespan and a simpler look.

Architectural (dimensional) shingles. Thicker, with a layered, textured appearance. They cost more but typically last longer and look better.

For most people, architectural shingles are the better value. Major manufacturers like GAF, Owens Corning, and CertainTeed publish installation instructions for each product line. Read the instructions for the exact shingles you buy, because they affect warranty coverage and nailing requirements.

Also consider your climate. In areas with high winds, look for shingles rated for the wind speeds you may see. In hot regions, lighter-colored shingles can reflect more heat.

Planning and Measuring

Roof area is measured in “squares,” where one square covers 100 square feet. To estimate:

Measure the length and width of each roof section and multiply to get its area.
Add the sections together.
Adjust for slope. Steeper roofs have more surface area than their footprint suggests.
Divide by 100 to get the number of squares.
Add about 10 percent for waste, more if your roof has many valleys or hips.

Most asphalt shingles come in bundles, with about three bundles per square. If you’re unsure, give your supplier the measurements and ask them to check your numbers.

Check the forecast before you start. You want several dry days in a row, with moderate temperatures. Shingles are harder to handle in extreme cold and can scuff or stick in extreme heat.

Step 1: Strip the Old Roof (If Needed)

Some building codes allow a second layer of shingles over an old one, but tearing off the old roof is usually the better choice. It lets you inspect the deck and gives the new shingles a flat, clean surface.

Work from the top down. Use a roofing shovel or tear-off fork to pry up the shingles and nails. Pull or hammer down every old nail. Drop debris into a dumpster or onto a tarp, never onto bare ground where nails can end up in your yard or tires.

Clean up as you go. Use a magnetic sweeper around the house, because stray roofing nails are a common cause of flat tires.

Step 2: Inspect and Repair the Deck

Once the old shingles are off, walk the bare deck carefully and look for problems.

Soft or spongy spots that suggest rot
Dark stains or mold
Warped, cracked, or split boards
Gaps between sheets of plywood or OSB
Loose or popped nails

Replace any damaged sheathing. This is one of the most important steps, because shingles are only as good as what they sit on. Nailing new shingles onto rotten wood is a waste of money. If the damage looks widespread, have a professional evaluate the structure before continuing.

Step 3: Install Drip Edge and Underlayment

Drip edge is metal flashing that directs water away from the fascia and into the gutters. Install it along the eaves first, directly on the deck. On the rake (sloped) edges, install it over the underlayment. This order lets water flow properly.

Ice and water shield goes next in vulnerable areas. This self-adhering membrane protects the lower edge of the roof and valleys in cold climates, where ice dams can push water under shingles. Check local requirements, because some codes require it in certain regions.

Underlayment is the water-resistant layer that covers the rest of the deck. Start at the bottom edge and roll it horizontally, overlapping each course over the one below by the amount the manufacturer specifies. Fasten with cap nails or staples, and keep it flat and wrinkle-free.

Synthetic underlayment is stronger and easier to walk on than traditional felt, though it costs more. Either is acceptable if installed correctly.

Step 4: Set the Starter Course

The starter course is the foundation of a good roof. It seals the lower edge of the first row of shingles and helps prevent wind from lifting them.

Use dedicated starter strips if you can. Install them along the eaves with the adhesive strip near the edge, overhanging the drip edge by about half an inch to three-quarters of an inch, according to your manufacturer’s guidance. If you don’t have starter strips, you can cut tabs off regular shingles, but check the manufacturer’s recommendations because it can affect warranty coverage.

Nail according to the instructions, usually placing nails just above the adhesive line and well away from the edge.

Step 5: Lay the First Full Courses

Snap a horizontal chalk line to guide your first course. Then lay your first row of full shingles directly over the starter strip, aligning them with the line. Make sure the cutouts, or tabs, are placed according to the manufacturer’s pattern.

Nailing pattern matters. Most manufacturers call for four nails per shingle in normal conditions, and six in steep or high-wind situations. Place nails in the nailing zone marked on the shingle, driving them straight and flush with the surface. Nails that are driven too deep tear through the shingle, and nails left too high won’t hold properly.

If you’re using a pneumatic nailer, set the pressure carefully and test on scrap first. Overdriven nails are a very common mistake with nail guns.

Step 6: Work Up the Roof

Continue laying courses from the bottom up, staggering the seams so that vertical joints don’t line up from one row to the next. Most shingles have a recommended offset pattern, which is typically a set number of inches.

A few habits will keep the work clean:

Snap chalk lines every few courses so the rows stay straight.
Blend bundles. Shingles from different bundles can vary slightly in color, so mixing them as you go avoids visible patches.
Keep your weight distributed. Use roof brackets on steeper slopes, and avoid stacking too many bundles in one spot.
Don’t rush. Straight courses and consistent nailing are far more important than speed.

At the end of each work session, make sure nothing is left loose that could blow off. Wind can lift unsealed shingles, and unfinished sections should be protected if rain is possible.

Step 7: Handle Valleys, Vents, and Flashing

This is where most leaks start, so slow down.

Valleys. Where two roof slopes meet, you have two options. In an open valley, metal flashing is installed and shingles are trimmed back to expose it. In a closed valley, shingles from one side overlap the valley and are cut and trimmed on the other. Both work if done correctly, and your manufacturer’s instructions will say which method is approved for your shingles.

Vent pipes. Slide pipe flashing over the pipe and under the shingles above it, but over the shingles below it. Seal the edges lightly where appropriate.

Chimneys and walls. These need step flashing and counter-flashing, where each shingle course gets its own piece of flashing woven in. This is a skilled job, and it’s one of the best places to bring in a professional if you aren’t confident.

Skylights and unusual details. Use the flashing kit that matches your skylight, and follow the kit instructions exactly.

Avoid relying on roofing cement as a primary waterproofing method. It’s useful as a supplement, but it dries out and cracks over time. Proper flashing is the real protection.

Step 8: Finish the Ridge

The ridge is the peak of the roof, and it needs a special cap to seal the top edge.

Ridge vent (if your roof design uses one) is installed first. Cut an opening along the peak according to the manufacturer’s directions, then install the vent over it. Good ventilation helps prevent moisture buildup and can extend the life of your shingles. The Asphalt Roofing Manufacturers Association has helpful guidance on ventilation and installation.

Ridge cap shingles are laid over the peak, starting at the end that faces away from the prevailing wind, so wind doesn’t blow under the overlaps. Nail them with longer nails to reach through the layers, covering the nails on each cap with the next piece.

Finish by sealing exposed nail heads in vulnerable areas with a small dab of roofing sealant. Then clean up thoroughly, including gutters, which often fill with granules and debris.

Costs: DIY vs. Hiring a Roofer

Prices vary a lot by region, roof size, and material, so treat these as planning ranges.

Item	Typical range (USD)	Notes
Asphalt shingles (materials only)	$100 – $200+ per square	Varies by quality and brand
Underlayment, flashing, nails, and accessories	$50 – $150 per square	Depends on complexity
Dumpster rental for tear-off	$300 – $600+	Size and local rates matter
Tool purchase or rental	$50 – $400	Harness and nailer add up
Professional roof replacement (average home)	$6,000 – $15,000+	Depends heavily on region, size, and pitch
Permit fees	$50 – $500	Varies by municipality

DIY can save a significant share of the labor cost, but only if you do it correctly. A poorly installed roof leads to repairs that can cost more than hiring a professional in the first place. Many manufacturer warranties also require professional installation for full coverage, so check before you start.

If you hire out, get at least three written quotes and ask about insurance, licensing, warranty terms, and how they handle tear-off and cleanup.

Common Mistakes That Cause Leaks

Nailing too high or too low. Incorrect nail placement is a leading cause of blow-offs.
Overdriving nails. Nails sunk too deep weaken the shingle.
Ignoring the manufacturer’s instructions. Warranties depend on following them.
Poor flashing work. Leaks at chimneys, vents, and valleys are extremely common.
Skipping the underlayment or installing it wrinkled. It’s your backup layer of protection.
Misaligned courses. Crooked rows look sloppy and can affect water flow.
Working in bad weather. Cold, wet, or very hot conditions hurt both safety and installation quality.
Not accounting for ventilation. Poor airflow shortens the life of your roof.

Maintenance After Installation

A new roof still needs regular attention.

Inspect it twice a year, in spring and fall, and after any major storm.
Keep gutters clear so water can drain properly.
Trim overhanging branches, which can scrape shingles and drop debris.
Watch for moss and algae, especially in shaded or humid areas.
Check for lifted, cracked, or missing shingles and repair them promptly.
Look in the attic for daylight, stains, or dampness, which can indicate leaks.

Small repairs done early cost very little compared to the damage a slow leak can cause.

FAQs

Can I shingle a roof myself?
You can, if you’re comfortable with heights, have a helper, and are willing to follow instructions carefully. Complex roofs or steep pitches are better handled by professionals.

How long does it take to shingle a roof?
A small, simple roof might take a weekend with two people. A full-sized house can take several days, depending on weather, pitch, and experience.

Do I need to remove old shingles first?
Often yes. Some codes allow a second layer, but tearing off the old roof lets you inspect and repair the deck, and typically produces a better, longer-lasting result.

How many nails go in each shingle?
Most manufacturers call for four nails per shingle in normal conditions and six in high-wind or steep-slope situations. Always follow the instructions for your specific product.

How long do asphalt shingles last?
Lifespans vary by product and climate. Many last roughly 15 to 30 years with proper installation and maintenance.

What’s the best time of year to shingle a roof?
Mild, dry weather is ideal, which is often spring or early fall in many regions. Avoid extreme heat, cold, and rain.

Do I need a permit?
Many areas do require one for re-roofing. Check with your local building department before you start.

Should I use roofing cement on everything?
No. It’s a helpful supplement but not a substitute for proper flashing and good installation.

Conclusion

Shingling a roof isn’t a mystery, but it does reward patience and preparation. The roofs that last are rarely the ones built fastest. They’re the ones where someone checked the deck, flashed every penetration properly, nailed in the right zone, and followed the manufacturer’s instructions even when it felt tedious.

If you’re going to do it yourself, start small, put safety above speed, and be honest about where your skills end. Doing the straightforward sections yourself and hiring a pro for the tricky flashing or steep sections is a perfectly reasonable middle path. In the end, a roof is one of those parts of a house you only notice when something goes wrong, and the best result is a roof you forget about for the next twenty years.

About the Author

The author is a home-improvement researcher and writer who studies residential building products, roofing systems, and practical renovation decisions. Their work focuses on turning technical product information into clear guidance for homeowners, comparing real costs, tradeoffs, and long-term performance. They regularly review installation methods and manufacturer documentation to help readers avoid expensive mistakes.