Regarding residential roofing, asphalt shingle installation is one of the most common and cost-effective methods available. Known for its durability, affordability, and ease of application, asphalt shingles are a top choice for homeowners across various climates.
Whether you’re a seasoned contractor or a handy homeowner, understanding the proper steps and materials involved in asphalt shingle installation is key to a long-lasting roof. To help you execute the work correctly, in this article, C&R Roofing will break down each step of the installation process.
Step 1: Roof Deck Preparation
A sturdy and clean base is necessary before any shingles are laid. This starts with roof deck preparation.
What to Do:
- Inspect the decking (usually plywood or OSB) for rot, mold, or soft spots.
- Replace any damaged sections.
- Ensure the surface is smooth and debris-free.
A properly prepared deck guarantees the shingle system’s lifespan and appropriate adherence.
Step 2: Drip Edge Installation
Next, install the drip edge along the eaves and rakes. This metal flashing prevents water from wicking into the wood deck and protects the edges from rot.
How to Install:
- Before installing underlayment, nail drip edge flashing to the roof’s edges.
- Overlap sections by 1-2 inches.
- Secure with roofing nails every 8 to 10 inches.
Proper drip edge installation ensures water flows off the roof and not into vulnerable areas.
Step 3: Apply Ice and Water Shield
Applying an ice and water barrier is essential in colder climates to stop water intrusion and ice dams.
Where to Apply:
- Along roof penetrations (vents, chimneys), along valleys, and eaves.
- Inside the warm wall line, extend for at least 24 inches.
This self-adhesive underlayment acts as a waterproof barrier in high-risk zones.
Step 4: Lay Roofing Underlayment
On the remaining deck, roll out synthetic or felt underlayment to provide an extra layer of moisture protection.
Tips:
- Each row should overlap by at least 4 inches.
- Use cap nails or staples to secure.
- Steer clear of creases since they could be interpreted as shingles.
Step 5: Starter Strip Shingles
Installing starter strip shingles along the eaves is vital to secure the first course of shingles and prevent wind uplift.
What They Do:
- Provide a sticky edge for the first row to bond with.
- Protect the margins of your roof from wind and water damage.
Use manufacturer-provided starter strips or cut 3-tab shingles for a budget option.
Step 6: Asphalt Shingle Installation
Now comes the core step—asphalt shingle installation.
Basic Method:
- Begin from the bottom corner and work across in rows.
- Use a shingle layering technique, overlapping each row as you move upward.
- Follow a nail pattern for shingles: typically four to six nails per shingle, driven just below the adhesive strip.
Tips:
- Align shingles with a chalk line.
- Stagger joints to prevent water infiltration.
- Don’t overdrive nails or leave them sticking up.
The correct shingle layering technique and nail pattern for shingles are critical to roof performance and warranty coverage.
Step 7: Flashing Installation
Installing flashing is necessary to seal connections and stop leaks around walls, skylights, valleys, and chimneys.
Common Types:
- Step flashing for walls
- Valley flashing for roof intersections
- Chimney flashing kits
Always embed flashing in roofing cement for extra waterproofing.
Step 8: Ridge Cap Shingles
Once the field shingles are in place, finish the roof with ridge cap shingles.
Why They Matter:
- Protect roof peaks from wind and water.
- Allow for attic ventilation in ridge vent systems.
- Add a finished, professional appearance.
Ridge caps are usually thicker and pre-cut to fit over roof ridges. Install with nails and ensure they overlap properly with no gaps.
Final Inspection
After completing the asphalt shingle installation, inspect your work thoroughly:
- Ensure shingles are flat and secure.
- Check flashing for proper placement.
- Look for exposed nails and cover with roofing sealant if needed.
Proper inspection ensures your roof is weatherproof and ready to endure the elements.
FAQs About Asphalt Shingle Installation
Q1: How long does asphalt shingle installation take?
Depending on the size, intricacy, and weather of the roof, it usually takes one to three days.
Q2: Can I install asphalt shingles myself?
Yes, if you’re experienced with roofing tools and safety. However, hiring a pro is advised for larger or steep-slope roofs.
Q3: How long do asphalt shingles last?
Most shingles last 20–30 years, with premium versions lasting even longer.
Q4: Do I need to remove the old roof before installing shingles?
While overlaying is possible, removing the old roof is best for durability and inspection.
Q5: What is the cost of asphalt shingle installation?
Costs range from $3.50 to $5.50 per square foot installed, depending on materials and labor.