Roofing a house is a major home improvement project that requires careful planning, proper materials, and attention to detail. A properly installed roof helps protect the home from rain, wind, moisture, and other weather conditions.
If you are wondering how to roof a house in Maine, the process generally involves removing the old roofing, inspecting the roof deck, installing protective layers, adding flashing and starter shingles, and then installing the shingles according to the manufacturer’s instructions.
For safety and code compliance, homeowners should consider hiring a qualified roofing professional, especially for steep, complex, or large roofs.
1. Prepare the Roof and Safety Equipment
Before starting, make sure you have the necessary tools, materials, and fall-protection equipment.
Common roofing tools include:
- Roofing shovel
- Hammer or pry bar
- Roofing nails
- Nail gun
- Utility knife
- Measuring tape
- Ladder
- Chalk line
- Roofing materials
- Underlayment
- Ice and water protection
- Drip edge
- Starter shingles
- Field shingles
- Ridge shingles or ridge-cap materials
The supplied roofing guide starts the tear-off process with a roofing shovel designed to remove shingles and pull nails.
2. Remove the Old Shingles
The first major step in reroofing is removing the existing shingles.
Start near the ridge and work down the roof. Remove the old shingles carefully and expose the underlying roofing materials.
Once the shingles have been removed, inspect the roof deck for damage.
The example in the source removes the shingles down to the existing paper underlayment before removing the remaining nails.
3. Remove Remaining Nails and Old Underlayment
After removing the shingles, check the roof deck carefully for nails that remain in the wood.
Use a pry bar, roofing shovel, or hammer to remove loose nails. The old underlayment can then be removed when appropriate.
Removing loose nails is important because they can interfere with the new underlayment and shingles.
4. Inspect the Roof Deck
Before installing the new roof, inspect the plywood or roof decking.
Look for:
- Rotten wood
- Soft spots
- Water damage
- Loose plywood
- Damaged sheathing
- Loose seams
Any damaged sections should be repaired or replaced before continuing.
The supplied source specifically identifies rotten areas and loose sections of sheathing that need repair or additional fastening before the new roofing layers are installed.
5. Install Ice and Water Protection
After the roof deck has been prepared, install the appropriate water-protection membrane.
Ice and water protection is commonly used around vulnerable areas such as roof edges and valleys. Exact requirements vary by climate, roof design, manufacturer instructions, and local building codes.
The roofing example installs ice and water protection before the synthetic underlayment.
Manufacturer specifications should always be followed. For example, Owens Corning’s specifications call for specific ice-and-water protection in valleys and require installation details to follow applicable code and product instructions.
6. Install the Synthetic Underlayment
Next, install the roofing underlayment across the prepared roof deck.
Underlayment provides an additional protective layer underneath the shingles. Synthetic underlayment is commonly used in modern roofing systems.
Keep each row straight and properly overlapped. Avoid wrinkles because uneven underlayment can affect the appearance and installation of the shingles.
The supplied roofing source emphasizes keeping the underlayment straight because it can also be used as a reference when keeping shingle courses aligned.
7. Install the Drip Edge
Drip edge is installed along the appropriate roof edges to help direct water away from the roof deck and fascia.
Installation details can vary depending on the roof design and manufacturer instructions. Owens Corning’s specifications, for example, distinguish installation at the eaves and rakes and specify how joints should overlap.
Make sure the metal edge is properly aligned and securely fastened.
8. Install the Starter Shingles
Starter shingles are installed along the lower edge of the roof before the main shingle courses.
They provide a starting point for the first course and help protect the roof edge.
The supplied roofing demonstration explains that the starter course is installed at the bottom edge and that the positioning of the starter material is important for proper shingle coverage.
Manufacturer instructions should determine the exact starter-course dimensions, overhang, and fastening pattern.
9. Install the First Course of Shingles
Once the starter course is installed, begin installing the first main course of shingles.
Work from the lower edge upward. Keep the shingles properly aligned and maintain the manufacturer’s required exposure.
Shingles should be installed according to the instructions printed for the specific product. Owens Corning, for example, specifies starting at the bottom and working across and upward while maintaining uniform exposure and the manufacturer’s recommended offset.
10. Continue Installing Shingle Courses
Continue working across and up the roof.
Pay close attention to:
- Shingle alignment
- Required offset
- Exposure
- Nail placement
- Seams
- Roof edges
- Valleys
- Flashing
- Penetrations
Keeping the courses straight is important for both appearance and proper installation.
The supplied roofing guide uses the lines and markings on the underlayment as visual references to help maintain straight shingle courses.
11. Nail the Shingles Correctly
Proper nail placement is one of the most important parts of shingle installation.
Nails should be installed in the manufacturer’s specified nailing zone using the required number of fasteners.
Avoid:
- Nails that are too high
- Nails that are too low
- Nails driven too deeply
- Nails that are not properly seated
- Nails placed too close to shingle seams
The supplied roofing source explains that over-driven nails can damage the shingle mat, while under-driven or improperly positioned nails may interfere with proper sealing.
The exact number and placement of nails should come from the shingle manufacturer’s instructions and applicable building requirements rather than a one-size-fits-all rule.
12. Install Roof Flashing and Ventilation Components
Areas where the roof meets walls, chimneys, vents, or other penetrations require careful flashing.
Roof ventilation components may also need to be installed depending on the roof design.
Vent installation must be planned carefully so that the opening and flashing are properly integrated with the roofing system. Manufacturer instructions provide specific requirements for positioning, fastening, and sealing roof vents.
13. Finish the Ridge
Once the main shingles reach the top of the roof, install the appropriate ridge materials.
Depending on the roofing system, this may include:
- Ridge vent
- Ridge shingles
- Ridge caps
- Additional flashing
The ridge should be straight and properly sealed.
The supplied roofing source notes that ridge vents and related components require separate installation procedures and manufacturer-specific details.
14. Inspect the Finished Roof
After installation, inspect the entire roof.
Check for:
- Missing shingles
- Loose shingles
- Exposed nails
- Improper nail placement
- Uneven courses
- Damaged flashing
- Open seams
- Improperly installed vents
- Wrinkles in underlayment
- Debris left on the roof
A final inspection helps identify problems before they lead to leaks or other damage.
When Should You Hire a Professional Roofer?
Roof installation involves working at height and requires knowledge of roofing materials, flashing, ventilation, fastening, and local building requirements.
A professional roofer can be especially valuable when:
- The roof is steep
- The roof has multiple levels
- There are complicated valleys
- The roof has skylights or chimneys
- The decking is damaged
- There is extensive water damage
- The home requires a complete roof replacement
- Local permits or inspections are required
Final Thoughts
Learning how to roof a house starts with understanding the complete roofing system rather than simply installing shingles. The process includes removing the old roof, inspecting and repairing the deck, installing water protection and underlayment, adding drip edge and starter shingles, installing the main shingles correctly, and finishing the roof with proper flashing and ventilation.
Most importantly, always follow the specific roofing manufacturer’s installation instructions and local building codes. Roofing products can have different requirements for fastening, exposure, overlap, ventilation, and installation details.
A properly installed roof can provide long-term protection for your home, while poor installation can result in leaks, damaged decking, and premature roof failure.