✓ Key Takeaways
- A full roof replacement includes tear-off, deck inspection, underlayment, ice & water shield, drip edge, all flashing, shingles, ridge cap, and cleanup.
- Deck repair for discovered damaged plywood is typically pre-agreed at a per-sheet rate — get this in writing before signing.
- Gutters, chimney masonry, skylights, and interior damage repair are NOT included in standard roofing scope.
- A legitimate contractor pulls a permit and includes it in the project — not as an add-on.
- Cleanup should include a magnetic roller pass for nails throughout the entire yard and driveway.
A roof replacement is one of the largest home improvement expenditures most Northern Virginia homeowners make. It’s also one where the scope can vary significantly between contractors — some include ice and water shield as standard, others charge extra; some pull permits, others suggest skipping them. This guide gives you a definitive breakdown of what a full, properly-performed residential roof replacement includes so you can evaluate any estimate with confidence.
1. Tear-Off and Disposal of Existing Roofing
The first step of any full replacement is removing the existing roofing material down to the decking. This includes:
- Stripping all existing shingles, including any second layer if present
- Removing all existing underlayment and felt paper
- Removing damaged or deteriorated flashing (to be replaced with new)
- Loading all removed material into a dump trailer or dumpster positioned in the driveway or street
- Hauling and disposing of all removed material at a licensed landfill
Virginia building codes limit residential roof assemblies to two layers of roofing material before full tear-off is required. If your home has two existing layers (common on homes that received a re-roof in the 1990s or 2000s without full tear-off), both must come off. This adds labor and disposal cost — expect $50–$80 per square for a second-layer tear-off surcharge.
2. Deck Inspection and Repair
With the old roofing removed, the full deck surface (plywood or OSB) is exposed and inspected for:
- Areas of delamination, rot, or water damage (soft spots under foot pressure, visible delamination of plywood layers)
- Missing or broken sheathing panels
- Deteriorated or broken rafter tops beneath the sheathing
- Evidence of prior leak damage (staining, dark organic material)
Damaged decking must be replaced before new underlayment and shingles can be installed — installing over deteriorated decking will cause the new roof to fail prematurely. A legitimate contract pre-agrees on a per-sheet replacement rate for any damaged decking discovered during tear-off, typically $80–$120 per 4x8 sheet in Northern Virginia, written into the original contract as a contingency item. Insist on documentation (photos) of any replaced decking.
3. Underlayment Installation
Underlayment is the moisture-resistant layer installed between the decking and the shingles. Modern residential installations use synthetic underlayment (polyethylene or polypropylene woven material) rather than the older 15-lb or 30-lb felt paper. Synthetic underlayment is:
- Significantly more tear-resistant during installation
- More effective as a temporary rain barrier if the installation spans multiple days
- Lighter weight and easier to handle on pitched surfaces
Proper underlayment installation requires 2–4 inch horizontal laps and 6–inch end laps, installed starting at the eave and working up. On steeper pitches (8:12 and above), some specifications call for double-coverage 19-inch exposure products for additional moisture protection.
4. Ice and Water Shield
Ice and water shield is a self-adhering modified bitumen membrane installed at high-vulnerability locations to protect against water infiltration from ice dams and wind-driven rain. In Virginia, the IRC requires ice and water shield at all eave edges and in valleys. A quality installation also includes it at:
- All eave edges (minimum 24 inches from the interior wall plate)
- All roof valleys (full valley width)
- Around all penetrations (chimneys, skylights, pipe boots)
- At all step and counter-flashing locations
Some contractors omit ice and water shield at penetrations or valleys to reduce material cost — this is a quality shortcut that significantly increases the risk of leak at those locations. A proper replacement includes it at all required and recommended locations.
5. Drip Edge and Flashing Installation
Flashing is the metalwork that prevents water infiltration at roof-to-wall and roof-to-penetration transitions. A complete replacement includes replacing all flashing:
Drip Edge
Aluminum or galvanized steel drip edge is installed at all eave and rake edges. It directs water into the gutter rather than allowing it to run behind the gutter or wick back under shingles. IRC requires drip edge; any installation without it is non-compliant.
Valley Flashing
Metal valley flashing (typically 24-gauge galvanized steel or aluminum) or woven valley (shingles woven through the valley) protects the high-water-volume valley channel. Open valley with metal flashing is preferred for longevity in NoVA’s climate.
Chimney Flashing
Counter-flashing (embedded in mortar joints) and step flashing (interwoven with shingles) protect the chimney perimeter. This is typically the highest-failure-rate flashing location on a 15+ year old roof in Northern Virginia because original installations often used roofing cement as the primary seal rather than mechanically attached metal.
Pipe Boot Replacement
Rubber pipe boots around plumbing vent stacks should be replaced with new boots during any full replacement. They’re inexpensive ($20–$40 each) and are the component most likely to fail first on the new roof if old boots are left in place.
Skylight Flashing
All skylights receive new flashing kits during a full roof replacement — either manufacturer step-flashing kits for standard skylights or custom-fabricated flashing for non-standard openings.
6. Shingle Installation
Shingle installation is the most visible component of the project and the one most homeowners focus on, though it’s the last step of a sequence that only works if all prior steps are correct. Proper installation includes:
- Starter strip course at eave and rake edges (critical for wind resistance — starter provides the adhesive bond for the first shingle course)
- Field shingles installed per manufacturer specifications: correct nailing pattern (4 or 6 nails per shingle depending on wind zone), nail placement within the nail strip, correct exposure (offset by shingle type)
- Hip and ridge cap shingles (either cut from field shingles or purpose-made hip and ridge cap product)
- Ventilation integration: continuous ridge vent or box vents must be properly integrated with the shingle installation
A properly completed shingle installation should have consistent exposure throughout, tight butts at joints, and no visible nail heads. From the street, a quality installation has visual uniformity — no waviness, no lifted edges, no course alignment irregularities.
7. Cleanup and Disposal
Cleanup is part of the job, not a courtesy. A complete roofing cleanup includes:
- Removal of all torn-off material from the property
- Magnetic roller pass of all areas around the home where nails could have fallen: driveway, all walkways, lawn areas within 20 feet of the roofline
- Blowing out gutters to remove debris that fell during tear-off
- Collecting and removing any shingle scraps from landscaping, decks, or porches
The magnetic roller pass is essential — roofing nails are small and nearly invisible in grass, mulch, and gravel, but tire punctures from roofing nails are the #1 homeowner complaint after a poorly managed roofing project. Insist that your contract specifies a magnetic sweep of all paved and grass areas around the home.
What Is NOT Included in a Standard Roof Replacement
Understanding what’s excluded helps you avoid surprises and plan correctly:
- Gutter replacement — Gutters are removed and reinstalled if needed to allow drip edge installation, but replacement is a separate contract item.
- Chimney masonry repair or rebuilding — Flashing is included; repointing mortar, replacing chimney caps, or rebuilding deteriorated chimney sections is masonry contractor scope.
- Interior damage repair — Water-stained drywall, damaged insulation, and mold remediation from prior roof leaks are general contractor or specialty contractor scope. The roofing contractor repairs the roof; interior remediation is separate.
- Skylight replacement — Flashing a skylight is included; replacing a failed or cracked skylight unit itself is a separate item.
- HVAC equipment on roof — Curb-mounted HVAC units that need to be temporarily lifted and reset are an HVAC contractor item.
- Structural repairs beyond decking — Replacing a deteriorated rafter or ridge board discovered during decking repair exceeds standard roofing scope; this requires a general contractor or structural carpenter.
- Attic insulation upgrades — The roofing contractor installs a ventilated roof system; attic insulation upgrades are a separate scope.
Visit our roof replacement page for project specifics, browse roofing materials, or ask about roof financing options to make the project more manageable.
Golden Tree Roofing | 100 Adams St, Manassas Park, VA 20111 | (571) 538-9995
Frequently Asked Questions
Does a roof replacement include gutters? +
No — gutters are not part of a standard roof replacement scope. However, the contractor will remove and reinstall gutters that are attached to the fascia to allow drip edge installation. If gutters are old, damaged, or sagging, this is an appropriate time to replace them — but it’s a separate line item.
Does a roof replacement include the chimney? +
The roofing contractor will install and replace chimney flashing as part of the roof replacement. However, chimney masonry repair, chimney cap replacement, or chimney rebuilding are masonry contractor scope and are not included in roofing.
What happens if damaged decking is found during my roof replacement? +
A legitimate roofing contractor will identify damaged (wet, soft, or delaminated) decking during tear-off and document it with photos before replacing it. The cost is typically pre-agreed at a per-sheet rate (usually $80–$120 per 4x8 sheet in Northern Virginia) written into the original contract. This is separate from the base replacement cost.
How long does a roof replacement take in Northern Virginia? +
Most single-family home roof replacements in Northern Virginia (1,500–3,000 sq ft) take one to two days. Very large or complex roofs (high pitch, multiple valleys, dormers) may take two to three days. Weather delays are the primary variable.