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Before a new roof covering is installed, evaluate the entire roof assembly: decking, underlayment, flashing, penetrations, ventilation, gutters, drainage, and nearby trim or masonry. A durable reroofing project is not simply a shingle or tile purchase. Ask for a written scope that explains the condition of each component, what will be repaired or replaced, how local permits and inspections will be handled, and how concealed damage discovered during tear-off will be authorized and priced.
The correct details depend on your roof design, covering, climate, observed condition, manufacturer instructions, and the code adopted by your local jurisdiction. Use this guide to make your contractor conversation specific without assuming that one material or specification fits every house.
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Roof performance comes from several connected layers and details working together. The visible covering sheds most rain and weather, but the deck supports the assembly, underlayment provides a secondary water-shedding layer, flashing directs water around interruptions, ventilation manages heat and moisture in the roof or attic space, and gutters and drainage move runoff away from the building. Roof-wall intersections, valleys, slope changes, chimneys, skylights, pipes, and mounting brackets are all points where those components must meet correctly.
Chapter 9 of the 2024 International Residential Code states: “Roof assemblies shall be designed and installed in accordance with this code and the approved manufacturer’s instructions such that the roof assembly shall serve to protect the building or structure.” Read the chapter at the International Residential Code, 2024 edition, Chapter 9. That is a model code reference, not proof that your city or county has adopted the 2024 edition. Local amendments and the edition enforced when your permit is issued control.
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A 2009 federal publication gives useful broad context about roof-covering components, but it should not be treated as current code or product guidance. For a project decision, rely on the adopted local code, approved manufacturer instructions, and an inspection of the actual house.
Confirm jurisdiction, permits, and the written scope first
Before comparing prices, identify the rules that will govern the work. Ask the local building department which residential code edition and amendments apply, whether a reroofing permit is required, what inspections are expected, and whether special requirements apply to structural work, historic properties, wind exposure, or other local conditions. A contractor can help with paperwork, but the building department is the authoritative source for your address.
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- The proposed roof covering and the manufacturer installation instructions that apply.
- The underlayment system and where it will be installed.
- Decking assumptions, including reattachment or replacement allowances.
- Flashing work at penetrations, walls, valleys, gutters, and transitions.
- Ventilation work and any changes to intake or exhaust openings.
- Gutter and drainage work, including removal and reinstallation if applicable.
- Repairs to adjacent wood trim or chimney mortar when those conditions are found.
- Permit responsibility, inspection coordination, cleanup, and protection of landscaping or other property.
- The written process, labor rates, material prices, and approval requirements for concealed damage.
If an item is excluded, have the exclusion stated plainly. “Replace as needed” is not a useful scope unless “needed” is defined and the authorization process is clear.
Evaluate the roof deck while the covering is off
The deck is the structural surface beneath the underlayment and covering. Its condition may not be fully visible until the existing roof is removed. Before signing, ask whether the contractor expects the deck to be acceptable as-is, to need reattachment, or to require replacement in sections or across larger areas.
Texas Department of Insurance guidance puts the homeowner’s question directly: “Is my roof decking acceptable as it is or should it be properly reattached or possibly replaced while the existing roof has been removed?” You can review its contractor questions at Questions to Ask Your Contractor BEFORE Roofing. Although the guidance is Texas-specific, the question is useful anywhere.
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Define each possible deck outcome
- Acceptable as-is: The exposed deck meets the contractor’s stated condition criteria and local requirements.
- Reattachment: Existing panels or boards remain usable but need additional or corrected fastening. The proposal should explain the fastening method and any access or inspection requirements.
- Repair or replacement: Deteriorated, damaged, or otherwise unacceptable areas are removed and replaced with compatible material. The scope should state whether pricing is by sheet, linear measure, square foot, or another unit.
Do not accept a vague promise that deck work will be “handled later.” Agree in advance on how concealed deterioration will be documented, who can authorize the work, and how the price will be calculated. A practical process is to photograph exposed areas, mark their locations on a roof plan or estimate, describe the observed condition, and obtain your written approval before non-emergency changes proceed. Ask whether a building official must inspect structural repairs before they are covered.
Specify underlayment as part of the water-shedding system
Underlayment is not an interchangeable line item. Its intended use depends on the selected covering, roof slope and geometry, climate exposure, local code, and manufacturer instructions. Have the proposal name the underlayment or system being installed and identify where it will be used, including at eaves, valleys, penetrations, and other areas that require additional water protection under the adopted rules.
Ask how the underlayment will be integrated with flashing so water is directed outward rather than trapped between layers. The contractor should explain preparation of the deck, fastening or attachment, overlap and sealing details where required, and how the installation will remain compatible with the covering manufacturer’s instructions. A product name without an installation location or purpose does not describe the complete water-control strategy.
Review every flashing location and roof transition
Flashing is the formed or layered material that directs water around interruptions and changes in plane. It must work with the underlayment and covering, not be treated as a cosmetic accessory. Ask whether existing flashing will be reused, modified, or replaced and why that choice is appropriate for the new assembly.
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Have the contractor identify flashing at plumbing pipes, chimneys, skylights, vents, solar or other mounting brackets, and any other roof openings. The U.S. Department of Energy’s Building America Solution Center explains the water-control principles for this work in Flashing of Penetrations in Existing Roofs. Ask how each penetration will be sequenced with the underlayment and covering, and whether deteriorated collars, curbs, or surrounding materials are included in the scope.
Walls, valleys, and changes in direction
Roof-to-wall intersections, sidewalls, headwalls, valleys, and changes in slope or direction need deliberate detailing. The estimate should list these areas rather than saying only “install flashing.” Ask how water will be lapped and directed at each transition, how old materials will be removed without damaging adjacent siding or masonry, and whether counterflashing or other integrated components are included where applicable.
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Gutters and roof edges
At eaves and gutters, flashing, edge details, fascia, and the drainage path must be coordinated. Confirm whether gutters are being removed and reinstalled, repaired, rebuilt, replaced, or left in place, and how the new roof edge will connect to them. A gutter that is sound but poorly integrated with the new edge can still leave a water-management problem.
Check ventilation without assuming a universal formula
Ventilation should be evaluated as part of the roof and attic assembly. Ask the contractor to describe the existing intake and exhaust arrangement, whether it is adequate for the roof design, and whether reroofing will block, reduce, or improve airflow. The proposal should identify any work involving soffit or eave intake, ridge or other exhaust openings, baffles, or attic-side obstructions when those conditions are relevant.
There is no single ventilation specification that can be applied safely to every house from a generic checklist. Roof shape, insulation, vapor control, climate, and the location of existing openings affect the appropriate solution. If the contractor proposes a change, ask what problem it addresses and how the completed work will preserve a continuous, code-compliant airflow path. Ventilation work should not be used to conceal unrelated moisture sources such as plumbing leaks or wind-driven rain entry.
Include drainage, gutters, and nearby conditions
Roof runoff must be carried away from walls, foundations, walkways, and other vulnerable areas. Ask for an inspection of gutters, downspouts, outlets, splash control, and discharge locations while the roof is being evaluated. The work may involve cleaning, repair, rebuilding, replacement, removal and reinstallation, or no change if the existing system is suitable. The proposal should state which of these applies instead of assuming that reroofing automatically includes gutter work.
Also inspect adjacent deteriorated wood trim, fascia, soffits, and other edges that the roofing work depends on. If damaged trim is left in place, new flashing may not have a sound surface to attach to. Conversely, sound trim does not need replacement merely because the roof is being replaced. Ask the contractor to distinguish observed deterioration from optional appearance upgrades.
Where a chimney is present, examine mortar joints, caps, masonry surfaces, and the way flashing meets the chimney. Repointing or masonry repairs may require a separate trade or a clearly priced allowance. A roofing proposal should identify the condition and coordination responsibility even when chimney restoration is outside its own scope.
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Use the same questions to compare proposals
The lowest total is not a meaningful comparison if one estimate excludes deck work, flashing, permits, or drainage. Put proposals side by side using the actual assembly scope:
| Proposal item | What to compare | What an adequate answer identifies |
|---|---|---|
| Roof covering | Material, installation method, and manufacturer instructions | Specific covering and installation basis for your roof design |
| Deck | Condition assumptions and concealed-damage pricing | Accept, reattach, repair, or replace criteria; unit prices and approval process |
| Underlayment | System and locations | Named material or system, intended use, and integration with flashing |
| Flashing | Penetrations, walls, valleys, edges, gutters, and transitions | Replace, reuse, or modify by location, with exclusions stated |
| Ventilation | Existing airflow and proposed changes | Intake/exhaust work, limitations, and any attic-side preparation |
| Drainage | Gutters, downspouts, outlets, and discharge | Clean, repair, rebuild, replace, remove/reinstall, or no work |
| Adjacent conditions | Trim, fascia, soffits, and chimney mortar | Observed defects, responsible trade, and separate pricing if needed |
| Administration | Permits, inspections, cleanup, and change orders | Who obtains approvals, protects the property, documents changes, and gets authorization |
When a cell cannot be answered from the estimate, request a written clarification rather than inferring that the work is included. The adopted code and manufacturer instructions should be the reference for technical details, not a contractor’s promise that a familiar shortcut is “standard.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Set a tear-off and concealed-damage procedure before work begins
Agree on the sequence and communication method before the first removal day. A clear procedure prevents pressure decisions when the roof is open:
- Confirm the approved scope, permit status, inspection points, contact people, and emergency authority in writing.
- Have the contractor photograph exposed decking, flashing locations, penetrations, and any adjacent deterioration.
- Require a description of the condition, affected area, proposed corrective work, material, labor, and price or unit rate.
- Authorize non-emergency changes in writing, preferably with a revised estimate or signed change order.
- Have required inspections occur before repaired deck areas are covered.
- Keep records of photographs, approvals, invoices, product instructions, and warranties with the final project documents.
If weather creates an immediate risk after tear-off, the contractor may need to install temporary protection first. Your agreement should explain who can authorize emergency protection and how the cost will be reported.
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Common proposal problems and how to correct them
“New roof” with no component list
Ask for separate lines for covering, underlayment, deck assumptions, flashing, ventilation, drainage, permits, and cleanup. A single square-foot price can hide major exclusions.
Allowance with no measurement or unit
Request the unit basis and a method for measuring concealed work. “Allowance as needed” is difficult to audit unless the contractor states the per-sheet, per-square-foot, hourly, or other charge.
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Reuse of old flashing without an inspection standard
Ask what condition makes existing flashing reusable, how it will be integrated with the new layers, and which locations will receive new material. Reuse should be a documented decision, not an assumption.
Ventilation promised without an airflow explanation
Ask the contractor to map intake and exhaust openings and explain how the proposal affects them. If the roof assembly or insulation changes, request confirmation that the airflow path remains appropriate.
Gutters treated as someone else’s problem
Clarify removal, storage, reinstallation, repairs, and final discharge. Coordinate gutter work with roof-edge and fascia repairs so each trade’s responsibility is clear.
Code claims that do not name the jurisdiction
Ask which adopted code edition and amendments are being used and verify permit requirements with the local building department. The 2024 IRC is a reference point, not a universal mandate.
Homeowner checklist before signing
- Local code edition, amendments, permit requirement, and inspection schedule are confirmed.
- The proposal names the roof covering and identifies applicable manufacturer instructions.
- Decking will be evaluated after tear-off, with clear criteria for acceptance, reattachment, repair, or replacement.
- Concealed damage will be photographed, described, priced, and authorized through a written process.
- Underlayment is identified by intended use and location.
- Flashing scope covers penetrations, roof-wall intersections, valleys, edges, gutters, and transitions.
- Ventilation is evaluated as an intake-and-exhaust system rather than a generic add-on.
- Gutters and drainage are assigned a definite outcome: clean, repair, rebuild, replace, remove/reinstall, or no work.
- Adjacent trim, fascia, soffits, and chimney mortar are inspected and assigned to the responsible trade.
- Change-order prices, emergency authority, cleanup, property protection, and inspection responsibilities are written down.
What a qualified inspection can and cannot decide
A roofing professional can evaluate the visible and exposed conditions of your particular assembly and explain options. The sources cited here do not establish one universally best covering, underlayment, flashing material, ventilation layout, or gutter configuration. Those decisions change with the building, climate exposure, roof geometry, construction, observed damage, manufacturer instructions, and local enforcement.
For project-specific decisions, obtain an inspection from a qualified roofing professional and confirm requirements with your local building department. Treat guidance from another state or municipality as a useful question list, not as proof that the same permit, detail, or code rule applies at your address.
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