Roof Inspection Checklist: What a NY Home Inspector Actually Checks

In New York, home inspectors are licensed by the Department of State under Article 12-B of the Real Property Law, and a "home inspection" under that law covers residential buildings of one to four units. The roof evaluation is one part of that inspection: a visual, non-invasive assessment of the roof as it exists on the day of the visit, designed to identify defects and conditions a reasonable buyer would want to know about.

Inspectors work to written standards of practice. InterNACHI's Standards of Practice, which NACHI members follow, is a good example of how the roof portion is typically defined. Inspectors generally examine:

• The roof-covering materials.
• Gutters and downspouts.
• Vents, flashing, skylights, chimneys, and other roof penetrations.
• The general structure of the roof, as seen from readily accessible areas such as the attic.

Standards like these also list what is not required. Inspectors are generally not required to walk on any roof surface, predict the roof's remaining service life, remove snow or debris, move insulation, perform a water test, or certify or warrant the roof. Most inspectors also note the roofing materials, any visible extra layers, and how they evaluated the roof.

Inspection, not repair estimate

A roofing contractor's inspection is different. A roofer may lift shingles, probe the deck, measure the roof, and price a repair or replacement. A home inspector describes conditions and recommends further evaluation where needed. The two complement each other: the home inspection tells you whether you need a roofer and what to ask them to look at.

The sections below follow the same order most inspectors use, so you can use this roof inspection checklist to follow along on inspection day and ask better questions.

How the inspector views the roof affects how much they can see, and a good report will tell you which method was used.

Walking the roof

When a roof is low enough, moderately pitched, dry, and made of material that can bear foot traffic, many inspectors walk it. Walking allows a close look at shingle condition, fasteners, flashing, and penetrations, and lets the inspector feel for soft spots in the deck.

From a ladder at the eaves

Many standards call for inspecting from the ground or the eaves at minimum. A ladder at the eaves gives a close view of the lower courses, the gutters, and the drip edge, and is often used when walking the roof would be unsafe or could damage it.

From the ground, windows, or a drone

Steep roofs, wet or icy surfaces, tall houses, and fragile materials such as slate, clay tile, and some older wood shingles are commonly viewed from the ground with binoculars, from upper windows or dormers, or with a drone. Drones can capture detailed images of areas that cannot be safely reached, though they cannot feel a soft deck. Commercial drone pilots need an FAA Part 107 certificate, and controlled airspace and local restrictions make drone use far less practical in and around New York City, where inspectors more often reach flat roofs through a roof hatch or bulkhead.

When inspectors decline to walk

Snow cover, a slick surface after rain, or a pitch that would be dangerous to stand on are all legitimate reasons not to walk. If the report says the roof was not fully visible, ask whether a return visit after snowmelt or a roofer's evaluation makes sense before your deadlines.

When you request an inspection quote, ask the inspector how they typically evaluate roofs like yours and whether their report includes roof photos.

The covering is what most people picture when they think of a roof. Here is what inspectors typically look for on the materials most common in New York.

Signs of age and wear on asphalt

Asphalt shingles are the most common covering in New York. As they age they shed their protective granules, which collect in gutters and at downspout outlets. Edges curl or cup, tabs crack, and the roof starts to look uneven. Wind can lift and crease tabs, breaking the seal that holds them down. Inspectors often describe an asphalt roof as early, mid, or late in its service life based on these signs, rather than giving a precise number of years.

Layers and recovering

Where the edge of the roof is visible, inspectors often note whether there is more than one layer of shingles. Building codes generally limit how many layers can be installed, and a roof laid over an older roof can hide deck problems and may shorten the life of the new covering. Ask the seller for permits and invoices for any replacement.

Patching and mismatched materials

Patches are not automatically a problem, but a pattern of patches, mismatched shingles in one area, or fresh sealant around flashing tells the inspector where leaks have occurred.

Most roof leaks do not start in the middle of a field of shingles. They start where the roof changes direction or where something passes through it, which is why roof flashing gets as much attention as the covering itself.

Flashing at walls and chimneys

Where a roof meets a wall, a dormer, or a chimney, metal flashing directs water away from the joint. Inspectors look for step flashing along sidewalls, counterflashing set into chimney mortar joints, and kickout flashing at the bottom of a roof-to-wall intersection, which steers water away from the siding. Missing flashing, or joints sealed only with caulk, is a common finding, especially where an addition meets the original house.

Valleys

Valleys carry concentrated water. Inspectors check for worn or cracked shingles, debris buildup, and exposed or corroded metal in open valleys.

Penetrations

• Plumbing vent pipes: the rubber or neoprene boots that seal them commonly crack with age and sun exposure.
• Exhaust and roof vents: damaged or missing caps, and bathroom or kitchen exhaust ducts that do not reach the outdoors.
• Skylights: flashing condition outside and staining on the interior frame.
• Satellite dish and antenna mounts: holes left by old mounts are a frequent leak source.
• Solar arrays: inspectors typically note mounts and flashing where visible, but panels can block much of the roof from view, and the solar system itself is usually outside the scope of a home inspection.

If a home has rooftop solar, ask for the installation documents, the warranty terms that cover roof penetrations, and the roof's age when the panels went on. Removing and reinstalling an array to replace the roof underneath is a real cost to factor into your offer.

Chimneys are a frequent source of leaks in older New York homes, and a sagging roofline can signal problems that go well beyond the shingles.

What inspectors check on a chimney

• The crown: the concrete or mortar cap at the top, which cracks with freeze-thaw cycles and lets water into the masonry.
• Mortar joints and brick: eroded joints, spalling brick faces, and efflorescence.
• Flashing and counterflashing where the chimney meets the roof.
• The cricket: a small peaked structure on the uphill side of a wide chimney that diverts water and snow around it.
• Leaning or separation: any visible tilt or gap between the chimney and the house.

A home inspection examines the visible exterior of the chimney and what can be seen from the firebox and attic, not the full flue interior. For wood-burning fireplaces and stoves, common in upstate and Hudson Valley homes, a chimney sweep's camera inspection of the flue is the standard follow-up. A chimney that vents a furnace or boiler should be checked for an appropriate liner as well.

Roof structure

From outside, inspectors sight along the ridge and roof planes for sagging, dips, or waviness that can indicate undersized rafters, failing sheathing, removed structural members, or long-term water damage. In the attic, they look at rafters, collar ties, ridge boards, and sheathing for cracks, sistered repairs, notched members, and staining. Older homes, especially farmhouses and Victorians, often show some deflection; the question is whether it looks long-standing and stable or active. Significant sagging, cracked framing, or signs of overloading warrant evaluation by a structural engineer, and in snowbelt areas, where heavy snow loads are a real design consideration, that follow-up should not wait.

A roof's job is to move water off the house, and the gutters finish that job. Inspectors check them as part of the roof evaluation because gutter problems cause damage both above and below.

What inspectors look for

• Gutters that are loose, sagging, pitched the wrong way, or pulling away from the fascia.
• Leaking seams and corners, and rust on older steel gutters.
• Debris, plants growing in gutters, and heavy accumulations of shingle granules, which signal an aging roof.
• Downspouts that are disconnected, crushed, or discharging right next to the foundation.
• Fascia and soffit boards with peeling paint, staining, or rot behind the gutter.
• Drip edge flashing at the eaves, where visible.

Underground drains

Many New York homes have downspouts that feed into buried pipes. Inspectors generally cannot see where those pipes go or whether they are clogged, and standards of practice usually exclude them. If a basement shows water problems and the downspouts run underground, a plumber can test or camera-scope the lines.

Ice and gutters

In snowbelt areas, ice in gutters can tear them away from the house, and overflowing gutters contribute to icicles and ice buildup at the eaves. Bent gutter sections, broken hangers, and stained fascia along the shaded side of a house are clues to past ice problems. Gutter guards and heat cables are common in these regions; inspectors may note them but do not test de-icing equipment.

Gutter and downspout repairs are usually among the least expensive fixes in a report, but they protect the fascia, the siding, and the foundation from the water a roof sheds.

No roof inspection checklist is complete without the attic, because some of the most valuable roof information comes from inside. The underside of the roof deck shows what the shingles hide, and inspectors enter accessible attics, or view them from the hatch, to look for it.

Signs of leaks

• Water stains and dark streaks on sheathing and rafters, especially around chimneys, vents, and skylights.
• Daylight visible through the roof deck.
• Soft, delaminated, or sagging sheathing between rafters.
• Rusted nail tips, which can come from condensation as well as leaks.
• Stained or compressed insulation below a leak point.

Ventilation and moisture

Attic ventilation lets moisture escape and helps keep the roof deck cold in winter. Inspectors look for soffit, ridge, and gable vents, and for insulation blocking airflow at the eaves. They also check whether bathroom and kitchen exhaust fans actually vent outdoors or simply dump moist air into the attic, a common defect that leads to frost and staining on the sheathing during New York winters. Dark discoloration on the sheathing can come from condensation; the inspector may note it but cannot confirm whether it is mold, because mold assessment in New York requires a separate state license.

Spray foam and finished attics

Spray foam applied to the underside of the roof deck can conceal the sheathing and make leaks harder to spot. Finished attic rooms and cathedral ceilings offer little or no view of the deck. Expect the report to note those limitations. Interior ceilings below the roof, especially around chimneys and in top-floor closets, become the next best evidence.

If you attend the inspection, ask the inspector to show you anything they find in the attic, and photograph it yourself. Attic evidence is often the most persuasive support for a repair request, because it shows that water has already gotten in.

New York's weather is hard on roofs, and inspectors who work here pay close attention to the damage patterns it leaves behind.

Lake-effect snow and ice dams

Areas downwind of Lakes Erie and Ontario, including Buffalo, Rochester, Syracuse, and the Tug Hill region, get heavy lake-effect snow. When warm air leaks into the attic, it melts snow on the upper roof; the water runs down and refreezes at the cold eaves, forming an ice dam that backs water under the shingles. Inspectors look for the aftermath: stained soffits, water marks on ceilings and walls near exterior corners, damaged gutters, and the attic insulation or ventilation problems that cause it. Building codes in cold-climate areas commonly call for an ice barrier membrane along the eaves, but it sits under the shingles, so an inspector usually cannot confirm it is there.

Freeze-thaw cycles

Repeated freezing and thawing across the state widens small cracks in chimney crowns, mortar, slate, and sealants, which is one reason flashing and masonry details deserve close attention on older homes.

Wind and coastal exposure

On Long Island and in coastal parts of New York City and Westchester, nor'easters and tropical storms bring high winds and driving rain. Inspectors look for lifted or creased tabs, missing shingles, and loose ridge caps. Salt air can speed corrosion of metal flashing, fasteners, and gutters near the water.

Trees and shade

In the Hudson Valley, the Catskills, and wooded suburbs, overhanging branches drop debris, clog gutters and valleys, and keep roofs damp. Moss and algae are common on shaded slopes, and inspectors will usually recommend trimming branches that touch or overhang the roof.

Winter inspections

Snow can hide the entire roof surface. If your inspection happens in winter, the report may be limited, and you may need to plan a follow-up or a roofer's assessment before your deadlines.

Flat roofs are not just a commercial feature. Brownstones, rowhouses, and many two- and three-family homes in New York City have low-slope roofs behind parapet walls, and suburban homes often have flat sections over porches, additions, and garages.

What inspectors check on a flat roof

• Ponding: standing water, or stains showing where water collects after rain.
• Membrane condition: blisters, cracks, splits, and open seams on modified bitumen, EPDM rubber, TPO, or older built-up roofs.
• Drains and scuppers: clogged roof drains, undersized scuppers, and disconnected leaders.
• Parapets and coping: cracked masonry, loose coping stones, and failed flashing at the base of parapet walls.
• Patching history: layers of coatings and patches that indicate recurring leaks.
• Roof hatches, bulkheads, and skylights: flashing, curbs, and security.
• Rooftop equipment: condensers on stands, satellite mounts, and anything else that penetrates the membrane.

Shared roofs on attached homes

On attached rowhouses, the roof often continues across neighboring buildings with only a parapet or flashing detail between them, and a leak can start on a neighbor's side. Inspectors can only evaluate the roof of the property being inspected, so ask the seller about any shared-roof repairs or agreements. Our NYC brownstone inspection guide covers other rowhouse-specific issues.

Condos and co-ops

If you are buying a condo or co-op unit, the roof is typically a common element maintained by the association or corporation, and the inspector of an individual unit may not have access. Ask the managing agent for the roof's age, recent repairs, and whether replacement is planned in the capital budget, because a roof project can mean an assessment.

A New York home inspection covers residential buildings of one to four units. Larger apartment buildings, mixed-use properties, and commercial buildings fall outside that definition, and their roofs typically call for a different kind of evaluation.

Why commercial roofs are different

Commercial roofs are often large, low-slope systems: single-ply membranes, modified bitumen, built-up roofs, or coatings over older roofs. They carry heavy rooftop equipment, have multiple drains, and may have been recovered more than once. Moisture can spread sideways under a membrane far from where it entered, so a visual inspection alone may not reveal how much of the insulation is wet.

What a commercial roof assessment may include

• A full walk of the roof surface, with photos and a roof plan.
• Evaluation of drains, scuppers, parapets, and equipment curbs.
• Infrared or other moisture surveys to locate wet insulation, where appropriate.
• Core samples, with the owner's permission, to identify layers and insulation condition.
• Notes on remaining useful life to support budgeting by the owner or lender.

Lenders and investors in commercial transactions often want this information as part of a property condition assessment. Commercial inspectors, roofing consultants, and engineers all offer roof evaluations, and the right choice depends on the property and the lender's requirements. Our guide to commercial flat roof inspections goes deeper.

Safety and access

Commercial roofs often require hatch access, fixed ladders, and fall protection, and not every building has edge railings, so arrange safe access with the owner or building manager well in advance.

Knowing the limits of the roof evaluation protects you from both false confidence and unnecessary alarm. A standard home inspection generally does not:

• Predict remaining life. Inspectors may describe a roof as near the end of its service life, but they do not promise a number of years.
• Certify that the roof is watertight or guarantee it will not leak.
• Lift shingles or remove materials to inspect the deck or underlayment, or confirm fastening patterns.
• Perform water tests that spray the roof to reproduce a leak.
• Remove snow, ice, or debris that hides the surface.
• Inspect attachments such as antennas, satellite dishes, lightning protection, or de-icing cables.
• Evaluate warranties or whether the roof was installed to the manufacturer's requirements.
• Inspect underground drain lines from downspouts, or areas that cannot be safely viewed.

Why these limits exist

A home inspection is a broad, non-invasive look at the whole house in a few hours. Destructive testing would damage property the buyer does not own, and guarantees of future performance would be impossible to honor: a roof that looks sound in October can still leak in February from a cause that was not visible.

When to bring in a roofer

Ask for a roofing contractor's evaluation when the inspector recommends it, when the roof could not be fully viewed, when it appears to be near the end of its life, when there are signs of active leaks, or when the house has slate, tile, or a complex roof that calls for specialized knowledge. For slate in particular, look for a contractor with slate experience; a general roofer may recommend replacement when repair is possible.

Roof findings are where many New York negotiations focus, so read this part of the report slowly and in order.

Get real numbers

Repair and roof replacement costs vary with roof size, pitch, material, the number of layers to remove, access, and local labor markets. Rather than negotiating on an assumption, get one or more written contractor estimates within your contingency or attorney review window. Those estimates support a credit, a price adjustment, or a repair request. Our guide to negotiating repairs after a home inspection in NY covers the options.

Ask for documentation

Request receipts, permits, and any transferable warranty for past roof work. The local building department may have re-roofing permits on file.

Check insurance early

Some homeowners insurers ask about roof age and condition, and an older roof can affect coverage or how a claim is settled. Share the roof findings with your insurance agent before closing so there are no surprises.

Inspecverse is a free New York directory, not an inspection company. We do not inspect roofs or employ inspectors. When you submit a request, our team reviews it and routes it to a local NACHI-listed inspector who serves your area. That inspector may then contact you to talk through the property, scope, timing, and price.

Get more from your request

• Tell us the property type and the roof type if you know it: asphalt, slate, metal, or flat.
• Mention concerns such as ceiling stains, a roof you were told is old, rooftop solar, or a flat section over an addition.
• Share your deadlines, especially in winter when the roof may be snow-covered.

When the inspector contacts you, ask how they evaluate roofs: whether they walk them when safe, use a drone, and include attic photos in the report. Confirm their active New York home inspector license with the Department of State before you book; license numbers must appear on reports and advertising, and Inspecverse does not verify licenses. If the building has more than four units or is commercial, say so in your request, because that calls for a different scope than a home inspection.

A clear roof section in your inspection report is one of the strongest negotiating tools you will have. Request a free inspection quote early so there is time for a roofer's follow-up if you need one.