New Home Roof Inspection Checklist for Buyers — What to Check Before Closing

A straight ridge line indicates sound structural framing. Sagging in the ridge or visible dips in the roof plane suggest failed rafters, overloaded trusses, or long-term water damage to the decking. Structural roof repairs cost $5,000–$15,000. If you see sagging, this is a potential deal-breaker that needs a structural engineer's assessment.

Use binoculars to scan all visible roof surfaces. Missing shingles are obvious water entry points. Curling shingles have lost their adhesive seal and are vulnerable to wind blow-off. Buckling shingles indicate moisture problems in the deck below. More than 5–10 affected shingles on a single slope indicates the roof is nearing end of life.

Asphalt shingles shed granules as they age. A small amount in gutters is normal. Heavy accumulation — resembling coarse black sand filling the gutter channels — indicates advanced shingle deterioration. When enough granules are lost, the asphalt layer underneath becomes exposed to UV and degrades rapidly. Heavy granule loss means 3–7 years of remaining life at most.

Dark streaks (algae) are cosmetic on newer roofs but indicate moisture retention that accelerates aging. Moss holds moisture against shingles and can lift shingle edges. Widespread moss growth on one slope (usually the north-facing side) suggests poor sun exposure and drainage — a permanent condition that accelerates wear on that slope.

The roof age determines remaining lifespan and warranty status. A 5-year-old architectural shingle roof has 20–25 years left; a 20-year-old one may need replacement within 5 years. If the seller doesn't know the date, check permit records with the local building department — roof replacements require permits, and permit records are public.

Most manufacturer warranties are transferable to a new owner, but some require registration within 30–60 days of closing. Workmanship warranties from the installer may or may not transfer. Get copies of all warranty documents and read the transfer provisions. A non-transferable 30-year warranty is worthless to you as a buyer.

Sellers are legally required to disclose known defects in most states, but they may not volunteer information about patched leaks or insurance claims unless asked directly. A roof with a history of leaks may have hidden damage to decking, insulation, or framing that's been cosmetically repaired but not structurally addressed.

Some homes have a second layer of shingles installed over the original. While some codes allow two layers, a double-layered roof adds 300–500 lbs per square to the structure, hides deck damage, and makes the next replacement more expensive (two layers to tear off). Lift the edge of a shingle at the drip edge to count layers, or ask the seller.

Flashings are the most common source of roof leaks, and flashing problems are invisible from the ground. The inspector should check chimney step flashing and counter flashing, wall step flashing, valley metal or woven valley condition, and every pipe boot and penetration seal. Failed flashings can leak for years before causing visible interior damage.

The attic tells the roof's true story. Water stains on the underside of the deck reveal current or past leaks. Mold on rafters indicates chronic moisture problems. Inadequate ventilation (blocked soffits, no ridge vent) shortens roof life and creates ice dams. A good attic inspection takes 20 minutes and reveals problems that no exterior inspection can see.

A qualified roof inspector can estimate remaining useful life based on material condition, granule loss, seal integrity, and local climate factors. This number is critical for negotiation — if the inspector says 5 years remaining, you can negotiate the prorated replacement cost off the sale price. Get this in the written report.

A perfect roof on a house with failed gutters still gets water damage. Check that gutters are properly sloped, securely attached, free of holes or rust, and that downspouts direct water away from the foundation. Gutter replacement costs $1,000–$3,000 — add this to your renovation budget if the system is failing.

Don't negotiate based on vague 'roof needs work' language. Get a written estimate from a local licensed roofer detailing exact repairs or replacement cost. Present this to the seller as supporting documentation for your price reduction request. A written estimate carries far more weight than a general inspection report's recommendation.

Sellers who agree to repair the roof before closing often hire the cheapest contractor and use the cheapest materials. You're better off negotiating a price reduction or having repair funds held in escrow so you control the contractor, materials, and quality. A $10,000 roof credit puts you in charge of the outcome.

Insurers increasingly refuse to cover homes with roofs older than 15–20 years, or they exclude roof damage from the policy. Get an insurance quote before closing to verify the roof's age and condition won't create coverage gaps or inflated premiums. A roof-related insurance denial after closing is a devastating surprise.