Roof Repair in Mercer County, NJ

Most Trenton row-house leaks come from rear flat roofs, shared parapets, box gutters or party-wall flashing, and many can be repaired without replacing the whole roof. Trenton neighbourhoods such as Mill Hill, Chambersburg, Wilbur and the North Ward have long blocks of attached row houses and twins, many built before 1940.

These buildings often have a sloped front roof and a flat or low-slope rear section over kitchens and bathrooms. Over the years, many rear roofs have been covered with several layers of roll roofing, built-up roofing or modified bitumen.

Shared walls create unique problems. Water can enter at a neighbour’s parapet, travel along a joist and appear in your ceiling. Flashing where two roofs meet, or where one roof is higher than the next, is a common failure point. Box gutters built into the front cornice can crack and leak inside the wall.

We inspect the full roof area, including parapets, coping, gutters, drains and neighbouring roof transitions. Coring a small sample shows how many layers exist and whether insulation or decking is wet.

Repairs may include new seams, rebuilt parapet flashing, relined box gutters and improved drainage. When the roof has many layers or a soft deck, replacement with proper slope and drainage is usually better. Because row houses are attached dwellings, replacement generally requires a permit. Coordinating with neighbours on shared flashing also helps prevent future leaks.

If your Princeton home is in one of the town’s 20 historic districts, plan for preservation review before changing roofing materials, and expect the Commission to favor repair and in-kind replacement. Princeton’s Historic Preservation Commission reviews applications for work in designated districts, and the town’s ordinance includes standards for roofing on historic structures.

The ordinance says original roofing material should be maintained or repaired where possible. When replacement is necessary, it should match the original in material and size, and if the original material is unavailable, a substitute should match its shape and size. Roofs on new or altered non-historic buildings in districts should be visually compatible with the district.

In practice, that means slate, cedar and copper roofs are usually repaired rather than replaced with different materials. Broken slates can be replaced with matching stone, copper valleys and flashing rebuilt, and built-in gutters relined.

Before starting work, contact Princeton’s historic preservation staff to confirm whether your property is in a district and what approvals are needed. Prepare photos of the existing roof, a description of materials and a written scope. We can document current conditions and provide material details for your application.

Ordinary maintenance, such as replacing a few slates with matching material, may require less review than a full replacement or material change, but confirm with the town first. Starting work without approval can cause delays and added cost.

Repair if the roof is sound and the problem is isolated; replace if the roof has two layers, widespread wear, repeated leaks or a soft deck. Mercer’s median home was built in 1967, and Hamilton, Ewing and Lawrence have many capes, ranches and splits from the 1940s to 1970s.

These homes often have specific weak points. Dormers need step flashing at every course, and chimneys need counter flashing cut into mortar joints. Split-levels have roof-to-wall joints where lower roofs meet upper walls. Older homes may have plank decks with gaps, and many attics lack adequate ventilation.

We start with the attic. Stains around chimneys or dormers point to flashing problems, while widespread darkening, rusted nails or soft decking suggest broader issues. On the roof, granule loss, cracking and curling show age.

If the roof already has two layers, New Jersey rules prevent adding a third, so replacement requires full tear-off. That is the time to correct ventilation, add ice and water shield at eaves and valleys, install drip edge and replace damaged decking. Deck replacement requires a permit.

For a younger roof with one leak, targeted repairs such as new flashing or pipe boots are often the best value. We explain options with photos so you can make the decision with the evidence in front of you.

After a tornado or severe windstorm, check for tree damage, lifted shingles and hidden structural damage, document everything and secure openings quickly. On September 1, 2021, an EF0 tornado with 65 to 85 mph winds tracked nearly three miles from Route 1 in West Windsor to Lake Carnegie in Princeton, snapping trees and bringing down utility poles.

1. Stay safe. Keep away from downed wires and do not climb onto a damaged roof.
2. Document damage. Photograph the roof, attic, ceilings and any trees or limbs before cleanup.
3. Secure the roof. Tarping prevents further water damage, and insurers generally expect reasonable steps to protect the home.
4. Inspect beyond the surface. A limb strike can crack rafters or decking even when shingles look intact. We check the attic side as well as the roof.
5. Notify your insurer. Ask about deductibles and documentation, and keep receipts for tree removal and tarping.
6. Get a written scope. We provide dated photos and an itemized scope separating storm damage from age-related wear.

Even weak tornadoes and strong thunderstorms can damage roofs through falling trees and flying debris. Mercer’s mature tree canopy in Princeton, Lawrence and Hopewell makes regular tree trimming and post-storm inspections important. Be cautious with contractors who show up uninvited after storms; verify registration and insurance and get a written contract before work begins.

Townhome and condo roofs require association approval, coordination across units and permits for replacement. West Windsor, East Windsor, Robbinsville and parts of Hamilton have large attached-home communities built mostly from the 1970s through the 2000s.

Start by confirming responsibility. Some associations maintain all roofs, while others leave them to owners but set rules on materials, colors and contractors. Review your master deed and bylaws, and contact your property manager before scheduling work.

Because townhomes and condos are attached dwellings, the ordinary-maintenance exemption for detached one- and two-family homes does not apply, so replacements usually require permits.

Leaks in attached buildings can be hard to trace. Water may enter through a neighbour’s skylight, a shared valley or party-wall flashing and appear in another unit. We inspect across unit lines and photograph the source.

Associations often require specific shingle lines and colors so roofs look uniform. When one section is replaced, transitions between old and new roofing need careful flashing. Clear communication with neighbours and managers helps keep the project smooth. Many original 1990s and early 2000s roofs in these communities are now reaching replacement age, so associations may plan phased replacements. Ask whether your community has a reserve study or replacement schedule.

Choose a registered, insured roofer who inspects carefully, explains the problem with photos and puts the price, scope and warranty in writing. Mercer homeowners range from Trenton row-house owners to Princeton historic homeowners and suburban associations, so experience with your roof type matters.

Check the contractor’s New Jersey home improvement registration, which begins with 13VH, on the state’s license verification site. Registered contractors must carry at least $500,000 in commercial general liability insurance.

Review the contract. New Jersey requires home improvement contracts to be written and signed, list the contractor’s legal name, business address and registration number, state the total price, include proof of insurance and give a three-business-day right to cancel.

Ask how the roofer inspects. A good inspection includes attic checks, flashing review, ventilation, gutters and photos. For row houses, ask about shared parapets and neighbour coordination. For historic homes, ask about slate, cedar and preservation review experience.

Be cautious with anyone who pushes a full replacement without evidence or offers a quick patch without finding the source of the leak.

Compare written warranties. Our workmanship warranty is 2 years on repairs and 10 years on full replacements, in writing. A contractor who answers questions clearly and documents the work is more likely to stand behind it.