Roof Repair for New Jersey Homes

Where leaks start

What causes most roof leaks in New Jersey?

Leaks usually start where the roof is interrupted: flashing, pipe boots, valleys and the edges. Winter adds ice dams, and nor’easters add wind that lifts shingles and drives rain sideways.

Flashing at chimneys, walls and skylights

Flashing is the metal that seals the joint where the roof meets a chimney, a wall, a skylight or a dormer. When it lifts, corrodes or loses its sealant, wind-driven rain runs behind it. HomeGuide (February 2026) puts flashing repair at $200 to $500 nationally.

Chimney masonry is a separate trade. If the water is coming through the brick or the chimney crown rather than the flashing, we tell you so; that repair is work for a mason.

Pipe boots and roof vents

Plumbing vents pass through the roof inside a collar called a pipe boot. Rubber collars dry out and split with age, and water then follows the pipe down into the house. HomeGuide lists a vent boot replacement at $75 to $150.

Ice dams at the eaves

An ice dam is a ridge of ice along the eave. It builds when attic heat warms the deck enough to melt snow, and the runoff freezes again over the unheated overhang. Water then pools behind the ridge and can work its way under the shingles and into ceilings and walls (University of Minnesota Extension).

A repair fixes the damage, but air sealing, insulation and ventilation stop the cause. If ice dams return every winter, a new roof with an eave membrane is the lasting fix on the roof side. Our ice dam guide covers the attic side.

Wind-lifted and missing shingles

Strong gusts can break the seal under a shingle and fold it back, and a lifted shingle may tear away in the next storm. Rutgers’ state climatology office reports that nor’easters arrive most often from October through April. HomeGuide prices replacing up to 25 missing shingles at $100 to $300.

Worn valleys

A valley is the inside corner where two slopes meet, and it carries the water from both. Shingles or metal there tend to wear sooner, and leaves that pile up in a valley hold water against them. HomeGuide puts valley repairs at $200 to $850.

Metal roofs

Screw-down metal panels leak differently. The rubber gaskets beneath each screw head wear out in the sun long before the panel does. Sheffield Metals suggests inspecting those screws yearly and swapping out any that are loose, backing out or rusted. Standing seam hides its fasteners, so its weak points are flashings and penetrations.

The visit

What happens during a roof repair visit?

We track down the source, show you the problem and put the repair price in writing before anything is fixed.

1. We ask about the leak: where it shows, when it started and what weather brings it on.
2. We look inside at the attic, the stained ceiling and any wet insulation we can reach.
3. We look outside at the flashing, pipe boots, valleys, edges and the shingles or panels near the suspected spot, from the roof when it is safe to walk.
4. We photograph what we find and walk you through it.
5. You get a written price for the repair. If the roof is near the end of its life, we say so and can price a replacement as well.

We call you back to set up the visit. Snow, ice and storms can make a roof unsafe to walk, so timing depends on the weather as well as the schedule.

A repair priced above $500 calls for a written contract that both sides sign. The three-business-day right to cancel applies to it too, running to midnight of the third business day after your copy reaches you (N.J.S.A. 56:8-151, as amended).

No construction permit is needed to fix the shingles or panels on a detached one- or two-family house, since the state code calls that ordinary maintenance. Structural work, like replacing rafters, falls outside that category (N.J.A.C. 5:23-2.7).

Repair or replace

When is it time to replace instead of repair?

When the roof is near the end of its estimated life, when leaks appear in more than one place, or when the deck itself has gone soft. Patching an old roof again and again can cost more than it saves.

• Age: about 20 years for 3-tab and about 30 for architectural shingles, per InterNACHI.
• Wear across whole slopes: curling, cracking or bare patches where the granules are gone.
• Repeat leaks after earlier repairs, or new ones every storm season.
• Soft or sagging decking, which no surface repair can fix.
• Big repair bills. A major repair at $3,000 to $6,000 or more is a real share of HomeGuide’s $10,800 national average for a new asphalt roof.
• Patches that will not match. New shingles on an old roof may differ in color, and some styles may no longer be made.

A replacement brings its own rules: with two or more layers already on, New Jersey requires a full tear-off. Read about roof replacement and asphalt shingle roofing, or a metal roof, which InterNACHI estimates at 40 to 80 years. Weighing the two? See metal roof vs shingles.