A roof calendar for northern New Jersey runs by season. Spring is for finding winter damage, late summer for storm checks, late autumn for clearing and sealing before freezing, and winter for snow and ice. The freeze window runs roughly late October to mid-April, and those dates are a planning guide, not a forecast.
Key takeaways
- The approximate freeze window runs from late October to mid-April, and the normal early-January low in Newark sits in the mid-20s Fahrenheit.
- Early August to early September is the window when Isaias and Ida came through, so late-summer checks are worth scheduling.
- Autumn is the time to clear gutters and drains and check flashing before freezing weather sets in.
- After any snowfall or ice event, check drains and the snow line on flat roofs, and the eaves on pitched ones.
- The calendar helps you plan inspections. It is not a promise of when a crew will be free or what a visit will cost.
How should you use a seasonal roof calendar?
A calendar shows when each check is most useful, not when a roof will fail. Use it to schedule inspections and to know what to look for at each point in the year, and treat every date as approximate, since the sourced record is limited.
Roof problems follow the weather, and the weather in northern New Jersey changes with the season. A calendar helps you prepare for each part of the year, notice small changes before they become leaks, and plan a visit when a technician's time is not rushed.
The dates here are anchored to what research could source: the approximate freeze window, the normal January low and the storm windows that brought Isaias, Ida and Sandy. Where the record is missing, the calendar says so and uses a general reading. No month is singled out for a re-roof, because research did not establish one.
Keep one record for the house. Write down the date of each check, what you saw and any work done. A roof with a record is easier to assess, whether you are deciding on a repair or preparing for a sale.
What should you check in spring?
Spring is the time to look for damage left by winter. Check for lifted coverings, cracked flashing, loose gutters and any new staining inside the top floor, because freeze-thaw cycles often open small gaps that show up after the thaw.
The last spring freeze is placed around mid-April in an approximate encyclopedia entry, so spring checks fall in the weeks after the cold has settled. Wait until the surface is dry and firm before going onto a roof, and do the first check from the ground and from inside.
Look at the flashing around chimneys, vents and walls, the valleys on a pitched roof, and the coping and parapet on a flat one. A crack or gap that opened over winter is easier to seal in spring than after the next storm.
Inside, look for new stains on the ceilings and walls of the top floor, and in the attic for darkened deck boards. Spring leaks are often found in the attic, where a wet patch that has since dried still shows.
What does early summer need?
Early summer is a good time to clear gutters and downspouts, trim branches near the roof and check the surface after spring rain. Sun and heat can open shrinkage in old sealants, so sealed seams and penetrations deserve a look.
Trim branches that overhang the roof or rub the surface. Tree limbs do the most damage in wind, and a branch that touches a covering in June can cause a lift in August. Clear debris from the surface and from the drains on a flat roof.
Check sealed joints and penetrations: vent pipes, the chimney crown, skylights and any seam on a flat surface. Heat expands and contracts materials, and a sealant that has lost its grip is easier to renew before the storm season.
Summer heat also shows up as an attic problem. A hot, poorly ventilated attic can age a roof from below. The attic ventilation and insulation service page describes what a technician looks at.
Why is late summer the storm check?
Late summer is when tropical remnants and wind reached northern New Jersey in the sourced record, including Isaias in August 2020 and Ida in September 2021. A check before that window makes wind and water damage easier to tell apart later.
The sourced record places the late-summer storms in early August to early September, and two of the three storms that matter most to northern New Jersey roofs arrived then. A check before the window, and a short one after any storm, gives you a baseline to compare against.
Focus on the parts that wind and water test: the ridge, the edges, the flashing at walls and the drains on a flat roof. Look for lifted coverings and displaced metal, and for any sign of water at a seam. A photograph taken before the storm is the strongest record you can hold.
The storm checklist is set out in the roof damage guide for Sandy, Isaias and Ida. This calendar only sets out when to do it.
What should you do in autumn before the freeze?
Autumn is the time to clear gutters and drains, check flashing and seal small gaps before freezing weather. The freeze window opens around late October, and Sandy arrived in late October 2012, so the autumn check should be done before the first hard cold.
Clear gutters and downspouts once the leaves have fallen. A blocked gutter holds water against the fascia, and water that freezes in a gutter can pull it from the wall. Make sure downspouts carry water away from the foundation and that they are firmly attached.
On a flat roof, clear the drains and check that the slope still carries water toward them. Standing water that freezes becomes a load and widens any gap at the seams. Check the parapet coping for open joints and seal them where you can, following a technician's advice.
Autumn is also when the first heavy rains of the cold months tend to come, including nor'easter-type systems. That is background rather than a sourced date. Check the ridge, edges and flashing before the first big rain, and look at the eaves of a pitched roof for any sign of ice damage from the year before.
What does winter need?
Winter needs a check after snow and ice rather than a routine climb onto the roof. Remove heavy snow from flat roofs when it is safe, watch for ice at the eaves, and check drains after each thaw. Do not climb onto an icy roof.
The early-January normal low in Newark sits in the mid-20s Fahrenheit in the National Weather Service normals, so freezing is a regular condition rather than an exception. Ice forms where water is held: at the eaves, in valleys and on flat surfaces with blocked drains.
After a heavy snowfall, look at the roof from the ground. Snow can build where drains are blocked, and a parapet can carry a line of snow along its edge. Remove snow only where it is safe, and call a technician if you see sagging, cracks or water coming through the ceiling.
After each thaw, check the drains and gutters for ice blockage, the ceilings for new stains and the attic for damp insulation. The NWS normals record a single-day snowfall of 15.1 inches at Newark on February 1, 2021, a reminder that a heavy winter can build quickly.
What is the right order for a full seasonal check?
Work from the ground up to the top floor, then into the attic, and only then onto the roof. That order catches the obvious faults first, and it keeps time on the roof surface for dry weather when the surface is safe to walk on.
Start on the pavement with a phone camera and binoculars. Look at the ridge, the edges and the chimney, then walk the perimeter and check the gutters, the downspouts and the wall where the roof meets the building. Record anything that has changed since the last check, using the same viewpoints if you have photographs from before.
Move inside to the top floor. Check the ceilings and walls near the outside edges, the corners and the windows, looking for stains, bubbling paint or soft plaster. A stain beside an outside wall often points to the parapet or the flashing rather than the surface, so note its position carefully.
Finish in the attic if you can reach it safely. Look at the underside of the deck, the rafters and the insulation for darkening, dampness or daylight showing through. Go onto the roof only in dry weather, and do not walk a flat roof's edge or a steep slope alone.
What does a technician check that a calendar cannot?
A technician can test the flashing, the deck, the seams and the drains in ways a check from the ground cannot. The calendar tells you when to look, while a visit tells you what is wrong and what repair it needs. The scope is then confirmed in writing.
A visit includes close work on the roof surface, probing soft areas of the deck, checking how coverings are fastened and the condition of sealant at each penetration. It also includes checking drainage on a flat roof and the valleys on a pitched one, where water collects and moves most.
A technician also reads the building as a whole. Ventilation, the condition of the gutters and the way water leaves the roof and reaches the ground all bear on the roof's life. A technician can connect a stain in the attic with a clogged drain or a loose downspout, which a check from the ground often misses.
Ask for the findings in writing with photographs, and ask for each item to be ranked. A ranked list lets you decide what to repair now, what to watch and what can wait for the next seasonal check, and it gives you a baseline for next year's calendar.
Frequently asked questions
When should I book a roof inspection?
Spring and autumn are the natural points in the calendar, and a check after any major storm is worth doing too. The calendar sets the timing, and a technician confirms the scope on a visit.
Is there a best month to replace a roof?
Research for this site did not establish a preferred month, so none is given. Ask a technician about timing for the specific roof.
How often should gutters be cleared?
Check them at least in spring and autumn, and after any storm. Heavy leaf fall or a nearby tree may call for more frequent checks.
What if I see a leak in winter?
Note where it is, catch the water safely, photograph it and call a technician. Do not climb onto an icy roof to look.
Does the calendar replace a professional inspection?
No. It tells you when to look. A roof inspection by a technician finds what a check from the ground cannot.
This guide is general information for Essex County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.