Seasonal Advice
Snow and Ice on Your Roof: Safe Checks for Dublin and Wicklow Homes
What snow and ice can do to roofs, gutters and attics in Dublin and Wicklow, what to check safely from the ground and indoors, and when to call a roofer.
Heavy snow is not an every-year event in Dublin, which is exactly why it catches homes out. When a cold snap does arrive, we get calls about the same things: gutters pulled down by ice, drips through bedroom ceilings as the thaw starts, and frozen pipes in the attic.
Met Éireann's Climate of Ireland page notes that snow is most frequent in January and February, but it is not unusual in any month from November to April. It usually lies for only a day or two, although some notable falls have stayed on the ground for 10 to 12 days. Because big snowfalls are infrequent and irregular, they cause serious disruption when they come.
Location matters too. Met Éireann explains that relatively warm winter seas can bring rain at the coast while it snows a few miles inland, and that showers fall as snow more readily on higher ground. In practice, a house in Ringsend or Bray can see sleet while homes in the Dublin Mountains foothills, Glencullen, Enniskerry, Roundwood or Blessington wake up to a proper covering. Naas and the flatter parts of North Dublin and Lucan sit somewhere in between.
This guide covers what snow and ice actually do to a roof, what you can check safely, and when to call us.
First rule: stay off the roof and off the ladder
Please do not climb onto your roof to clear snow, and do not go up a ladder to knock ice out of the gutters. Snow hides cracked slates, roof windows and edges, and ice on a ladder or the ground below it is a serious fall risk. Roof tiles and slates can also crack under foot in freezing weather.
Do not throw salt, boiling water or de-icer onto the roof either. Hot water can refreeze into thicker ice further down, and repeated freeze-thaw is what damages slates, tiles and mortar in the first place.
Everything in this guide can be done from the ground, from a window, or from inside the attic.
What snow and ice do to Irish roofs
Most Irish roofs are pitched and designed to shed rain, so a normal fall of snow sitting on a sound roof is not usually the problem. The damage tends to come from what happens around it.
| Problem | What causes it | What you might notice |
|---|---|---|
| Ice in gutters | Snow melts on the warmer roof, runs down and refreezes in the cold gutter | Sagging or tilted gutters, icicles, cracked brackets or joints |
| Thaw leaks | Meltwater backs up behind ice or drifted snow and finds gaps in flashing, valleys or slipped slates | Drips or stains appearing a day or two after the snow, not during it |
| Snow sliding off | A layer slides off in one go, often at the thaw | Damaged gutters, broken plastic porch or conservatory roofs, bent satellite dishes |
| Drifting into the roof space | Wind-blown powder snow gets past gaps at the ridge, eaves or vents | Snow lying on insulation or boxes in the attic |
| Frost damage | Water in porous or cracked tiles, slates and mortar freezes and expands | Flaking tiles, spalled slates, loose ridge mortar after the cold spell |
| Flat roof ponding | Snow and slush block outlets on extensions and garage roofs | Standing water once it melts, drips at the extension junction |
Our post on frost damage to roof tiles and gutters goes into the freeze-thaw side in more detail.
Safe checks from the ground
Once it is light, and only from a safe spot on the ground or a window, look for:
- Uneven melting. Bare patches on an otherwise white roof can point to heat escaping through gaps in attic insulation. That is worth fixing for comfort and heating bills, and it also makes ice in the gutters more likely.
- Gutters pulling away. A gutter that has dropped at one end, or is bowing between brackets, is carrying too much ice. Keep people, pets and cars away from underneath it.
- Large icicles. These form where meltwater runs over a blocked or overflowing gutter. Do not stand under them or try to knock them down from a ladder.
- Snow overhanging the edge. A heavy cornice of snow at the eaves can drop without warning, especially over a front door, porch or path.
- Displaced slates or ridge tiles. These are often easier to spot as dark lines in the snow.
- Blocked flat roof outlets. From an upstairs window, check whether slush is draining away from extension and garage roofs.
Take photos as you go. They are useful if you need a repair later, and for any insurance claim.
Checks inside the attic
If you can get into the attic safely, with good light and boards to stand on, have a look during and after the snow:
- Look for snow. Small drifts on the insulation near the eaves or under the ridge mean wind-blown snow is getting in. Clear it out in a bucket before it melts into the ceiling.
- Check the underside of the roof. Wet timber, drips from nails or damp patches on the felt or membrane point to a leak or heavy condensation.
- Check the water tank and pipes. Uisce Éireann's winter advice is to lag exposed pipes and water tanks, and to know where your stop valve is so you can turn off the water quickly in an emergency.
- Check vents and eaves. Insulation pushed hard into the eaves can block airflow and lead to condensation, which can look a lot like a leak in cold weather. Our attic condensation guide explains the difference.
When the thaw starts
The thaw is when most snow-related leaks show up. Keep an eye on:
- ceilings under valleys, chimneys, roof windows and dormers;
- walls below gutters, where overflowing meltwater can soak the brickwork or render;
- the junction where an extension roof meets the house wall;
- downpipes that are still frozen while the gutters above them overflow.
If water is coming through, put a bucket under the drip, move valuables and electrics away, and if a ceiling is bulging, keep people out of the room. Switch off electrics in the area if water is near light fittings. Then call us.
Power lines, trees and ice
Snow and ice add weight to overhead lines and tree branches, and Dublin and Wicklow have plenty of both near rooflines. If a line or cable is down, or a branch has brought one onto your roof or garden, keep well clear and contact ESB Networks on their 24/7 emergency line. Do not try to clear branches off a roof yourself.
Before the next cold snap
A little preparation in November makes snow far less likely to turn into a repair bill:
- Get gutters and downpipes cleared so meltwater has somewhere to go. Leaves left in the gutter freeze into a solid block.
- Have loose or slipped slates and ridge tiles fixed before snow and frost get under them.
- Check gutter brackets and joints. Sagging or cracked brackets will not cope with the weight of ice.
- Check flat roof outlets on extensions and garages.
- Look at attic insulation and tank lagging so the roof space stays cold and the pipes stay warm.
- Keep an eye on Met Éireann warnings so you know when snow and ice are on the way.
Our autumn roof and gutter preparation guide has a fuller pre-winter checklist.
Need a roofer after snow or ice?
We repair snow and ice damage across Dublin City, North Dublin, South Dublin, Lucan, Bray, Wicklow, Naas and nearby areas, from cracked gutters and slipped slates to thaw leaks around chimneys, valleys and roof windows. Send us a few photos from the ground or the attic and we can tell you what looks urgent and what can wait until the weather settles.
Contact us by WhatsApp, call 083 066 3462, or email hi@perfectroofing.ie.
Need a roofer to take a look?
Send a few photos on WhatsApp, email us, or tap the number to call. We cover Dublin City, North Dublin, South Dublin, Lucan, Bray, Wicklow, Naas, and nearby locations.
