With over 20 years of experience in the roofing trade, I’ve seen just about everything the inclement British weather can throw at a roof, especially flat felt roofs. As we move into the colder months, I want to talk about the types of damage cold winter weather can cause to flat felt roofs and why it’s important to take action sooner rather than later.
Understanding Flat Felt Roofs
Flat felt roofs are a popular choice for many homes and commercial buildings across Guildford and the surrounding areas. They’re commonly used for garages, extensions, and outbuildings because they’re cost-effective, durable, and relatively straightforward to install. However, their flat design makes them particularly susceptible to winter damage compared to pitched roofs.
The Challenges of Flat Roof Design
The very nature of a flat roof means that water drainage can be an issue. Unlike a pitched roof, which allows water and snow to slide off easily, flat roofs can hold water for longer periods. This standing water, combined with freezing temperatures, creates the perfect storm for winter-related damage.
Common Types of Winter Damage to Flat Felt Roofs
1. Freeze-Thaw Cycle
One of the most common issues I encounter is damage caused by the freeze-thaw cycle. When water collects on the roof and temperatures drop, the water freezes and expands. This puts pressure on the felt layers, leading to cracks, splits, and delamination. When the ice melts, the water seeps into these cracks, only to freeze and expand again. Over time, this cycle can cause significant damage to the roof’s structure.
2. Ponding Water
Flat roofs are particularly vulnerable to ponding water—pools of water that don’t drain away. In winter, these pools can freeze, adding considerable weight to the roof. This not only strains the structure but also accelerates the breakdown of the roofing material. Over time, the protective top layer of felt can degrade, leaving the roof prone to leaks.
3. Snow and Ice Buildup
Heavy snowfalls, though less frequent in our part of the UK, can still cause problems. Snow can build up on flat roofs, and if it’s not cleared, it can compact into ice. This extra weight can lead to structural stress and even roof collapse in extreme cases. Additionally, as the snow melts, the resulting water can exacerbate drainage issues.
4. Blocked Drains and Gutters
Winter leaves, combined with ice and snow, can clog drains and gutters, preventing water from escaping the roof. Blocked drainage systems lead to water pooling on the surface, increasing the risk of leaks and water ingress. In some cases, this water can freeze, further damaging the roof’s material.
5. UV Damage Exacerbated by Winter Conditions
It’s not just the cold that’s a problem. During clear winter days, UV rays can still degrade the roof’s felt surface. This issue is often overlooked, but over time, the combination of UV exposure and freezing conditions can weaken the roof’s integrity.
Preventing Winter Damage to Flat Felt Roofs
1. Regular Inspections
One of the best ways to prevent winter damage is through regular roof inspections. Before the cold weather sets in, check your flat roof for signs of wear and tear, such as cracks, blisters, or loose felt. Spotting these issues early can save you a lot of money and hassle down the line.
2. Clear Gutters and Drains
Ensure your gutters and drainage outlets are clear of debris before winter arrives. This will help prevent water from pooling on the roof and reduce the risk of ice dams forming.
3. Address Ponding Water
If your flat roof has areas where water tends to pool, it’s worth addressing this before winter. Installing additional drainage points or correcting the roof’s pitch can help prevent water from collecting and freezing.
4. Remove Snow Safely
In the event of heavy snowfall, consider removing excess snow from your flat roof. However, this should be done carefully to avoid damaging the roofing material. If in doubt, call a professional to handle the job safely.
5. Apply Protective Coatings
There are protective coatings available that can extend the life of your flat felt roof and provide an extra layer of defence against the elements. These coatings are particularly effective at preventing water penetration and UV damage.
When to Call a Professional
While some maintenance tasks can be done yourself, there are times when it’s best to call in a professional. If you notice signs of damage, such as water leaks, damp patches on ceilings, or visible cracks in the felt, don’t wait for the problem to get worse. Acting quickly can prevent more extensive and costly repairs later.
My Experience with Winter Roof Repairs
Over the years, I’ve repaired countless flat felt roofs in Guildford and the surrounding areas. Each job is unique, but the underlying causes of winter damage are often the same. Whether it’s patching up a split caused by the freeze-thaw cycle or replacing sections of felt that have worn away, I’ve seen how even a small issue can escalate if left untreated.
One memorable job involved a garage roof where ponding water had frozen solid, causing significant cracking in the felt. The homeowner initially thought it was a minor issue, but by the time they called me, the water had seeped into the roof’s timber structure, leading to rot. It was a reminder of how important it is to act quickly when you spot a problem.
If you’re a homeowner in Guildford or the surrounding areas, don’t let winter take its toll on your flat felt roof. With over 20 years of experience, I’m here to help you protect your property and avoid costly repairs.
Whether you need a roof inspection, preventative maintenance, or emergency repairs, get in touch with me today. Together, we can ensure your roof is ready to withstand whatever winter has in store.
Call me, Billy on 01483 677193 or visit our Guildford roofing repair page to arrange your appointment. Don’t wait until it’s too late—let’s keep your roof in top condition this winter and beyond.