Felt roofing remains a popular and cost-effective solution for flat roofs, extensions, garages, and outbuildings across the UK. While modern felt roofing systems are much more durable than their older counterparts, they are still susceptible to wear and tear over time—especially when exposed to harsh weather conditions. At MCM Roofing Repairs Stockbridge in Stockbridge, Hampshire, we frequently help homeowners and landlords diagnose and resolve common issues with felt roofs before they escalate into more serious problems.
Common Felt Roof Problems and How to Fix Them
1. Blistering and Bubbling
What it is: Raised areas or bubbles forming beneath the felt membrane, often due to trapped air or moisture.
What causes it:
- Poor installation technique
- Moisture trapped between layers during application
- Heat build-up causing expansion
Solution:
Small, isolated blisters that are not leaking may not need immediate attention. However, larger or widespread blistering can rupture and allow water in. In these cases, a professional should cut out the affected section, remove moisture, and re-apply fresh felt with correct bonding techniques.
2. Cracking and Splitting
What it is: Visible cracks or splits in the surface of the felt, especially near seams or edges.
What causes it:
- UV exposure over time degrading the material
- Structural movement or flexing of the roof deck
- Natural ageing
Solution:
Cracks and splits should be repaired as soon as possible to prevent water ingress. This typically involves applying a patch of felt with cold or hot bitumen, or installing a new surface layer if the damage is extensive.
3. Pooling Water (Ponding)
What it is: Standing water that collects on the roof after rainfall and does not drain away.
What causes it:
- Inadequate roof gradient or sagging in the structure
- Blocked or poorly designed drainage
- Settling or deflection in older flat roofs
Solution:
Small areas of pooling may be addressed by improving drainage or applying a tapered overlay. In more severe cases, roof re-levelling or a full replacement may be needed to restore proper fall and prevent future water damage.
4. Loose or Lifting Edges
What it is: Edges of the felt pulling away from the roofline or upstands.
What causes it:
- Poor initial adhesion
- Weather damage and wind uplift
- Ageing adhesives losing grip
Solution:
Loose sections should be securely refixed using bitumen adhesive or mechanical fasteners. If left unattended, they can lead to wind-driven rain entering the roof structure or the felt membrane tearing further.
5. Moss and Algae Growth
What it is: Organic growth on the roof surface, particularly in shaded or damp areas.
What causes it:
- Poor drainage or moisture retention
- Lack of sunlight and ventilation
- Organic debris settling and creating a growth base
Solution:
Remove moss and algae using a gentle wash and apply a fungicidal treatment. In cases where the growth has damaged the felt or caused it to degrade prematurely, a partial re-covering may be necessary.
Preventative Maintenance Tips
To extend the lifespan of your felt roof and reduce the risk of issues, we recommend the following:
- Annual roof inspections—particularly after winter or severe weather
- Clearing debris from the roof and gutters to promote drainage
- Checking joints and edges for early signs of lifting or deterioration
- Repairing small faults promptly to prevent larger-scale damage
Routine maintenance and early intervention can add years to the life of a felt roof and reduce the cost of repairs in the long run.
When to Consider Replacement
If your felt roof is more than 15–20 years old or has recurring problems despite multiple repairs, it may be time to consider a full replacement. Modern felt systems, often reinforced with fibreglass or polyester, offer improved performance and a longer service life when installed professionally.
At MCM Roofing Repairs Stockbridge in Stockbridge, Hampshire, we offer honest assessments and tailored advice—whether you need a small repair, a full re-felt, or an upgrade to a more robust flat roofing system.
Conclusion
Felt roofing is reliable and cost-effective, but like any roofing system, it requires proper care and attention. By understanding common issues and acting quickly when problems arise, you can protect your property from leaks and avoid unnecessary expense.
If you’ve noticed signs of blistering, cracking, or water pooling on your felt roof, contact MCM Roofing Repairs Stockbridge today. Our expert team is ready to assess your roof and provide long-lasting, high-quality solutions you can trust.
Call us on: 01794 337 497
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