Every type of roof system has its advantages and limitations. Membrane roofing is durable and highly waterproof but can experience issues such as blistering, although it can happen with other roofing systems too. It occurs on the surface as gaps form underneath the membrane or between layers thanks to a loss of adhesion. However, roof blistering shouldn’t be ignored as the problems may not be purely aesthetic.

Here’s everything you need to know about why your flat roof is blistering.

What Causes Blistering on Flat Roofs?

Blistering usually occurs with changes to the weather, causing roofing materials to expand and contract. If there’s any loss of adhesion, this can form ‘blisters’ which consist of bubbles filled with moisture or air. Another similar issue some roofs experience is alligatoring, but this is usually a sign of an ageing roof as UV rays damage it, causing cracks to appear across the affected area.

Does your flat roof need repairs? Discover the causes of roof blistering & alligatoring. What problems can these roof issue cause? How professional roof repairs can help. Prevent blistering with expert roofing advice.Is It a Problem?

Sometimes blistering can become a more significant issue if left unresolved. One of the main problems is when the blisters get bigger or crack, which can cause higher amounts of moisture to work its way into the roofing system one way or another. It could also affect the roof’s ventilation.

The first thing to do if you see blistering on your roof is to book an inspection, providing a proper assessment of any roofing issues. A professional roofer can have a look at the problem and confirm if repairs are required or if it’s a ‘keep a close eye on it’ situation.

Can You Prevent It?

If your flat roof is old, it can be difficult to prevent further blistering, but you could try covering it when it’s not in use or during more extreme weather. However, ask a roofer to assess whether a roof replacement will help reduce your costs if repairs are ongoing. Modern flat roofing systems are highly waterproof, so if you’re in an area where blistering is a common occurrence, a reliable roofing company may be able to recommend roofing solutions which are fully bonded and won’t blister easily. It’s vital that the flat roof is installed to a high standard, so always check out their credentials before hiring them.

How to Repair Roof Blistering

Repairs to roof blistering are often required if it’s causing any deterioration or damage to the surface material or membrane, or it’s obvious the problem is worsening. Repairs will usually be needed in flat roofs which double as an area which supports traffic, such as a balcony or raised outdoor seating area. Roofers will use expert techniques to repair the material, including cutting away and replacing the affected area or replacing the membrane entirely.

Do you need roof repairs?

South Thames Roofing is a professional roofing company near South London and Surrey, attending properties in areas such as Ashtead, Wandsworth and Knightsbridge. Contact us now for a free, no-obligation quote.