A Comprehensive Guide to Flat Roof Repairs

flat roof repairs
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Does your flat roof show signs of damage? If so, there is no time to waste hiring professional roofers to inspect the damage and make the necessary repairs.

After locating the source of the problem, roofing experts decide on the best way to treat the damage. They use different repair materials and techniques for gaps, cracks, and punctures of varying sizes. There is a wide range of roofing companies in Dublin, such as https://activeroofing.ie/roofing-services-dublin/flat-roof-repairs/, specializing in flat roof repairs.

We hope the following guide introduces you to such repairs.

Locating damage

The initial step of a flat roof repair is locating the damage, usually referring to detecting the source of a leak. The detection of leaks can be tricky, as the source doesn’t usually comply with the signs of water damage inside the house. Nevertheless, professional roofers are experts at identifying the source shortly after inspecting the discolourations on the interior walls and sensing the damp smell.

The following step involves climbing on the roof to inspect the leaking area, as it’s the only way to discover the water path. Roofing professionals use safety equipment when climbing on top of the structure, which is essential, especially during the winter period. These professionals check the slope of these roofs, as they aren’t ideally flat, in order to check the way in which water is driven off the sides.

Once up there, roofing contractors inspect the structure for cracks, tears, and punctures. Even the smallest spots should be patched before they turn into more serious issues. Once water is allowed to penetrate the structure through a spot, the wooden framework found below will start rotting.

Apart from checking for holes and cracks, roofers also inspect the seams for signs of leakage. If the membrane shows no symptoms of leaking, these professionals will move on to check the condition of the edges. Water is capable of finding its way between a roof and vents, chimneys, or walls. Check out these different types of flat roof materials.

Following the detection of the damaged area, roofers ensure the area is cleaned up before starting the repairs. Unless the area is left with no debris, there is a high risk for dirt and gravel to impede the repair material from getting attached to the structure. Besides cleaning the area up, roofing contractors make sure it’s dry before treating it with sealant and cement. They either use paper towels a propane torch for this task.

Repairing small holes and cracks

When repairing tiny cracks and holes, professional roofers use a utility knife to cut the blistered spots open. These blisters appear on flat roofs either due to moisture getting trapped or overheating. In any case, the surface under the blister should be dry before patching the hole up. Small holes are usually repaired by filling them up with sealant.

For instance, caulk is used for sealing cracks and holes whose diameter is no larger than one inch. Additionally, professional roofers use cement to waterproof gaps of different sizes, as this material takes the role of an adhesive. When waterproofing the damaged area, roofing experts use fiberglass mesh on top of the cement. The mesh is then covered with another layer of cement, which is supposed to cover it completely.

The ultimate step of the process is adding a layer of gravel whose function is to impede sun damage. This layer of rocks has the potential to absorb UV rays and prevent the sun from deteriorating the membrane bonds. If requested by clients, roofers can apply reflective coating on the roof surface, which increases the reflection of sun rays.

Roof patches

When dealing with larger areas of damage, patches are considered the best treatment methods. The patch is supposed to match the type of roofing material. Roofers cut the damaged spot out, making sure the cut is deep enough to remove the deteriorated material. The hole is then filled with cement, which is supposed to be waterproof. Caulk isn’t the best choice of sealant when it comes to patches, as it lacks the same adhesive properties as cement.

Once the hole is filled with cement, roofing professionals set the patch on top of it. As soon as it’s fitted in the right place, they press it hard enough to stick. Another coat of roofing cement is spread over it. Roofers place another patch for better water resistance, which should be six inches bigger in length and width than the deteriorated area. The second patch is likely to be more visible than the first one. It should be covered with a last coat of cement, no thicker than half an inch.


Resealing is another type of service provided by flat roof repairmen. After making sure the entire surface is clean, they coat it with a thin primer layer of bitumen-based primer, applied with a paint roller. The primer is supposed to dry for a minimum of half an hour on hot days, whereas as many as several hours on cool days.

Once the primer is dry, roofing professionals cover the surface with fiberglass mesh, which is available in large rolls. They use a bitumen roof sealant to paint onto the structure by working in one direction. Roofers use special brushes with soft bristles during the application process. They calculate the amount of sealant and mesh before the project starts and include the cost in the estimate.

Following twelve hours, the second layer of sealant should be applied after the first coat was left enough time to get dry. After the application of the first layer, there are tiny holes visible on the surface. Nevertheless, these are filled in with the second coating. Finally, roofers use a clean roller to apply a layer of a reflective coating. It gets dry in about eight hours in warm weather, while as long as twenty-four hours in humid conditions.

To sum up

Make sure to hire roofing experts who offer high-quality, efficient and affordable services!