Asphalt flat roofs have been a famous choice for domestic and industrial buildings because of their stability, budget-friendliness, and superior waterproofing properties. These roof systems consist of multiple asphalt-based layers, such as modified bitumen or built-up roofing (BUR), offering stability, weather resistance, and insulation. If you are considering installing or maintaining an asphalt flat roof, it is essential to understand its structure, benefits, frequent issues, and how to keep it in ideal condition. This informative blog will provide a deep insight into asphalt flat roofs.
What Is An Asphalt Roof?
Asphalt flat roofs are developed using a slight pitch—generally between 1 to 10 degrees—to enable water drainage. These roofs are normally built using asphalt modified with materials such as rubber or plastic to improve adaptability and stability. With the passage of time, exposure to the sun’s UV rays, atmospheric conditions, and general wear and tear may degrade the asphalt layer, resulting in possible issues including:
- Cracks
- Blisters
- Leaks
In contrast to sloped roofs, which enable rainwater to run off rapidly, flat roofs are more prone to water pooling. This may cause structural damage if not appropriately managed. The waterproofing layer in an asphalt flat roof is vital in avoiding moisture infiltration, making routine maintenance a major factor in extending the roof’s service life.
The Evolution of Asphalt in Roofing
Historically, asphalt roofing has remained approximately the same, with the principal innovation being the introduction of modified asphalt. Both mastic asphalt and its modified versions offer excellent waterproofing abilities; because of that, mastic asphalt is usually referred to as ‘The King of Waterproofing.’
One key advantage of modified asphalt is its capability to adapt to different temperatures and conditions, making it a dependable roofing material. These advancements have contributed to asphalt’s long-lasting popularity in the roofing sector.
Common Problems with Asphalt Flat Roofs
Blisters and Cracks
Blisters are pockets of trapped air or moisture under the asphalt surface. After a while, these blisters may crack, resulting in leaks. If an asphalt roofing contractor detects cracked blisters during an inspection, swift repairs are necessary to avoid additional damage.
Pooling Water
Owing to the nature of flat roofs, inadequate drainage may result in pooling water, which weakens the asphalt with the passage of time. Routine inspections and adequate drainage systems can alleviate this problem.
Cold Shock Cracking
This rare phenomenon takes place when there is a severe drop in temperature, causing an asphalt roof—particularly one not protected by solar reflective paint—to crack. Such cracks generally extend over the whole roof and are easy to detect and repair.
Slumping
Slumping occurs when elevated temperatures cause the asphalt to soften and lose its form, specifically around flashings and upstands. This can create openings for water infiltration. UV solar reflective paint must be applied and maintained routinely to avoid slumping.
Impact Damage
Impact damage appears as curved or half-moon-shaped indentations on the roof area. Unless the asphalt has been split, the roof’s integrity remains sound, and basic repairs can restore its condition.
How to Repair an Asphalt Roof?
Detecting Problematic Areas
Before performing repairs, it is vital to evaluate the roof for visible issues like cracks, blisters, leaks, and pooling water.
Cleaning the Roof
To guarantee proper adhesion of repair materials:
- Eliminate debris by utilising a broom or blower.
- Utilise a pressure washer on a low setting to clean the surface.
- Enable the roof to dry totally before applying repairs.
Fixing Small Cracks and Blisters
- Cut open blisters cautiously to release trapped air or moisture.
- Apply roofing cement beneath the flap and press it down.
- Strengthen it with fibreglass roofing mesh and cover it with an additional layer of roofing cement.
- For small cracks, fill them with roofing cement and level the surface.
Repairing Larger Damage
- Cut out and remove the damaged part of asphalt.
- Clean and dry the uncoated area meticulously.
- Install a new asphalt patch, guaranteeing a 2-inch overlap on each side.
- Seal the edges with roofing cement and strengthen with fibreglass mesh.
Preventive Maintenance for Longevity
For a longer shelf life of your asphalt flat roof, consider the following maintenance tips:
Routine Inspections: Check your roof at least twice a year, particularly after extreme weather.
Debris Removal: Keep the roof surface immaculate to avoid retention of moisture.
Improving Drainage: If water pooling is found, upgrade drainage systems or adjust the roof’s pitch.
Applying a Roof Coating: Use UV solar reflective paint to safeguard against heat and avoid slumping.
Inspecting Vent Pipe Collars: Guarantee mastic asphalt collars around soil vent pipes are intact to avoid leaks.
Additional Factors That Impact the Longevity of Asphalt Flat Roofs
To guarantee your asphalt flat roof lasts to the greatest extent possible, keep an eye on these structural and maintenance factors:
Coping Stones
Flat roofs usually have coping stones at the perimeter. If no damp-proof course is beneath, moisture may seep in, causing the mortar to deteriorate. Installing a damp-proof course below coping stones aids in avoiding humidity damage.
Cracked Rendering
Water infiltration through cracks in wall rendering may travel underneath the asphalt, resulting in leaks. Consult an expert to resolve any rendering cracks immediately.
Lead Flashings
Failing lead flashings may enable water to seep behind the roofing system. Routine inspections and repairs of lead flashing help avoid unnecessary leaks.
Air Handling Units
Flat roofs with HVAC systems or plant machinery might suffer asphalt damage from accidental oil spills. To mitigate deterioration, inform repair specialists to avoid oil contact with asphalt surfaces.
Sun Damage
Prolonged sun exposure pulls bitumen from asphalt, resulting in surface wear and slumping. Applying solar reflective paint aids in safeguarding against UV damage. Reapply every 3-5 years for the greatest possible effectiveness.
When to Call a Professional?
While householders can handle basic repairs, substantial damage must be addressed by experts. If you are unsure about your roof’s condition, hiring a seasoned asphalt roofing contractor can help you avoid expensive repairs in the long term.
To Conclude!
Asphalt flat roofs are a dependable and economical option for property owners. Nevertheless, routine maintenance and timely repairs are necessary to avoid lasting damage. By comprehending the frequent issues connected with asphalt flat roofs and taking preventive control measures, you can guarantee that your roof will remain stable and weather-proof for many years.
Whether you are dealing with blisters, cracks, or pooling water, swiftly resolving these issues will help retain the integrity of your asphalt flat roof. When in doubt, consulting a professional like Surrey Roofing Specialists guarantees that your roof remains in optimal condition for the long run.