FLAT ROOFS: TORCH ON MINERAL FELT

Understanding Mineral-Felt Roofs
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Mineral-felt roofs have been a staple in the roofing industry for decades, particularly in the UK. Known for their affordability and ease of installation, these roofs are commonly found on flat or low-pitched structures such as garages, extensions, and garden sheds. But what exactly is a mineral-felt roof, and why has it remained a popular choice?
What is Mineral Felt?
Mineral felt is a type of roofing material made from bitumen, a sticky, black, and highly viscous liquid or semi-solid form of petroleum. The bitumen is reinforced with a base material, usually fibreglass or polyester, and then coated with a layer of mineral granules. These granules provide additional protection against UV rays and weathering, extending the lifespan of the roof.
Types of Mineral Felt
There are several types of mineral felt available, each with its own set of characteristics:
Traditional Felt: Made from organic materials like paper or wood fibre, this type is less durable and more susceptible to weather damage.
Fibreglass Felt: Reinforced with fibreglass, this type offers better durability and resistance to tearing.
Polyester Felt: Known for its high tensile strength, polyester felt is the most durable and long-lasting option.
The Pros of Mineral Felt Roofs
Affordability
One of the most significant advantages of mineral felt roofs is their cost-effectiveness. Compared to other roofing materials like slate, tile, or metal, mineral felt is relatively inexpensive. This makes it an attractive option for homeowners on a budget or for secondary structures like sheds and garages.
Ease of Installation
Mineral-felt roofs are relatively easy to install, even for those with limited DIY experience. The material is lightweight and can be cut to size with a utility knife. Additionally, the installation process does not require specialised tools or equipment, making it a straightforward project for most homeowners.
Flexibility
Mineral felt is highly flexible, allowing it to conform to various roof shapes and sizes. This makes it an ideal choice for flat or low-pitched roofs, where other materials might struggle to provide adequate coverage.
Weather Resistance
When properly installed, mineral-felt roofs offer excellent resistance to the elements. The bitumen layer provides a waterproof barrier, while the mineral granules protect against UV rays and weathering. This combination helps to extend the lifespan of the roof, making it a durable option for many homeowners.
Low Maintenance
Mineral-felt roofs require minimal maintenance compared to other roofing materials. Regular inspections and occasional repairs can help to prolong the life of the roof, but overall, the maintenance requirements are relatively low.
The Cons of Mineral Felt Roofs
Limited Lifespan
One of the main drawbacks of mineral felt roofs is their limited lifespan. While more durable options like fibreglass or polyester felt can last up to 20 years, traditional felt roofs may only last 10-15 years. This means that homeowners may need to replace their roofs more frequently compared to other materials like tile or metal.
Susceptibility to Damage
Mineral-felt roofs are more susceptible to damage from physical impacts, such as falling branches or hail. The material can also be prone to tearing or puncturing, particularly if it is not properly installed or maintained.
Aesthetic Limitations
While mineral-felt roofs are functional and cost-effective, they may not be the most aesthetically pleasing option. The material has a utilitarian appearance that may not complement the overall design of some homes. For homeowners looking to enhance their property’s curb appeal, other roofing materials like slate or tile may be more suitable.
Environmental Concerns
Mineral felt is made from bitumen, a petroleum-based product. This raises environmental concerns, as the production and disposal of bitumen can contribute to pollution and greenhouse gas emissions. Additionally, mineral-felt roofs are not easily recyclable, which can further impact the environment.
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